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High-voltage tolerance output buffer

An output buffer, high-voltage technology, applied in the direction of logic circuit connection/interface layout, logic circuit coupling/interface using field effect transistors, etc., to avoid instability and ensure normal operation.

Active Publication Date: 2010-06-23
SEMICON MFG INT (SHANGHAI) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an output buffer that can withstand high voltage, so as to solve the problem that the standard output buffer in this type of circuit in the prior art is used for open-drain purposes and has an intermediate level in the process of switching to a high level. The problem

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Embodiment Construction

[0027] Please refer to figure 2 , figure 2It is the circuit diagram of the output buffer of the present invention that can withstand high voltage, it includes an input module, the input terminal is connected to the input signal (IN) and the output enable signal (OE), and includes a NAND gate 100 and a NOR gate 101, so The input terminals of the NAND gate 100 are IN and OE, and the input terminals of the NOR gate 101 are IN and OE; the pull-up module receives the first output signal of the input module, between the first voltage and the output point A high-impedance or low-impedance circuit is provided according to the received signal, the pull-up module includes a first transistor 21 and a second transistor 22, the gate of the first transistor 21 is connected to the output terminal of the NAND gate 100, The drain of the first transistor 21 is connected to the source of the second transistor 22, the first transistor 21 and the second transistor 22 are used for pull-up, and t...

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Abstract

The invention provides a high-voltage tolerance output buffer, comprising an input module, a pulling up module, a pulling down module, an enable control module and a voltage limiting module, the input end of the input module is connected with an input signal and an output enable signal, the voltage limiting module is connected with an inverter, the output signal of the inverter controls the conduction of the voltage limiting module, and the input signal of the inverter is the non output enable signal; the high-voltage tolerance output buffer effectively improves the performance of a standard input and outlet circuit which is used as an open-drain circuit to output waveform, reduces the tolerant maximum voltage of a voltage limiting transistor, improves the reliability of the circuit and ensures the stable operation of the while circuit.

Description

technical field [0001] The invention relates to the field of semiconductor integrated circuits, in particular to an output buffer capable of withstanding high voltage. Background technique [0002] Buffer registers are also called buffers, which are divided into input buffers and output buffers. The function of the former is to temporarily store the data sent by the peripheral so that the processor can take it away; the function of the latter is to temporarily store the data sent by the processor to the peripheral. With the numerical control buffer, the high-speed working CPU and the slow-working peripherals can coordinate and buffer, and realize the synchronization of data transmission. Since the buffer is connected to the data bus, it must have a three-state output function. In addition, the output buffer can also amplify the signal to play the role of driving, and also has the function of isolation. For example, taking the mos circuit as an example, each integrated circ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175H03K19/0185
Inventor 俞大立郭之光程惠娟陈先敏陈捷
Owner SEMICON MFG INT (SHANGHAI) CORP
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