HD74LS85 Datasheet, PDF (1/7 Pages) Hitachi Semiconductor – 4-bit Magnitude Comparators

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 V_CC
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