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UCC27210: voltage levels

sravani datla
Prodigy 100 points
Part Number: UCC27210

Sir,

It is given that ucc27210 is pseudo CMOS compatible. So how input voltage levels should be? Is it 0V( at LOW state) to 5V(at HIGH state) or is it 3.2V(at LOW state) to 5V(at high state) . Thank you in advance.

  • 0
    TI__Mastermind 20950 points

    Hello Sravani,

    Thank you for the interest in the UCC27210. I am supporting this device and will look to answer your questions.

    As you mention the UCC27210 is the psudo CMOS input which provides higher thresholds and higher hysteresis, which can help with noise immunity.

    The typical thresholds are as you mention, 5.0V rising and 3.2V falling threshold. You need to keep in mind the maximum rising threshold is 5.8V and the minimum falling threshold is 2.4V.

    Normally you would expect an input signal to be close to ground for the low signal and at some given level for a high state. For the UCC27210 to accommodate the worst case thresholds you need an input signal with >5.8V in the high state. For the low state switching close to ground would be typical, there is no need to have a level shifted low state; the 3.2V low threshold  just helps with noise immunity to ringing and noise spikes on the input signals to the driver.

    Please confirm if this answers your questions by selecting the green button on the thread.

    Regards,

    Richard Herring