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RM3183

Features: • Converts ARINC levels to serial data• Adjustable noise filters• TTL and CMOS compatible outputs• Built-in test inputs• Input protection circuitry• Mil-Std-883B screening available• 20-pin DIP and LCC packages available• Dice with Mil visu...

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RM3183: Features: • Converts ARINC levels to serial data• Adjustable noise filters• TTL and CMOS compatible outputs• Built-in test inputs• Input protection circuitry• Mil...

RM3183 Data Sheet

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Part Number:
RM3183
Supply Ability:
5000

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Product Details

Description



Features:

• Converts ARINC levels to serial data
• Adjustable noise filters
• TTL and CMOS compatible outputs
• Built-in test inputs
• Input protection circuitry
• Mil-Std-883B screening available
• 20-pin DIP and LCC packages available
• Dice with Mil visual screening available


Application

`The standard connections for the RM3183 are shown in Figure 1. Dual supplies from ±12 to ±15 VDC are recommended for the ±VS supplies. Decoupling of all supplies should be done near the IC to avoid propagation of noise spikes due to switching transients. The ground connections should be sturdy and isolated from large switching currents to provide as quiet a ground reference as possible.

`The noise filter capacitors are optional and are added to provide extra noise immunity by limiting the noise bandwidth of the input signal before it reaches the comparator.

`Two capacitors are required for each channel and they must all be the same value. The suggested capacitor value for a 100 KHz operation is 39 pF, which will give a noise bandwidth of approximately 800 KHz. For lower data rates, larger values of capacitance may be used to yield better noise performance. To get optimum performance, the following equation should be used to calculate capacitor value for a specific data rate: The RM3183 can be used with Raytheon's RM3182 Line Driver to provide a complete analog ARINC 429 interface.

`A simple application which can be used for systems requiring a repeater-type circuit for long transmissions or test interfaces is given in Figure 2. More RM3182 drivers may be added to test multiple ARINC channels, as shown.

`An all digital IC is available which forms a complete receiver system when combined with the RM3183. The Thomson EF4442 is a four channel ARINC 429 receiver IC which contains all the digital circuitry required to interface with an 8-bit processor. Each channel consists of a 32-bit register, an 8-bit status word comparator, and a 24-bit latch.

`A multiplexer and 8-bit data bus buffer form the interface to the system microprocessor. Figure 3 shows a typical ARINC application having both transmit and receive functions using four ICs: the EF4442, the RM3182 driver and two RM3183 dual receivers.


Pinout

Connection Diagram


Specifications

Parameter Min. Max. Units
Supply Voltage +VS   +20 VDC
VS   -20 VDC
+VL   +7 VDC
Operating Temperature Range -55 +125
Storage Temperature Range -65 +150
Input Voltage Range   ±50 V
Output Short Circuit Duration Not protected
Internal Power Dissipation   900 mW
Lead Soldering Temperature (60 seconds)   +300



Description

The RM3183 is a dual line receiver designed to meet all requirements of the ARINC 429 interface specification.

RM3183 contains two independent receiver channels which accept differential input signals and converts them to serial TTL data.

Input overvoltage protection is provided by special circuitry including dielectrically-isolated thin-film resistors and clamping diodes. Self-test logic inputs are provided by RM3183 for internal system tests. These inputs force the outputs to either a high, a low, or a null state for off-line system tests.

Input noise filtering is accomplished with external capacitors.

Two are required for each channel and can be adjusted for best noise immunity at a specific data rate.

Three power supplies are needed plus ground. The input thresholds depend only on the logic supply, so a wide range of dual supplies can be accommodated.

The Raytheon RM3183 line receiver is the companion chip to the RM3182 line driver. Together they provide all the analog functions needed for the ARINC 429 interface.

Digital data processing involving serial-to-parallel conversion and clock recovery can be accomplished using one of the ARINC interface ICs available or by discrete or gate array implementations.




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