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HD74HC688 - 8-bit Magnitude Comparator

Datasheet Summary

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 (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 (Ta = 25°C).
  • Ordering Information Part Name Package Type Package Code (Previous Code) Package Abbreviation HD74HC688P DILP-20 pin (JEDEC) PRDP0020AC-B (DP-20NEV) P HD74H.

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Datasheet Details

Part number HD74HC688
Manufacturer Renesas
File Size 225.74 KB
Description 8-bit Magnitude Comparator
Datasheet download datasheet HD74HC688 Datasheet
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Full PDF Text Transcription

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HD74HC688 8-bit Magnitude Comparator REJ03D0643–0200 (Previous ADE-205-529) Rev.2.00 Mar 30, 2006 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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