CN102386753A - High voltage-resistant output/ input circuit and related device - Google Patents
High voltage-resistant output/ input circuit and related device Download PDFInfo
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- CN102386753A CN102386753A CN2010102861312A CN201010286131A CN102386753A CN 102386753 A CN102386753 A CN 102386753A CN 2010102861312 A CN2010102861312 A CN 2010102861312A CN 201010286131 A CN201010286131 A CN 201010286131A CN 102386753 A CN102386753 A CN 102386753A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/046—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere responsive to excess voltage appearing at terminals of integrated circuits
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Abstract
The invention relates to a high voltage-resistant output/ input circuit and a related device. An output/input circuit in an integrated circuit is used for generating a bias voltage which is larger than an internal operating voltage in a charge pump by the charge pump, and a switch circuit is arranged between the external world and an internal circuit of the integrated circuit. When the external world and the internal circuit are communicated with each other by the switch circuit, a clamp voltage can be provided according to the bias voltage and a striding voltage provided by the switch circuit, so that the voltage of the internal circuit can be limited to be lower than the clamp voltage, and the internal circuit cannot be influenced by the external overvoltage.
Description
Technical field
But the present invention refers to especially that about a kind of output/input circuit and relevant apparatus of tolerating high voltage a kind of internal switch circuit capable of using and charge pump setting clamp voltage is to prevent the output/input circuit and the relevant apparatus of extraneous high voltage influence.
Background technology
Electronic installation miscellaneous is the most important hardware foundation of modern information society.In general, usually can integrate the integrated circuit (IC, Integrated Circuit) of a plurality of difference in functionalitys in the electronic installation with circuit board (like printed circuit board (PCB) etc.), making between each integrated circuit can the switching signal data, organizes out the allomeric function of electronic installation.Therefore, how to make the normally exchange data signals and don't the interference that can interact of different integrated circuits (especially working in the integrated circuit of different running voltages), also become one of research emphasis of present IC design dealer.
Work in the integrated circuit of low running voltage, the temperature when its power consumption and running is all lower, meets modern energy-conservation demand, so the integrated circuit of this low running voltage more and more often is applied in the various electronic installations.But, the voltage withstand capability of low running voltage integrated circuit is also lower; When the integrated circuit of low running voltage via circuit board during with the integrated circuit switching signal of other high running voltages; Because the signal voltage of high running voltage integrated circuit is original just than higher; Add noise and surging or the like that circuit board is introduced, the result that both add up just very likely damages the low integrated circuit that operates voltage.For example; If the running voltage of integrated circuit be 2.5V (volt, Volt), when this 2.5V integrated circuit will operate voltage and is the integrated circuit switching signal of 3.3V with another; Because the normal signal voltage of 3.3V integrated circuit will be high to 3.3V; The circuit board noise possibly reach 0.3V again, and the 3.6V voltage of the gained that adds up will surpass the voltage that the 2.5V integrated circuit can tolerate, and makes the not normal or damage because of extraneous high voltage (overvoltage) of 2.5V integrated circuit.
Can cause signal error or more serious circuit to damage owing to make high running voltage integrated circuit directly couple low running voltage integrated circuit, the accurate translator in position can be set with as between the two interface on the circuit board that low running voltage integrated circuit and high running voltage integrated circuit couple each other.Yet the accurate translator in position can increase the cost that hardware is manufactured the processing assembling, also can increase power consumption.
Summary of the invention
Therefore; But the present invention will provide a kind of output/input circuit of tolerating high voltage and relevant apparatus; It can apply to utilize the running of internal switch circuit and charge pump in the integrated circuit of low running voltage, and the voltage of integrated circuit on the handshaking interface can be restricted in the clamp voltage; Prevent the influence of extraneous high voltage/overvoltage, make integrated circuit can tolerate high voltage.
