MOTOROLA SN74LS688DW, SN74LS688DWR2, SN74LS684DWR2, SN74LS684H, SN74LS684MEL Datasheet
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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.
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OUTPUT |
OUTPUT |
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ENABLE |
CONFIGURATION |
PULLUP |
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P = Q |
P > Q |
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LS682 |
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yes |
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yes |
no |
totem-pole |
yes |
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LS684 |
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yes |
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yes |
no |
totem-pole |
no |
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LS688 |
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yes |
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no |
yes |
totem-pole |
no |
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GUARANTEED OPERATING RANGES
Symbol |
Parameter |
Min |
Typ |
Max |
Unit |
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VCC |
Supply Voltage |
4.75 |
5.0 |
5.25 |
V |
TA |
Operating Ambient |
0 |
25 |
70 |
°C |
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Temperature Range |
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IOH |
Output Current ± High |
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± 0.4 |
mA |
IOL |
Output Current ± Low |
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24 |
mA |
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LOW
POWER
SCHOTTKY
20 
1
PLASTIC
N SUFFIX
CASE 738
20
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SOIC
DW SUFFIX
CASE 751D
ORDERING INFORMATION
Device |
Package |
Shipping |
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SN74LS682N |
16 Pin DIP |
1440 Units/Box |
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SN74LS682DW |
16 Pin |
2500/Tape & Reel |
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SN74LS684N |
16 Pin DIP |
1440 Units/Box |
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SN74LS684DW |
16 Pin |
2500/Tape & Reel |
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SN74LS688N |
16 Pin DIP |
1440 Units/Box |
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SN74LS688DW |
16 Pin |
2500/Tape & Reel |
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Semiconductor Components Industries, LLC, 1999 |
1 |
Publication Order Number: |
December, 1999 ± Rev. 6 |
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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
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8 |
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P0 |
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Q0 |
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P1 |
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Q1 |
P2 |
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Q2 |
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P3 |
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Q3 |
GND |
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P>Q |
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VCC |
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Q7 |
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P7 |
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Q6 |
P6 |
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Q5 |
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P5 |
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Q4 |
P4 |
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P=Q |
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20 |
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19 |
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18 |
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14 |
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12 |
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11 |
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SN74LS688 |
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P0 |
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Q0 |
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P1 |
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Q1 |
P2 |
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Q2 |
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P3 |
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Q3 |
GND |
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G |
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FUNCTION TABLE
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INPUTS |
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OUTPUTS |
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DATA |
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ENABLES |
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P, Q |
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G, GT |
G2 |
P = Q |
P > Q |
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P = Q |
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L |
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L |
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L |
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H |
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P > Q |
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L |
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L |
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H |
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L |
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P < Q |
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L |
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L |
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H |
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H |
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X |
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H |
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H |
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H |
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H |
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H = HIGH Level, L = LOW Level, X = Irrelevant
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2
SN74LS682 SN74LS684 SN74LS688
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
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Limits |
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Symbol |
Parameter |
Min |
Typ |
Max |
Unit |
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Test Conditions |
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VIH |
Input HIGH Voltage |
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2.0 |
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V |
Guaranteed Input HIGH Voltage for |
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All Inputs |
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VIL |
Input LOW Voltage |
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0.8 |
V |
Guaranteed Input LOW Voltage for |
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All Inputs |
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VIK |
Input Clamp Diode Voltage |
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± 0.65 |
± 1.5 |
V |
VCC = MIN, IIN = ± 18 mA |
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VOH |
Output HIGH Voltage |
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2.7 |
3.5 |
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V |
VCC = MIN, IOH = MAX, VIN = VIH |
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or VIL per Truth Table |
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0.25 |
0.4 |
V |
I = 12 mA |
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VCC = VCC MIN, |
VOL |
Output LOW Voltage |
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OL |
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VIN = VIL or VIH |
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0.35 |
0.5 |
V |
IOL = 24 mA |
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per Truth Table |
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20 |
μA |
VCC = MAX, VIN = 2.7 V |
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IIH |
Input HIGH Current |
LS682-Q Inputs |
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0.1 |
mA |
VCC = MAX, VIN = 5.5 V |
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Others |
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0.1 |
mA |
VCC = MAX, VIN = 7.0 V |
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IIL |
Input LOW Current |
LS682-Q Inputs |
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± 0.4 |
mA |
VCC = MAX, VIN = 0.4 V |
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Others |
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± 0.2 |
mA |
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IOS |
Short Circuit Current (Note 1) |
± 30 |
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± 130 |
mA |
VCC = MAX |
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LS682 |
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70 |
mA |
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Power Supply |
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ICC |
LS684 |
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65 |
mA |
VCC = MAX |
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Current |
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LS688 |
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65 |
mA |
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Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
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3
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