74HC298 Datasheet, PDF (1/7 Pages) Hitachi Semiconductor – Quad. 2-input Multiplexers (with storage)

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 (A₁, B₁, C₁ and D₁) is presented to the inputs of the flip-flops, and when word select is high word 2
(A₂, B₂, C₂ and D₂) 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
a₁
b₁
c₁
d₁
H
a₂
b₂
c₂
d₂
X
H
Q_A0
Q_B0
Q_C0
Q_D0