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HD74HC688 Datasheet

  • HD74HC688

  • 8-bit Magnitude Comparator

  • 63.05KB

  • 9頁(yè)

  • HITACHI

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HD74HC688
8-bit Magnitude Comparator
Description
The HD74HC688 compares bit for bit two 8-bit words and indicates whether or not they are equal. The
P=Q
output indicates equality when it is low.
A single active low enable is provided to facilitate cascading of several packages and enable comparison of
words greater than 8-bits.
This device is useful in memory block decoding applications, where memory block enable signals must be
generated from computer address information.
Features
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High Speed Operation: t
pd
(P or Q to Output) = 17 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 碌A(chǔ) max
Low Quiescent Supply Current: I
CC
(static) = 4 碌A(chǔ) max (Ta = 25擄C)
Function Table
Input
Data P, Q
P=Q
P>Q
P<Q
X
Enable
G
L
L
L
H
P=Q
L
H
H
H

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