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TPS3840: Supervisor/Reset IC to generate fix period reset pulse

Part Number: TPS3840

Hi team,

our customer is looking for reset IC generate output pulse period 10uS ~ 2500uS but trigger from MR falling edge. 

timing diagram as below, we suggested TPS3840 as solution, however TPS3840 output pulse will also depend on MR period. 

Do we have solution can trigger MR falling edge and generate fix period pulse between 10uS ~ 2500uS? thanks. 

Eddie 

  • Hi Eddie,

    When you customize the reset delay of the device, the length of the MR pulse on it has no effect. This means that you should be able to adjust your fixed pulse and use MR to trigger it.

    Thanks,
    Abhinav.

  • Hi Abhinav,

    Thanks, however datasheet show tMR_tD timing spec. (Delay from release MR to deasert reset) , so  reset "low" period will not able to control if MR is longer than desired reset period.

    Eddie

  • Hello Eddie,

    Please refer TPS3422EG device for the above requirement.

    The device will react to falling edge of MR pin if Push Button times is set to 0 sec.

    Pull TS = VCC to change t-timer = 0s

    The RESET time if fixed at 400ms TYP for this device. This is higher than the range you specified. Please check if this will work.

    We can continue our discussion offline if required.

    Thanks & Regards,

    Shridhar.