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PDF MM54HC85 Data sheet ( Hoja de datos )
| Número de pieza | MM54HC85 | |
| Descripción | 4-Bit Magnitude Comparator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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November 1995
MM54HC85 MM74HC85
4-Bit Magnitude Comparator
General Description
The MM54HC85 MM74HC85 is a 4-bit magnitude compara-
tor that utilizes advanced silicon-gate CMOS technology It
is designed for high speed comparison of two four bit words
This circuit has eight comparison inputs 4 for each word
three cascade inputs (AkB AlB AeB) and three deci-
sion outputs (AkB AlB AeB) 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 con-
necting the outputs of the least significant stage to the cas-
cade inputs of the next stage words of greater than four bits
can be compared In addition the least significant stage
must have a high level applied to the AeB input and a low
level to the AkB and AlB inputs
The comparator’s outputs can drive 10 low power Schottky
TTL (LS-TTL) equivalent loads and is functionally and pin
equivalent to the 54LS85 74LS85 All inputs are protected
from damage due to static discharge by diodes to VCC and
ground
Features
Y Typical propagation delay 27 ns
Y Wide operating voltage range 2 – 6V
Y Low input current 1 mA maximum
Y Low quiescent current 80 mA maximum (74HC Series)
Y Output drive capability 10 LS-TTL loads
Connection Diagram
Dual-In-Line Package
Order Number MM54HC85 or MM74HC85
Truth Table
Comparing
Inputs
A3 B3
A2 B2
A1 B1
A3 l B3
A3 k B3
A3 e B3
A3 e B3
A3 e B3
A3 e B3
A3 e B3
A3 e B3
A3 e B3
A3 e B3
A3 e B3
A3 e B3
A3 e B3
X
X
A2 l B2
A2 k B2
A2 e B2
A2 e B2
A2 e B2
A2 e B2
A2 e B2
A2 e B2
A2 e B2
A2 e B2
A2 e B2
X
X
X
X
A1 l B1
A1 k B1
A1 e B1
A1 e B1
A1 e B1
A1 e B1
A1 e B1
A1 e B1
A1 e B1
A0 B0
X
X
X
X
X
X
A0 l B0
A0 k B0
A0 e B0
A0 e B0
A0 e B0
A0 e B0
A0 e B0
AlB
X
X
X
X
X
X
X
X
H
L
X
H
L
Cascading
Inputs
AkB
X
X
X
X
X
X
X
X
L
H
X
H
L
AeB
X
X
X
X
X
X
X
X
L
L
H
L
L
TL F 5205 – 1
AlB
H
L
H
L
H
L
H
L
H
L
L
L
H
Outputs
AkB
L
H
L
H
L
H
L
H
L
H
L
L
H
AeB
L
L
L
L
L
L
L
L
L
L
H
L
L
C1995 National Semiconductor Corporation TL F 5205
RRD-B30M115 Printed in U S A
1 page  
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet MM54HC85.PDF ] | |
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