CMOS OUTPUT DRIVING CIRCUIT FOR REDUCING SWITCHING NOISE

摘要

PURPOSE: A CMOS output driving circuit is provided to reduce a noise generated by a sharp current change. CONSTITUTION: In a CMOS output driving circuit, the first pull-up and pull-down driving devices include the first pull-up and pull-down transistors for pull-up and pull-down driving an output terminal respectively responding to an input signal supplied to an input terminal. The second pull-up and pull-down driving devices include the second pull-up and pull-down transistors for driving pull-up and pull-down driving the output terminal respectively responding to the input signal. A pull-up level control device is connected between a supply voltage terminal and a source stage of the first pull-up transistor to control a pull-up level of the output terminal. A pull-down level control device is connected between a source stage of the first pull-down transistor and a ground to control a pull-down level of the output terminal. The first charge storing device stores the charge to be required upon a pull-up driving responding to the input signal. The second charge storing device stores the charge to be required upon a pull-down driving responding to the input signal.