M74HC651(2001) 데이터 시트보기 (PDF) - STMicroelectronics

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M74HC651
(Rev.:2001)

OCTAL BUS TRANSCEIVER/REGISTER WITH 3 STATE OUTPUTS (INVERTING)

STMicroelectronics 

M74HC651

GAB GBA CAB CBA SAB SBA

A

B

FUNCTION

OUTPUTS OUTPUTS

XXHH

Qn

HL

Qn

The data stored to the internal flip-flops are displayed

at the A and B bus respectively.

The output at the A bus are displayed at the B bus, the

HH

Qn

Qn output at the B bus are displayed at the A bus respec-

tively

X : Don’t Care

Z : High Impedance

Qn : The data stored to the internal flip-flops by most recent low to high transition of the clock inputs

* : The data at the A and B bus will be stored to the internal flip-flops on every low to high transition of the clock inputs.

LOGIC DIAGRAM

TIMING CHART

3/14

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