INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

PI N No

SYMBOL

NAME AND F UNCTIO N

1

OE

3 State Output Enable

Input (Active LOW)

2, 5, 6,

9, 12, 15,

16, 19

Q0 to Q7

Data Inputs

3, 4, 7,

8, 13, 14,

17, 18

D0 to D7

3 State Outputs

11

LE

Latch Enable

Input

10

GND

Ground (0V)

20

Positive Supply Voltage

TRUTH TABLE

INPUTS

OUTPUT S

OE

L E

D

Q

HX

X

Z

L

L

X

NO CHANGE *

LH

L

L

LH

H

H

X: DON’T CARE

Z: HIGH IMPEDANCE

*: Q OUTPUTS ARE LATCHED AT THE TIME WHEN THE LE INPUT IS TAKEN LOW LOGIC LEVEL.

LOGIC DIAGRAMS

74ACT373

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