HI-8787_09 Datasheet, PDF (1/8 Pages) Holt Integrated Circuits – ARINC 429 & 561 INTERFACE DEVICE

February 2009
HI-8787, HI-8788
ARINC 429 & 561 INTERFACE DEVICE
16 Bit Parallel Data In / ARINC Serial Data Out
DESCRIPTION
The HI-8787 and HI-8788 are system components for
interfacing 16 bit parallel data to an ARINC 429 bus. They
combine logic and line driver on one chip. The HI-8787 has
an output resistance of 37.5 ohms, and the HI-8788 has
output resistance of 10 ohms to facilitate external lightning
protection circuitry. The technology is analog/digital
CMOS.
Both products offer high speed data bus transactions into a
buffer register. After loading 2 each 16-bit words, data is
automatically transferred and transmitted. The data rate is
equal to the clock rate. Parity can be enabled in the 32nd
bit. Reset is used to initialize the logic upon startup. Word
gaps are sent automatically.
The part requires +/- 10 volt supplies in addition to a 5 volt
supply.
PIN CONFIGURATION
D4 - 1
N/C - 2
D5 - 3
D6 - 4
D7 - 5
D8 - 6
D9 - 7
D10 - 8
HI-8787PQI
HI-8787PQT
HI-8788PQI
&
HI-8788PQT
24 - TXBOUT
23 - TXAOUT
22 - V-
21 - PARITY ENB
20 - XMT RDY
19 - XMIT CLK
18 - RESET
17 - WRITE
FEATURES
l _{Automatically converts 16 bit parallel}
data to ARINC 429 or 561 serial data
l _{High speed data bus interface}
l _{On-chip line driver}
l _{Available in small TQFP package}
l _{Industrial and extended temperature}
ranges
32-Pin Plastic PQFP package
(DS8787 Rev. J)
HOLT INTEGRATED CIRCUITS
www.holtic.com
02/09