HI-3188PSIF HOLTIC [Holt Integrated Circuits], HI-3188PSIF Datasheet - Page 2

• Manufacturer Part Number: HI-3188PSIF
• 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, including the power enable (
are TTL/CMOS compatible.
Figure 1 illustrates a typical ARINC 429 bus application.
Three power supplies are necessary to operate the HI-3182;
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
ohms depending on the option chosen. The rise and fall times
of the outputs can be calibrated through the selection of two
external capacitor values th
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 can be put in a tri-state mode by applying
a logic high to the
being used, the pin should be tied to ground. The
REF
DATA (A)
DATA (B)
STROBE
other than +5V is needed, a separate +5V power supply
A
CLOCK
SYNC
V
1
OUT
B
REF
will switch to the +V
A
1
A
STROBE
rail (ARINC HIGH state). With both data
HI-3182, HI-3183, HI-3184, HI-3185, HI-3186, HI-3187, HI-3188
REGULATOR
B
CURRENT
B
at a
input pin. If this feature is not
re connected to the C and C
OUT
, is nominally 75, 26 or 0
V
GND
REF
REF
LEVEL SHIFTER
LEVEL SHIFTER
rail and B
CONTROL (A)
CONTROL (B)
AND SLOPE
AND SLOPE
REF
STROBE
+V
-V
. If a value of
HOLT INTEGRATED CIRCUITS
STROBE
C
C
A
OUT
A
B
) input,
The
will
B
HI-3186, HI-3187, HI-3188
Figure 2. FUNCTIONAL BLOCK DIAGRAM
2
function is not available in the 14 & 16-pin SOIC package
configurations where the pin is internally connected to
ground.
The ARINC outputs of the HI-3182, HI-3184 and HI-3187 are
protected by internal fuses capable of sinking between 800 -
900 mA for short periods of time (125 s).
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.
Shorted on
DATA (A)
DATA (B)
DRIVER (B)
DRIVER (A)
HI-3183, HI-3186
HI-3187, HI-3188
INPUTS
OUTPUT
OUTPUT
Figure 1. ARINC 429 BUS APPLICATION
Shorted on
24.5W
24.5W
V
+5V
REF
C
A
V
C
1
B
SYNC
GND
STROBE
HI-3183, HI-3185
HI-3186, HI-3188
13W
13W
CLOCK
Shorted on
+15V
-15V
+V
-V
m
F
F
A
B
TO ARINC BUS
1
A
B
OUT
OUT
A
B
C
OUT
OUT
L
R
L