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HD74HCT688P Datasheet

  • HD74HCT688P

  • MAGNITUDE COMPARATOR|HCT-CMOS|DIP|20PIN|PLASTIC

  • 56.40KB

  • 8頁

  • ETC

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HD74HCT688
8-bit Magnitude Comparator
Description
The HD74HCT688 compares bit for bit two 8-bit words and indicate 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
鈥?/div>
LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
鈥?/div>
鈥?/div>
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鈥?/div>
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High Speed Operation: t
pd
(Data to
P=Q)
= 18 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 4.5 to 5.5 V
Low Input Current: 1 碌A max
Low Quiescent Supply Current: I
CC
(static) = 4 碌A max (Ta = 25擄C)
Function Table
Inputs
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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