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SN54LVTH244A-SP: sn54lvth244a-sp

Selwyn Khaw
Prodigy 90 points
Part Number: SN54LVTH244A-SP

sn54lvth244a-sp data sheet page 7 notes mentions test condition for input transition time to be less than 2.5 nsec.

C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.


issue: I am auditing a design that drives inputs of this device with transition time of 160 nsec (10%-90%).

Q1: What is the maximum transition time for this device for reliable operation (no chatter).

Q2: What is the maximum transition time for this device to ensure no damage due to idling in input threshold voltage range and associated shoot thru.


Thank you.

-Selwyn

  • 0
    TI__Guru 62930 points

    Selwyn,

    The recommended operating conditions has this information:

    Using 10-90% at 3.3v, the max allowed time for this transition to meet recommended operating conditions would be 0.8*3.3*10ns = 26.4ns.

    This document discusses the issues associated with this and limits based on logic family:

    www.ti.com/.../getliterature.tsp

    If this answers your question, please click "Verify it as the answer"
    Regards,
    Wade