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AM3357: About VoL and IoL related data

Part Number: AM3357

Hi,

In the data sheet for AM3357 (SPRS717L P.89), VoL is 0.45V when IoL of the signal is 4mA (VDDSHV6 = 1.8V).

Is there any specific data about the value of VoL when IoL is other than 0.45V?

Best Regards,

Kouji Nishigata

  • Hello Kouji,

    Please be more specific on which pins / signals you are asking about.

    Regards,

    Nick

  • Hi, Nick

    Thanks for the response.

    I was asked about "ECAP0_IN_PWM0_OUT, UART0_CTSn, UART0_RTSn, UART0_RXD, UART0_TXD, UART1_CTSn, UART1_RTSn, UART1_RXD, UART1_TXD, I2C0_SDA, I2C0_SCL, Regarding the "XDMA_EVENT_INTR0,XDMA_EVENT_INTR1,WARMRSTn,EXTINTn,TMS,TDO,USB0_DRVVBUS,USB1_DRVVBUS (VDDSHV6 = 1.8 V)" section.
    However, since we are talking about the design of the buffer when connecting the FPGA to the AM335x, it would be helpful to have data on the GPMC related pins as well.

    Best Regards,

    Kouji Nishigata

  • Hi, 

    I would like to know how things are going about the issue.

    Best Regards,

    Kouji Nishigata

  • The Vol value and operating condition defined in the datasheet is the only data point available. This parameter is validated by a forcing logic low state on the output while a 4mA current source is attempting to pull the output to its respective VDDSHV power rail. The output voltage is measured to confirm it is less than 0.45V.

    A 4mA current source is used for validating this parameter since 4mA is the largest DC current supported by these IO buffers.

    The output voltage will reduce as load current is reduced. Therefore, we know Vol will be between 0V and 0.45V as the load varies from 0mA to 4mA respectively. This is the only data point which we can provide.

    Regards,
    Paul  

  • hi,Paul

    Thank you for your answer.

    A question from our customers was, "How much should Iol be lowered in order to keep Vol less than 0.15V?"
    Do you have any data to answer even with this?

    Best Regards,

    Kouji Nishigata

  • As mentioned before, we do not have any other data points for this parameter.  We only check the output voltage while applying worst case current to see if the output voltage is compliant to JEDEC standards. This parameter is verified at worst case voltage, temperature, and process corners. 

    The customer would need to measure the output voltage with various loads on a few units until they find a current that satisfies their goal of 0.15V.  They may need to vary voltage and temperature operating conditions to represent worst case operating conditions expected for their product. They also need to provide some margin for process variation.

    Regards,
    Paul