SN54ALS688, SN74ALS688

8-BIT IDENTITY COMPARATORS

SDAS228A – JUNE 1982 – REVISED JANUARY 1995

Copyright

1

POST OFFICE BOX 655303

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Standard Plastic (N)

and Ceramic (J) 300-mil DIPs

description

These identity comparators perform comparisons

on two 8-bit binary or BCD words and provide

P = Q outputs. These devices have totem-pole

outputs.

The SN54ALS688 is characterized for operation

over the full military temperature range of – 55

°C

to 125

°C. The SN74ALS688 is characterized for

operation from 0

°C to 70°C.

FUNCTION TABLE

INPUTS

OUTPUT

DATA

P, Q

ENABLE

G

OUTPUT

P = Q

P = Q

L

L

P > Q

LH

P < Q

LH

X

H

H

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

G

P0

Q0

P1

Q1

P2

Q2

P3

Q3

GND

P = Q

Q7

P7

Q6

P6

Q5

P5

Q4

P4

SN54ALS688 ...J PACKAGE

SN74ALS688 ... DW OR N PACKAGE

(TOP VIEW)

32 1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

Q7

P7

Q6

P6

Q5

P1

Q1

P2

Q2

P3

SN54ALS688 . . . FK PACKAGE

(TOP VIEW)

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.