HIT HD74HC684, HD74HC682 Datasheet
HD74HC682/HD74HC684
8-bit Magnitude Comparator
Description
These magnitude comparators perform comparisons of two eight-bit binary or BCD words. All types
provide P=Q outputs and provide P>Q outputs. The HD74HC682 features 20 k pullup termination
resistors on the Q inputs for analog or switch data.
Type P=Q P>Q Output Enable 20 kΩ Pullup
HD74HC682 Yes Yes No Yes
HD74HC684 Yes Yes No No
Features
• High Speed Operation
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Input
Data Outputs
P, Q P=Q P>Q
P=Q L H
P>Q H L
P<Q H H
Note: 1. The P<Q function can be generated by applying the P=Q and P>Q Outputs to a 2-input NAND
gate.
HD74HC682/HD74HC684
Q
Pin Arrangement
HD74HC682/HD74HC684
P>Q
P
0
1
2
20
19
V
P=
CC
Q
P
Q
P
Q
P
Q
GND
3
0
4
1
5
1
6
2
7
2
8
3
9
3
10
18
17
16
15
14
13
12
11
Q
7
P
7
Q
6
P
6
Q
5
P
5
Q
4
P
4
(Top view)
2
Logic Diagram
HD74HC682/HD74HC684
P
Q
P
Q
P
Q
P
Q
P
Q
P
Q
P
HD74HC682/HD74HC684
0
0
1
1
2
2
3
3
4
4
5
5
6
V
CC
V
CC
P=Q
P>Q
Q
6
P
7
Q
7
V
CC
3
Loading...