HI-8685 Datasheet, PDF (1/10 Pages) Holt Integrated Circuits – ARINC INTERFACE DEVICE ARINC 429& 561 SERIAL DATA TO 16-BIT PARALLEL DATA

February 2001
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 10KΩ 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.
FEATURES
! Automatic conversion of serial ARINC 429, 575 &
561 data to 16-bit parallel data
! High speed parallel 16-bit data bus
! Error detection - word length and parity
! Reset input for power-on initialization
! 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, surface mount, plastic package options:
SOIC, TQFP and PLCC
! Military processing available
PIN CONFIGURATIONS (Top View)
DATARDY
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
GND
1
28
2
27
3
26
4
25
5
24
6 HI-8685PSI 23
7 ^HI-8685PST 22
&
8
21
HI-8685PSI-10
9 _{HI-8685PST-10} 20
10
19
11
18
12
17
13
16
14
15
Vcc
GAPCLK
TESTA
TESTB
RESET
RINB (-10)
RINA (-10)
ERROR
PARITY ENB
READ
D0
D1
D2
D3
HI-8685
28-Pin Plastic SOIC - WB Package
N/C - 1
D12 - 2
D11 - 3
D10 - 4
D9 - 5
D8 - 6
D7 - 7
D6 - 8
HI-8686PQI
HI-8686PQT
24 - RESET
23 - RINB-10
22 - RINB
21 - RINA
20 - RINA-10
19 - ERROR
18 - PARITY ENB
17 - N/C
HI-8686
32-Pin PlasticTQFP Package
(See page 8 for additional pin configurations)
(DS8685 Rev. G)
HOLT INTEGRATED CIRCUITS
1
02/01