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 kΩ pullup resistor on the Q inputs for analog or switch data.
CONNECTION DIAGRAMS (TOP VIEW)
SN54/74LS682/684
C0049C0056 C0049C0055 C0049C0054 C0049C0053 C0049C0052 C0049C0051
C0049 C0050 C0051 C0052 C0053 C0054 C0055
C0050C0048 C0049C0057
C0056
C0086
C0067C0067
C0080C0062C0081
C0080C0061C0081 C0081C0055 C0080C0055 C0081C0054 C0081C0053C0080C0054 C0080C0053
C0080C0048 C0081C0048 C0080C0049 C0081C0049 C0080C0050 C0081C0050 C0080C0051
C0057 C0049C0048
C0081C0051 C0071C0078C0068
C0049C0050 C0049C0049
C0081C0052 C0080C0052
SN54/74LS688
C0049C0056 C0049C0055 C0049C0054 C0049C0053 C0049C0052 C0049C0051
C0049 C0050 C0051 C0052 C0053 C0054 C0055
C0050C0048 C0049C0057
C0056
C0086
C0067C0067
C0071
C0080C0061C0081 C0081C0055 C0080C0055 C0081C0054 C0081C0053C0080C0054 C0080C0053
C0080C0048 C0081C0048 C0080C0049 C0081C0049 C0080C0050 C0081C0050 C0080C0051
C0057 C0049C0048
C0081C0051 C0071C0078C0068
C0049C0050 C0049C0049
C0081C0052 C0080C0052
TYPE P = Q P > Q
OUTPUT
ENABLE
OUTPUT
CONFIGURATION PULLUPP = Q
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