M74HC85 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M74HC85 Datasheet PDF : 10 Pages
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M74HC85
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
2
3
4
5
6
7
9, 11, 14, 1
10, 12, 13,
15
8
16
SYMBOL
INA<B
INA=B
INA>B
OUTA>B
OUTA=B
OUTA<B
B0 to B3
A0 to A3
GND
Vcc
NAME AND FUNCTION
A<B Expansion Input
A=B Expansion Input
A>B Expansion Input
A>B Expansion Output
A=B Expansion Output
A<B Expansion Output
Word B Inputs
Word A Inputs
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
A3 > B3
A3 = B3
A3 = B3
A3 = B3
COMPARING INPUTS
X
A2 > B2
A2 = B2
A2 = B2
X
X
A1 > B1
A1 = B1
A3 = B3
A2 = B2
A1 = B1
A3 = B3
A3 = B3
A3 = B3
A3 < B3
X : Don’t Care
A2 = B2
A2 = B2
A2 < B2
X
A1 = B1
A1 > B1
X
X
X
X
X
A0 > B0
A0 = B0
A0 < B0
X
X
X
CASCADING INPUTS
A>B
X
X
X
X
L
X
L
H
H
X
X
X
X
A<B
X
X
X
X
L
X
H
L
H
X
X
X
X
A=B
X
X
X
X
L
H
L
L
L
X
X
X
X
OUTPUTS
A>B
H
H
H
H
H
L
L
H
L
L
L
L
L
A<B
L
L
L
L
H
L
H
L
L
H
H
H
H
A=B
L
L
L
L
L
H
L
L
L
L
L
L
L
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