JPH0680791B2 - Hybrid integrated circuit device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to erasing by mounting a chip-type non-volatile memory, for example, EPROM (UV erasable programmable read only memory) on an integrated circuit substrate. , Writable and rewritable EPROM embedded hybrid integrated circuit device.

(B) Prior Art Recently, electronic devices using microcomputers have been used in various fields such as electronics, aviation, machinery and automobiles. The background is that a multifunctional operation can be easily realized by using a microcomputer. The amount of program data that determines its operation tends to increase year by year as electronic devices become multifunctional. Furthermore, the program data for operating the microcomputer is not always constant from the design of the electronic device, and there may actually be several or tens of program design changes until the electronic device is completed.

As described above, in the electronic equipment field, there is a tendency that integrated circuits with EPROMs are increasingly required.

EPRO with a UV irradiation window that can erase and rewrite the stored information by irradiating it with UV light
The M element is preferably used in various electronic devices. This E
Most of PROM elements are currently mounted on a printed wiring board together with an integrated circuit for control or driving. In order to rewrite information once written, it is usually mounted on a printed wiring board that is easily removable. ing. For various electronic devices that are required to be smaller and lighter, a semiconductor integrated circuit (IC) is mounted on the printed wiring board by a technique called chip-on-board.
The chip is directly mounted, and after the required wiring is provided, the IC chip including this wiring portion is covered with a synthetic resin, and the size and weight are extremely reduced.

On the other hand, EPROM chips that require an ultraviolet irradiation window cannot be reduced in size and weight because the irradiation window becomes a neck and is still manufactured by being assembled in a sardip type package and mounted on a printed wiring board.

A mounting structure of such a conventional EPROM element will be described with reference to FIG. 14. FIG. 14 is a perspective view having a partial cross section of the conventional EPROM element, in which a conductive wiring pattern (4
An EPROM element (44) is mounted in a sardip type package in a through hole (43) of an insulating substrate (42) made of glass epoxy resin or the like on which 1) is formed. This EPROM element (44) has a header (45) and a cap (46), and the header (45) is bonded to a ceramic base material (47) from an external lead (48) with a low melting point glass material. Further, in this header (45), an element mounting portion (50) obtained by sintering a so-called gold paste in which a large amount of gold powder is mixed with glass is adhered onto the low melting point glass material or the ceramic base material (47), This element mounting part (5
The EPROM chip (51) is mounted on the surface (0) with the ultraviolet irradiation surface facing upward, and the electrode of the chip (51) and the external lead (48) are connected by a thin metal wire (52). The cap (46) is a storage member, and includes a ceramic base material (54) having a window (53) in a portion facing the ultraviolet irradiation surface of the EPROM chip (51), and the cap (46) has a low melting point. EPRO placed in header (45) by glass
The M tip (51) is sealed. The EPROM element (44) thus sealed with the EPROM chip (51) is fixed by solder by inserting the external lead (48) into the through hole (43) of the insulating substrate (42). The through hole (43) is laid out as required by the conductive wiring pattern (41), and the male connector terminal (55) provided at the end of the insulating substrate is transferred to a female connector (not shown). Connected with.

Now, the packaging structure of such a conventional EPROM element has an extremely large package outer shape as compared with the EPROM chip (51), and is three-dimensional, that is, the height is several times as high as the height of the chip as well as the plane occupancy rate. It is extremely disadvantageous. Furthermore, it is necessary to fix the lead-out lead through the through-hole (43) with solder or the like. A further major drawback to be noted is that the EPROM device is once assembled into a package prior to mounting on an insulating substrate. Since the EPROM element has a window for UV irradiation, the package is assembled into a cerdip type package that uses ceramics as a base material. However, this package is sealed with a low melting point glass, so it can be used at high temperatures (400 to 500). If the metal thin wire that connects the electrode (aluminum) of the EPROM chip and the external lead is not made of the same kind of material, alloying occurs and wiring resistance increases or disconnection occurs. In order to avoid such a situation, aluminum thin wires are usually used, but this EPROM chip requires a substrate to be at ground potential, so the ground electrode of the EPROM chip is wire-connected to the chip mounting part made of gold paste. . Even in this case, since the secondary or multi-component alloy reaction proceeds between the metal such as gold or foil in the gold paste and the aluminum, a silicon piece having aluminum coated on the head called a ground die is used. Separately from the EPROM chip, fix it to the chip mounting part made of the gold paste, and
The conventional mounting structure is unsatisfactory in terms of small size, light weight, and low price, such as the extremely complicated work of connecting to the ground electrode of the EPROM chip.

There is an EPROM mounting structure shown in FIG. 15 to solve such a problem.

The EPROM mounting structure shown in FIG. 15 will be described below.

An insulating substrate (60) such as a glass / epoxy resin plate with a conductive wiring pattern (60b) formed on the main surface (60a)
Area with chip (60c) to mount EPROM chip (61)
The wiring pattern (60b) is routed from near the area on the main surface (60a) and is connected to a male connector terminal portion (not shown). An EPROM chip (61) is mounted on the area (60c), and this chip (61)
The surface electrode and the wiring pattern (60b) of the metal thin wire (6
Connected by 2). Of course, one of the thin metal wires (62) is connected to the substrate of the chip (61),
The chip (61) is wired with the wiring pattern (60b) mounted thereon. On the ultraviolet irradiation surface (61a) of the EPROM chip (61), an ultraviolet transparent window material (64) is fixed via an ultraviolet transparent resin (63) (for example, Toray Co., model name TX-978). ing. The window material (64) is a known ultraviolet ray transmissive material such as quartz or transparent alumina.
Since the top surface (64a) of the window material (64) is a surface for introducing light to the ultraviolet irradiation surface of the EPROM chip (61),
The remaining window material (64) member excluding the top surface (64a),
The thin metal wire (62) and the connecting portion between the thin metal wire (62) and the wiring pattern (60b) are covered with a synthetic resin (65) (for example, model name MP-10 manufactured by Nitto Denko Corporation). if,
Insulating substrate (60), EPROM chip (61) and window material (64)
If it is necessary to further reduce the total thickness dimension including
The chip mounting area (60c) of the substrate (60) may be used as a countersunk hole to dig about half the thickness of the substrate (60). Further, if such counterbore holes are formed, a flow stop dam of the synthetic resin (65) is formed, which effectively acts on ingress of moisture and the like.

