IR104 - Frequently Asked Questions

  1. What is the power consumption of the IR104?

  2. What is the minimum and maximum and input voltages, both DC and AC for the optocoupled inputs?

  3. What is the operating temperature range of the IR104?

  4. What is the purpose of connector CN3?

 

Q. What is the power consumption of the IR104.

A. Power consumption of the IR104 with 5V Relays

Base Current drawing from 5V:                                     77mA

Current drawing from all 20 relays active:                   750mA

Current drawing from all 20 optocouplers active:           7mA

                                                    Total max consumption:       834mA   
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Q. What is the minimum and maximum and input voltages, both DC and AC for the optocoupled inputs?

A. The input range is 3 to 24V.  The input voltage is limited by the heat dissipation of the current limiting resistors.  Since AC voltage is referred to in RMS, the power dissipation of 24VAC is the same as 24VDC.  Therefore the input range is the same for both AC and DC input voltages.
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Q. What is the operating temperature range of the IR104?

A: The relays used on the IR104 are the limiting factor for the temperature
range.  They are rated for use between –25C to 70C (-13F to 158F)
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Q. What is the purpose of connector CN3?

A. Connector CN3 is used in the production process to program the Lattice PLD IC on the IR104. 

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