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Original question:

54AC245 and 54LVTH244A IBIS MODELS/ Flight vs. Commerical

SN54LVTH244A-SP: power supply rise time

Michael T Schneider
Expert 3780 points
Part Number: SN54LVTH244A-SP

Team,

Quick question from my customer:

The data sheet for the 54LVTH244A has the following requirements under recommended operation for power supply rise time:

What is the impact to part functionality if the power system does not meet this requirement?  We are not using the  Ioff and Power-Up 3-State Hot Insertion capabilities of the device in our application.

Thanks for your help

  • 0
    TI__Guru* 96842 points

    Hi Michael,

    The application report "Power-Up 3-State (PU3S) Circuits in TI Standard Logic Devices" has some detailed information about this.

    You say you aren't using Ioff or Power-Up 3-State, but those aren't feature you can just turn off. They are inherent to the design of the device and will do their jobs every time the power is cycled. To quote the above application report (page 7): With a very fast ramp rate, the [PU3S internal] capacitors may not have sufficient time to stabilize, and the output of the power-up circuitry may turn on the device output earlier than desired.

    If your system doesn't have an issue with the buffer coming on during power-up, then this is fine. It will not damage the TI device.