The present invention provides a kind of output/input circuit that is arranged in the integrated circuit, and it includes a charge pump (charge pump), and a switching circuit.Charge pump is used for producing a bias voltage Vg.Switching circuit then is provided with first end, second end and the 3rd end: first end couples an outer signals, and second end is coupled to this charge pump, and the 3rd end then is coupled to an internal circuit; This internal circuit can be the function that integrated circuit is realized the handshaking interface.When switching circuit between first end and the 3rd end during conducting; Switching circuit can provide a predetermined cross-pressure Vth between second end and the 3rd end; And the accurate scope in one clamper position (by the scope between clamp voltage to a ground voltage) is provided according to bias voltage Vg and predetermined cross-pressure Vth; Be limited to this accurate scope in clamper position interior (for example, the voltage of the 3rd end points being restricted to below the clamp voltage) with position accurate (like voltage level) with the 3rd end points.
Switching circuit is set the upper limit of the accurate scope in clamper position according to the difference of bias voltage Vg and cross-pressure Vth; This upper limit is clamp voltage just, and it can equal bias voltage Vg and cross-pressure Vth poor (Vg-Vth).Charge pump and internal circuit all work in the accurate scope in an inner working position (for example; By the scope between inner working voltage vcc a to ground voltage); Then greater than the upper limit of the accurate scope in inner working position, just bias voltage Vg is greater than the inner working voltage vcc for bias voltage Vg.Jointly, the accurate scope in clamper position is also greater than the accurate scope in inner working position, and just clamp voltage (Vg-Vth) is greater than the inner working voltage vcc.Because the voltage that integrated circuit manufacture process can tolerate tolerance is usually above its inner working voltage, so clamp voltage can be greater than inner working voltage, to make full use of the tolerance enough and to spare that processing procedure provides.For example, the internal circuit of 2.5V integrated circuit can tolerate the voltage of 3.3V usually, so clamp voltage can be 3.3V (the inner working voltage 2.5V that is higher than integrated circuit).
Switching circuit can be a transistor (for example being a N passage MOS transistor), and first end of switching circuit, second end and the 3rd end difference be transistor drain, grid and source electrode for this reason; Cross-pressure Vth then can be this transistorized limit voltage (or between the grid when this transistor turns, source electrode cross-pressure).When switching circuit during conducting, drops on (when not surpassing clamp voltage (Vg-Vth)) in the accurate scope in clamper position if the position of first end is accurate between first end and the 3rd end, switching circuit can make that accurate position with first end, the position of the 3rd end is accurate follows each other.When the position of first end standard is gone beyond the accurate scope in clamper position (when surpassing clamp voltage), switching circuit is maintained in the accurate scope in clamper position the position standard of the 3rd end, makes the voltage of the 3rd end be maintained at clamp voltage.
The present invention provides a kind of integrated circuit of low running voltage, makes the internal circuit of integrated circuit couple the outer signals that an external circuitry is provided through first end of switching circuit, as the handshaking interface of integrated circuit.This extraneous circuit can be an integrated circuit that works in high running voltage, and the accurate scope in position of its running can be more than or equal to the accurate scope in clamper position.Can apply to the signal input or the signal output interface of integrated circuit; Be particularly useful for two-way output input interface; Internal circuit can export signal to first end via switching circuit, and the signal that also can will transfer to first end through switching circuit receives to internal circuit.
The present invention also provides a kind of integrated circuit that uses above-mentioned technology.Aforementioned switches circuit and internal circuit may be implemented in each connection pad circuit (similarly being output/input unit, IO cell) of integrated circuit, cooperate the bias voltage that charge pump provided, but realize out the integrated circuit of tolerating high voltage.
For further understanding characteristic of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet these accompanying drawings only provide reference and explanation, are not to be used for the present invention is limited.
Description of drawings
Fig. 1 has illustrated the output/input circuit figure of tolerating high voltage of the embodiment of the invention.
What Fig. 2 illustrated is the voltage curve when circuit operates among Fig. 1.
Fig. 3 is the flow chart according to the output/input circuit of embodiment of the invention tolerating high voltage.
