HI-8685, HI-8686

ARINC INTERFACE DEVICE

ARINC 429 & 561 Serial Data to 16-Bit Parallel Data

DESCRIPTION

The HI-8685 and HI-8686 are system components for

interfacing incoming ARINC 429 signals to 16-bit parallel

data using proven +5V analog/digital CMOS technology.

Both products incorporate the digital logic and analog line

receiver circuitry in a single device.

The receivers on the HI-8685 and the HI-8686 connect

directly to the ARINC 429 Bus and translate the incoming

signals to normal CMOS levels. Internal comparator levels

are set just below the standard 6.5 volt minimum data

threshold and just above the standard 2.5 volt maximum null

threshold.

The -10 version of the HI-8685 allows the

incorporation of an external 10K

resistance in series with

each ARINC input for lightning protection without affecting

ARINC level detection.

Both products offer high speed 16-bit parallel bus interface,

a 32-bit buffer, and error detection for word length and parity.

A reset pin is also provided for power-on initialization.

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Automatic conversion of serial ARINC 429, 575 &

561 data to 16-bit parallel data

High speed parallel 16-bit data bus

Error detection -

and

On-chip line receiver

Input hysteresis of at least 2 volts

Test lnputs bypass analog inputs

Simplified lightning protection with the ability to

add 10 Kohm external series resistors

Small,

package options:

SOIC, PQFP and PLCC

Industrial and extended temperature ranges

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word length

parity

Reset input for power-on initialization

surface mount, plastic

FEATURES

December 2008

HI-8685

28-Pin Plastic SOIC - WB Package

HI-8686

32-Pin Plastic PQFP Package

HI-8686PQI

HI-8686PQT

24 -

23 - RINB-10

22 - RINB

21 - RINA

20 - RINA-10

19 - ERROR

18 - PARITY ENB

17 - N/C

RESET

HI-8685PSI

HI-8685PST

&

HI-8685PSI-10

HI-8685PST-10

DATARDY

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

GND

Vcc

GAPCLK

TESTA

TESTB

RINB (-10)

RINA (-10)

ERROR

PARITY ENB

D0

D1

D2

D3

RESET

READ

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

N/C - 1

D12-2

D11-3

D10-4

D9-5

D8-6

D7-7

D6-8

(DS8685 Rev. N)

12/08

APPLICATIONS

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Avionics data communication

Serial to parallel conversion

Parallel to serial conversion

(See page 8 for additional pin configurations)

HOLT INTEGRATED CIRCUITS

www.holtic.com