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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.

Features

  • High Speed Operation: tpd (P or Q to Output) = 17 ns typ (C L = 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 (Ta = 25°C) Function Table Input Data P, Q P=Q P>Q P.

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Full PDF Text Transcription

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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.
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