SN54/74LS682
SN54/74LS684
SN54/74LS688
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 kΩ pullup resistor on the Q inputs for analog or switch data.
8-BIT MAGNITUDE
COMPARATORS
LOW POWER SCHOTTKY
CONNECTION DIAGRAMS (TOP VIEW)
VCC P=Q
20 19
Q7
P7
Q6
P6
Q5
P5
Q4
P4
18
17
16
15
14
13
12
11
J SUFFIX
CERAMIC
CASE 732-03
20
1
SN54/74LS682/684
1
P>Q
2
P0
3
Q0
VCC P=Q
20 19
4
P1
5
Q1
6
P2
7
Q2
8
P3
9
Q3
10
GND
Q7
P7
Q6
P6
Q5
P5
Q4
P4
18
17
16
15
14
13
12
N SUFFIX
PLASTIC
CASE 738-03
11
20
1
1
SN54/74LS688
1
G
2
P0
3
Q0
4
P1
5
Q1
6
P2
7
Q2
DW SUFFIX
SOIC
CASE 751D-03
20
ORDERING INFORMATION
8
P3
9
Q3
SN54LSXXXJ
Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
10
GND
FUNCTION TABLE
INPUTS
P=Q
P>Q
OUTPUT
ENABLE
LS682
yes
yes
no
totem-pole
yes
LS684
yes
yes
no
totem-pole
no
LS688
yes
no
yes
totem-pole
no
TYPE
OUTPUT
CONFIGURATION
DATA
PULLUP
OUTPUTS
ENABLES
P, Q
G, GT
G2
P=Q
P>Q
P=Q
L
L
L
H
P>Q
L
L
H
L
P
