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BD429 Datasheet Preview

BD429 Datasheet

Line Driver

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Device
Engineering
Incorporated
430 S. Rockford Dr.
Tempe, AZ 85281
Phone: (480) 303-0822
Fax: (480) 303-0824
E-mail: admin@deiaz.com
www.DataSheet4U.com
BD429
ARINC 429/RS-422 Line Driver
Integrated Circuit
Features:
ARINC 429 Line Driver for HI speed (100 kHz) and LOW speed (12.5 kHz) data rates
Pin for Pin replacement part for industry standard ARINC 429 Line Drivers
Available in a 16 Pin SOIC (WB), 16 Pin CERDIP and 28L PLCC
Low EMI RS-422 line driver mode for data rates up to 100 kHz
Adjustable slew rates via two external capacitors
Inputs are TTL and CMOS compatible
Low quiescent power of 125mW (typical)
Programmable output differential range via VREF pin
Outputs are fused for failsafe overvoltage protection
Drives full ARINC load of 400and 30,000pF
-55°C to +125°C operating temperature range
100% Final Testing
General Description:
The BD429 ARINC Line Driver Circuit is a bipolar
monolithic IC designed to meet the requirements of
several general aviation serial data bus standards.
These include the differential bipolar RZ types such
as ARINC 429, ARINC 571, and ARINC 575, as well
as the differential NRZ types such as the RS-422
standard.
Table 1: Product Matrix Table
Product Matrix Table
Part Number Package Type
# of
Pins
BD429
CERDIP
16
BD429A
SOIC WB
16
BD429B
PLCC
28
© 1999 Device Engineering Inc.
430 S. Rockford Tempe, AZ 85281
1 of 11
BD429 Rev. B
March 24, 2000




DEI

BD429 Datasheet Preview

BD429 Datasheet

Line Driver

No Preview Available !

Functional Description:
Modes: The BD429 operates in either a 429 mode or a 422 mode as controlled by the 429/422´ pin.
429 Mode: In 429 mode, the serial data is presented on the DATA(A) and DATA(B) inputs in the dual rail
format defined in the MARK 33 Digital Information Transfer System – ARINC Specification 429-10. The
driver is enabled by the SYNC and CLOCK inputs. The output voltage level is programmed by the VREF
input and is normally tied to +5VDC along with V1 to produce output levels of +5 volts, 0 volts, and –5
volts on each output for ±10 volts differential outputs. *See figure 2.
422 Mode: In 422 mode, the serial data is presented on DATA(A) input. The driver is enabled by the
SYNC and CLOCK inputs. The outputs swings between 0 volts and +5 volts if VREF is at +5VDC. *See
www.DataSheet4U.cofmigure 3.
Output Resistance: The driver output resistance is 75±20% at room temperature; 37.5on each out-
put. The outputs are also fused for failsafe protection against shorts to aircraft power. The output slew
rate is controlled by external timing capacitors on CA and CB. Typical values are 75pF for 100 KHz data
and 500pF for 12.5 KHz data.
Pin Name
VREF
Table 2: Pin Descriptions
Description
Analog Input. The voltage on VREF sets the output voltage levels on AOUT and BOUT. The output
logic levels swing between +VREF, 0 volts, and –VREF volts.
NC No Connect
SYNC
Logic input. Logic 0 forces outputs to NULL state. Logic 1 enables data transmission.
DATA(A)
DATA(B)
CA
CB
AOUT
BOUT
Logic inputs. These signals contain the Serial Data to be transmitted on the ARINC 429 data bus.
Refer to Figures 2 and 3.
Analog Nodes. External timing capacitors are tied from these points to ground to establish the out-
put signal slew rate. Typical CA = CB = 75pF for 100 kHz data and CA = CB = 500pF for 12.5 kHz
data. *
Outputs. These are the line driver outputs which are connected to the aircraft serial data bus.
-V Negative Supply Input. –15VDC nominal.
GND
Ground.
+V Positive Supply Input. +15VDC nominal.
CLOCK Logic input. Logic 0 forces outputs to NULL state. Logic 1 enables data transmission.
429/422'
Logic Input. Mode control for ARINC 429 and RS-422 modes. An internal 10Kpull up resistor
keeps the chip in ARINC 429 mode when there is no external connection. This creates a default
logic 1, enabling the ARINC 429 mode. A forced logic 0 enables the RS-422 mode.
V1 Logic Supply Input. +5VDC nominal.
*CA and CB pin voltages swing between ±5 volts. Any electronic switching of the capacitor on the pins must not inhibit the full voltage swings.
© 1999 Device Engineering Inc.
430 S. Rockford Tempe, AZ 85281
2 of 11
BD429 Rev. B
March 24, 2000


Part Number BD429
Description Line Driver
Maker DEI
Total Page 11 Pages
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