Can 2 different BMXDDO1602 Module outputs still be directly paralleled together if their respective cards are on different drops (without diodes)?

[maks.chayun]

Say I wanted to implement a redundant I/O scheme where I paralleled two different BMXDDO1602 card outputs whose cards were located on two separate I/O drops (obviously on two different racks).

Assuming:
1) Their pre-actuator terminals were fed from the same power supply.

2) Both outputs are meant both be on or off simultaneously (no mixed states).

Could the outputs be paralleled together directly or would the output first have to go to two different diodes with their cathodes connected together?

I've read on the data sheet for the BMXDDO1602 that their outputs are parallelable (up to two), but I'm not sure if that was referring to outputs that were on the same card or not.

[dnordenberg1]

99% sure it would not matter if it would be from another card. If you are unsure, take something like 1kohm resistor between an enabled output and a disabled and check the current. If the current is like 100 microamps or below then you are fine, it will not cause any harm to parallel the outputs, if it is towards 20mA it is shorting, then turn off.

[GabrieleMicheli]

I suggest you take a look at these files, they are very interesting 🙂

[ProfHameedi]

If you look closely at the schematic circuit of the BMXDDO1602 module, you will see that the output terminals are the DRAIN pins of MOSFET transistors, so connecting (2) output pins together will not affect the internal circuit, especially the GATE circuits are different.

On the contrary, this scheme will enhance the operation and performance by Load Current sharing (Load Current will be divided by 2 pass through 2 transistors).