M74HC688

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INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

TRUTH TABLE

X: Don’t Care

LOGIC DIAGRAM

This logic diagram has not be used to estimate propagation delays

PIN No

SYMBOL

NAME AND FUNCTION

1G

Enable Input (Active

LOW)

2, 4, 6, 8, 11,

13, 15, 17

P0 to P7

Word Inputs

3, 5, 7, 9, 12,

14, 16, 18

Q0 to Q7

Word Outputs

19

P = Q

Equal to Output

10

GND

Ground (0V)

20

Positive Supply Voltage

INPUTS

OUTPUT

P, Q

G

P = Q

P = Q

L

L

P <> Q

L

H

XH

H