HD-15531/883
March 1997
CMOS Manchester Encoder-Decoder
Description
The Intersil HD-15531/883 is a high performance CMOS
device intended to service the requirements of MIL-STD-
1553 and similar Manchester II encoded, time division multi-
plexed serial data protocols. This LSI chip is divided into two
sections, an Encoder and a Decoder. These sections oper-
ate independently of each other, except for the master reset
and word length functions. This circuit provides many of the
requirements of MIL-STD-1553. The Encoder produces the
sync pulse and the parity bit as well as the encoding of the
data bits. The Decoder recognizes the sync pulse and identi-
鏗乪s it as well as decoding the data bits and checking parity.
The HD-15531/883 also surpasses the requirements of MIL-
STD-1553 by allowing the word length to be programmable
(from 2 to 28 data bits). A frame consists of three bits for
sync followed by the data word (2 to 28 data bits) followed by
one bit of parity, thus, the frame length will vary from 6 to 32
bit periods. This chip also allows selection of either even or
odd parity for the Encoder and Decoder separately.
This integrated circuit is fully guaranteed to support the
1MHz data rate of MIL-STD-1553 over both temperature and
voltage. For high speed applications the 15531B will support
a 2.5 Megabit/sec data rate.
The HD-15531/883 can also be used in many party line digi-
tal data communications applications, such as a local area
network or an environmental control system driven from a
single twisted pair or 鏗乥er optic cable throughout a building.
Features
鈥?This Circuit is Processed in Accordance to MIL-STD-
883 and is Fully Conformant Under the Provisions of
Paragraph 1.2.1.
鈥?Support of MIL-STD-1553
鈥?Data Rate (15531B) . . . . . . . . . . . . . . . 2.5 Megabit/Sec
鈥?Data Rate (15531) . . . . . . . . . . . . . . . . 1.25 Megabit/Sec
鈥?Variable Frame Length to 32-Bits
鈥?Sync Identi鏗乧ation and Lock-In
鈥?Separate Manchester II Encode, Decode
鈥?Low Operating Power . . . . . . . . . . . . . . . . . 50mW at 5V
Ordering Information
PACKAGE
CERDIP
TEMPERATURE RANGE
-55
o
C to +125
o
C
1.25MBIT/SEC
HD1-15531/883
2.5MBIT/SEC
HD1-15531B/883
PKG. NO.
F40.6
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
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Copyright
漏
Intersil Corporation 1999
File Number
2962.1
5-170
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