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 k 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 PQ H L H H OUTPUTS
H = HIGH Level, L = LOW Level, X = Irrelevant
FAST AND LS TTL DATA 5-1
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 S bl VIH VIL VIK VOH Parameter P 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 C I 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 A mA mA mA VCC = MAX VIN = 0 4 V MAX, 0.4 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 Ui V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g 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 5-2
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) (15) (16) (13) (14) (11) (12) (8) (9) (6) (7) (4) (5) (2) (3) (19)
P7 Q7 P6 Q6 P5 Q5 P4 Q4 P3 Q3 P2 Q2 P1
(1)
(17) (18) (15) (16) (13) (14) (11) (12) (8) (9) (6) (7) (4) (5) (2) (3)
(19)
P=Q
P=Q
Q1 P0 Q0
P>Q
G
(1)
SN54 / 74LS682 thru LS684
SN54 / 74LS688
FAST AND LS TTL DATA 5-3
SN54/74LS682*SN54/74LS684*SN54/74LS688
AC CHARACTERISTICS (TA = 25C) SN54/74LS682
Limits Symbol S bl tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Parameter P 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 Ui ns ns ns ns Test C di i T Conditions
VCC = 5.0 V 50 CL = 45 pF RL = 667
SN54/74LS684
Limits Symbol S bl tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Parameter P 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 Ui ns ns ns ns Test C di i T Conditions
VCC = 5.0 V 50 CL = 45 pF RL = 667
SN54/74LS688
Limits Symbol S bl tPLH tPHL tPLH tPHL tPLH tPHL Parameter P 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 Ui ns ns ns VCC = 5.0 V 50 CL = 45 pF RL = 667 Test C di i T Conditions
FAST AND LS TTL DATA 5-4
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