HD74HC298
Quad. 2-input Multiplexers (with storage)
Description
This circuit is controlled by the signals word select and clock. When the word select input is taken low
word 1 (A
1
, B
1
, C
1
and D
1
) is presented to the inputs of the flip-flops, and when word select is high word 2
(A
2
, B
2
, C
2
and D
2
) is presented to the inputs of the flip-flops. The selected word is clocked to the output
terminals on the negative edge of the clock pulse.
Features
High Speed Operation: t
pd
(Clock to Q) = 19 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 A max
Low Quiescent Supply Current: I
CC
(static) = 4 A max
Function Table
Inputs
Outputs
Word Select
Clock
Q
A
Q
B
Q
C
Q
D
L
a
1
b
1
c
1
d
1
H
a
2
b
2
c
2
d
2
X
H
Q
A0
Q
B0
Q
C0
Q
D0
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