LOW-POWER DC VOLTAGE GENERATION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To suppress power consumption by obtaining the low electric power type DC voltage generating circuit which operates only when necessary in refresh mode. SOLUTION: A voltage generation control part 20 is provided which generates a voltage generation control signal VE by logically operating count signals Qn, Qn-1, and Qn-2 generated by a refresh counter 10 for setting a refresh period and a refresh timer driving signalϕTMO, and a DC voltage generation part 40 is provided with transistors(TR) Ps and Ns which turn on and off according to a signal VE on its power source side and ground side respectively. The signal VE becomes active only in an actual necessary period in the refresh period, e.g. a 1/8 period and only in this period, the DC voltage generating circuit is placed in operation.