74AC399 • 74ACT399 Quad 2-Port Register June 1988 Revised October 2000 74AC399 • 74ACT399 Quad 2-Port Register General Description The AC/ACT399 is the logical equivalent of a quad 2-input multiplexer feeding into four edge-triggered flip-flops.
A common Select input determines which of the two 4-bit words is accepted.
The selected data enters the flip-flop on the rising edge of the clock.
Features s ICC reduced by 50% s Select inputs from two data sources s Fully positive edge-triggered operation s Outputs source/sink 24 mA s AC/ACT399 has TTL-compatible inputs Ordering Code: Order Number 74AC399SC 74AC399PC 74ACT399SC 74ACT399SJ 74ACT399MTC 74ACT399PC Package Number M16A N16E M16A M16D...

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