HI-8585CDI データシートの表示（PDF） - Holt Integrated Circuits
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HI-8585CDI Datasheet PDF : 8 Pages
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HI-8585, HI-8586
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.
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.
ESD
PROTECTION
AND
VOLTAGE
TRANSLATION
ONE
NULL
ZERO
CONTROL
LOGIC
5V
“A” SIDE
CURRENT
CONTROL
-5V
SLP1.5
HI-8585 = 37.5 OHMS
HI-8586 = 10.0 OHMS
TXAOUT
ONE
NULL
ZERO
CONTROL
LOGIC
5V
“B” SIDE
CURRENT
CONTROL
-5V
HI-8585 = 37.5 OHMS
HI-8586 = 10.0 OHMS
FIGURE 1 - LINE DRIVER BLOCK DIAGRAM
TXBOUT
APPLICATION INFORMATION
Figure 2 shows a possible application
of the HI-8585/86 interfacing an ARINC
transmit channel from the HI-6010.
1
2
6
8
7
4
3
5
1
6
7
8
2
3
45
FIGURE 2 - APPLICATION DIAGRAM
HOLT INTEGRATED CIRCUITS
2
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