The EPROM mounting structure shown in FIG. 14 and FIG.
-83393 (HO5K 1/18).

(C) Problems to be Solved by the Invention Needless to say, the EPROM mounting structure shown in FIG. 15 is miniaturized because the EPROM chip is die-bonded onto the printed circuit board. However, the miniaturization referred to here is only miniaturization of the EPROM itself. That is, the first
Although it is not clear from Fig. 5, the microcomputer and its peripheral circuit elements fixed around the EPROM are composed of electronic components such as discretes. When the entire system is viewed, there is a problem that the size of the printed circuit board does not become small at all, that is, the size of the entire system becomes large as usual.

Further, in the EPROM mounting structure shown in FIG. 15, since the EPROM chip is die-bonded, the program data of the EPROM chip can be easily erased, but it is very difficult to write when rewriting after erasing. For example, EP
As described above, there are several or tens of design changes, that is, program and data changes until the multi-functional integrated circuit equipped with the ROM chip and the microcomputer is completed. Due to the writing work, there is a big problem that it cannot be easily dealt with at the time of design change, that is, at the time of program / data change.

Further, in the mounting structure shown in FIG. 14 as well, as in FIG. 15, the circuits around the EPROM, that is, the circuit elements such as the microcomputer and its peripheral LSI, IC are composed of discrete electronic components. However, there is a big problem that the printed circuit board becomes large in size, that is, the entire system becomes large in size, and it is impossible to provide a light, thin, short and small EPROM mounted integrated circuit which is required by the user.

Furthermore, in the EPROM mounting structure shown in FIGS. 14 and 15,
As mentioned above, the whole system becomes larger and EPROM
Also, since the conductive patterns that connect the circuit elements in the surroundings to each other are exposed, there is a problem that reliability is reduced.

Furthermore, in the EPROM mounting structure shown in FIG. 14 and FIG.
Since the OM and the circuit elements such as the microcomputer and ICs, LSIs and the like around the OM are exposed, there is a problem that unevenness is generated on the upper surface of the substrate, which makes it difficult to handle and reduces workability.

(D) Means for Solving the Problems The present invention has been made in view of the above-described problems, and includes a microcomputer equipped with a chip-type EPROM on a substrate and connected to the EPROM chip, and a peripheral thereof. It has a structure in which the circuit elements are mounted, and the microcomputer and all the circuit elements around it are hermetically sealed by the case material, and only the EPROM chip is mounted on the substrate exposed by the holes provided in the case material. And EP
Connect a plurality of switches to the conductive path on the board to arbitrarily convert between the write-only mode used for writing operation to write predetermined program data to the ROM chip and the normal-only mode used for reading data from the EPROM chip during normal operation At the same time, the conductive paths used for the write-only mode and the normal dedicated mode are formed on the substrate, and the write-only conductive path is used to generate a serial signal via the parallel / serial conversion circuit.
It is characterized by writing program data in EPROM.

Therefore, the EPROM chip can be extremely miniaturized and the EPROM chip can be easily erased.
A hybrid integrated circuit device with a built-in chip can be provided.

In addition, since there is a switch for converting to each writing / normal exclusive mode, each exclusive mode can be set by the conversion of the switch, and the exclusive external leads for exclusive use of writing that are fixed to the board in the exclusive writing mode are used. It is possible to write predetermined program data to the EPROM. Further
When writing data to the EPROM, the data can be written by a serial signal through the parallel / serial conversion circuit connected on the conductive path, so that the external lead terminal dedicated to writing can be minimized.

(E) Operation As described above, according to the present invention, the EPROM chip is connected to the conductive path on the substrate and is connected to the adjacent conductive path by the wire line, so that the EPROM chip mounting position is arbitrarily set. Because you can
In consideration of electrical connection with the built-in microcomputer, the EPROM and the microcomputer can be efficiently connected, and the signal line, that is, the lead line of the conductive path can be eliminated. Furthermore, the most closely related microcomputer can be placed in the adjacent position of the EPROM chip.
The data line that exchanges data between the chip and the microcomputer can be realized with the shortest distance or the minimum distance,
Since the loss of the mounting density due to the routing of the data lines is suppressed to the minimum, high density mounting can be performed.

Further, in the present invention, all elements other than the EPROM chip are housed in a chip-like shape and housed in a sealed space formed by a case material and a substrate. You can

Furthermore, in the present invention, since the switch for converting into the write / normally exclusive mode is provided on the substrate, the program data can be written by using the external lead dedicated to the write when the switch is performed in the write only mode. Also, since the parallel / serial conversion circuit is provided, program data can be written in the EPROM by a serial signal.

(F) Embodiment A hybrid integrated circuit device according to the present invention will be described in detail below with reference to an embodiment shown in FIGS.

1 and 2 show a hybrid integrated circuit device (1) according to an embodiment of the present invention. This hybrid integrated circuit device (1) is used as an independent electronic component and is used as an integrated circuit having a function independently in a wide range of fields such as computers.

As shown in FIGS. 1 and 2, the hybrid integrated circuit device (1) includes an integrated circuit board (2), a conductive path (3) having a desired shape formed on the integrated circuit board (2), Conductive path (3)
A non-volatile memory chip (4) connected to the microcomputer, a microcomputer (5) supplied with data from the memory chip (4) and connected to the conductive path (3) on the substrate (2), and peripheral circuit elements thereof ( 6) and a write mode and a memory chip (4) used during a write operation for writing predetermined program data to the memory chip (4)
A plurality of switches (17) for reading data from and converting between normal mode used during normal operation, a parallel / serial conversion circuit (101) for enabling writing by a serial signal, and a predetermined position integrated on the substrate (2) And a case member (8) having a hole (7).

A hard substrate made of ceramics, glass epoxy, metal, or the like is used as the integrated circuit substrate (2), and in this embodiment, a metal substrate excellent in heat dissipation and mechanical strength is used.

