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 k
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: V
CC
= 2 to 6 V
Low Input Current: 1 A max
Low Quiescent Supply Current: I
CC
(static) = 4 A max (Ta = 25C)
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
4
DC Characteristics
Ta = 25
C
Ta = 40 to
+85
C
Item
Symbol
V
CC
(V) Min Typ Max Min
Max
Unit
Test Conditions
Input voltage
V
IH
2.0
1.5
--
--
1.5
--
V
4.5
3.15 --
--
3.15
--
6.0
4.2
--
--
4.2
--
V
IL
2.0
--
--
--
0.5
--
V
4.5
--
--
1.35 --
1.35
6.0
--
--
1.8
--
1.8
Output voltage
V
OH
2.0
1.9
2.0
--
1.9
--
V
Vin = V
IH
or V
IL
I
OH
= 20
A
4.5
4.4
4.5
--
4.4
--
6.0
5.9
6.0
--
5.9
--
4.5
4.18 --
--
4.13
--
I
OH
= 4 mA
6.0
5.68 --
--
5.63
--
I
OH
= 5.2 mA
V
OL
2.0
--
0.0
0.1
--
0.1
V
Vin = V
IH
or V
IL
I
OL
= 20
A
4.5
--
0.0
0.1
--
0.1
6.0
--
0.0
0.1
--
0.1
4.5
--
--
0.26 --
0.33
I
OL
= 4 mA
6.0
--
--
0.26 --
0.33
I
OL
= 5.2 mA
Input current
(HC684)
Iin
6.0
--
--
0.1 --
1.0
A
Vin = V
CC
or GND
Quiescent supply
current (HC684)
I
CC
6.0
--
--
4.0
--
40
A
Vin = V
CC
or GND, Iout = 0
A
Input current
Iin
6.0
--
--
0.1 --
1.0
A
Vin = V
CC
(HD682)
0.6
0.7
mA
Iin = GND
Quescent supply
current (HC682)
I
CC
6.0
--
--
4.8
--
5.6
mA
Qn = GND, other inputs = V
CC
or GND Iout = 0
A
--
--
4.0
--
40
A
Qn = VCC, other inputs = V
CC
or GND Iout = 0
A
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