BD429英文数据手册_ARINC429总线采集芯片

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DS-MP-00429 Rev. F

03/11/2004

1 of 12

Device

Engineering

Incorporated

BD429/BD429A/BD429B

ARINC 429/RS-422 Line Driver

Integrated Circuit

385 E. Alamo Drive

Chandler, AZ 85225

Phone: (480) 303-0822

Fax: (480) 303-0824

E-mail: admin@deiaz.com

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, 16 Pin Plastic Dip,

16 Lead Ceramic SOP, 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 V

REF

• Outputs are fused for failsafe overvoltage protection

• Drives full ARINC load of 400Ω and 30,000pF

• Extended (-55°C/+85°C) and Military (-55°C/+125°C) temperature ranges

• 100% Final Testing

Figure 1: BD429 Block Diagram

DS-MP-00429 Rev. F

03/11/2004

2 of 12

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 V

REF

input and is normally tied to +5VDC along with V

to produce output levels of +5 volts, 0 volts, and –5 volts

on each output for ±10 volts differential outputs. *See figure 4.

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 V

REF

is at +5VDC. *See

figure 5.

Output Resistance:

The driver output resistance is 75Ω ±20% at room temperature; 37.5Ω on 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 C

and C

. Typical values are 75pF for 100 KHz data

and 500pF for 12.5 KHz data.

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.

429/422'

NOTE 1

SYNC

NOTE 2

CLOCK

NOTE 2

DATA(A)

NOTE 2

DATA(B)

NOTE 2

OUT

COMMENTS

REF

-V

REF

-V

REF

NULL

LOGIC 1

LOGIC 0

REF

NULL

LOGIC 0

LOGIC 1

NOTES:

1. The 429/422' pin is internally pulled up to V

through a 10kΩ resistor. So, if no external connection is made to this pin, it will

force the chip into the 429 mode.

2. X = Don’t care.

Table 1: Truth Table

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