HD74HC298 データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HD74HC298

Quad. 2-input Multiplexers (with storage)

Hitachi -> Renesas Electronics 

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: tpd (Clock to Q) = 19 ns typ (CL = 50 pF)

• High Output Current: Fanout of 10 LSTTL Loads

• Wide Operating Voltage: VCC = 2 to 6 V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: ICC (static) = 4 µA max

Function Table

Inputs

Outputs

Word Select Clock

QA

QB

QC

QD

L

a1

b1

c1

d1

H

a2

b2

c2

d2

X

H

QA0

QB0

QC0

QD0

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