Document
SN74LS682, SN74LS684, SN74LS688
8−Bit Magnitude Comparators
The SN74LS682, 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.
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
PULLUP yes no no
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min Typ Max Unit
VCC
Supply Voltage
TA
Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0
25
70
°C
IOH
Output Current − High
IOL
Output Current − Low
− 0.4 mA
24
mA
http://onsemi.com
LOW POWER SCHOTTKY
MARKING DIAGRAMS
20 1
PDIP−20 N SUFFIX CASE 738
SN74LS68xN AWLYYWW
1
20
LS68x
SOIC−20 1 DW SUFFIX
AWLYYWW
CASE 751D
x = 2, 4, or 8 A = Assembly L1ocation WL = Wafer Lot YY = Year WW = Work Week
ORDERING INFORMATION
Device
Package
Shipping
SN74LS682N
PDIP−20 1440 Units/Box
SN74LS682DW SOIC−WIDE 38 Units/Rail
SN74LS682DWR2 SOIC−WIDE 2500/Tape & Reel
SN74LS684N
PDIP−20 1440 Units/Box
SN74LS684DW SOIC−WIDE 38 Units/Rail
SN74LS684DWR2 SOIC−WIDE 2500/Tape & Reel
SN74LS688N
PDIP−20 1440 Units/Box
SN74LS688DW SOIC−WIDE 38 Units/Rail
SN74LS688DWR2 SOIC−WIDE 2500/Tape & Reel
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 9
Publication Order Number: SN74LS682/D
SN74LS682, SN74LS684, SN74LS688
CONNECTION DIAGRAMS (TOP VIEW) VCC P=Q Q7 P7 Q6 P6 Q5 P5 Q4 P4 20 19 18 17 16 15 14 13 12 11
SN74LS682/684
1 2 3 4 5 6 7 8 9 10 P>Q P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND
VCC P=Q Q7 P7 Q6 P6 Q5 P5 Q4 P4 20 19 18 17 16 15 14 13 12 11
SN74LS688
1 2 3 4 5 6 7 8 9 10 G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND
FUNCTION TABLE
INPUTS
OUTPUTS
DATA
ENABLES
P, Q
G, GT G2 P = Q P > Q
P=Q P>Q P Q P0 (2)
Q0 (3)
SN74LS682 and LS684
G (1)
SN74LS688
(19) P=Q
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SN74LS682, SN74LS684, SN74LS688
AC CHARACTERISTICS (TA = 25°C) SN74LS682
Limits
Symbol
Parameter
Min Typ Max Unit
tPLH tPHL
Propagation Delay, P to P = Q
tPLH tPHL
Propagation Delay, Q to P = Q
tPLH tPHL
Propagation Delay, P to P > Q
13 15
25 25
ns
14 15
25 25
ns
20 15
30 30
ns
tPLH tPHL
Propagation Delay, Q to P > Q
21 19
30 30
ns
SN74LS684
Limits
Symbol
tPLH tPHL
Parameter Propagation Delay, P to P = Q
Min Typ Max Unit
15 17
25 25
ns
tPLH tPHL
Propagation Delay, Q to P = Q
tPLH tPHL
Propagation Delay, P to P > Q
tPLH tPHL
Propagation Delay, Q to P > Q
16 15
25 25
ns
22 17
30 30
ns
24 20
30 30
ns
SN74LS688
Limits
Symbol
tPLH tPHL
tPLH tPHL
Parameter Propagation Delay, P to P = Q Propagation Delay, Q to P = Q
Min Typ Max Unit
12 17
18 23
ns
12 17
18 23
ns
tPLH tPHL
Propagation Delay, G , G1 to P = Q
12
13
18 20
ns
Test Conditions
VCC = 5.0 V CL = 45 pF RL = 667 Ω
Test Conditions
VCC = 5.0 V CL = 45 pF RL = 667 Ω
Test Conditions VCC = 5.0 V CL = 45 pF RL = 667 Ω
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SN74LS682, SN74LS684, SN74LS688
PACKAGE DIMENSIONS
−A−
20 1
−T−
SEATING PLANE
E
G
F
N SUFFIX PLASTIC PACKAGE
CASE 738−03 ISSUE E
11
B
10
C
K N
D 20 PL 0.25 (0.010) M T A M
L
M J 20 PL
0.25 (0.010) M
TBM
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANS.