Datasheet > HD74HCT640/HD74HCT643

HD74HCT640/HD74HCT643

更新时间： 2024-11-22 23:55:27

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HD74HCT640/HD74HCT643 数据手册

HD74HCT640/HD74HCT643

Octal Bus Transceivers (with 3-state outputs)

ADE-205-562 (Z)

1st. Edition

Sep. 2000

Description

Both the HD74HCT640 and the HD74HCT643 have one active low enable input (G), and a direction

control (DIR). When the DIR input is high, data flows from the A inputs to the B outputs. When DIR is

low, data flows from B to A.

The HD74HCT640 transfers inverted data from one bus to the other. The HD74HCT643 transfers inverted

data from the A bus to the B bus and non-inverted data from the B bus to the A bus.

Features

•

LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility

High Speed Operation: t_pd(A to B) = 14.5 ns typ (C_L= 50 pF)

High Output Current: Fanout of 15 LSTTL Loads

Wide Operating Voltage: V_CC= 4.5 to 5.5 V

Low Input Current: 1 µA max

Low Quiescent Supply Current: I_CC(static) = 4 µA max (Ta = 25°C)

Function Table

Control Input

Operation

DIR

HD74HCT640

B data to A bus

A data to B bus

Isolation

HD74HCT643

B data to A bus

A data to B bus

Isolation

12 3 4 5 6 7 8

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型号	品牌	获取价格	描述	数据表
HD74HCT640FP	ETC	获取价格	Logic IC
HD74HCT640FP-EL	HITACHI	获取价格	Bus Transceiver, HCT Series, 1-Func, 8-Bit, Inverted Output, CMOS, PDSO20, EIAJ, SOP-20
HD74HCT640FPV-E	RENESAS	获取价格	HCT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO20
HD74HCT640P	ETC	获取价格	BUS TRANSCEIVER\|SINGLE\|8-BIT\|HCT-CMOS\|DIP\|20PIN\|PLASTIC
HD74HCT640PV-E	RENESAS	获取价格	HCT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDIP20, 6.30 X 24.50 MM, 2.54 MM PITCH, PL
HD74HCT640RP	RENESAS	获取价格	HCT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO20
HD74HCT640RP-EL	RENESAS	获取价格	HCT SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO20, SOP-20
HD74HCT643	HITACHI	获取价格	Octal Bus Transceivers (with 3-state outputs)
HD74HCT643FP	ETC	获取价格	Logic IC
HD74HCT643FP-EL	RENESAS	获取价格	Bus Transceiver, HCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, EIAJ, SOP-20