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Renesas Electronics Components Datasheet

HD74LS85P Datasheet

4-bit Magnitude Comparator

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HD74LS85
4-bit Magnitude Comparator
REJ03D0421–0200
Rev.2.00
Feb.18.2005
This four bit magnitude comparator performs comparison of straight binary and straight BCD (8-4-2-1) codes. Three
fully decoded decisions about two 4-bit words (A, B) are made and are externally available at three outputs. This
device is fully expandable to any number of bits without external gates. Words of greater length may be compared by
connecting comparators in cascade. The A > B, A < B, and A = B outputs of a stage handling less-significant bits. The
stage handling the least- significant bits must have a high-level voltage applied to the A β B input. The cascading path
is implemented with only a two-gate-level delay to reduce overall comparison times for long words.
Features
Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74LS85P
DILP-16 pin
PRDP0016AE-B
P
(DP-16FV)
HD74LS85FPEL SOP-16 pin (JEITA)
PRSP0016DH-B
(FP-16DAV)
FP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
Pin Arrangement
B3
Data Input
1
A<B 2
Cascade
Inputs
A=B
3
A>B 4
A>B 5
Outputs 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
16 VCC
15 A3
14 B2
13 A2
12 A1 Data Inputs
11 B1
10 A0
9 B0
(Top view)
Rev.2.00, Feb.18.2005, page 1 of 6


Renesas Electronics Components Datasheet

HD74LS85P Datasheet

4-bit Magnitude Comparator

No Preview Available !

HD74LS85
Function Table
Inputs
A3, B3
A2, B2
A1, B1
A0, B0
A3 > B3
X
X
X
A3 < B3
X
X
X
A3 = B3
A2 > B2
X
X
A3 = B3
A2 < B2
X
X
A3 = B3
A2 = B2
A1 > B1
X
A3 = B3
A2 = B2
A1 < B1
X
A3 = B3
A2 = B2
A1 = B1
A0 > B0
A3 = B3
A2 = B2
A1 = B1
A0 < B0
A3 = B3
A2 = B2
A1 = B1
A0 = B0
A3 = B3
A2 = B2
A1 = B1
A0 = B0
A3 = B3
A2 = B2
A1 = B1
A0 = B0
A3 = B3
A2 = B2
A1 = B1
A0 = B0
A3 = B3
A2 = B2
A1 = B1
A0 = B0
H; high level, L; low level, X; irrelevant
Cascading Inputs
A>B
A<B
A=B
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
H
L
L
L
H
L
X
X
H
H
H
L
L
L
L
Block Diagram
A>B
H
L
H
L
H
L
H
L
H
L
L
L
H
Outputs
A<B
L
H
L
H
L
H
L
H
L
H
L
L
H
A=B
L
L
L
L
L
L
L
L
L
L
H
L
L
A3
B3
A2
B2
A<B
A=B
A>B
A1
B1
A>B
A=B
A<B
A0
B0
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Supply voltage
VCC
7
V
Input voltage
VIN
7
V
Power dissipation
Storage temperature
PT
Tstg
400
mW
–65 to +150
°C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Rev.2.00, Feb.18.2005, page 2 of 6


Part Number HD74LS85P
Description 4-bit Magnitude Comparator
Maker Renesas
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HD74LS85P Datasheet PDF






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