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DEI1271A-MMS-G

The DEI1270A-MMS-G & DEI1271A-MMS-G are Dual Line Drivers designed to directly drive the ARINC 429 avionics serial digital data bus. The bipolar device converts TTL/CMOS serial input data to the tri-level RZ bipolar differential modulation format of the ARINC bus. A TTL/CMOS control input selects the output slew rate for HI (100KBS) and LOW (12.5KBS) speed operation. No external timing capacitors are required. A429 output tri-state capability is enabled by the TS_CTL input.


Features

  • Dual TTL/CMOS to ARINC 429 Line Driver
  • HI/LO Speed Control Pins for Hi (100KBS) or Lo (12.5KBS) speed slew rates
  • ±9.5V to ±16.5V supplies
  • Drives full ARINC load
  • Output resistor options: 0, 10 or 37.5 Ohms
  • Tristate Output feature
  • Thermally enhanced 5 x 7 mm MLP package
  • The DEI1270A family is an improved version of the popular DEI1270 family

Attributes

temp range: -55 to 125
product package type: 38 5x7 I MLPQ G
burn in:
channels: 2
power supply range: +/-9.5 to +/-16.5
lightning protection:
Years to EOL: 10
output resistance: User Selectable: 0, 10, 37
tri state outputs:
fused outputs:
ABD0100:
package description: 38 Pin 5 X 7 Micro Lead Frame Package - Quad
package type: Surface Mount
ds doc number: DS-MW-01270-02
JEDEC: MO-220C
RoHS:
product status: Active

Functional Description

The DEI1270A/DEI1271A bipolar integrated circuits are dual line drivers designed to directly drive the ARINC 429 avionics serial digital data bus.  The device converts TTL/CMOS serial input data to the tri-level RZ bipolar differential modulation format of the ARINC bus. A TTL/CMOS control input selects the output slew rate for HI (100KBS) and LOW (12.5KBS) speed operation.  No external timing capacitors are required.  A429 output tri-state capability is enabled by  the TS_CTL input.

The DEI1270A/1A Line Drivers are an improved version of the popular DEI1270/1 family.  They provide:

  • Lower power consumption
  • Excellent waveform fidelity
  • Improved transient immunity. This improvement simplifies the equipment design for lightning and RF immunity requirements.  

The Line Driver provides output resistor values and output tri-state capability (see table 1).  There are three output resistor options: 0Ω, 10Ω and 37Ω.   The 0Ω and 10Ω versions require external resistors to achieve the 37Ω output resistance of the ARINC 429 standard.  The external resistors are normally used to simplify the external transient voltage protection network.   The outputs are tri-state capable. This feature is useful in non-standard applications where there are multiple drivers on a wire pair.

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