The main element symbol description
10 integrated circuits
12 charge pumps
16 connection pad circuit
18 internal circuits
20 switching circuits
22 connection pads
24 output/input circuits
26 external circuitry
100 flow processs
The 102-108 step
Vcc inner working voltage
The outside running of Vcc2 voltage
The G ground voltage
The Vth cross-pressure
Vhv, Vs, Vd voltage
The Vg bias voltage
The M transistor
The N1-N3 node
R resistance
The Clk clock pulse
Embodiment
Fig. 1 has shown that the output/input circuit 24 of the embodiment of the invention is applied to the circuit diagram of integrated circuit 10.Output/input circuit 24 can include charge pump 12 and connection pad circuit 16, and each connection pad circuit 16 can be an output/input unit.Charge pump 12 is operated between an inner working voltage vcc and the ground voltage G, just the accurate scope in an inner working position.In this embodiment, the bound of this accurate scope in inner working position can be defined by inner working voltage vcc and ground voltage G.Charge pump 12 can produce according to the inner working voltage vcc that the accurate scope in inner working position provides one than the higher voltage Vhv of inner working voltage vcc with as a bias voltage Vg.For instance, charge pump 12 can include element (not shown) such as electric capacity, switch and diode, builds up out a voltage Vhv who is higher than the inner working voltage vcc with the triggering according to a clock pulse Clk.
Connection pad circuit 16 can include switching circuit 20 and internal circuit 18; First end of switching circuit 20 (node N1) is coupled to external circuitry 26 via connection pad 22; Second end (node N2) is coupled to charge pump 12 to receive the bias voltage Vg that charge pump 12 provides, and the 3rd end (node N3) then is coupled to internal circuit 18.In this embodiment, switching circuit 20 can be formed by a N passage MOS transistor M, and its grid is accepted bias voltage Vg in node N2, and drain electrode is coupled to node N1, and source electrode then is coupled to node N3.Internal circuit 18 receives running voltage vccs and ground voltage G and operates.Can be provided with signal buffer, amplifier, gain adjustment circuit, position accurate translator (level shifter), impedance matching interlock circuit, eqalizing cricuit and/or ESD protection circuit or the like (not shown) in the internal circuit 18; Handling and the handshaking of external circuitry 26, as the handshaking interface of 26 of integrated circuit 10 and external circuitry.Except internal circuit 18; Also can include various other circuit that work in the accurate scope in different inner workings position respectively in the connection pad circuit 16 in addition; It for example is an auxiliary circuit (not shown) that works in low inner working voltage (being lower than voltage vcc); This auxiliary circuit can be coupled to internal circuit 18, with handshaking auxiliary and/or control internal circuit 18.
In the example of Fig. 1; Come equivalent external circuitry 26 with a resistance R that is connected to an outside running voltage vcc 2, representing the accurate scope in running position (can be considered the accurate scope in an outside running position) of these extraneous circuit 26 work is externally to operate between voltage vcc 2 and the ground voltage G.This extraneous circuit 26 can be circuit and/or another integrated circuit on the circuit board.On the interface of integrated circuit 10 and external circuitry 26; If the outside running voltage vcc 2 of external circuitry 26 work during greater than the inner working voltage vcc of integrated circuit 10, just needs high voltage/overvoltage that overvoltage protection mechanism prevents external circuitry 26 and damages integrated circuit 10 in the integrated circuit 10.In output/input circuit 24, the switching circuit 20 in charge pump 12 and the connection pad circuit 16 can be between node N1 and node N3 Collaboration, realize this protection mechanism.
The outer signals of external circuitry 26 can be set up voltage Vd on node N1, switching circuit 20 is coupled between external circuitry 26 and the internal circuit 18.When switching circuit 20 between node N1 and node N3 during conducting; Switching circuit 20 can provide a cross-pressure Vth between node N2 and node N3; And provide a clamper position accurate scope according to bias voltage Vg and the cross-pressure Vth that charge pump 12 is provided; Position accurate (like voltage Vs) with node N3 is limited in the accurate scope in clamper position, protection internal circuit 18.
