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MAX3221: About the time to output when switching from Automatic power down to normal operation.

Kengo.Y
Guru 11495 points

Part Number: MAX3221

Hi team,

I'd like to know about the automatic power down.

Could you tell me about the time to output when switching from Automatic power down to normal operation? 
I think the automatic power down is switched to normal mode by the input signal.

I want to know if I need a dummy signal to wake it up.

Sincerely.
Kengo.

  • 0
    TI__Guru 62118 points

    Kengo,

    After device remains in invalid signal state for more than 30us, device will enter auto-power down mode. 

    Please let me know if this answers your question.

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    Guru 11495 points

    Tyler,

    Thank you for your reply.
    No, 
     I'd like to know is how long it takes for the output to come back on after the auto-power down mode is restored.

    Sincerely.
    Kengo.

  • 0 in reply to Kengo.Y
    TI__Guru 62118 points

    Kengo,

    MAX3221 exits a power-down state when any valid signal is present on the receiver. While we don't specify this explicitly in the datasheet most likely due to the slow data rates of RS-232, I would think the timing would be similar to the output enable/disable timing spec typically ~200ns. The only exact way to know for sure would be to scope the input and output to see the time differential after coming out of a power-down state.

    Regards,

    Tyler