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CD74HC85 Datasheet(PDF) 2 Page - Texas Instruments

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Part No. CD74HC85
Description  High Speed CMOS Logic 4-Bit Magnitude Comparator
Download  8 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CD74HC85 Datasheet(HTML) 2 Page - Texas Instruments

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2
Functional Diagram
TRUTH TABLE
COMPARING INPUTS
CASCADING INPUTS
OUTPUTS
A3, B3
A2, B2
A1, B1
A0, B0
A > B
A < B
A = B
A > B
A < B
A = B
SINGLE DEVICE OR SERIES CASCADING
A3 > B3
X
X
X
X
X
X
H
L
L
A3 < B3
X
X
X
X
X
X
L
H
L
A3 = B3
A2 >B2
X
X
X
X
X
H
L
L
A3 = B3
A2 < B2
X
X
X
X
X
L
H
L
A3 = B3
A2 = B2
A1 > B1
X
X
X
X
H
L
L
A3 = B3
A2 = B2
A1 < B1
X
X
X
X
L
H
L
A3 = B3
A2 = B2
A1 = B1
A0 > B0
X
X
X
H
L
L
A3 = B3
A2 = B2
A1 = B1
A0 < B0
X
X
X
L
H
L
A3 = B3
A2 = B2
A1 = B1
A0 = B0
H
L
L
H
L
L
A3 = B3
A2 = B2
A1 = B1
A0 = B0
L
H
L
L
H
L
A3 = B3
A2 = B2
A1 = B1
A0 = B0
L
L
H
L
L
H
PARALLEL CASCADING
A3 = B3
A2 = B2
A1 = B1
A0 = B0
X
X
H
L
L
H
A3 = B3
A2 = B2
A1 = B1
A0 = B0
H
H
LLLL
A3 = B3
A2 = B2S
A1 = B1
A0 = B0
L
L
L
H
H
L
NOTE: H = High Voltage Level, L = Low Voltage, Level, X = Don’t Care
6
5
(A > B) OUT
15
13
12
10
3
1
4
2
A3
B3
(A > B) IN
(A = B) IN
(A < B) IN
A0
A1
A2
14
B2
11
B1
9
B0
7
(A = B) OUT
(A < B) OUT
CD74HC85, CD74HCT85


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