In the embodiment in figure 1, cross-pressure Vth can be the transistor M conducting limit voltage in when running, or cross-pressure between the gate-to-source during conducting.Because the grid voltage of transistor M is the predetermined bias voltage Vg that charge pump 12 is provided, cross-pressure Vth also is the preset parameter of transistor M conducting, so when transistor M conducting, the voltage Vs of node N3 will be limited in clamp voltage (Vg-Vth); Even the overvoltage that external circuitry 26 takes place is reflected to node N1 and voltage Vd is raise, internal circuit 18 also can maintain clamp voltage (Vg-Vth) at the voltage Vs of node N3.In other words, clamp voltage (Vg-Vth) and ground voltage G can define the bound of the accurate scope in aforementioned clamper position; When switching circuit 20 conducting node N1 and N3; If the position accurate (voltage Vd) of node N1 is dropped in the accurate scope in clamper position; Just as voltage Vd during less than clamp voltage (Vg-Vth); Switching circuit 20 can make the position accurate (voltage Vs) of node N3 normally follow each other with the position of node N1 is accurate, makes normally switching signal of internal circuit 18 and external circuitry 26.On the other hand; When the position of node N1 standard is gone beyond the accurate scope in clamper position; Promptly as voltage Vd during greater than clamp voltage (Vg-Vth), 20 of the switching circuits of conducting can make that the position of node N3 is accurate to be maintained in the accurate scope in clamper position, just make voltage Vs maintain clamp voltage (Vg-Vth).
Based on the running explanation of the foregoing description, the correlation between voltage Vs and voltage Vd can be summarized in Fig. 2.As shown in Figure 2, when the voltage Vd of node N1 (Fig. 1) surpasses clamp voltage (Vg-Vth), switching circuit 20 can make the voltage Vs of node N3 follow voltage Vd; When voltage Vd surpasses voltage (Vg-Vth) (just when too high voltage attacks integrated circuit 10), switching circuit 20 just can make the voltage Vs of this internal circuit 18 be maintained at clamp voltage (Vg-Vth), protection internal circuit 18.Clamp voltage (Vg-Vth) itself can be greater than the inner working voltage vcc, but is less than or equal to 10 tolerant voltages of integrated circuit.
In this embodiment; When will be when an output/input circuit 24 that works in 2.5V inner working voltage and 26 of a 3.3V external circuitry be set up protection mechanism; Because the 2.5V circuit can tolerate the voltage of 3.3V usually, so 3.3V (or the low voltage between between 3.3V and 2.5V) can be used as the target setting value of clamp voltage.Because the value of clamp voltage is (Vg-Vth), the cross-pressure Vth during as if transistor M conducting is 0.7V, and then bias voltage Vg should be that the clamp voltage desired value adds cross-pressure Vth, just 3.3V+0.7V=4.0V.Preferably, can adopt a charge pump 12 that 4V bias voltage Vg is provided, to realize 3.3V clamp voltage in the connection pad circuit 16 together with switching circuit 20.
In sum, the present invention is realized that (design/manufacturing/production) can be summarized in the flow process 100 of the 3rd figure in the step of an integrated circuit; The key step of flow process 100 can be described below:
Step 102: the voltage that can tolerate according to the process technique and the parameter determining integrated circuit of integrated circuit.
Step 104: the voltage that can tolerate according to integrated circuit is set the predetermined target value of clamp voltage Vcmp, and preferably, this predetermined target value is the voltage that integrated circuit can tolerate, but or between withstand voltage and inner working voltage.
Step 106: the specification (like factors such as frequency, speed) of basis signal exchange interface realizes switching circuit, and learns the cross-pressure Vth that it provides according to the operating parameters of switching circuit.
Step 108: the formula according to Vg=Vcmp+Vth calculates the bias voltage Vg that charge pump should provide, and realizes this charge pump in view of the above.
