PURPOSE: To ensure the readout/write and storage of memory by placing precedence of an output of a word line drive circuit over an output of a DC positive feedback circuit.
CONSTITUTION: An input/output of a DC positive feedback circuit 3 having a prescribed input threshold value is connected to a word line W(l). The DC positive feedback circuit consists of two CMOS inverters 31, 32 connected in multi-stage and the input and output are connected in common to the word line W(l). The input threshold value is set nearly the intermediate value between a positive power supply potential Vcc and a negative power supply potential VEE based on the ratio of gate width to a channel length of CMOS transistors (TRs) Mp31-Mn31 constituting the input side CMOS inverter 31, known as the W/L. Moreover, the CMOS TRs Mp32-Mn32 constituting the output inverter 32 are formed such that the output of the word line drive circuit 1 takes precedence over the output of the DC positive feedback circuit 3.
TANABE TOMOKI
KUDO KATSUMI
HITACHI MICROCUMPUTER ENG
HITACHI TOBU SEMICONDUCTOR LTD