HI-3182PSTF-N HOLTIC [Holt Integrated Circuits], HI-3182PSTF-N Datasheet - Page 2

• Manufacturer Part Number: HI-3182PSTF-N
• Description: ARINC 429 DIFFERENTIAL LINE DRIVER
• Manufacturer: HOLTIC [Holt Integrated Circuits]

FUNCTIONAL DESCRIPTION
The SYNC and CLOCK inputs establish data synchronization
utilizing two AND gates, one for each data input (figure 2).
Each logic input is TTL/CMOS compatible.
Figure 1 illustrates a typical ARINC 429 bus application.
Three power supplies are necessary to operate the HI-318X;
typically +15V, -15V and +5V. The chip also works with ±12V
supplies. The +5V supply can also provide a reference
voltage that determines the output voltage swing.
differential output voltage swing will equal 2V
V
is required for pin V .
With the DATA (A) input at a logic high and DATA (B) input at a
logic low, A
switch to the -V
input signals at a logic low state, the outputs will both switch to
0V (ARINC NULL state).
The driver output impedance, R
The rise and fall times of the outputs can be calibrated through
the selection of two external capacitor values th
connected to the C and C input pins. Typical values for
high-speed operation (100KBPS) are C = C = 75pF and for
low-speed operation (12.5 to 14KBPS) C = C = 500pF.
The C and C pins swing between +5V and ground allowing
the switching of capacitor values with an external single-
supply analog switch.
The ARINC outputs of the HI-3182, are protected by internal
fuses capable of sinking between 800 - 900 mA for short
periods of time (125 s).
REF
DATA (A)
DATA (B)
other than +5V is needed, a separate +5V power supply
A
CLOCK
SYNC
V
1
OUT
B
REF
will switch to the +V
1
m
rail (ARINC HIGH state). With both data
A
REGULATOR
CURRENT
B
OUT
, is nominally 75 ohms.
V
GND
REF
REF
A
A
LEVEL SHIFTER
LEVEL SHIFTER
rail and B
CONTROL (A)
CONTROL (B)
HI-3182PSx-N, HI-3185PSx-N
AND SLOPE
AND SLOPE
REF
B
B
+V
-V
. If a value of
HOLT INTEGRATED CIRCUITS
C
C
OUT
A
B
at a
The
will
re
Figure 2. FUNCTIONAL BLOCK DIAGRAM
2
The Vref pin has an internal pull-up resistor to V+, allowing the
use of a simple external zener diode to set the reference
voltage.
POWER SUPPLY SEQUENCING
The power supplies should be controlled to prevent large
currents during supply turn-on and turn-off. The
recommended sequence is +V followed by V , always
ensuring that +V is the most positive supply. The -V supply is
not critical and can be asserted at any time.
DATA (A)
DATA (B)
DRIVER (B)
DRIVER (A)
INPUTS
OUTPUT
OUTPUT
Figure 1. ARINC 429 BUS APPLICATION
24.5W
24.5W
V
+5V
REF
C
A
V
C
1
B
SYNC
GND
13W
13W
CLOCK
HI-3185PSx-N
Shorted on
+15V
-15V
+V
-V
F
F
A
B
TO ARINC BUS
A
B
OUT
OUT
1
A
B
C
OUT
OUT
L
R
L