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HI-8787 Datasheet(PDF) 3 Page - Holt Integrated Circuits

Part No. HI-8787
Description  ARINC INTERFACE DEVICE 16-BIT PARALLEL DATA CONVERTED 429&561 SERIAL DATA OUT
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Maker  HOLTIC [Holt Integrated Circuits]
Homepage  http://www.holtic.com
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HI-8787 Datasheet(HTML) 3 Page - Holt Integrated Circuits

   
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A0
Load
Data Bus
ARINC Bits
1
Word 1
D0- D15
ARINC1- ARINC 16
0
Word 2
D0- D15
ARINC 17- ARINC 32
Figure 2. Order of transmitted data
Figure 1. Block Diagram
DATA
BUS
16 to 32 bit
mux
32 bit
buffer
register
32 bit
shift
register
WRITE
A0
16
32
32
status &
control
logic
XMT RDY
XMIT CLK
word gap
counter
bit
counter
output
logic
line
driver
PARITY ENB
561 DATA
561 SYNC
TXBOUT
TXAOUT
SLP1.5
FUNCTIONAL DESCRIPTION (Cont.)
The HI-8787 and HI-8788 have an on-chip line driver de-
signed to directly drive the ARINC 429 bus. The two ARINC
outputs (TXAOUT and TXBOUT) providea differential volt-
age to producea +10 volt One,a -10 volt Zero, anda0 volt
Null. The slope of the ARINC outputs is controlled by the
SLP1.5 pin. If SLP1.5 is high, the output rise and fall time is
nominally 1.5 s. .If SLP1.5 is set low, the rise and fall times
are 10 s.
The HI-8787 has 37.5 ohms in series with each line driver
output. The HI-8788 has 10.0 ohms in series. The HI-8788
is for applications where external series resistance is
needed, typically for lightning protection devices.
µ
µ
HOLT INTEGRATED CIRCUITS
3


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