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7485 Datasheet

  • 7485

  • 4-Bit Magnitude Comparators

  • 8頁

  • NSC

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54LS85 DM54LS85 DM74LS85 4-Bit Magnitude Comparators
June 1989
54LS85 DM54LS85 DM74LS85
4-Bit Magnitude Comparators
General Description
These 4-bit magnitude comparators perform comparison of
straight binary or BCD codes Three fully-decoded decisions
about two 4-bit words (A B) are made and are externally
available at three outputs These devices are fully expand-
able to any number of bits without external gates Words of
greater length may be compared by connecting compara-
tors in cascade The A
l
B A
k
B and A
e
B outputs of a
stage handling less-significant bits are connected to the cor-
responding inputs of the next stage handling more-signifi-
cant bits The stage handling the least-significant bits must
have a high-level voltage applied to the A
e
B input The
cascading path is implemented with only a two-gate-level
delay to reduce overall comparison times for long words
Features
Y
Y
Y
Typical power dissipation 52 mW
Typical delay (4-bit words) 24 ns
Alternate Military Aerospace device (54LS85) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
Order Number 54LS85DMQB
54LS85FMQB 54LS85LMQB
DM54LS85J DM54LS85W
DM74LS85M or DM74LS85N
See NS Package Number E20A
J16A M16A N16E or W16A
TL F 6379 鈥?1
Function Table
Comparing
Inputs
A3 B3
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
A3
e
B3
A2 B2
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
A2
e
B2
A1 B1
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
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
A0
e
B0
A
l
B
X
X
X
X
X
X
X
X
H
L
L
X
H
L
Cascading
Inputs
A
k
B
X
X
X
X
X
X
X
X
L
H
L
X
H
L
A
e
B
X
X
X
X
X
X
X
X
L
L
H
H
L
L
A
l
B
H
L
H
L
H
L
H
L
H
L
L
L
L
H
Outputs
A
k
B
L
H
L
H
L
H
L
H
L
H
L
L
L
H
A
e
B
L
L
L
L
L
L
L
L
L
L
H
H
L
L
H
e
High Level L
e
Low Level X
e
Don鈥檛 Care
C
1995 National Semiconductor Corporation
TL F 6379
RRD-B30M105 Printed in U S A

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