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HD74HCT688 - 8-bit Magnitude Comparator

Datasheet Summary

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.

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.

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Datasheet Details

Part number HD74HCT688
Manufacturer Hitachi Semiconductor
File Size 55.72 KB
Description 8-bit Magnitude Comparator
Datasheet download datasheet HD74HCT688 Datasheet
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Full PDF Text Transcription

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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 • • • • • • 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.
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