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AM572x I/O specifications

shigehiro tsuda
Mastermind 9490 points
Other Parts Discussed in Thread: AM5728

Hi,

There are following mentions in Table 5-4 Recommended Operating Conditions of the data sheet of AM5728.

The specifications of this VDDSHV10 list it with Maximum noise (peak-peak) 50mVppmax.

Which is correct as a definition of Maximum noise of MAX_DC or MAX of 3.3V?
MAX_DC
①3.30V +50mV = 3.35V
②3.366V +50mV = 3.416V

MAX
①3.30V +50mV = 3.35V
②3.465V +50mV = 3.515V

Best Regards,
Shigehiro Tsuda

  • 0
    TI__Guru**** 393215 points
    Hi,

    Check Notes 2 and 3 below Table 5-4.
  • 0 in reply to Biser Gatchev-XID
    Mastermind 9490 points

    Hi Biser,

    Thank you for quick reply.

    The contents of your answer have already looked and post this question because it was not able to be understood.
    Because IO power supply design is not possible, will you define it with numerical value?
    Please tell the DC voltage of MAX_DC and MAX the allowable maximum voltage including noise.
    Because it is important by the design of our customer,I would like the clear answer that you can guarantee.

    Best Regards,
    Shigehiro Tsuda

  • 0 in reply to shigehiro tsuda
    TI__Guru**** 393215 points

    MAX Voltage: Voltage at the device ball should never be below the min. MAX voltage or above the max. MAXC voltage for any amount of time. This requirement includes dynamic voltage events such as AC ripple, voltage transients, voltage dips, etc.

    MAX DC Voltage: Voltage at the device ball should never be above the MAX DC voltage to avoid impact on device reliability and lifetime POH (Power on Hour). The MAX DC voltage is defined as the highest allowed DC regulated voltage, without transients, seen at the ball.

  • 0
    TI__Genius 13567 points
    Hi Shigehiro,
    Notes 2 and 3 from Table 5-4 give the following definition:
    Max voltage at device pins without noise = 3.366V
    Max voltage at pins with supply noise (50mV PEAK-TO-PEAK) = 3.366 +/- 25mV = 3.391V
    Max voltage at pins with supply noise and transient spike = 3.465V

    If your supply is 3.366V and noise is 50mV pk-pk then this is OK. If the supply is 3.367 and noise is 50mV pk-pk this is not OK. If a transient causes +100mV spike then 3.491V is seen on the device pins and this is not OK either.
  • 0 in reply to Ahmad_Rashed
    Mastermind 9490 points

    Hi Ahmad,

    Thank you for your reply.

    I understand these specifications from your answer.

    I am grateful for your response.

    Best Regards,
    Shigehiro Tsuda