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
18 17 16 15 14 13
1 2 3 4 5 6 7
20 19
8
VCC
P>Q
P=Q Q7 P7 Q6 Q5P6 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 Q5P6 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
5-604
FAST AND LS TTL DATA
SN54/74LS682 • SN54/74LS684 • SN54/74LS688
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
IOH Output Current — High 54, 74 –0.4 mA
IOL Output Current — Low 54
74 12
24 mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
54 0.7
V
Guaranteed Input LOW Voltage for
All Inputs
VIL
Input LOW Voltage
74 0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VOH
Output HIGH Voltage
54 2.5 3.5 V
V
CC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOH
Output HIGH Voltage
74 2.7 3.5 V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOL
Output LOW Voltage
54, 74 0.25 0.4 V IOL = 12 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VOL
Output LOW Voltage
74 0.35 0.5 V IOL = 24 mA
VIN = VIL or VIH
per Truth Table
IIH
Input HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
IIH Input HIGH Current
LS628-Q Inputs 0.1 mA VCC = MAX, VIN = 5.5 V
IH
Others 0.1 mA VCC = MAX, VIN = 7.0 V
IIL
Input LOW Current
LS682-Q Inputs –0.4 mA
VCC = MAX, VIN = 0.4 V
IIL
Input LOW Current
Others –0.2 mA
VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current (Note 1) –30 –130 mA VCC = MAX
ICC
Power Supply
Current
LS682 70 mA
VCC = MAX
ICC
Power Supply
Current
LS684 65 mA
VCC = MAX
CC
Current
LS688 65 mA
CC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
5-605
FAST AND LS TTL DATA
SN54/74LS682 • SN54/74LS684 • SN54/74LS688
LOGIC DIAGRAMS
SN54/74LS682 thru LS684 SN54/74LS688
5-606
FAST AND LS TTL DATA
SN54/74LS682•SN54/74LS684•SN54/74LS688
AC CHARACTERISTICS (TA = 25°C)
SN54/74LS682
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPLH
tPHL Propagation Delay, P to P = Q 13
15 25
25 ns
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
tPLH
tPHL Propagation Delay, Q to P = Q 14
15 25
25 ns
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
tPLH
tPHL Propagation Delay, P to P > Q 20
15 30
30 ns
CL = 45 pF
RL = 667 Ω
tPLH
tPHL Propagation Delay, Q to P > Q 21
19 30
30 ns
SN54/74LS684
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPLH
tPHL Propagation Delay, P to P = Q 15
17 25
25 ns
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
tPLH
tPHL Propagation Delay, Q to P = Q 16
15 25
25 ns
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
tPLH
tPHL Propagation Delay, P to P > Q 22
17 30
30 ns
CL = 45 pF
RL = 667 Ω
tPLH
tPHL Propagation Delay, Q to P > Q 24
20 30
30 ns
SN54/74LS688
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPLH
tPHL Propagation Delay, P to P = Q 12
17 18
23 ns
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
tPLH
tPHL Propagation Delay, Q to P = Q 12
17 18
23 ns
VCC = 5.0 V
CL = 45 pF
RL = 667 Ω
tPLH
tPHL Propagation Delay, G , G1 to P = Q 12
13 18
20 ns
RL = 667 Ω
5-607
FAST AND LS TTL DATA
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20-Pin Plastic
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5-608
FAST AND LS TTL DATA
SYMBOL SW1 SW2
tPZH Open Closed
tPZL Closed Open
tPLZ Closed Closed
tPHZ Closed Closed
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