HI-8581
June 2001
GENERAL DESCRIPTION
The HI-8581 device from Holt Integrated Circuits is a silicon
gate CMOS device for interfacing a 16-bit parallel data bus
directly to the ARINC 429 serial bus. The device provides
two receivers, an independent transmitter and line driver
capability in a single package. The receiver input circuitry
and logic are designed to meet the ARINC 429
specifications for loading, level detection, timing, and
protocol. The transmitter section provides the ARINC 429
communication protocol and the line driver circuits provide
the ARINC 429 output levels.
The 16-bit parallel data bus exchanges the 32-bit ARINC
data word in two steps when either loading the transmitter
or interrogating the receivers. The data bus interfaces with
CMOS and TTL.
Timing of all the circuitry begins with the master clock input,
CLK. For ARINC 429 applications, the master clock
frequency is 1 MHz.
Each independent receiver monitors the data stream with a
sampling rate 10 times the data rate. The sampling rate is
software selectable at either 1MHz or 125KHz. The results
of a parity check are available as the 32nd ARINC bit. The
HI-8581 examines the null and data timings and will reject
erroneous patterns. For example, with a 125 KHz clock
selection, the data frequency must be between 10.4 KHz
and 15.6 KHz.
The transmitter has a First In, First Out (FIFO) memory to
store 8 ARINC words for transmission. The data rate of the
transmitter is software selectable by dividing the master
clock, CLK, by either 10 or 80. The master clock is used to
set the timing of the ARINC transmission within the required
resolution.
FEATURES
!
ARINC specification 429 compatible
!
Direct receiver and transmitter interface to
ARINC bus in a single device.
!
16-Bit parallel data bus.
!
Timing control 10 times the data rate
!
Selectable data clocks
!
Receiver error rejection per ARINC
specification 429
!
Automatic transmitter data timing
!
Self test mode
!
Parity functions
!
Low power
!
Industrial & full military temperature ranges
PIN CONFIGURATION
(Top View)
429DI2(B) - 1
D/R1 - 2
D/R2 - 3
SEL - 4
EN1 - 5
EN2 - 6
BD15 - 7
BD14 - 8
BD13 - 9
BD12 - 10
BD11 - 11
HI-8581PQI
&
HI-8581PQT
33 - ENTX
32 - N/C
31 - V+
30 - TXB(OUT)
29 - TXA(OUT)
28 - V-
27 - GND
26 - TX/R
25 - PL2
24 - PL1
23 - BD00
APPLICATIONS
!
Avionics data communication
!
Serial to parallel conversion
!
Parallel to serial conversion
(See page 13 for additional pin configurations)
(DS8581 Rev. A)
HOLT INTEGRATED CIRCUITS
1
06/01
HOLTIC [ HOLT INTEGRATED CIRCUITS ]
