HI-8785(2001) Просмотр технического описания (PDF) - Holt Integrated Circuits

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HI-8785
(Rev.:2001)

ARINC INTERFACE DEVICE 8 bit parallel data converted to 429 & 561 serial data out

Holt Integrated Circuits 

HI-8783, HI-8784, HI-8785

WRITE

A0

byte

counter

XMIT CLK

status &

control

logic

DATA 8

BUS

8 to 32 bit

mux

32

32 bit

buffer

register

32

32 bit

shift

register

SLP1.5

XMT RDY

word gap

counter

bit

counter

line

driver

TXAOUT

TXBOUT

HI-8784, HI8785

output

logic

DATA ONE

DATA ZERO

HI-8783

561 SYNC

561 DATA

PARITY ENB

Figure 1. Block Diagram

FUNCTIONAL DESCRIPTION (Cont.)

The HI-8784 and HI-8785 have the same digital logic func-

tion as the HI-8783, but include an on-chip line driver de-

signed to directly drive the ARINC 429 bus. The two ARINC

outputs (TXAOUT and TXBOUT) provide a differential volt-

age to produce a +10 volt One, a -10 volt Zero, and a 0 volt

Null. The slope of the ARINC outputs is controlled by the

SLP1.5 pin. If SLP1.5 is high, the output rise and fall time is

nominally 1.5us. If SLP1.5 is set low, the rise and fall times

are 10us. DATA ONE and DATA ZERO outputs are not pro-

vided for the HI-8784 and HI-8785.

The HI-8784 has 37.5 ohms in series with each line driver

output. The HI-8785 has 10.0 ohms in series. The HI-8785

is for applications where external series resistance is

needed, typically for lightning protection devices.

A0 Byte Data Bus

ARINC Bits

1

Byte 1 D0 - D7

0

Byte 2 D0 - D7

0

Byte 3 D0 - D7

0

Byte 4 D0 - D7

ARINC 1 - ARINC 8

ARINC 9 - ARINC 16

ARINC 17 - ARINC 24

ARINC 25 - ARINC 32

Figure 2. Order of transmitted bytes

HOLT INTEGRATED CIRCUITS

3

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