JPH0246759A - Semiconductor integrated circuit - Google Patents

Abstract

PURPOSE:To enable the lock-hold of connection state of a crosspoint switching circuit with small power consumption by constituting a circuit by using a decoding circuit, a latching circuit, a crosspoint switching circuit and a controlling circuit, and integrating them in the same package by arranging two systems of power supply terminals, i.e., a common power supply terminal and a battery backup power supply terminal. CONSTITUTION:At the operating time of semiconductor integrated circuits, VCC is supplied to a common power supply terminal 5, which VBC is supplied to a battery backup terminal 6. At the non-operating time of said device, VBC is supplied only to the power supply terminal 6 in the state of battery backup, and the connection state of a crosspoint switch is subjected to lock-up. The connection control of the crosspoint switch circuit 3 is performed by the control of an address terminal 7, a strobe terminal 8, a data R/W terminal 9. The reading of the state of connection is performed by the control of the address terminal 7, the strobe terminal 8, the data R/D terminal 9 and a status data terminal 11. In the same manner, the batch reset is performed by the control of a reset terminal(RST) 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a semiconductor integrated circuit, and is particularly used for switching switching circuits configured with a decoding circuit, a latch circuit, a cross-point switch circuit, a control circuit, etc. Regarding semiconductor integrated circuits.

[Conventional technology]

Conventionally, this type of semiconductor integrated circuit has been used for decoding circuits, latch circuits, and crosspoint switch circuits.

There is no semiconductor integrated circuit that forms a circuit with a control circuit and has two systems of power supply terminals: a common power supply terminal and a battery backup power supply terminal.

[Problem to be solved by the invention]

The conventional semiconductor integrated circuit described above did not have a battery backup terminal for self-maintenance of the cross-point switch circuit, but in order to self-maintain the connection state of the cross-point switch circuit, it required a decoding circuit, a latch circuit, and a cross-point switch circuit. Since DC power had to be supplied to all the circuits and control circuits using batteries, etc., high power consumption was required.

[Means to solve the problem]

The structure of the semiconductor integrated circuit of the present invention includes a decoding circuit, a latch circuit, a cross-point switch circuit, and a control circuit, and has two systems of power terminals, a common power terminal and a battery backup power terminal, and is packaged in the same package. The cross-point switch circuit is characterized in that the connection state of the cross-point switch circuit can be maintained by itself with low power consumption.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a semiconductor integrated circuit according to an embodiment of the present invention, in which 1 is a decoding circuit, 2 is a latch circuit, 3 is a cross-point switch circuit, 4 is a control circuit, and 5 is a common power supply (VCC) line. , 6 is a battery backup power supply (WBC) line, 7 is an address line AO to Ax,
8 is a strobe line (So), 9 is a data R/W line (R/W), 10 is a reset line (R3T), 11
is the status data line (SdO~5dx), 12~
14 is a control line, 15 is a LINE system interface line (10 to l1x), and 16 is a HO3T system interface line (IhO to IhX).

When the device using the semiconductor integrated circuit of this embodiment is in operation, VCC is supplied to the common power supply terminal 5, and VBC is supplied to the battery backup power terminal 6. When the device is not in operation, the battery backup is used for power supply. VBC is supplied only to terminal 6 to maintain the connection state of the crosspoint switch.

Connection control of the cross point switch circuit 3 is performed using address terminals (A o to Ax) 7, stroke love terminals (So) 8,
This is done under data R/W terminal (R/W) 9 (7) control.

The connected leads of cross point switch circuit 3 are as follows:
Address terminals (A a -, -A x ) 7, Strolab terminal (So) 8, Data R/W terminal (R/W) 9
, is controlled by the status data terminals (SdO to 5dX) 11.

The collective reset of the cross-point switch circuits is performed under the control of the reset terminal (R9T) 10.

Further, when the semiconductor integrated circuit of the embodiment changes from non-operating (only VBC is supplied) to operating (VCC, VBC is supplied), the cross-point switch circuit is automatically connected to the connection state that is self-maintained by the latch circuit 2.

〔Effect of the invention〕

As explained above, the present invention comprises a circuit including a decoding circuit, a latch circuit, and a cross-point switch circuit, and provides two systems of power supply terminals, a common power supply terminal and a battery backup power supply terminal, thereby achieving low power consumption.
This has the effect of self-maintaining the connection state of the crosspoint switch circuit.

Line (R/W), 10...Reset line (R3T), 11...Status data line, 12-14...Control line, 15...
・LINE interface line (I io ~ I
ix), 16...HO3T system interface line (Iho to Ihx).

Claims (1)

[Claims] The circuit consists of a decoding circuit, a latch circuit, a crosspoint switch circuit, and a control circuit, and by providing two systems of power supply terminals, a common power supply terminal and a battery backup power supply terminal, and packaging them in the same package, the cross-point switch circuit can reduce power consumption. A semiconductor integrated circuit characterized by being able to self-maintain the connection state of a point switch circuit.