As the metal substrate, for example, an aluminum substrate having a thickness of 0.5 to 1.0 mm is used. As shown in FIG. 3, an aluminum oxide film (9) is formed on the surface of the substrate (2) by known anodic oxidation.
(Alumite layer) is formed, 10-70μ on one main surface side
Insulating resin layer such as thick epoxy or polyimide (10)
Is attached. Furthermore, a copper foil (11) having a thickness of 10 to 70 μm is adhered to the insulating resin layer (10) at the same time as the insulating resin layer (10) by means such as a roller or a hot press.

On the surface of the copper foil (11) provided on one main surface of the substrate (2), a conductive path of a desired shape is exposed by screen printing and masked with a resist, and a noble metal (gold, silver, platinum) plating layer is formed. The surface of the copper foil (11) is plated. Then, the resist is removed and the copper foil (11) is etched using the noble metal plating layer as a mask to form a desired conductive path (3). Here, the fineness of the conductive path (3) by screen printing is 0.5 mm.
Therefore, when a very fine wiring pattern is required, it is possible to form a very fine conductive path (3) of up to about 2 μ by the well-known photo-etching technique.

A nonvolatile memory chip (4), a microcomputer (5) to which data is supplied from the memory chip (4), a circuit element (6) around it, and a memory chip ( Write-only mode and memory chip used when writing data to 4) (4)
A plurality of switches (17) for switching the dedicated mode from the normal dedicated mode used for normal operation by reading the data from the parallel switch and a parallel / serial conversion circuit are mounted and connected to the conductive path (3). The conductive path (3) is formed to extend over substantially the entire surface of the substrate (2), and the conductive portion (3) extends to the peripheral edge of the substrate (2).
A lead fixing pad is formed at the tip of the pad, and an external lead terminal (12) is fixed to the pad. The external lead (12) is bent and formed at a substantially right angle for mounting on the mounting substrate. By the way, in the conductive path (3) formed on the substrate (2), a write-only conductive path (3) and a read-only conductive path (3) are formed to extend on the substrate (2). An external lead (12a) dedicated to writing and an external lead (1) dedicated to reading (1) are provided at the extending end portions of the respective conductive paths (3).
2b) is stuck. In addition, a parallel path for writing with a serial signal is placed on the write-only conductive path (3).
A serial conversion circuit (101) is connected. The parallel / serial conversion circuit (101) converts a serial signal into a parallel signal, and is composed of an LSI such as a microcomputer. In this embodiment, an 8051 one-chip microcomputer manufactured by Intel Corporation is used.

EPROM (Erasable as a non-volatile memory chip (4)
A programmable read only memory) chip is used (hereinafter, the nonvolatile memory chip (4) is referred to as an EPROM chip). As is well known, the EPROM chip (4) is an element that can be used by irradiating electrons (program data) accumulated in the floating gate with light to excite them and restore them to an unstored pellet to rewrite them. The EPROM chip (4) is commercially available, and its shape is not limited as long as it is a chip type. In this embodiment, the EPROM chip (4) is used.
The description of the chip (4) is omitted.

On the other hand, the case member (8) is made of a thermoplastic resin as an insulating member, and is formed in a box shape so that a space is formed when it is fixed to the substrate (2). The peripheral edge of the box-shaped case material (8) is arranged substantially at the peripheral edge of the substrate (2) and firmly fixed to the substrate (2) by an adhesive sealant (J sheet: product name). Be integrated. As a result, a predetermined sealed space (14) is formed between the substrate (2) and the case material (8). Furthermore, the case material (8) of this embodiment
A hole (7) is provided at a predetermined position. The hole (7) is formed in such a size as to expose the EPROM chip (4) and a bonding wire line connecting the EPROM chip (4) and the conductive path (3). That is, it is formed larger than the EPROM chip (4).

The EPROM chip (4) is fixedly mounted on the conductive path (3) on the substrate (2) exposed through the hole (7) of the case material (8) by a brazing material such as Ag paste or solder, and the hole (7) is used. On the exposed substrate (2), one end of a plurality of conductive paths (3) connected to the EPROM chip (4) is formed. An ultrasonic bonding connection is made between one end of the conductive path (3) and the EPROM chip (4) by a bonding wire line such as an Al wire. EPRO
Conductive path (3) bonded to M chip (4)
The other end is efficiently routed in the vicinity of the microcomputer (5) arranged to be connected to the EPROM chip (4) and ultrasonically connected to the chip-shaped microcomputer (5) and an Al bonding wire for electrical connection. Connected.

Here, the positional relationship between the EPROM chip (4) and the microcomputer (5) will be described. As shown in FIG. 1, EPROM chip (4) and microcomputer (5)
Is connected to each other via a large number of conductive paths (3), the EPROM chip (4) and the microcomputer (5) are respectively located at adjacent positions in order to shorten the routing of the conductive paths (3). Alternatively, they are arranged so that they are located as close to each other as possible. Therefore, the conductive path (3) between the EPROM chip (4) and the microcomputer (5) can be formed in the shortest distance, and the mounting area on the substrate can be effectively used. EPRO
As shown in FIG. 1, the M-chip (4) and the chip-shaped microcomputer (5) arranged in the vicinity of or adjacent to the M-chip (4) are the tips of the conductive paths (3) extending in the vicinity of the microcomputer (5). And an EPROM chip (4) are electrically connected to each other by ultrasonic bonding by an Al wire wire.

As is clear from FIGS. 1 and 2, the EPROM chip (4) is mounted on the substrate (2) exposed by the hole (7) provided in the case material (8), and the wall forming the hole (7) is formed. The structure is surrounded by the body (7a). More specifically, the EPROM chip (4) and its E are surrounded by the wall (7a).
The wire lines for bonding and connecting the PROM chip (4) and the conductive path (3) in the vicinity are enclosed.

