HI-8787, HI-8788
January 2001
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 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 automatically sent.
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
24 - TXBOUT
HI-8787PQI
HI-8787PQT
HI-8788PQI
&
HI-8788PQT
23 - TXAOUT
22 - V-
21 - PARITY ENB
20 - XMT RDY
19 - XMIT CLK
18 - RESET
17 - WRITE
FEATURES
32-Pin Plastic TQFP package
l
Automatically converts 16 bit parallel data
to ARINC 429 or 561 data
High speed data bus interface
On-chip line driver
Available in small TQFP package
Military processing options
l
l
l
l
(DS8787 Rev. B)
HOLT INTEGRATED CIRCUITS
1
01/01
HOLTIC [ HOLT INTEGRATED CIRCUITS ]
