Description
74688
8-bit magnitude comparator
Pin
Symbol
Description
1
E
enable (active low)
2
P
0
word input
3
Q
0
word input
4
P
1
word input
5
Q
1
word input
6
P
2
word input
7
Q
2
word input
8
P
3
word input
9
Q
3
word input
10
GND
ground
11
P
4
word input
12
Q
4
word input
13
P
5
word input
14
Q
5
word input
15
P
6
word input
16
Q
6
word input
17
P
7
word input
18
Q
7
word input
19
P=Q
equal-to output (low when P = Q)
20
Vcc
supply voltage
Specifications
(typical values under recommended operating conditions, unless specified)
Parameter
Value
Unit
Propagation delay, P
n
, Q
n
to
P=Q
17 (74HC/HCT)
ns
Propagation delay,
E
to
P=Q
8 (74HC)
12 (74HCT)
ns
Features:
Designed to Perform Comparisons Between Two 8-bit Binary or BCD Words
Totem Pole Output
Provides Equal Comparison Result
Operating Temperature up to 70oC
Standard TTL Switching Voltages
VCC Supply Voltage 5.0V
TA Operating Ambient Temperature Range 0-70°C
IOH Output Current — High –0.4mA
IOL Output Current — Low 24mA
Datasheet
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