Further, the space (7b) surrounded by the wall body (7a) is filled with one or more layers of resin, and the EPROM chip (4) and the wire wire are completely covered with the resin. EPROM
The resin of the first layer directly coated on the chip (4) is EPRO
An ultraviolet ray transmissive resin (15a) is used because it is necessary to transmit ultraviolet rays when erasing the data of the M chip (4). The ultraviolet transparent resin (15a) is not limited as long as it is a non-aromatic resin, and for example, methyl silicon rubber or silicon gel is used.

In this embodiment, the second layer resin layer (15b) is filled on the first layer ultraviolet-transparent resin (15a). Unlike the first layer, the second resin layer is made of a UV impermeable resin (15b) that blocks UV rays in order to prevent erroneous erasure of the EPROM chip (4). This UV impermeable resin (15
b) is not limited as long as it is a resin containing an aromatic ring (benzene ring), and for example, an epoxy resin or a polyimide resin is used, and the resin is filled until it substantially coincides with the upper surface of the case material (8).

Therefore, only the EPROM chip (4) is surrounded by the wall body (7a) and covered with resin, and the other microcomputer (5) and the circuit elements (6) around it are provided with the case material (8) and the substrate (2). It will be arranged in the sealed space (14) formed by.

As described above, the microcomputer (5) connected to the EPROM chip (4), the peripheral circuit elements (6), the switch (17), and the parallel / serial conversion circuit (101) are the substrate (2) and the case material ( Sealed space part (14) formed in 8)
It is set to be placed in. That is, all elements such as chip-shaped electronic components and resistance elements such as printing resistors and plating resistors are provided in the sealing space (14).

By the way, in the present embodiment, the space (7
b) to the ultraviolet transparent resin (15a) and the non-transparent resin (15a)
Impermeable resin (15b) consisting of a two-layer resin structure of b)
As shown in FIG. 4, instead of the non-transparent resin (15b), even if the sealing material (16) for shading is adhered to the hole (7) of the case material (8), the ultraviolet rays are completely blocked. can do.

In the case of erasing the data of the EPROM chip (4) in this embodiment, the UV impermeable resin (15b) or the sealing material (16)
Then, it is erased by irradiating it with ultraviolet rays for a predetermined time. When peeling off the ultraviolet permeable resin (15a), the resin (15a) does not break the wire due to its weak adhesion.

Next, rewriting after erasing the data of the EPROM chip (4) will be described.

FIG. 5 is a block diagram showing the hybrid integrated circuit described above.

Are input / output terminals to which the external leads (12) are connected,
(5) is a microcomputer, (4) is EPROM, (1
8) is a peripheral circuit, (19) is a power supply circuit for writing, (17) is a switch, and (101) is a parallel / serial conversion circuit.

As shown in FIG. 6, the switch (17) is composed of an element having one circuit and two contacts. In this embodiment, a CMOS manufactured by Motorola is used.
MC 14053 multiplexer is used.

The switch (17) is connected between the EPROM (4) and the microcomputer (5), and electrically connected to the microcomputer (5) when the EPROM (4) performs normal operation,
When writing data to the EPROM (4), it is electrically separated from the microcomputer (5).

The switch (17) has only the number necessary for writing the program data in the EPROM (4), for example, 12
In case of 8K-bit EPROM, control for writing / reading addresses Aφ to A ₁₃ (14 lines) and data Dφ to D ₇ (8 lines) and total of power supply V _PP , PGM, OE, CE (4 lines) 26 switches (1
7) is required, but in this case, since the off-the-shelf MC 14053 is used, the number of switch elements mounted on the board is actually 8 stones. When it is necessary to reduce the number of switch elements to be mounted, it is possible to downsize the board by using an ASIC IC such as a CMOS gate array or standard cell.

On the other hand, the other end of the switch (17), one end of which is connected to the microcomputer (5), is connected to the parallel / serial conversion circuit (101), and is used for writing a serial signal from the parallel / serial conversion circuit (101). It is connected to the writing terminal of the book. That is, the terminals (1) to (4) are dedicated to reading (during normal operation), and the terminals are dedicated to writing. The terminal is a terminal dedicated to conversion input for converting the switch (17), and the terminal is a dedicated power supply terminal for writing data to the EPROM (4).

Needless to say, the number of switches (17) increases or decreases depending on the EPROM data capacity or writing method.

Next, the actual writing method will be described.

EPROM (4) power supply terminals except for V _CC and GND Address terminals Aφ to A ₁₃ Data terminals Dφ to D ₇ , write / read control terminals CE, OE, PGM, V _{PP A} total of 26 terminals are 1 circuit 2 contacts Connected to 26 of the switches (17).

The normal mode side terminals of the 24 switches (17) of Aφ to A ₁₃ , Dφ to D ₇ , CE, OE are from the microcomputer (5),
Connected to 24 signal lines required for EPROM data read operation.

The normal operation mode side terminals of the two switches (17) connected to PGM and V _PP of EPROM (4) are grounded to GND,
In normal mode, EPROM (4) operation is limited to read operation, and accidents due to writing are prevented.

EPRO of the write mode side terminals of 26 switches (17)
The write mode terminals of 25 switches (17) other than the switch (17) connected to V _PP of M (4) are connected to the parallel / serial conversion circuit (101).

It is already known that the parallel / serial conversion circuit has a function of converting a serial signal into a parallel signal.
As described above in this embodiment, the one-chip microcomputer 8051 manufactured by Intel Corporation is used, but any device having a function of converting a serial signal into a parallel signal may be used as long as it has a function of combining a plurality of elements. However, when it is formed on an integrated circuit board, it is preferable that one element has the function as much as possible.

By the way, two input / output lines are derived from the parallel / serial conversion circuit (101) and connected to the terminals. This terminal is a dedicated terminal for writing serial signals. Needless to say, the normal operation dedicated terminals ~ are peripheral circuits (18).
It is connected to the.

On the other hand, the parallel / serial conversion circuit (101) is in the OFF state during normal operation, that is, in the read state, and the EPROM (4)
Design so that it will be turned on at the timing of writing data to. This power source may be supplied from the internal circuit as long as it has the same potential as the power source of the internal circuit, and a separate power source terminal may be provided.

