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CD4555B-MIL: If one of the channels fails, is the other one isolated enough that it will still function?

Part Number: CD4555B-MIL

Greetings!

My customer has the following questions about the CD4555B-MIL:

If one of the channels fails, is the other one isolated enough that it will still function?

Are there specific failure modes where this is the case and others where it is not?

Thanks for your help.

Best regards,

Jim B

  • The two decoders are somewhat separated, but they share the same power supply:

    If you overload an output transistor, it's possible that only that transistor burns out. However, all currents go through VDD and VSS, so this cannot be guaranteed.

    If over- or undervoltages happen at any input or output pin, the ESD protection diodes will shunt the current to the supply. It's possible that the diodes burn out first, but, again, this cannot be guaranteed.