HI-8282APQI Holt Integrated Circuits, HI-8282APQI Datasheet - Page 3

• Manufacturer Part Number: HI-8282APQI
• Manufacturer: Holt Integrated Circuits

Specifications of HI-8282APQI

• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Package Type: PQFP
• Rad Hardened: No
• Lead Free Status / Rohs Status: Not Compliant

FUNCTIONAL DESCRIPTION
CONTROL WORD REGISTER
The HI-8282A contains 10 data flip flops whose D inputs are con-
nected to the data bus and clocks connected to
flip flop provides options to the user as follows:
429DI1(A)
429DI2(A)
429DI1(B)
429DI2(B)
BDO6
DATA
BDO5
BDO7
BDO8
BDO9
BUS
BD10
BD11
BD12
BD13
BD14
PIN
OR
OR
CLK SELECT
CLK SELECT
FUNCTION CONTROL
RECEIVER 1
RECEIVER 2
XMTR DATA
SELF TEST
DECODER
DECODER
RCVR DTA
INVERT
PARITY
XMTR
-
-
-
-
v
v
cc
cc
FIGURE 1. ARINC RECEIVER INPUT
GND
GND
0 = ENABLE
1 = ENABLE
1 = ENABLE
1 = ENABLE
0 = ÷10
1 = ÷80
0 = ÷10
1 = ÷80
-
-
-
-
DIFFERENTIAL
AMPLIFIERS
Logic 0 enables normal odd parity
429DO
If enabled, an internal connection
and Logic 1 enables even parity
CLK is divided either by 10 or
80 to obtain XMTR data clock
CLK is divided either by 10 or
80 to obtain RCVR data clock
If enabled, ARINC bits 9 and,
is made passing 429DO and
If enabled, ARINC bits 9 and
output in transmitter 32nd bit
10 must match the next two
10 must match the next two
enabled, the ARINC bit 10
enabled, then ARINC bit 9
enabled, the ARINC bit 9
If Receiver 1 Decoder is
If Receiver 1 Decoder is
If Receiver 2 Decoder is
If Receiver 2 Decoder is
enabled, then ARINC bit 10
must match this bit
must match this bit
must match this bit
must match this bit
to the receiver logic inputs
control word bits
control word bits
DESCRIPTION
COMPARATORS
CWSTR
HOLT INTEGRATED CIRCUITS
. Each
NULL
ONES
ZEROES
HI-8282A
3
The following table shows the bit positions in exchanging data with the
receiver or transmitter. ARINC bit 1 is the first bit transmitted or
received.
ARINC
THE RECEIVERS
ARINC BUS INTERFACE
Figure 1 shows the input circuit for each receiver. The ARINC 429
specification requires the following detection levels:
The HI-8282A guarantees recognition of these levels with a common
mode Voltage with respect to GND less than ±5V for the worst case
condition (4.75V supply and 13v signal level).
Design tolerances guarantee detection of the above levels, so the
actual acceptance ranges are slightly larger. If the ARINC signal is
out of the actual acceptance ranges, including the nulls, the chip
rejects the data.
HI-8282A-10
The HI-8282A-10 option is similar to the HI-8282A with the exception
that it allows an external 10K to 15K ohm resistor to be added in
series with each ARINC input without affecting the ARINC input
thresholds. This option is especially useful in applications where
lightning protection circuitry is also required.
Each side of the ARINC bus must be connected through a 10K to 15K
ohm series resistor in order for the chip to detect the correct ARINC
levels. The typical 10 volt differential signal is translated and input to
a window comparator and latch. The comparator levels are set so
that with the external 10K to 15K ohm resistors, they are just below
the standard 6.5 V minimum ARINC data threshold and just above
the 2.5 V maximum ARINC null threshold.
The receivers of the HI-8282A-10, when used with external
15K ohm resistors, will withstand DO-160F, Level 3, waveforms 3,
4, 5A and 5B pin injection. No additional lightning protection circuit
is necessary.
Please refer to the Holt AN-300 Application Note for additional
information and recommendations on lightning protection of Holt
Line Drivers and Receivers.
RECEIVER LOGIC OPERATION
Figure 2 (next page) is a block diagram for each receiver’s logic.
DATA
ARINC
BUS
DATA
BIT
BUS
BIT
BD BD BD BD BD BD BD BD BD BD BD BD BD BD BD BD
BD BD BD BD BD BD BD BD BD BD BD BD BD BD BD BD
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
13 12 11 10
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14
STATE
ZERO
NULL
ONE
ARINC 429 DATA FORMAT
9
DIFFERENTIAL VOLTAGE
+6.5 Volts to +13 Volts
+2.5 Volts to -2.5 Volts
31 30 32
-6.5 Volts to -13 Volts
BYTE 1
BYTE 2
1
2
3
4
5
6
7
8