hi-8585crt ETC-unknow, hi-8585crt Datasheet - Page 2

• Manufacturer Part Number: hi-8585crt
• Description: Arinc429linedriver
• Manufacturer: ETC-unknow

FUNCTIONAL DESCRIPTION
Figure 1 is a block diagram of the line driver. The +5V and
-5V levels are generated internally using on-chip zeners.
Currents for slope control are set by zener voltages across
on-chip resistors.
The TX0IN and TX1IN inputs receive logic signals from a
control transmitter chip such as the HI-6010, HI-3282 or
HI-8282. TXAOUT and TXBOUT hold each side of the
ARINC bus at Ground until one of the inputs becomes a
One. If for example TX1IN goes high, a charging path is
enabled to 5V on an “A” side internal capacitor while the
“B” side is enabled to -5V. The charging current is se-
lected by the SLP1.5 pin. If the SLP1.5 pin is high, the
capacitor is nominally charged from 10% to 90% in 1.5µs.
If SLP1.5 is low, the rise and fall times are 10µs.
APPLICATION INFORMATION
Figure 2 shows a possible application
of the HI-8585/86 interfacing an ARINC
transmit channel from the HI-6010.
TRANSLATION
PROTECTION
VOLTAGE
ESD
AND
FIGURE 1 - LINE DRIVER BLOCK DIAGRAM
CONTROL
CONTROL
LOGIC
LOGIC
NULL
ZERO
NULL
ZERO
ONE
ONE
HOLT INTEGRATED CIRCUITS
HI-8585, HI-8586
SLP1.5
-5V
-5V
5V
5V
CURRENT
CONTROL
CURRENT
CONTROL
2
“B” SIDE
“A” SIDE
A unity gain buffer receives the internally generated
slopes and differentially drives the ARINC line. Current is
limited by the series output resistors at each pin. There
are no fuses at the outputs of the HI-8585 as exists on the
HI-8382.
The HI-8585 has 37.5 ohms in series with each output.
The HI-8586 has 10 ohms in series. The HI-8586 is for
applications where more series resistance is added exter-
nally, typically for lightning protection devices.
Both the HI-8585 and HI-8586 are built using high-speed
CMOS technology. Care should be taken to ensure the
V+ and V- supplies are locally decoupled and that the
input waveforms are free from negative voltage spikes
which may upset the chip’s internal slope control circuitry.
FIGURE 2 - APPLICATION DIAGRAM
2
8
4
3
6
7
5
4
1
HI-8585 = 37.5 OHMS
HI-8586 = 10.0 OHMS
HI-8585 = 37.5 OHMS
HI-8586 = 10.0 OHMS
1
5
8
6
7
2
3
TXAOUT
TXBOUT