5-603

FAST AND LS TTL DATA

8-BIT MAGNITUDE

COMPARATORS

The SN54 / 74LS682, 684, 688 are 8-bit magnitude comparators. These

device types are designed to perform comparisons between two eight-bit

binary or BCD words. All device types provide P = Q outputs and the LS682

and LS684 have P>Q outputs also.

The LS682, LS684 and LS688 are totem pole devices. The LS682 has a

20 k

Ω pullup resistor on the Q inputs for analog or switch data.

CONNECTION DIAGRAMS (TOP VIEW)

SN54/74LS682/684

18

17

16

15

14

13

1

2

3

4

5

6

7

20

19

8

VCC

P>Q

P=Q Q7 P7 Q6

Q5

P6

P5

P0 Q0

P1 Q1

P2

Q2 P3

9

10

Q3 GND

12

11

Q4

P4

SN54/74LS688

18

17

16

15

14

13

1

2

3

4

5

6

7

20

19

8

VCC

G

P=Q Q7 P7 Q6

Q5

P6

P5

P0 Q0

P1 Q1

P2

Q2 P3

9

10

Q3 GND

12

11

Q4

P4

TYPE

P = Q

P > Q

OUTPUT

ENABLE

OUTPUT

CONFIGURATION

PULLUP

TYPE

P = Q

P > Q

OUTPUT

ENABLE

OUTPUT

CONFIGURATION

PULLUP

LS682

yes

yes

no

totem-pole

yes

LS684

yes

yes

no

totem-pole

no

LS688

yes

no

yes

totem-pole

no

SN54/74LS682

SN54/74LS684

SN54/74LS688

8-BIT MAGNITUDE

COMPARATORS

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXDW SOIC

20

1

J SUFFIX

CERAMIC

CASE 732-03

20

1

N SUFFIX

PLASTIC

CASE 738-03

20

1

DW SUFFIX

SOIC

CASE 751D-03

FUNCTION TABLE

INPUTS

OUTPUTS

DATA

ENABLES

P, Q

G, GT

G2

P = Q

P > Q

P = Q

P > Q

P < Q

X

L

L

L

H

L

L

L

H

L

H

H

H

H

L

H

H

H = HIGH Level, L = LOW Level, X = Irrelevant