HI-8783 Ver la hoja de datos (PDF) - Holt Integrated Circuits
Número de pieza
componentes Descripción
Fabricante
HI-8783
Holt Integrated Circuits
HI-8783 Datasheet PDF : 10 Pages
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HI-8783, HI-8784, HI-8785
WRITE
A0
byte
counter
XMIT CLK
status &
control
logic
DATA
8
BUS
8 to 32 bit
mux
32
32 bit
buffer
register
32
32 bit
shift
register
SLP1.5
XMT RDY
word gap
counter
bit
counter
line
driver
TXAOUT
TXBOUT
HI-8784, HI8785
output
logic
DATA ONE
DATA ZERO
HI-8783
561 SYNC
561 DATA
PARITY ENB
Figure 1. Block Diagram
FUNCTIONAL DESCRIPTION (Cont.) A0 Byte Data Bus
ARINC Bits
The HI-8784 and HI-8785 have the same digital logic func-
tion as the HI-8783, but include an on-chip line driver de-
signed to directly drive the ARINC 429 bus. The two ARINC
outputs (TXAOUT and TXBOUT) provide a differential volt-
age to produce a +10 volt One, a -10 volt Zero, and a 0 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 1.5us. If SLP1.5 is set low, the rise and fall times
are 10us. DATA ONE and DATA ZERO outputs are not pro-
vided for the HI-8784 and HI-8785.
1
Byte 1 D0 - D7
0
Byte 2 D0 - D7
0
Byte 3 D0 - D7
0
Byte 4 D0 - D7
ARINC 1 - ARINC 8
ARINC 9 - ARINC 16
ARINC 17 - ARINC 24
ARINC 25 - ARINC 32
Figure 2. Order of transmitted bytes
POWER SUPPLY SEQUENCING (HI-8784 & HI-8785 Only)
The HI-8784 has 37.5 ohms in series with each line driver out-
put. The HI-8785 has 10.0 ohms in series. The HI-8785 is for
applications where external series resistance is needed, typi-
cally for lightning protection devices.
The power supplies must be controlled to prevent large
currents during supply turn-on and turn-off. The required
sequence is V+ followed by VCC, always ensuring that V+ is
the most positive supply. The V- supply is not critical and can
be asserted at any time.
HOLT INTEGRATED CIRCUITS
3
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