By the way, switching between the normal operation mode and the write mode of the hybrid IC is performed by inputting "H" and "L" level signals into the input terminals dedicated to mode conversion. When an "H" level signal is supplied to the input terminal dedicated to mode conversion, 26 connections of the switch (17) are converted to the write mode side and connected.

At the same time, the "H" level input signal is supplied to the base of the transistor Q ₁ to the V _PP input required when writing data to the EPROM (4), so that the transistor Q ₁ is turned on.
Then, the base of the transistor Q ₂ is grounded, the transistor Q ₂ is turned on, + 21V is energized from the input / output terminal, and + 21V for writing is supplied to the V _PP input via the switch (17) and is in the writing state. Is reset.

The operation of writing program data to the EPROM (4) is first performed by erasing the data of the EPROM chip built into the hybrid IC.

Data was erased by writing an ultraviolet ray generator, usually an EPROM eraser, and irradiating it with ultraviolet rays for about 30 minutes toward the ultraviolet ray irradiation hole (7) attached to the hybrid IC package, and it was written in the EPROM (4). All data will be at level "1". Normally, the irradiation time is set with a sufficient margin so that the data will not be erased.

Next, the so-called EPROM WRITER is prepared, and the program data to be stored in the EPROM (4) is input. It is important that the ROM WRITER used in this embodiment is a ROM WRITER dedicated to a serial signal that outputs a serial signal.

Normally, the ROM WRITER outputs parallel signals, but the former one has a large number of external leads. Therefore, in this embodiment, the ROM WRITER for serial signals is intentionally used. As a result, it is possible to reduce the number of external leads for writing, which will be described later.

Since the ROM WRITER can be made serial only by changing the design of the device, it does not affect the present embodiment.

It is possible to input data to EPROM WRITER by manually inputting data to EPROM address one by one. However, because of time and reliability of operation, it is usually the host computer and ROM that develop the program. The WRITER is electrically connected and the data is transferred from the computer directly to the memory inside the ROM WRITER to store the data. Hybrid IC
The connection between ROM WRITER and ROM WRITER is as shown in Fig. 7.
It is performed between the hybrid connection socket (20) connected to (20a).

Normally, if you want to write EPROM alone instead of hybrid IC, insert the EPROM you want to write into the socket of ROM WRITER and put into immediate data writing operation. However, in the case of a hybrid IC, the EPROM socket (20) attached to the ROM WRITER and at least the write-only terminal are connected.

Next, I / O terminal of hybrid IC and ROM WRITER (20
Connect the terminals other than those connected to the socket (20) in a). That is, since it is necessary to convert the normal dedicated mode to the write only mode, the terminals are connected to a predetermined connection portion in order to convert the mode to the write only mode by supplying signals of "H" and "L" levels to the terminals. . The "H" level input signal switch (17) input from the mode conversion dedicated terminal is connected to the ROM writing mode side. At this time, EPR
+ 21V is supplied from the terminal to the V _PP input terminal of OM (4).

The electrical connection state in this state is ROM WRITER
The state is exactly the same as when writing and reading M, and from the next operation, it will be the same as the normal ROM WRITER operation, only the write signal is serial, but this serial signal is parallel The serial conversion circuit (101) converts it into a parallel signal at any time and writes it in the EPROM (4).

Next, as the operation on the ROM WRITER (20a) side, the ROM WRI
Since the data to be written to the EPROM is prepared in the TER (20a) memory, data writing is started.

The actual write operation of ROM WRITER is automatically performed by the following procedure.

The ROM writer described here is a serial-compatible device as described above. The ROM writer has two signal lines, one for transmitting and the other for receiving. These two lines are connected to the write-only terminal of HIC to send and receive data. That is, unlike the ordinary ROM writer, the timing control of the ▲ ▼, ▲ ▼, and ▲ ▼ terminals is performed by the serial-parallel conversion circuit inside the HIC. Since the 8051 one-chip microcomputer manufactured by Intel is used in this embodiment, it is possible to add the function of the write / read timing generation circuit. Since this timing control is different for writing and reading, it must be commanded by the ROM writer that it is either control. For this, a signal for distinguishing between writing and reading may be sent together with the address and the data.

First, (i) it is confirmed whether all the memories of the EPROM are completely erased, and a read signal and an address are given from the ROM writer. In the HIC, it receives serial data, converts the address to parallel, and gives it to the EPROM. Since it is reading, set each control signal to the reading state (▲ ▼ to H, ▲
▼, ▲ ▼ are made active "L"), EPROM
Read more data. The read data is converted into serial data and sent to the ROM writer. At the ROM writer, check the data to see if it has been erased. This is done by counting up from a younger address one by one, and if there is a part that has not been erased, the ROM writer sounds a warning sound and does not enter the next step.

(Ii) Start writing data in ascending order of EPROM address. Addresses Aφ to A ₁₃ , data Dφ to D ₇ and write signals are sent serially from the ROM writer. In the HIC, these are converted into parallel data and given to the EPROM.
Since it is writing, the 8051 sets ▲ ▼ to H and ▲ ▼ to L, and further applies a pulse of ▲ ▼ having a width of 1 msec.

(Iii) At the same address as (ii), put the EPROM in the read state (the same state as (i)), read the data written in (ii), and write the read data in (ii). Compare if it is the same as the complicated one.

If the data is not the same, the operation returns to (ii) and writing is performed with the same address and data. When the written data becomes the same as the written data, the writing operation of (ii) is automatically performed several times to secure the margin for EPROM data retention stability and reliability improvement. Writing of one address is completed.

(Iv) The address is counted up by 1, and the writing of the data is repeated from the procedure of (ii).

The ROM WRITER automatically advances the writing operation of (i) to (iv), and the operation of the ROM WRITER automatically stops when the completion of writing of all address data of the EPROM can be confirmed.

With the above operation, new data can be written to the EPROM in the hybrid IC by serial signal, and ROMWRITER (2
If the external lead (12) connected to each terminal is removed from the socket (20) of 0a), the data writing of the EROM (4) mounted in the hybrid IC is completed.

A specific example of a hybrid integrated circuit device for a modem using the present invention will be shown below.

