HI-8444, HI-8445, HI-8448
Quad / Octal ARINC 429 Line Receivers
January 2003
DESCRIPTION
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.
PIN CONFIGURATIONS
IN1 A
IN1 B
IN2 A
IN2 B
TESTA (8444 only)
TESTB (8444 only)
IN3 A
IN3 B
IN4 A
IN4 B
1
2
3
4
5
6
7
8
9
10
20
19
OUT1 A
OUT1 B
OUT2 A
OUT2 B
VDD
VSS
OUT3 A
OUT3 B
OUT4 A
OUT4 B
HI-8444PS
HI-8444PS-10
&
HI-8445PS
HI-8445PS-10
Quad
Receiver
18
17
16
15
14
13
12
11
20 Pin Plastic TSSOP package
FEATURES
!
!
!
!
- IN2 AX
- IN1 BY
- IN1 AY
- IN1 BX
- IN1 AX
- N/C
- OUT1 AX
- OUT1 BX
- OUT1 AY
- OUT1 BY
- OUT2 AX
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
!
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
44
43
42
41
40
39
38
37
36
35
34
HI-8448PQ
HI-8448PQ-10
Octal
Receiver
FUNCTION TABLE
ARINC INPUTS TESTA TESTB OUTA OUTB
INA - INB
-2.5 to +2.5 V
< -6.5 V
> +6.5 V
X
X
X
0
0
0
0
1
1
0
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
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
44-Pin Plastic Quad Flat Pack (PQFP)
(DS8444 Rev. C)
HOLT INTEGRATED CIRCUITS
www.holtic.com
IN3 BY - 12
IN4 AX - 13
IN4 BX - 14
IN4 AY - 15
IN4 BY - 16
N/C - 17
OUT4 BY - 18
OUT4 AY - 19
OUT4 BX - 20
OUT4 AX - 21
OUT3 BY - 22
01/03
HOLTIC [ HOLT INTEGRATED CIRCUITS ]