Certainly, the order of above-mentioned steps also can suitably be changed, and for example can determine charge pump and bias voltage Vg (step 108) thereof earlier, obtains the required cross-pressure Vth that provides of switching circuit according to the desired value of clamp voltage Vcmp again, and realizes switching circuit in view of the above.
The present invention can apply to the signal input or the signal output interface of integrated circuit, is particularly useful for two-way output input interface.When applying to the signal input interface, connection pad circuit 16 can be the output/input unit of acknowledge(ment) signal input, and internal circuit 18 is used for receiving the signal of external circuitry 26.When applying to signal output interface, connection pad circuit 16 can be the output/input unit of a transmission signal.When applying to two-way output input interface; Connection pad circuit 16 can be the output/input unit of a two-way output input; That is to say; Internal circuit 18 can export signal to first end (node N1) via switching circuit 20, and the signal that also can will transfer to node N1 through switching circuit 20 receives to internal circuit 18.In addition, some integrated circuit similarly is RF IC or flash memory control circuit etc., and itself builds charge pump in just needing; When realization was of the present invention in this adhesive integrated circuit, the existing charge pump (and adding the suitable voltage conversion) of integrated circuit also capable of using itself provided bias voltage Vg required for the present invention.
Can be provided with a plurality of connection pad circuit 16 in the integrated circuit 10 of the present invention, the switching circuit 20 in the different connecting pad circuit 16 can be coupled to same charge pump 12, in each connection pad circuit, to set up protection mechanism of the present invention respectively.On the other hand, if integrated circuit 10 will with a plurality of external circuitry switching signals of different running voltages, the present invention can be provided with a corresponding charge pump and a corresponding switch circuit respectively to the handshaking interface of each external circuitry.Perhaps; The present invention can be provided with change the mechanism voltage that same charge pump is provided of suitable voltage and convert the required bias voltage of unlike signal exchange interface respectively in integrated circuit 10, realize protection mechanism of the present invention to cooperate the switching circuit on these handshaking interfaces.
In summary; Compared to known technology; The present invention has adopted charge pump to produce the bias voltage that is higher than inner working voltage; And the cross-pressure that cooperates switching circuit can and prevent the overvoltage influence with the higher normal switching signal of external circuitry of running voltage to set up a clamp voltage that is higher than inner working voltage, to make the integrated circuit that works in low inner working voltage, let the different various integrated circuits of running voltage can be correctly integrating operation safely.The present invention can prevent that also the electrostatic discharge protective mechanism in the integrated circuit from being triggered by extraneous high voltage by error.Known technology can be provided with the accurate translator in position with as between the two interface on the circuit board that low running voltage integrated circuit and high running voltage integrated circuit couple each other.Yet the accurate translator in position can increase the cost that hardware is manufactured the processing assembling, also can increase power consumption.In comparison, the hardware cost of the charge pump that the present invention builds in IC interior is provided with is lower, and power consumption is also very little.
In sum, though the present invention discloses as follows with preferred embodiment, so it is not in order to limit the present invention; Anyly be familiar with present technique field person; Do not breaking away from the spirit and scope of the present invention, can do various changes and retouching, so protection scope of the present invention should be limited claims.
Claims (19)
1. but the output/input circuit of a tolerating high voltage includes
One charge pump is used for producing a bias voltage; And
One switching circuit has first end, second end and the 3rd end, and this first end can receive an outer signals, and this second end is coupled to this charge pump;
Wherein, When this switching circuit between this first end and the 3rd end during conducting; This switching circuit provides a predetermined cross-pressure between this second end and the 3rd end; Make this output/input circuit and should provide a clamper position accurate scope by predetermined cross-pressure, be limited in this accurate scope in clamper position with voltage level with the 3rd end points according to this bias voltage.
2. output/input circuit as claimed in claim 1 is characterized in that, this switching circuit determines the upper limit of this accurate scope in clamper position according to this bias voltage and the difference that should be scheduled to cross-pressure.
