MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
8-Bit Equality Comparator
High鈥揚erformance Silicon鈥揋ate CMOS
The MC54/74HC688 is identical in pinout to the LS688. The device inputs
are compatible with standard CMOS outputs; with pullup resistors, they are
compatible with LSTTL outputs.
The HC688 compares two 8鈥揵it binary or BCD words and indicates
whether or not they are equal. By using the Cascade Input, two or more of
the devices may be cascaded to compare words of more than 8 bits.
鈥?/div>
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鈥?/div>
鈥?/div>
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Output Drive Capability: 10 LSTTL Loads
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2 to 6 V
Low Input Current: 1
碌A(chǔ)
High Noise Immunity Characteristic of CMOS Devices
In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
鈥?/div>
Chip Complexity: 116 FETs or 29 Equivalent Gates
MC54/74HC688
J SUFFIX
CERAMIC PACKAGE
CASE 732鈥?3
1
20
20
1
N SUFFIX
PLASTIC PACKAGE
CASE 738鈥?3
20
1
DW SUFFIX
SOIC PACKAGE
CASE 751D鈥?4
ORDERING INFORMATION
MC54HCXXXJ
MC74HCXXXN
MC74HCXXXDW
Ceramic
Plastic
SOIC
LOGIC DIAGRAM
A0
A1
A2
DATA
WORD
A
INPUTS
A3
A4
A5
A6
A7
B0
B1
DATA
WORD
B
INPUTS
B2
B3
B4
B5
B6
B7
CASCADE
INPUT
2
4
6
8
11
13
15
17
3
5
7
9
12
14
16
18
1
PIN 20 = VCC
PIN 10 = GND
19
A=B
OUTPUT
PIN ASSIGNMENT
CASCADE
INPUT
A0
B0
A1
B1
A2
B2
A3
B3
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
A7
B6
A6
B5
A5
B4
VCC
A=B
FUNCTION TABLE
Inputs
Data
Words
A=B
A>B
A<B
X
Cascade
L
L
L
H
Output
A=B
L
H
H
H
10/95
漏
Motorola, Inc. 1995
1
REV 6
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廠商
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1
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