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HD74HC640 - Octal Bus Transceivers

Datasheet Summary

Description

Each device has an active enable G and a direction control input, DIR.

when DIR is high, data flows from the A inputs to the B outputs.

When DIR is low, data flows from the B inputs to the A outputs.

Features

  • High Speed Operation: tpd = 12 ns typ (CL = 50 pF) High Output Current: Fanout of 15 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 Control Inputs G L L H DIR L H X Operation HD74HC640 B data to A bus A data to B bus Isolation HD74HC643 B data to A bus A data to B bus Isolation HD74HC640/HD74HC643 Pin Arrangement HD74HC640 DIR A1 A2.

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Datasheet preview – HD74HC640

Datasheet Details

Part number HD74HC640
Manufacturer Hitachi Semiconductor
File Size 69.43 KB
Description Octal Bus Transceivers
Datasheet download datasheet HD74HC640 Datasheet
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Full PDF Text Transcription

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HD74HC640/HD74HC643 Octal Bus Transceivers (with 3-state outputs) Description Each device has an active enable G and a direction control input, DIR. when DIR is high, data flows from the A inputs to the B outputs. When DIR is low, data flows from the B inputs to the A outputs. The HD74HC640 transfers inverted data from one bus to other and the HD74HC643 transfers inverted data from the A bus to the B bus and true data from the B bus to the A bus.
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