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HD74HCT688

8-bit Magnitude Comparator

Hitachi -> Renesas Electronics 

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

• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility

• High Speed Operation: tpd (Data to P=Q) = 18 ns typ (CL = 50 pF)

• High Output Current: Fanout of 10 LSTTL Loads

• Wide Operating Voltage: VCC = 4.5 to 5.5 V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°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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