3. output/input circuit as claimed in claim 1 is characterized in that, this charge pump works in the accurate scope in an inner working position, and this charge pump this bias voltage of generation and this bias voltage are greater than the upper limit of this accurate scope in inner working position.
4. output/input circuit as claimed in claim 1 is characterized in that the 3rd end is coupled to an internal circuit.
5. output/input circuit as claimed in claim 4 is characterized in that, this charge pump and this internal circuit work in the accurate scope in an inner working position, and this accurate scope in clamper position is greater than this accurate scope in inner working position.
6. output/input circuit as claimed in claim 1 is characterized in that, this switching circuit is a transistor, and this first end, this second end and the 3rd end are respectively this transistorized drain electrode, a grid and one source pole; And should predetermined cross-pressure be this transistorized limit voltage,
7. output/input circuit as claimed in claim 1; It is characterized in that; When this switching circuit during conducting, drops in this accurate scope in clamper position if the position of this first end is accurate between this first end and the 3rd end, this switching circuit makes accurate position of following this first end, the position of the 3rd end accurate; Prescribe a time limit the accurate upper limit that is maintained at this accurate scope in clamper position in position that this switching circuit system makes the 3rd end greater than going up of this accurate scope in clamper position when the position of this first end is accurate.
8. output/input circuit as claimed in claim 1 is characterized in that the 3rd end is coupled to an internal circuit, and this internal circuit operates on the accurate scope in an inner working position; This outer signals system is provided by an external circuitry, and the accurate scope in position of this external circuitry running is more than or equal to this accurate scope in clamper position, and this accurate scope in clamper position is greater than this accurate scope in inner working position.
9. but the output/input circuit of a tolerating high voltage is characterized in that, includes
One charge pump is used for producing a bias voltage Vg; And
One switching circuit has first end, second end and the 3rd end; This first end couples an outer signals, and this second end is coupled to this charge pump;
Wherein, when this switching circuit during with this first end conducting to the 3rd end, this switching circuit can provide a predetermined cross-pressure Vth between this second end and the 3rd end, with the voltage limit of the 3rd end points under voltage (Vg-Vth).
10. output/input circuit as claimed in claim 9 is characterized in that, this switching circuit is a transistor, and this first end, this second end and the 3rd end are respectively this transistorized drain electrode, a grid and one source pole; And should be scheduled to this transistorized limit voltage of cross-pressure Vth,
11. output/input circuit as claimed in claim 9; It is characterized in that; When this switching circuit during with this first end conducting to the 3rd end, if the voltage of this first end surpasses voltage (Vg-Vth), this switching circuit system makes the voltage of this first end of voltage follower of the 3rd end; When the voltage of this first end surpassed voltage (Vg-Vth), this switching circuit system made the voltage of the 3rd end be maintained at voltage (Vg-Vth).
But 12. the integrated circuit of a tolerating high voltage it is characterized in that, include
One charge pump is used for producing a bias voltage Vg; And
A plurality of connection pad circuit, each connection pad circuit includes:
One switching circuit has first end, second end and the 3rd end; This first termination is received an outer signals, and this second end is coupled to this bias voltage Vg;
Wherein, When this switching circuit during with this first end conducting to the 3rd end; This switching circuit can provide a predetermined cross-pressure Vth between this second end and the 3rd end, and according to this bias voltage Vg and this predetermined cross-pressure Vth one clamp voltage is provided, with the voltage of clamper the 3rd end points.
13. integrated circuit as claimed in claim 12 is characterized in that, this clamp voltage is equivalent to this bias voltage Vg and should be scheduled to the poor of cross-pressure Vth.
14. integrated circuit as claimed in claim 12 is characterized in that, this charge pump works in an inner working voltage vcc, and this bias voltage Vg is greater than this inner working voltage vcc.
15. integrated circuit as claimed in claim 12 is characterized in that, each connection pad circuit includes an internal circuit in addition, and the internal circuit of each connection pad circuit is coupled to the 3rd end in each connection pad circuit.
