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INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

TRUTH TABLE

X : Don’t Care

Z : High Impedance

NOTE: Outputs are latched at the time when the input is taken LOW logic level

LOGIC DIAGRAM

This logic diagram has not be used to estimate propagation delays

PIN No

SYMBOL

NAME AND FUNCTION

1OE

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

INPUTS

OUTPUT

OE

LE

D

Q

H

XXZ

L

L

X

NO CHANGE

LHL

L

LH

H

H