HI-8282

GENERAL DESCRIPTION

The HI-8282 isa silicon gate CMOS device for interfacing

the ARINC 429 serial data bus toa 16-bit parallel data bus.

Two receivers and an independent transmitter are

provided. 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.

Additional interface circuitry such as the Holt HI-8382 is

required to translate the5 volt logic outputs to ARINC 429

drive 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 is1 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

ofa parity check are available as the 32nd ARINC bit. The

HI-8282 examines the null and data timings and will reject

erroneous patterns. For example, witha 125 KHz clock

selection, the data frequency must be between 10.4 KHz

and 15.6 KHz.

The transmitter hasa First In, First Out (FIFO) memory to

store8 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.

APPLICATIONS

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Avionics data communication

Serial to parallel conversion

Parallel to serial conversion

FEATURES

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ARINC specification 429 compatible

16-Bit parallel data bus

Direct receiver interface to ARINC 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, single5 volt supply

Industrial& full military temperature ranges

! DESC SMD part number

HOLT INTEGRATED CIRCUITS

4-29

(DS8282 Rev. A)

01/01

January 2001

44-Pin Plastic Quad Flat Pack (PQFP)

(See page 4-38 for additional Package Pin Configurations)

33- N/C

32- N/C

31 -

30- ENTX

29 -

28- 429DO

27- TX/R

26 -

25 -

24- BD00

23- BD01

CWSTRX

429DO

PL2

PL1

N/C - 1

- 2

- 3

SEL - 4

- 5

- 6

BD15 - 7

BD14 - 8

BD13 - 9

BD12- 10

BD11- 11

D/R1

D/R2

EN1

EN2

HI-8282PQI

&

HI-8282PQT