| 摘要 |
PURPOSE: A sense amplifier operation control circuit is provided, which reduces current consumption in case of a high power supply voltage(Vdd), and improves an operation characteristics of a sense amplifier in case of a low power supply voltage(Vdd), by controlling a pull-up bias voltage and a pull-down bias voltage of the sense amplifier according to a potential level of the power supply voltage. CONSTITUTION: A memory cell part(10) comprises a number of memory cells, and a bit node sense amplifier part(30) senses and amplifies data of the memory cell part during a read operation or data inputted during a write operation and then outputs them to the memory cell part. A voltage detection part(40) outputs a signal(Pwr_dt) detecting an amplitude of a power supply voltage(VDD). A selection driver part(200) generates pull-up control signals(SP1B,SP2B) controlling a time to supply an external voltage(Ex_VDD) and an internal voltage(VDC) to a pull-up bias voltage(A) of the sense amplifier part respectively by an output signal of the voltage detection part, and controls a time to supply a ground voltage(Vss) to a pull-down bias voltage(B) of the sense amplifier part by the output signal of the voltage detection part.
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