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SN74LVC1T45: Slow slew rate input signal

Toshihiro Watanabe
Genius 10235 points
Part Number: SN74LVC1T45

Hello,

I think scba004d point is that input open or slow slew rate signal causes oscillating or heating-up which worse reliability. Is my understanding correct?

I think SN74LVC1T45 doesn't heating-up if the oscillation doesn't occur because delta-Icc = 50uA.

I think TI can't guarantee the product if datasheet condition doesn't satisfied including Input transition rise or fall rate. I would like to know the device may have failure possibility if no oscillation condition, no guarantee situation.

Best regards,

Toshihiro Watanabe

  • 0
    TI__Genius 16735 points

    Hello,

    A slow input transition rise or fall rate is damaging to the device.  When switching a CMOS device from an ON state to an OFF, the input crosses the threshold region, causing the N-channel and the P-channel to turn on simultaneously, generating a current path between VCC and GND. This current surge can be damaging, depending on the length of time that the input is in the threshold region.

    In the image below the current follows the red arrow as it makes it way directly from Vcc to GND since both the FETS are on. With a slow input, this current surge can last for a long period of time and damage the device.

    Thanks!

    - Karan