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 µA max
• Low Quiescent Supply Current: I
CC
(static) = 4 µA 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
XH Q
A0
Q
B0
Q
C0
Q
D0