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74HC_HCT85_CNV_15 Datasheet, PDF (4/9 Pages) NXP Semiconductors – 4-bit magnitude comparator
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Philips Semiconductors
4-bit magnitude comparator
Product specification
74HC/HCT85
Fig.4 Functional diagram.
APPLICATIONS
• Process controllers
• Servo-motor control
FUNCTION TABLE
COMPARING INPUTS
A3, B3
A3>B3
A3<B3
A3=B3
A3=B3
A3=B3
A3=B3
A3=B3
A3=B3
A3=B3
A3=B3
A3=B3
A3=B3
A3=B3
A3=B3
A2, B2
X
X
A2>B2
A2<B2
A2=B2
A2=B2
A2=B2
A2=B2
A2=B2
A2=B2
A2=B2
A2=B2
A2=B2
A2=B2
A1, B1
X
X
X
X
A1>B1
A1<B1
A1=B1
A1=B1
A1=B1
A1=B1
A1=B1
A1=B1
A1=B1
A1=B1
A0, B0
X
X
X
X
X
X
A0>B0
A0<B0
A0=B0
A0=B0
A0=B0
A0=B0
A0=B0
A0=B0
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
CASCADING INPUTS
IA>B
IA<B
IA=B
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
L
L
L
H
L
L
L
H
X
X
H
H
H
L
L
L
L
December 1990
4
QA>B
H
L
H
L
H
L
H
L
H
L
L
L
L
H
OUTPUTS
QA<B
L
H
L
H
L
H
L
H
L
H
L
L
L
H
QA=B
L
L
L
L
L
L
L
L
L
L
H
H
L
L
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