First, a modem (MODEM) exists for data communication in which digitized data handled by a data terminal such as a personal computer is transmitted and received at a distance from each other using a telephone line. The function of the modem is to modulate the digitized data by using the frequency that can be used in the telephone line, convert it into an analog signal and put it on the telephone line, and the analog signal modulated with the data sent from the other party. It has the function of demodulating and returning to digitized data.

The modem will be briefly described based on the block diagram shown in FIG.

FIG. 8 is a block diagram when a modem is mounted on the integrated circuit board (2).

The modem stores a data transmitted from a personal computer in a built-in memory and outputs the data, and a micro that outputs a predetermined output signal based on the data output from the DTE interface (21). A computer (5), an EPROM chip (4) containing data addressed by a microcomputer (5), and a first and a second that modulate and demodulate an output signal from the microcomputer (5) and output to an NCU (NETWORK CONTROL UNIT). A desired DT according to the output signals from the second modulation / demodulation circuits (22) (23) and the microcomputer (5).
And a DTMF generator (24) for generating an MF signal (tone signal). Further, in the modem circuit of this embodiment
A switch (17) for converting the normal operation dedicated mode used for reading the data of the EPROM (4) during normal operation and the write only mode used for writing the program data to the EPROM (4), and the normal operation mode and write It has a voltage switching circuit (17c) for converting each voltage in the mode and a parallel / serial conversion circuit (101) for writing data by a serial signal.

The DTE interface is composed of an IC such as STC9610 (Seiko Epson), and as shown in FIG. 9, a transmission memory that supplies the output signal of the personal computer, accumulates the output signal in the internal memory, and outputs it to the microcomputer (5). Section (25), a reception memory section (26) for accumulating a signal supplied with an output signal from the microcomputer (5) in a built-in memory and outputting it to a personal computer, a transmission memory section (25) and a reception memory section The control unit (27) switches each signal input and output via the (26) and has a predetermined function for connecting the personal computer (28) and the microcomputer (5).

The microcomputer (5) is composed of, for example, an IC such as STC9620 (Seiko Epson), and as shown in FIG. 10, it is recognized by the command recognition unit and the command recognition unit that recognizes the output signal output from the DTE interface (21). The command decoding unit that decodes the output signal, the command execution unit that compares the data in the memory unit based on the signal decoded by the command decoding unit and supplies the data to the modem circuit, the data in the command decoding unit and the data in the memory unit When incorrect data is supplied to the command execution unit as a result of comparison with
The DTE interface (21) includes a response code generation unit that outputs an output signal.

The modulation / demodulation circuit (28) converts the digital signal transmitted from the microcomputer (5) into an analog signal and transmits it to the NCU unit. On the contrary, it converts an analog signal transmitted from the NCU unit into a digital signal and transmits it to the microcomputer (5), and has low-speed and medium-speed circuits. The first modulation / demodulation circuit (22) is 30
This is a low-speed modulation / demodulation circuit of 0 bps, and the second modulation / demodulation circuit (23)
Is a 1200bps medium speed modulation / demodulation circuit. One of the first and second modulation / demodulation circuits (22, 23) is selected by the microcomputer (5).

The DTMF generator (24) generates a predetermined DTMF signal by inputting the data output from the command execution unit of the microcomputer (5) to the input terminals of each of COL and ROW, and transmits AMP.
Output to (29a) and supply signal to telephone line.

As the switch (17), for example, the multiplexer CMOS MC 14053 manufactured by Motorola, Inc. is used as described above. The switch (17) is connected between the microcomputer (5) and the EPROM (4).

Program data for setting various modes of the modem is stored in the EPROM chip (4) and is supplied to the microcomputer (5) based on the address of the microcomputer (5).

Next, the operation of the modem will be briefly described. In explaining the operation of the modem, the switch (17) for converting each of the normal mode and the write-only mode is selected on the normal dedicated mode side for performing the normal operation.

First, when starting personal computer communication, the switch (1
Predetermined address data is supplied to the EPROM chip (4) via 7), and program data of the EPROM chip (4) based on the address is supplied to the microcomputer (5) via the switch (17). , It is confirmed that various modes such as communication standard (BELL / CCITT standard), communication speed (300 / 1200bps), matching of data format, switching of DIP switch mode, etc. of each communicating modem are matched. .

Assuming that the various modes are the same, enter the telephone number of the answering modem into the personal computer. The telephone number is input to the DTE interface (21) for interfacing with a personal computer and transferred to the microcomputer (5) for decoding the telephone number. The decrypted result
Send to DTMF generator (24) and DTMF from DTMF generator (24)
A signal is transmitted and the signal is transferred to a general telephone line via a transmission AMP (29a) and a line transformer (29c).

The transferred DTMF signal sends a calling signal to the answering modem, and the answering modem receives the calling signal and automatically receives the incoming call. Then, the answering modem sends the answer tone to the calling modem for the connection procedure.

The modem on the calling side passes through the line transformer (29c) and the receiving amplifier (29b), and the low speed modulation / demodulation circuit (22) detects whether or not the answer tone is a predetermined answer tone for the modem on the calling side. . If it is a predetermined answer tone, the communication state is entered.

In the communication state, parallel data from the personal computer is input to the DTE interface (21) based on a predetermined key input signal from the keyboard of the calling personal computer, and the data is transferred to the microcomputer (5). Here, the parallel data is converted into serial data. The digital signal converted into serial data is transmitted to the low speed modulation / demodulation circuit (22). Here, the digital signal is converted into an analog signal, frequency modulation FSK is performed based on the communication standard corresponding to it, transmission AMP (29), line transformer (32)
To the modem on the answering side.

On the other hand, the frequency-modulated analog signal sent by the key input signal of the response side personal computer is sent to the calling side modem and input to the low speed modulation / demodulation circuit (22) via the line transformer (29c) and the receiving AMP (29b). To be done. Here, the analog signal is converted into a digital signal and the DTE interface (2
It is input to 1), converted from a serial digital signal to a parallel digital signal, and input to the calling personal computer. As a result, the personal computer for the calling side and the personal computer for the answering side can perform full-duplex communication, thus realizing personal computer communication.

