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

CONNECTION DIAGRAMS

(TOP VIEW)

SN54/74LS682

SN54/74LS684

SN54/74LS688

8-BIT MAGNITUDE

COMPARATORS

LOW POWER SCHOTTKY

VCC P=Q

20

19

Q7

18

P7

17

Q6

16

P6

15

Q5

14

P5

13

Q4

12

P4

11

20

1

J SUFFIX

CERAMIC

CASE 732-03

SN54/74LS682/684

N SUFFIX

PLASTIC

CASE 738-03

1

1

P>Q

2

P0

3

Q0

4

P1

5

Q1

6

P2

7

Q2

8

P3

9

Q3

10

GND

20

VCC P=Q

20

19

Q7

18

P7

17

Q6

16

P6

15

Q5

14

P5

13

Q4

12

P4

11

20

1

DW SUFFIX

SOIC

CASE 751D-03

SN54/74LS688

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN Plastic

SN74LSXXXDW SOIC

1

G

2

P0

3

Q0

4

P1

5

Q1

6

P2

7

Q2

8

P3

9

Q3

10

GND

FUNCTION TABLE

INPUTS

TYPE

LS682

LS684

LS688

P=Q

yes

yes

yes

P>Q

yes

yes

no

OUTPUT

ENABLE

no

no

yes

OUTPUT

CONFIGURATION

totem-pole

totem-pole

totem-pole

DATA

PULLUP

yes

no

no

P, Q

P=Q

P>Q

P<Q

X

ENABLES

G, GT

L

L

L

H

G2

L

L

L

H

P=Q

L

H

H

H

P>Q

H

L

H

H

OUTPUTS

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

FAST AND LS TTL DATA

5-603

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