Page 1
8-BIT MAGNITUDE
OUTPUT
OUTPUT
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
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)
outputs and the LS682
SN54/74LS682
SN54/74LS684
SN54/74LS688
8-BIT MAGNITUDE
COMPARATORS
LOW POWER SCHOTTKY
P=Q Q7 P7 Q6 Q5P6 P5
V
CC
20 19
18 17 16 15 14 13
Q4 P4
12 11
SN54/74LS682/684
123456
P0 Q0 P1 Q1 P2 Q2 P3
P>Q
P=Q Q7 P7 Q6 Q5P6 P5
V
CC
20 19
18 17 16 15 14 13
7
8
Q4 P4
910
Q3 GND
12 11
SN54/74LS688
8
123456
P0 Q0 P1 Q1 P2 Q2 P3
G
OUTPUT OUTPUT
TYPE P = Q P > Q
LS682 yes yes no totem-pole yes
LS684 yes yes no totem-pole no
LS688 yes no yes totem-pole no
ENABLE
7
CONFIGURATION
910
Q3 GND
PULLUP
20
1
20
1
20
1
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
FUNCTION TABLE
INPUTS OUTPUTS
DATA ENABLES
P, Q G
P = Q
P > Q
P < Q
X
, GT G2 P = Q P > Q
L
L
L
H
H
CASE 732-03
CASE 738-03
CASE 751D-03
L
L
L
J SUFFIX
CERAMIC
N SUFFIX
PLASTIC
DW SUFFIX
SOIC
L
H
H
H
H
L
H
H
H = HIGH Level, L = LOW Level, X = Irrelevant
FAST AND LS TTL DAT A
5-1
Page 2
SN54/74LS682 • SN54/74LS684 • SN54/74LS688
VILI
LOW Volt
V
pg
VOHOutput HIGH Volt
CC
,
OH
,
IN IH
VOLOutput LOW Volt
V
V
V
IILI
LOW C
t
V
MAX, V
V
Current
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
CC
T
A
I
OH
I
OL
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol Parameter
V
IH
V
IK
I
IH
I
OS
I
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
Supply Voltage 54
Operating Ambient Temperature Range 54
Output Current — High 54, 74 –0.4 mA
Output Current — Low 54
Limits
Min Typ Max
Input HIGH Voltage 2.0 V
nput
Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
Input HIGH Current
nput
Short Circuit Current (Note 1) –30 –130 mA VCC = MAX
Power Supply
Current
age
urren
age
age
LS628-Q Inputs 0.1 mA VCC = MAX, VIN = 5.5 V
Others 0.1 mA VCC = MAX, VIN = 7.0 V
LS682-Q Inputs –0.4 mA
Others –0.2 mA
LS682 70 mA
LS684 65 mA
LS688 65 mA
54 0.7
74 0.8
54 2.5 3.5 V
74 2.7 3.5 V
54, 74 0.25 0.4 V IOL = 12 mA
74 0.35 0.5 V IOL = 24 mA
74
74
74
20 µA VCC = MAX, VIN = 2.7 V
4.5
4.75
–55
0
Unit Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
VCC = MIN, IOH = MAX, VIN = V
or VIL per Truth Table
CC
VCC = MAX
=
5.0
5.0
25
25
IN
= 0.4
5.5
5.25
125
70
12
24
VCC = VCC MIN,
=
IN
IL
per Truth Table
or
IH
IH
V
°C
mA
FAST AND LS TTL DATA
5-2
Page 3
P7
Q7
P6
Q6
P5
Q5
P4
Q4
P3
Q3
P2
Q2
P1
Q1
P0
Q0
(17)
(18)
(15)
(16)
(13)
(14)
(11)
(12)
(8)
(9)
(6)
(7)
(4)
(5)
(2)
(3)
SN54/74LS682 • SN54/74LS684 • SN54/74LS688
LOGIC DIAGRAMS
(17)
P7
(18)
Q7
(15)
P6
(16)
P > Q
Q6
P5
Q5
P4
Q4
P3
Q3
P2
Q2
P1
Q1
P0
Q0
(13)
(14)
(11)
(12)
(8)
(9)
(6)
(7)
(4)
(5)
(2)
(3)
(19)
P = Q
(1)
(19)
P = Q
(1)
G
SN54/74LS682 thru LS684 SN54/74LS688
FAST AND LS TTL DATA
5-3
Page 4
SN54/74LS682•SN54/74LS684•SN54/74LS688
C
F
C
45 pF
R
L
667 Ω
AC CHARACTERISTICS (T
SN54/74LS682
Symbol Parameter
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay, P to P = Q
Propagation Delay, Q to P = Q
Propagation Delay, P to P > Q
Propagation Delay, Q to P > Q
SN54/74LS684
Symbol Parameter
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay, P to P = Q
Propagation Delay, Q to P = Q
Propagation Delay, P to P > Q
Propagation Delay, Q to P > Q
SN54/74LS688
Symbol Parameter
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Propagation Delay, P to P = Q
Propagation Delay, Q to P = Q
Propagation Delay, G , G1 to P = Q
= 25°C)
A
Limits
Min Typ Max
13
15
14
15
20
15
21
19
Limits
Min Typ Max
15
17
16
15
22
17
24
20
Limits
Min Typ Max
12
17
12
17
12
13
25
25
25
25
30
30
30
30
25
25
25
25
30
30
30
30
18
23
18
23
18
20
Unit Test Conditions
ns
ns
ns
ns
Unit Test Conditions
ns
ns
ns
ns
Unit Test Conditions
ns
ns
ns
VCC = 5.0 V
= 45 p
L
RL = 667 Ω
VCC = 5.0 V
=
L
RL = 667 Ω
VCC = 5.0 V
CL = 45 pF
=
R
= 667 Ω
FAST AND LS TTL DATA
5-4
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