| 摘要 |
PROBLEM TO BE SOLVED: To provide a general-purpose logic circuit which can correspond to both of a 3 V system output destination circuit and a 5 V system output destination circuit. SOLUTION: A logic circuit is structured by a 74HCT type CMOS gate element 10 of Hi level input voltage VIH=2 V(min) and Lo level input voltage VIL=0.8 V(max) in correspondence to a TTL level input (0 to 5 V). The 74HCT type CMOS gate element 10 is operated to switch in both of 3 V system input (2.7 V to 3.3 V) and 5 V system input (4.5 V to 5.5 V), and a 5 V system voltage or a 3 V system voltage is output corresponding to a power source voltage to be supplied from an output destination circuit.
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