TIMING COINCIDING CIRCUIT SIMULTANEOUSLY SUPPLYING TWO POWER SUPPLY VOLTAGES APPLIED IN DIFFERENT TIMING

摘要

An improved DRAM includes a main circuit and an output driver circuit, respectively, energized by externally applied two power supply voltages. The DRAM includes a timing coinciding circuit for making the supply-timing of the two power supply voltages to the circuits coincided to each other. When power supply voltage only is applied, output driver circuit has a tendency to consume an excessive penetrating current in response to an unstable output signal provided from main circuit. Even though the two power supply voltages are applied in different timing, the excessive current consumption in the output driving circuit is avoided, since timing coinciding circuit simultaneously starts and ends the supply of output power supply voltages.