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Semiconductor device and its output circuit

An output circuit, semiconductor technology, applied in the direction of logic circuits, electronic switches, electrical components, etc., can solve the problems of long access time, slow rise, difficult load, etc., to shorten the time and speed up the rise.

Active Publication Date: 2020-05-19
WINBOND ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if the supply voltage VDD of the output buffer 10 becomes about 1.8V, it is difficult to drive the load connected to the input / output terminal 30 at high speed.
like figure 2 As shown, when the output data "0" is output, the pull-down transistor Qn1 is turned on, so the access (access) time Ta from time t1 to time t2 is relatively small, but when the output data "1" is output, Since the pull-up transistor Qp1 is turned on, there is a problem that its rise becomes slow, and the access time Tb from time t3 to time t4 becomes longer than necessary.

Method used

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  • Semiconductor device and its output circuit
  • Semiconductor device and its output circuit
  • Semiconductor device and its output circuit

Examples

Experimental program
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Embodiment

[0072] Hereinafter, embodiments of the present invention will be described with reference to the drawings. image 3 is a diagram showing a configuration example of an output circuit according to an embodiment of the present invention. The output circuit 100 of the present embodiment includes: an output buffer 110 of a CMOS structure, including a pull-up PMOS transistor Qp1 and a pull-down NMOS transistor Qn1, outputting output data from the output node OUT to the external terminal 130; and a pre-buffer circuit 120 , connected to the output buffer 110 .

[0073] The pre-buffer circuit 120 is input with the output data and the read enable signal / RE, generates a pull-up signal PU and a pull-down signal PD corresponding to the output data, and supplies the generated pull-up signal PU to the transistor Qp1 for pull-up, and pulls down The signal PD is supplied to the pull-down transistor Qn1. For example, the pre-buffer circuit 120 outputs an H-level pull-up signal PU and a pull-...

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Abstract

A semiconductor device and an output circuit thereof for accelerating rising of a pull-up transistor are provided. The output circuit of the invention includes an external terminal (130), an output buffer (110) and a pre-buffer circuit (120). The external terminal (130) can output output data to an external part. The output buffer (110) is connected to the external terminal (130) and includes a pull-up transistor (Qp1) of P type and a pull-down transistor (Qn1) of N type. The pre-buffer circuit (120) outputs a pull-up signal (PU) and a pull-down signal (PD) corresponding to the output data to the output buffer (110). The pre-buffer circuit (120) also includes a circuit (122). The circuit (122) negatively boosts the pull-up signal (PU) when the pull-up signal (PU) is changed from a high level into a low level.

Description

technical field [0001] The present invention relates to a device comprising a pull-up P-channel metal oxide semiconductor (P-channel Metal Oxide Semiconductor, PMOS) transistor (transistor) and a pull-down N-channel metal oxide semiconductor (N-channel Metal Oxide Semiconductor, NMOS) transistor An output circuit, in particular to a semiconductor device and its output circuit. Background technique [0002] Complementary Metal-Oxide-Semiconductor (CMOS) inverters (inverters) or boosters are used in the output circuits of semiconductor devices such as memory or logic integrated circuits (IC). Pull type (push pull type) output buffer (output buffer). Patent Document 1 discloses an output circuit capable of outputting a high-voltage signal by configuring transistors constituting a CMOS inverter with a low withstand voltage, and Patent Document 2 discloses an output circuit that suppresses switching noise. [0003] prior art literature [0004] patent documents [0005] Paten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11C7/10
CPCG11C7/1057H03K17/102H03K19/00315H03K19/018521G11C7/12G11C7/22
Inventor 小嶋英充
Owner WINBOND ELECTRONICS CORP