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
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
SN54/74LS682
•
SN54/74LS684
•
SN54/74LS688
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
IOH
IOL
Supply Voltage
Operating Ambient Temperature Range
Output Current — High
Output Current — Low
Parameter
54
74
54
74
54, 74
54
74
Min
4.5
4.75
– 55
0
Typ
5.0
5.0
25
25
Max
5.5
5.25
125
70
–0.4
12
24
Unit
V
°C
mA
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
VIH
VIL
VIK
VOH
Parameter
Input HIGH Voltage
54
Input LOW Voltage
74
Input Clamp Diode Voltage
54
Output HIGH Voltage
74
54, 74
VOL
Output LOW Voltage
74
0.35
0.5
20
IIH
Input HIGH Current
LS628-Q Inputs
Others
LS682-Q Inputs
IIL
IOS
Input LOW Current
Others
Short Circuit Current (Note 1)
LS682
ICC
Power Supply
Current
LS684
LS688
– 30
– 0.2
– 130
70
65
65
mA
mA
mA
mA
mA
VCC = MAX
0.1
0.1
– 0.4
V
µA
mA
mA
mA
VCC = MAX, VIN = 0.4 V
VCC = MAX
2.7
3.5
0.25
0.4
V
V
2.5
– 0.65
3.5
0.8
– 1.5
V
V
Min
2.0
0.7
V
Typ
Max
Unit
V
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
VCC = MIN, IIN = – 18 mA
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
IOL = 12 mA
IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VCC = MAX, VIN = 2.7 V
VCC = MAX, VIN = 5.5 V
VCC = MAX, VIN = 7.0 V
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
5-604
SN54/74LS682
•
SN54/74LS684
•
SN54/74LS688
LOGIC DIAGRAMS
P7
Q7
P6
Q6
P5
Q5
P4
Q4
P3
Q3
P2
Q2
P1
Q1
P0
Q0
(17)
(18)
P7
(15)
(16)
(13)
(14)
(11)
(12)
(8)
(9)
(6)
(7)
(4)
(5)
(2)
(3)
(19)
(17)
(18)
Q7
(15)
P6
Q6
(16)
P = Q
P5
(13)
Q5
(14)
P4
(11)
Q4
(12)
(19)
P3
(8)
P = Q
(9)
Q3
P2
(6)
Q2
(7)
P1
(4)
Q1
(1)
(5)
P > Q
P0
(2)
Q0
(3)
G
(1)
SN54 / 74LS682 thru LS684
SN54 / 74LS688
FAST AND LS TTL DATA
5-605
SN54/74LS682•SN54/74LS684•SN54/74LS688
AC CHARACTERISTICS
(TA = 25°C)
SN54/74LS682
Limits
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay, P to P = Q
Propagation Delay, Q to P = Q
Propagation Delay, P to P > Q
Propagation Delay, Q to P > Q
Min
Typ
13
15
14
15
20
15
21
19
Max
25
25
25
25
30
30
30
30
Unit
ns
ns
ns
ns
Test Conditions
VCC = 5.0 V
CL = 45 pF
RL = 667
Ω
SN54/74LS684
Limits
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay, P to P = Q
Propagation Delay, Q to P = Q
Propagation Delay, P to P > Q
Propagation Delay, Q to P > Q
Min
Typ
15
17
16
15
22
17
24
20
Max
25
25
25
25
30
30
30
30
Unit
ns
ns
ns
ns
Test Conditions
VCC = 5.0 V
CL = 45 pF
RL = 667
Ω
SN54/74LS688
Limits
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay, P to P = Q
Propagation Delay, Q to P = Q
Propagation Delay, G , G1 to P = Q
Min
Typ
12
17
12
17
12
13
Max
18
23
18
23
18
20
Unit
ns
ns
ns
VCC = 5.0 V
CL = 45 pF
RL = 667
Ω
Test Conditions
FAST AND LS TTL DATA
5-606
Case 751D-03 DW Suffix
20-Pin Plastic
SO-20 (WIDE)
-A-
20
11
NOTES:
1.
DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2.
3.
CONTROLLING DIMENSION: MILLIMETER.
DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4.
MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
-B-
1
10
P
0.25 (0.010)
M
B
M
5.
751D 01, AND 02 OBSOLETE, NEW STANDARD
751D 03.
10 PL
G
R X 45°
-T-
C
K
M
SEATING
PLANE
M
D
20 PL
0.25 (0.010)
T
B
S
F
J
DIM
A
B
C
D
F
G
J
K
M
P
R
MILLIMETERS
MIN
MAX
12.65
7.40
2.35
0.35
0.50
12.95
7.60
2.65
0.49
0.90
INCHES
MIN
MAX
0.499
0.292
0.093
0.014
0.020
0.510
0.299
0.104
0.019
0.035
1.27 BSC
0.25
0.10
0
0.32
0.25
7
0.050 BSC
0.010
0.004
0
0.012
0.009
7
°
°
°
°
10.05
0.25
10.55
0.75
0.395
0.010
0.415
0.029
A
S
Case 732-03 J Suffix
20-Pin Ceramic Dual In-Line
NOTES:
1.
LEADS WITHIN 0.25 mm (0.010) DIA., TRUE
POSITION AT SEATING PLANE, AT MAXIMUM
20
1
11
2.
MATERIAL CONDITION.
DIM L TO CENTER OF LEADS WHEN FORMED
PARALLEL.
10
3.
DIM A AND B INCLUDES MENISCUS.
B
A
F
C
L
N
H
D
SEATING
PLANE
J
M
G
K
DIM
A
B
C
D
F
G
H
J
K
L
M
N
MILLIMETERS
MIN
MAX
23.88
6.60
3.81
0.38
1.40
25.15
7.49
5.08
0.56
1.65
INCHES
MIN
MAX
0.940
0.260
0.150
0.015
0.055
0.990
0.295
0.200
0.022
0.065
2.54 BSC
0.51
0.20
3.18
1.27
0.30
4.06
0.100 BSC
0.020
0.008
0.125
0.050
0.012
0.160
7.62 BSC
0
°
15
°
0.300 BSC
0
°
15
°
0.25
1.02
0.010
0.040
Case 738-03 N Suffix
20-Pin Plastic
-A-
20
1
11
10
NOTES:
1.
DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2.
3.
CONTROLLING DIMENSION: INCH.
DIMENSION L" TO CENTER OF LEAD WHEN
FORMED PARALLEL.
B
C
L
4.
DIMENSION B" DOES NOT INCLUDE MOLD
FLASH.
5.
738 02 OBSOLETE, NEW STANDARD 738 03.
-T-
SEATING
PLANE
K
E
G
F
D
20 PL
0.25 (0.010)
M
N
M
J
20 PL
0.25 (0.010)
T
A
M
M
T
B
M
DIM
A
B
C
D
E
F
G
J
K
L
M
N
MILLIMETERS
MIN
MAX
25.66
6.10
3.81
0.39
27.17
6.60
4.57
0.55
INCHES
MIN
MAX
1.010
0.240
0.150
0.015
1.070
0.260
0.180
0.022
1.27 BSC
1.27
1.77
0.050 BSC
0.050
0.070
2.54 BSC
0.21
2.80
0.38
3.55
0.100 BSC
0.008
0.110
0.015
0.140
7.62 BSC
0
°
15
°
0.300 BSC
0
°
15
°
0.51
1.01
0.020
0.040
FAST AND LS TTL DATA
5-607
PCB设计
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