HOLT INTEGRATED CIRCUITS

www.holtic.com

ARINC INPUTS TESTA TESTB OUTA OUTB

INA - INB

-2.5 to +2.5 V

0

0

0

0

< -6.5 V

0

0

0

1

> +6.5 V

0

0

1

0

X0

1

0

1

X1

0

1

0

X1

1

0

0

FUNCTION TABLE

44-Pin Plastic Quad Flat Pack (PQFP)

33 - OUT2 BX

32 - OUT2 AY

31 - OUT2 BY

30 - N/C

29 - VDD

28 - N/C

27 - VSS

26 - N/C

25 - OUT3 AX

24 - OUT3 BX

23 - OUT3 AY

IN2 BX - 1

IN2 AY - 2

IN2 BY - 3

N/C - 4

TESTA(X) - 5

TESTB(X) - 6

TESTA(Y) - 7

TESTB(Y) - 8

IN3 AX - 9

IN3 BX - 10

IN3 AY - 11

HI-8448PQ

HI-8448PQ-10

Octal

Receiver

HI-8444PS

HI-8444PS-10

&

HI-8445PS

HI-8445PS-10

Quad

Receiver

HI-8444, HI-8445, HI-8448

Quad / Octal ARINC 429 Line Receivers

DESCRIPTION

FEATURES

PIN CONFIGURATIONS

The HI-8444 and HI-8445 are quad ARINC 429 line

receiver ICs available in a 20-pin TSSOP package. The HI-

8448 contains 8 independent ARINC 429 line receivers.

The technology is analog / digital CMOS. The device is

designed to operate from either a 5V or 3.3V supply. Each

receiver channel translates incoming ARINC 429 data bus

signals to a pair of TTL / CMOS outputs.

The optional HI-8444-10, HI-8445-10 and HI-8448-10 are

designed to be used with an external 10 Kohm series

resistor. The “-10” devices meet the lightning protection

requirements of DO-160C/D level 3, waveforms 3, 4, and

5A.

The TESTA and TESTB inputs bypass the analog inputs for

testing purposes. They force the receiver outputs to the

specified ZERO, ONE or NULL state. The ARINC inputs

are ignored when the device is in the test mode.

The HI-8445 is identical to the HI-8444 except the TESTA

and TESTB pins are not available.

!

!

!

!

!

Direct ARINC 429 quad or octal line receivers in small

footprint packages

3.3V or 5.0V single supply operation

Test inputs bypass analog inputs and force digital

outputs to a one, zero, or null state

ARINC inputs are internally lightning protected per DO-

160C/D level 3 (-10 configuration only)

Military processing options available

IN1 A

IN1 B

IN2 A

IN2 B

TESTA (8444 only)

TESTB (8444 only)

IN3 A

IN3 B

IN4 A

IN4 B

OUT1 A

OUT1 B

OUT2 A

OUT2 B

VDD

VSS

OUT3 A

OUT3 B

OUT4 A

OUT4 B

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

20 Pin Plastic TSSOP package

September 2006

(DS8444 Rev. D)

09/06