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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)
VCC P=Q Q7 P7 Q6 P6 Q5 P5 Q4 P4 20 19 18 17 16 15 14 13 12 11
SN54/74LS682/684
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
SN54/74LS682 SN54/74LS684 SN54/74LS688
8-BIT MAGNITUDE COMPARATORS
LOW POWER SCHOTTKY
20 1
20 1
20 1
J SUFFIX CERAMIC CASE 732-03
N SUFFIX PLASTIC CASE 738-03
DW SUFFIX SOIC
CASE 751D-03
SN54/74LS688
1 2 3 4 5 6 7 8 9 10 G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND
TYPE LS682 LS684 LS688
P=Q yes yes yes
P>Q yes yes no
OUTPUT ENABLE
no no yes
OUTPUT CONFIGURATION totem-po.