16. integrated circuit as claimed in claim 15 is characterized in that, this charge pump and this internal circuit work in an inner working voltage vcc, and this clamp voltage is greater than this inner working voltage vcc.
17. integrated circuit as claimed in claim 12 is characterized in that, this switching circuit is a transistor, and this first end, this second end and the 3rd end are respectively this transistorized drain electrode, a grid and one source pole; And should predetermined cross-pressure Vth be this transistorized limit voltage,
18. integrated circuit as claimed in claim 12 is characterized in that, when this switching circuit during with this first end conducting to the 3rd end, if the voltage of this first end surpasses this clamp voltage, this switching circuit makes the voltage of this first end of voltage follower of the 3rd end; When the voltage of this first end surpassed this clamp voltage, this switching circuit made the voltage of the 3rd end be maintained at this clamp voltage.
19. integrated circuit as claimed in claim 12 is characterized in that, comprises the internal circuit of a correspondence in each connection pad circuit in addition, is coupled to the 3rd end in each connection pad circuit; Wherein, each connection pad circuit is a two-way output input unit, and its corresponding internal circuit can export signal to this first end via this switching circuit, and the signal that can will transfer to this first end through this switching circuit receives to this internal circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102861312A CN102386753A (en) | 2010-09-06 | 2010-09-06 | High voltage-resistant output/ input circuit and related device |
| CN201610279401.4A CN105870903A (en) | 2010-09-06 | 2010-09-06 | High voltage resisting output/input circuit and relevant device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102861312A CN102386753A (en) | 2010-09-06 | 2010-09-06 | High voltage-resistant output/ input circuit and related device |
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| CN201610279401.4A Division CN105870903A (en) | 2010-09-06 | 2010-09-06 | High voltage resisting output/input circuit and relevant device |
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| CN102386753A true CN102386753A (en) | 2012-03-21 |
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| CN2010102861312A Pending CN102386753A (en) | 2010-09-06 | 2010-09-06 | High voltage-resistant output/ input circuit and related device |
| CN201610279401.4A Pending CN105870903A (en) | 2010-09-06 | 2010-09-06 | High voltage resisting output/input circuit and relevant device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109658871A (en) * | 2017-10-11 | 2019-04-19 | 茂达电子股份有限公司 | Back lighting device, back light system and its control method of adaptive type |
| US10892675B2 (en) | 2018-06-01 | 2021-01-12 | Excelliance Mos Corporation | Voltage converting circuit and control circuit thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5808502A (en) * | 1995-06-05 | 1998-09-15 | Hewlett-Packard Co. | Parallel micro-relay bus switch for computer network communication with reduced crosstalk and low on-resistance using charge pumps |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007267537A (en) * | 2006-03-29 | 2007-10-11 | Renesas Technology Corp | Semiconductor integrated circuit and electronic system |
| CN101526827A (en) * | 2008-03-06 | 2009-09-09 | 盛群半导体股份有限公司 | Voltage-to-current conversion circuit |
| US8098469B2 (en) * | 2008-04-16 | 2012-01-17 | O2Micro Inc. | Electricity delivery system |
| CN101751061B (en) * | 2008-12-17 | 2012-04-18 | 上海华虹Nec电子有限公司 | High voltage stabilizer and high voltage intrinsic NMOS tube |
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- 2010-09-06 CN CN2010102861312A patent/CN102386753A/en active Pending
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5808502A (en) * | 1995-06-05 | 1998-09-15 | Hewlett-Packard Co. | Parallel micro-relay bus switch for computer network communication with reduced crosstalk and low on-resistance using charge pumps |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109658871A (en) * | 2017-10-11 | 2019-04-19 | 茂达电子股份有限公司 | Back lighting device, back light system and its control method of adaptive type |
| US10892675B2 (en) | 2018-06-01 | 2021-01-12 | Excelliance Mos Corporation | Voltage converting circuit and control circuit thereof |
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| CN105870903A (en) | 2016-08-17 |
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Application publication date: 20120321 |