Dear specialists,
My customer is considering MAX232IDR and has a question.
I would be grateful if you could advise.
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What is the maximum rating of the sink current of the driver / receiver OUT terminal?
I looked at the data sheet, but couldn't find where it was listed.
I would like to know the TxOUT and RxOUT absolute maximum rated values.
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I appreciate your great help in advance.
Best regards,
Shinichi
HI Shinichi,
Clemens is correct - when using this device under rated operating conditions there isn't a direct current spec:
1. Output impedance on Driver Outputs is min 300 Ohms - which under typical conditions would be (+/-7)/300 = +/-23.33mA in the cases of short circuit (where the value Clemens quoted is a more "worst" case approximation which still isn't in a worrying range for current.
2. Input impedance is minimum 3K on the receivers (RIN) and are rated up to +/-30V so the max current is +/-1mA (due to the other specs)
3. For the Driver Inputs and the Receiver Outputs its going to be similar:
They are listed as TIN and ROUT (Non-highlighted parts)
Rout doesn't have a limit but was tested at a few mA (3.2mA highest current tested). More current than that could result in reduced performance from datasheet.
4. The one caveat is that while there isn't a strict rating - there is a strict rating on junction temperatures so if the junction heats up too much due to ambient temperature, current through device, and board layout there could be damage - but this isn't a super common occurrence and generally 1 of the other specs is violated to get to that high of a junction temperature - but it isn't necessarily impossible otherwise.
Best,
Parker Dodson
