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DEI1188-SMS

DEI1188SMS is an 8-channel, Discrete-to-Digital interface IC implemented in an HV DIMOS technology. It senses eight GND/OPEN discrete signals of the type commonly found in avionic systems and converts them to serial logic data. The discrete data is read from the device via an eight-bit serial shift register with 3-state output. This serial interface is compatible with the industry standard Serial Peripheral Interface (SPI) bus.


Features

  • Eight discrete inputs
    • Senses GND/OPEN discrete signals.
    • Meet input threshold and hysteresis requirements specified per Airbus ABD0100H specification.
      • Thresholds: 4.5 V / 10.5 V, Hysteresis: 3V
    • 1 mA input current to prevent dry relay contacts.
    • Internal isolation diode.
    • Uses external series 3 kΩ resistors on inputs to implement lightning transient immunity of DO160, Section 22 Level 3, and higher levels with the addition of small TVS devices.
    • Inputs protected from Lightning Induced Transients per DO160E, Section 22, Cat A3 and B3 plus waveform 5A to 500 V.
  • Serial I/O interface to read data register
    • Direct interface to Serial Peripheral Interface (SPI) port.
    • TTL/CMOS compatible inputs and Tristate output
    • 10 MHZ Max Data Rate
    • Serial input to expand Shift Register
  • Pin compatible with DEI1066
  • Logic Supply Voltage (VCC): 3 V +/-5%
  • Analog Supply Voltage (VDD): 0 V to 16.5 V
  • 16L SOIC EP package

Attributes

temp range: -55 to 85
product package type: 16 SOIC EP NB
burn in:
channels: 8
lightning protection:
Years to EOL: 10
tri state outputs:
fused outputs:
analog psu: 12-16.5
digital psu: 3.3
ABD0100:
discrete input: OPEN/GND
output type: serial
prog input threshold:
package description: 16 Pin Plastic SOIC - .150 Body Exp Pad
package type: Surface Mount
ds doc number: DS-MW-01188-01
JEDEC: MS-012-AC
RoHS:
product status: Active

Functional Description

DEI1188 is an eight-channel discrete-to-digital interface IC implemented in an HV DIMOS technology.  It senses eight GND/OPEN discrete signals of the type commonly found in avionic systems and converts them to serial logic data.  The discrete data is read from the device via an eight-bit serial shift register with 3-state output. This serial interface is compatible with the industry standard Serial Peripheral Interface (SPI) bus.  

The discrete input circuits are designed to achieve a high level of lightning transient immunity.  The application design provides a series 3 kΩ resistor on each discrete input to achieve DO160E Level 3 and WF5A 500 V immunity.  Higher immunity levels can be achieved (i.e. Level 5) with the addition of a TVS between the resistor and the input pin.

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