| 摘要 |
A circuit for supplying a reference level to a differential sense amplifier in a semiconductor memory circuit, includes a first circuit for detecting an external power supply voltage, and a second circuit controlled by the first circuit, for controlling a reference level to be supplied to a sense amplifier, on the basis of the result of the detection of the external power supply voltage. Regardless of whether the external power supply voltage is a first power supply voltage (5 V) or a second power supply voltage (3 V), it is possible to output the reference level which can avoid occurrence of malfunction.
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