Registers 74F398*,74F399
74F398 Quad 2-Port Register with True and Complementary Outputs
74F399 Quad 2-Port Register
FEATURES
• Select inputs from two data sources
• Fully positive edge-triggered
• Both True and Complementary outputs–74F398
DESCRIPTION
The 74F398 and 74F399 are the logical equivalent of a quad 2-input
multiplexer feeding into four edge-triggered flip-flops. A common
Select input determines which of two 4-bit words is accepted. The
selected data enters the flip-flops on the rising edge of the clock.
The 74F399 is the 16-pin version of the 74F398, with only the true
(Qn) outputs of the flip-flops available.
The 74F398 and 74F399 are high speed quad 2-port registers. They
select 4 bits of data from either of two sources (Ports) under control
of a common select input (S). The selected data is transferred to a
4-bit output register synchronous with the Low-to-High transition of
the Clock input (CP). The 4-bit D-type output register is fully
edge-triggered. The Data inputs (I0n, I1n) and Select input (S) must
be stable only a setup time prior to and hold time after the
Low-to-High transition of the Clock input for predictable operation.
The 74F398 has both Q and Q outputs.
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