FIG. 11 is a plan view of the modem circuit shown in FIG. 8 mounted on the substrate (2) used in this embodiment, and the circuit elements to be mounted have the same reference numerals. The connection between the EPROM chip (4) and the microcomputer (5) is shown by a bus line. The conductive paths connecting the plurality of circuit elements are omitted because they are complicated.

As shown in FIG. 11, a plurality of fixing pads (3a) to which the external lead terminals (12) are fixed are provided on the opposing peripheral ends of the substrate (2). A plurality of circuit elements and a plurality of circuit elements are provided at predetermined positions on the conductive path (3) extending from the fixing pad (3a).
The EPROM chip (4) is fixed. As described above, a plurality of circuit elements including the EPROM chip (4) and the microcomputer (5) and a switch (17) for converting each read / write dedicated mode are fixed on the substrate (2). , (21) is DTE interface, (22) (23)
Are first and second modulation / demodulation circuits, (24) is a DTMF generation circuit, (17) is a switch, (17c) is a voltage conversion element, and (10)
1) is a parallel / serial conversion circuit used for writing, (5) is a microcomputer, and (6) is a chip component such as a capacitor.

As shown in FIG. 11, the EPROM chip (4) is fixed near or adjacent to the microcomputer (5). By fixing the EPROM chip (4) near or adjacent to the microcomputer (5), the bus line between the microcomputer (5) and the EPROM chip (4), that is, the routing line of the conductive path (3) The distance can be set at the shortest distance and the shortest distance, and other mounting patterns can be effectively used and high-density mounting can be performed. The area surrounded by the alternate long and short dash line shows the area where the case material (8) is fixed with an adhesive sheet.

EPROM chip (4) and microcomputer (5)
By providing the switch (17) between them, it is possible to easily switch between the read-only mode and the write-only mode by the switch (17), and the dedicated patterns (modes) for writing and reading (during normal operation) Will be formed. As a result, data can be written easily.

Furthermore, the parallel / serial conversion circuit (101) is provided between the switch (17) and the write-only terminal, so that data can be written to the EPROM (4) with two write terminals, providing a hybrid with a small number of read terminals. can do.

FIG. 12 shows the case material (8) on the substrate (2) shown in FIG.
FIG. 9 is a plan view of a finished product of the hybrid integrated circuit device for the modem when the IC chip is fixed, and shows the upper surface of the second resin layer (15b) coated on the EPROM chip (4) from the upper surface of the case material (8). Only the state is exposed. That is, all the elements other than the EPROM chip (4) are sealed in the sealing space (14) formed by the case material (8) and the substrate (2).

A part of the large number of external leads (12) exposed from the case material (8) is a lead that is also used in each dedicated mode of the EPROM chip (4) during normal operation and write operation. (12X) is a dedicated terminal for applying an input signal for converting each mode.

The EPROM of the hybrid integrated circuit device for modems described in detail above should be ready for the diversification of product specifications, and to easily respond to the specification changes required by the set manufacturer (user) such as the destination, OEM, and in-house sales. You can That is, the circuit configurations other than EPROM were designed in advance to support various specification changes, but when a hybrid integrated circuit was designed based on the specifications of a specific user, it may not match the specifications of other users. In that case, conventionally, it was necessary to review the design of the hybrid integrated circuit itself.

However, in the hybrid integrated circuit device of the present invention, the normal operation mode used when reading data from the EPROM chip (4) is used.
First and second switches (17a) (17b) for switching between write mode when writing data to the EPROM chip (4)
Since the specified program data can be written to the EPROM chip (4) while the EPROM chip (4) is still mounted, the program in the EPROM chip (4) can be changed by design change or the like. -Even if the data is changed, the program data can be easily written to the EPROM chip (4).

In the embodiments described in detail above, the EPROM and the microcomputer are separate ICs, but the nonvolatile memory also includes a microcomputer with an EPROM. The same operation as described above can be performed in the EPROM built-in microcomputer.

FIG. 13 is a block diagram when an EPROM built-in microcomputer is used. As is apparent from FIG. 13, the first switch is connected to the 17ROM built-in microcomputer and the peripheral circuit (18). Of course, the EPROM built-in microcomputer shown in FIG. 13 is hybridized on the substrate. In this case, a hole is provided in the case material just above the microcomputer in which the EPROM is built in. Therefore, erasing / writing of EPROM data can be performed by the same operation as described above.

According to the present invention, the hole (7) is provided at a desired position of the case material (8), and the EPROM chip (4) is provided in the conductive path (3) on the substrate (2) exposed in the hole (7). And the adjacent conductive paths (3) are connected by wire wires, and the microcomputer (5) and other circuit elements (in the sealed space (14) formed by the substrate (2) and the case member (8) ( By fixing 6), the integrated device of the hybrid integrated circuit and the EPROM chip (4) has a great feature that it can be made extremely small.

Further, in the present invention, the conductive path dedicated to the normal mode and the conductive path dedicated to the write mode are independently provided, and a switch (17) for selecting each mode is provided. Predetermined program data can be written to the chip (4). Further, in the present invention, the parallel / serial conversion circuit (101) is provided, so that there is an advantage that writing can be performed with two writing leads and the size of the integrated circuit can be reduced.

(G) Effect of the Invention As described in detail above, according to the present invention, first, the hole (7) is provided at a desired position of the case material (8), and the substrate (2) exposed through the hole (7). Since the EPROM chip (4) is connected to the upper conductive path (3), there is an advantage that the mounting position of the EPROM chip (4) can be arbitrarily selected. Therefore, considering the electrical connection with the built-in microcomputer, the EP
The ROM chip (4) and the microcomputer (5) can be connected to each other, and the wiring of signal lines can be eliminated. More specifically, the most closely related microcomputer (5) can be placed adjacent to the EPROM chip (4), resulting in EP
The data lines for exchanging data between the ROM chip (4) and the microcomputer (5) can be realized with the shortest distance or the layout that is the easiest to design, and the loss of the packaging density due to the routing of the data lines can be minimized.

