MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
4-Bit Magnitude Comparator
High–Performance Silicon–Gate CMOS
The MC74HC85 is identical in pinout and function to the LS85. This device
is similar in function to the MM74C85 and L85, but has a different pinout. The
device inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LSTTL outputs.
This 4–Bit Magnitude Comparator compares two 4–bit nibbles and gives a
high voltage level on either the A > Bout, A = Bout, or A < Bout output, leaving
the other two at a low voltage level. This device also has A > Bin, A = Bin, and
A < Bin inputs, eliminating the need for external gates when cascading.
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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
µA
High Noise Immunity Characteristic of CMOS Devices
In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
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Chip Complexity: 248 FETs or 62 Equivalent Gates
16
1
MC74HC85
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
16
1
DT SUFFIX
TSSOP PACKAGE
CASE 948F–01
ORDERING INFORMATION
MC74HCXXN
MC74HCXXDT
Plastic
TSSOP
PIN ASSIGNMENT
A
LOGIC DIAGRAM
10
12
13
15
5
B0
B1
B2
B3
9
11
14
1
6
7
A > Bout
A = Bout
A < Bout
COMPARISON
OUTPUTS
t
Bin
B3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
A3
B2
A2
A1
B1
A0
B0
A0
A1
A2
DATA
INPUTS
A3
u
Bin
A
u
Bout
A
A = Bout
A
A = Bin
t
Bout
GND
A > Bin
CASCADING
INPUTS
A = Bin
A < Bin
4
3
2
PIN 16 = VCC
PIN 8 = GND
10/95
©
Motorola, Inc. 1995
1
REV 6
MOTOROLA [ MOTOROLA, INC ]
