M74HC390B1R 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

生产厂家

M74HC390B1R

DUAL DECADE COUNTER

STMicroelectronics 

M54/M74HC390

TIMING CHART

(1) BCD COUNT SEQUENCE *

(2) BI-QUINARY COUNT SEQUENCE **

*OUTPUT QA IS CONNECTED TO INPUT CLOCK B

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