Secondly, the EPROM chip (4) is arranged in the hole (7) at a desired position of the case material (8), and the integrated circuit board (2) is formed.
By increasing the packaging density of the microcomputer and the peripheral circuit elements incorporated therein, the conventionally required printed circuit board can be eliminated, and a hybrid integrated circuit device having an extremely miniaturized EPROM chip (4) can be realized.

Thirdly, a conductive path dedicated to the normal operation and a conductive path dedicated to the write operation are provided in respective dedicated modes, and the EPROM chip (4) is mounted after erasing the data of the EPROM chip (4) by switching by the switch (17). EPR as it is
Predetermined program data can be written in the OM chip (4). As a result, even if the specification of the data of the EPROM chip (4) is changed immediately before the hybrid integrated circuit device containing the EPROM chip (4) is delivered to the user, there is a great merit that it can be coped with very easily. .

Fourth, EPROM is provided by providing a parallel / serial conversion circuit.
Data can be written to the serial signal using a serial signal, and as a result, the number of dedicated read leads can be minimized (2), and a hybrid integrated circuit with an EPROM chip that can be erased and written is extremely small. Can be realized.

Fifth, by using a metal substrate as the integrated circuit substrate (2), its heat dissipation effect can be greatly improved compared with a printed circuit board, and it can contribute to further improvement in mounting density. Further, by using the copper foil (11) as the conductive path (3), the resistance value of the conductive path (3) can be significantly reduced as compared with the conductive paste, and the mounted circuit can be expanded to a level equal to or larger than that of the printed circuit board.

Sixth, the microcomputer (5) connected to the EPROM chip (4) and its peripheral circuit element (6) are placed in the sealed space (14) formed by the case material (8) and the integrated circuit board (2). Since it is incorporated in a die shape or a chip shape, it has an advantage that the occupied area becomes extremely smaller than that of a conventional printed circuit board that is resin-molded, and the packaging density can be greatly improved.

Seventh, by substantially matching the peripheral edges of the case material (8) and the integrated circuit board (2), almost the entire surface of the integrated circuit board (2) can be used as the sealing space (14), and the packaging density Combined with the improvement, an extremely compact hybrid integrated circuit device can be realized.

Eighth, resin layer (15b) for shading on EPROM chip (4)
Is provided, the EPROM chip (4) can be protected and can be shielded from light, and the EPROM chip (4) can be protected.
This has the advantage that the gap between the hole and the hole (7) can be sealed.

Ninth, the external leads (12) can be led out from one side of the integrated circuit board (2) or the opposite sides, and there is an advantage that an extremely multi-pin hybrid integrated circuit device can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing this embodiment, and FIG. 2 is I- in FIG.
I sectional view, FIG. 3 is a sectional view of the substrate used in the embodiment, FIG.
FIG. 7 is a sectional view showing another embodiment, FIG. 5 is a block diagram showing this embodiment, FIG. 6 is a block diagram showing a switch element used in this embodiment, and FIG. 7 is an EPRO of a hybrid integrated circuit device.
FIG. 8 is a perspective view showing a case of writing data in M, FIG. 8 is a block diagram showing a modem used in this embodiment, and FIG.
A block diagram showing the DTE interface of the modem shown in the figure, FIG. 10 is a block diagram showing the microcomputer of the modem shown in FIG. 8, and FIG. 11 is a block diagram showing the block diagram shown in FIG. 8 mounted on a substrate. Fig. 12 is the plan view of Fig. 11
A plan view of the case material fixed on the substrate shown in the figure,
FIG. 13 is a block diagram showing another embodiment, FIGS. 14 and 15
FIG. 1 is a sectional view showing a conventional EPROM mounting structure. (1) ... hybrid integrated circuit device, (2) ... integrated circuit board, (3) ... conductive path, (4) ... EPROM chip,
(5) …… Microcomputer, (6) …… Circuit element, (7) …… Hole, (7a) …… Wall, (8) …… Case material, (15a) …… UV transparent resin, ( 15b) ... UV opaque resin, (17) ... switch, (101) ... parallel / series conversion circuit.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Osamu Nakamoto 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Katsumi Okawa 2-18 Keiyo Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yasuhiro Koike, 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Masao Kaneko 2-18, Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Seiwa Ueno 2-18, Keihanhondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yasuo Saito 41-1, Omama-cho, Yamama-gun, Gunma Prefecture Tokyo IC

Claims (7)

[Claims] 1. An integrated circuit substrate, a conductive path having a desired pattern formed on the substrate, a nonvolatile memory chip connected to the conductive path, data read from the memory chip and on the substrate. A microcomputer connected to the conductive path and its peripheral circuit element, and a case material integrated with the substrate, the electrodes of the nonvolatile memory chip and the desired conductive path are connected by a bonding wire, At least the microcomputer and its peripheral circuit elements are arranged in a sealed space formed by the substrate and the case material, and a write-only mode used during a write operation for writing and reading predetermined program data to and from the memory chip, and the memory. Assigned to the normal dedicated mode used during normal operation that only reads data from the chip. A plurality of switch elements connected to the conductive path on the substrate, one end of which is connected to the switch element and which has a plurality of conductive paths that are used only in the write-only mode; A hybrid integrated circuit device, wherein a conversion circuit is connected. 2. An external lead dedicated to inputting a serial signal for inputting a serial signal is connected to the other end of a conductive path extending to one side of the substrate, the external lead being connected to the conversion circuit. The hybrid integrated circuit device according to claim 1. 3. The memory chip, the switch element, and the conversion circuit, one end of which is connected to have a conductive path dedicated to conversion used during conversion of a write or read mode, and the other end to which the conductive path extends. 2. The hybrid integrated circuit device according to claim 1, wherein an external lead dedicated to conversion is connected to. 4. The hybrid integrated circuit device according to claim 1, wherein a metal substrate whose surface is insulated is used as the integrated circuit substrate. 5. The hybrid integrated circuit device according to claim 1, wherein a copper foil is used as the conductive path. 6. The hybrid integrated circuit device according to claim 1, wherein the microcomputer is mounted on the conductive path in a die shape. 7. The hybrid integrated circuit device according to claim 1, wherein a peripheral end portion of the case material is substantially aligned with a peripheral end portion of the substrate.