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应用功能：四锁存D型触发器 NSC/MOT/TI CD4042BM/CD4042BC quad clocked ``D'' latch is a monolithic complementary MOS (CMOS) integrated circuit constructed with P- and N-channel enhancement mode transistors. The outputs Q and Q either latch or follow the data input depending on the clock level which is programmed by the polarity input. For polarity e 0; the information present at the data input is transferred to Q and Q during 0 clock level; and for polarity e