M74HCT640 Просмотр технического описания (PDF) - STMicroelectronics

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M74HCT640

HCT640 INVERTING, HCT643 INVERTING/NON INVERTING OCTAL BUS TRANSCEIVER (3-STATE): HCT245 NON INVERTING

STMicroelectronics 

M54/M74HCT245/640/643

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

PIN No

1

2, 3, 4, 5,

6, 7, 8, 9

18, 17, 16,

15, 14, 13,

12, 11

19

10

20

SYMBOL

DIR

A1 to A8

B1 to B8

G

GND

VCC

NAME AND FUNCTION

Directional Control

Data Inputs/Outputs

Data Inputs/Outputs

Output Enabel Input

(Active LOW)

Ground (0V)

Positive Supply Voltage

IEC LOGIC SYMBOLS

HCT245

H CT 64 0

HCT643

TRUTH TABLE

INPUT

G

DIR

L

L

L

H

H

X

X: ”H” or ”L”

Z: High impedance

FUNCTION

A BUS

B BUS

OUTPUT

INPUT

INPUT

OUTPUT

Z

Z

HCT245

A=B

B=A

Z

OUTPUT

HCT640

A =B

B =A

Z

HCT643

A=B

B=A

Z

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