公开(公告)号：JPH0773687A

公开(公告)日：1995-03-17

申请号：JP13431094

申请日：1994-06-16

Applicant: ADVANCED MICRO DEVICES INC

Inventor： JIEEMUZU YUU ,  TEIAO FUO KUO

IPC: G11C17/00 ,  G11C16/06 ,  H03K17/16

Abstract: PURPOSE: To obtain an output buffer circuit programmable using a standard programmer in a high voltage although it is operated with an applied low voltage. CONSTITUTION: A program verifying logic signal from a programmer is detected with the output buffer circuit 10, and the speed of output driver transistors 12, 14 is reduced with a device speed reducing block 11 when the signal is detected. Whereby, a noise problem due to a higher voltage in programming of an EPROM device is excluded, at the same time, the output buffer circuit 10 is operated at a required performance level during the normal operation.