Patent ID: 6191617
Filing Date: 2001-02-20
Classification: H03K

Abstract:
An input buffer having pull-up and pull-down transistors commonly coupled by second electrodes between a first prescribed voltage and a second prescribed voltage converts and outputs an input signal, the input buffer comprising:a control unit that receives an output signal of the input buffer, wherein the control unit turns off the pull-up transistor when the input signal is a high level, and turns on the pull-up transistor when the input signal is a low level to generate the output signal of the input buffer, wherein the control unit comprises:a first transistor having a control electrode that receives the input signal and a first electrode that receives the second prescribed voltage;a second transistor having a control electrode coupled to a second electrode of the first transistor and the output signal of the input buffer, and a first electrode that receives the first prescribed voltage; anda third transistor having a second electrode coupled to the pull-up transistor, a control electrode that receives a third prescribed voltage, and a first electrode that receives the input signal, wherein the third transistor has the second electrode coupled to a second electrode of the second transistor and a control electrode of the pull-up transistor.