公开(公告)号：JPH0629824A

公开(公告)日：1994-02-04

申请号：JP6154093

申请日：1993-03-22

Applicant: IBM

Inventor： SHIYANGU HOO DONGU ,  HIYUN JIYON SHIN

IPC: H03K19/013 ,  H03K19/018 ,  H03K19/0944

Abstract: PURPOSE: To make the shift of a signal sure at an output by switching a prearranged signal at an output terminal in accordance with the change of an input signal. CONSTITUTION: A circuit 20 is driven by using an input on a line T from a logical block 22. In the circuit 20, feedback control is performed from an active type signal pull-up stage to a pull-down stage through a diode D1, and a signal switching shift stage is driven. When a signal on the line T increases from L to H, the voltage drop VBE of an Q1 increases, the voltage at a point Z rapidly falls, next, the voltage at a point Y rapidly increases, the pull-down current of an Q2 drops and a signal quickly increases at an OUTPUT. The VBE and collector current returns to stableness, associated with the increase of an output, and a push-pull operation is stopped. When a signal on the line T falls from H to L, the VBE reduces, the voltage of the point Z increases, and current of the Q2 and output discharge current sharply increases.