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[FAQ] AM62L32, AM62L31: PORz and RTC_PORz slew rate

Kallikuppa Sreenivasa
Guru**** 174914 points
Part Number: AM62L

Tool/software:

Hi TI Experts, 

Usually add RC filter on RESET signal to anti-noise, but the slew rate requirement of RESET signal on AM62x datasheet is quite sharp, on customer board it is about 10V-100V/ms, can it meet AM62x reset requirement, if not please help to explain the basic mechanism. 

  • 0
    TI__Guru**** 174914 points

    Hi Borad Designers,

    There can be long-term reliability issues associate with the input buffer if the applied signal spends too much time in the voltage region between VIHSS and VILSS. The maximum transition time allowed is 1000ns. I recommend driving the reset input with a push-pull buffer that produces a signal transition rate that is faster than 5ns to eliminate the risk of noise coupling into the signal as it transitions through the input buffer switching threshold.

    A 22 pF glitch filter is recommended at the input of PORz and RTC_PORz.

    Regards,

    Sreenivasa

  • +1 in reply to Kallikuppa Sreenivasa
    TI__Guru**** 174914 points

    Hi Borad Designers,

    Connecting PORz and RTC_PORz when low power modes are not used

    PORz 

    RTC_PORz

    PORz is fail-safe and 3.3V tolerant

    When any of the low power modes are not used, the recommendation is to connect a 1.8V reset input signal to both PORz and RTC_PORz.

    Regards,

    Sreenivasa