HCC4585B Datasheet, PDF (3/12 Pages) STMicroelectronics – 4-BIT MAGNITUDE COMPARATOR

LOGIC DIAGRAM
HCC/HCF4585B
TRUTH TABLE
Inputs
Compari ng
A3, B3 A2, B2 A1, B1 A0, B0
A3 > B3
A3 = B3
A3 = B3
A3 = B3
X
A2 > B2
A2 = B2
A2 = B2
X
X
A1 > B1
A1 = B1
X
X
X
A0 > B0
A3 = B3
A3 = B3
A3 = B3
A2 = B2
A2 = B2
A2 = B2
A1 = B1
A1 = B1
A1 = B1
A0 = B0
A0 = B0
A0 = B0
A3 = B3
A3 = B3
A3 = B3
A3 < B3
A2 = B2
A2 = B2
A2 < B2
X
A1 = B1
A1 < B1
X
X
A0 < B0
X
X
X
X = Don’t Care
A<B
X
X
X
X
0
0
1
X
X
X
X
Cascading
A=B A>B
X
1
X
1
X
1
X
1
0
1
1
X
0
X
X
X
X
X
X
X
X
X
A<B
0
0
0
0
0
0
1
1
1
1
1
Outputs
A =B A > B
0
1
0
1
0
1
0
1
0
1
1
0
0
0
0
0
0
0
0
0
0
0
Logic 1 = High Level
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