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DS8922A Voltage

Sukjae Yoon
Prodigy 30 points

Hi.

I'm going to use DS8922A for RS422.

but little confused in DATAsheet(Page3, Absolute Maximum Ratings)

In DATAsheet the maxium Ouput Voltage is 5.5V

What if I drvie 3V to DS8922A?? Is output voltage going to be 5.5V?? or This chip can support until 5.5V?

and I think Receiver Input Voltage and Differential Input Voltage are same. What is the difference?

Plz Answer

  • 0
    TI__Mastermind 43795 points

    The minimum input levels for proper output operation are VIL = 0.8 and VIH = 2.0V.  Typically the input is driven from a LVCMOS or CMOS source with a typical VIL/VIH of 0.0/3.3V or 0.0/5.0V respectively.  The typical output voltage is determined by the output current loading and DS8922A VCC supply voltage. 

    For an application with a 100 ohm load, the output voltage will typically be as shown in the datasheet.

    For resistive loads > 100 ohms the output voltage will greater.

    For resistive loads < 100 ohms the output voltage will be less

    If there is an open circuit on the output pins and the VCC supply voltage is equal to 5.5V, then it is possible for the output voltage to be as high as 5.5V as well.

    You are correct, the Receiver Input Voltage is measured differentially there is no difference.

    Regards,

    Lee