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Спецификация HD74HC85 изготовлена «Hitachi Semiconductor» и имеет функцию, называемую «4-Bit Magnitude Comparator». |
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Детали детали
Номер произв | HD74HC85 |
Описание | 4-Bit Magnitude Comparator |
Производители | Hitachi Semiconductor |
логотип |
9 Pages
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HD74HC85
4-Bit Magnitude Comparator
Description
The HD74HC85 id designed for high speed comparison of two four bit words. This circuit has eight
comparison input, 4 for each word; three cascade inputs (A < B, A > B, A = B); and three decision outputs
(A < B, A > B, A = B). The result of a comparison is indicated by a high level on one of the decision
outputs. thus it may be determined whether one word is “greater than,” “less than,” or “equal to” the other
word. by connecting the outputs of the least significant stage to the cascade inputs of the enxt stage, words
of greater than four bits can be compared. In addition the least significant stage must have a high level
applied to the A = B input, and a low level to the A < B, and A > B inputs.
Features
• High Speed Operation: tpd (Data Word Input to Output) = 20 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
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HD74HC85
Function Table
Data Word 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
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
A1, B1
X
X
X
X
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
Cascading Inputs
A > Bin A = Bin
XX
XX
XX
XX
XX
XX
XX
XX
LL
LL
HL
HL
XH
A < Bin
X
X
X
X
X
X
X
X
L
H
L
H
X
Outputs
A > Bout A = Bout A < Bout
HL
L
LL H
HL
L
LL H
HL
L
LL H
HL
L
LL H
HL
H
LL H
HL
L
LL L
LHL
Pin Arrangement
B3
Data 1
Input
A<B 2
A=B 3
A>B 4
A>B 5
A=B 6
A<B 7
GND 8
B3
A<B
A3
A=B In B2
A>B
A2
A>B
A1
A=B out B1
A<B
A0
B0
(Top view)
16 VCC
15 A3
14 B2
13 A2
12 A1
11 B1
10 A0
9 B0
2
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Logic Diagram
B3
A3
B2
A2
B1
A1
B0
A0
A<Bin
A=Bin
A>Bin
HD74HC85
A>Bout
A<Bout
A=Bout
3
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