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SN74AUP1G74: safety parameters

Firas Hamdi
Prodigy 10 points
Part Number: SN74AUP1G74

Tool/software:

For a client's project, we are currently working on ISO13849 certification for a product. Briefly about ISO13849, it's a standard covering the safety of machinery and touching the principles of safety design. One of our safety functions is using the flip-flop SN74AUP1G74, and for design we need some information about the product related to safety.
If available, can you provide us with:
- MTTFd (Mean Time To Dangerous Failure)
- PFHd (Probability of a Dangerous Failure per Hour)
- DC (Diagnosis Coverage)
We would appreciate to have this information if available

Best regards,
Firas Hamdi

  • 0
    Guru 316440 points

    This device, by itself, is never dangerous.

    You have to specify which (failure or normal) states of the flip-flop are dangerous, when viewing the device as a whole, and only then can you try to find out how probable these particular states are.

  • 0 in reply to Clemens Ladisch
    Prodigy 10 points

    Thank you for the reply.

    Can I have an estimation about the lifespan of the flip-flop? we could not find this information in the datasheet. Typical lifespan of course, assuming the flip flop is well integrated in the HW design and protected from moisture and electronic discharge.

    I am asking about this  because if the flip-flop stops working due to lifespan expiration, then that can be considered as dangerous state for our application (and that case would be equivalent to the MTTFd).

    Thanks in advance

  • 0 in reply to Firas Hamdi
    TI__Genius 9311 points

    Hi Firas,

    You can find information on the lifespan and failure rate for TI devices here: https://www.ti.com/quality/docs/estimator.tsp?opn=SN74AUP1G74DCTR&cpn=&partNumber=SN74AUP1G74#resultstable

    Best,

    Ian

  • 0 in reply to Ian Graham
    Prodigy 10 points

    Hi Ian,

    Thanks for the link.

    I find difficulties understanding some information from the results table.

    - What is the unit of the MTBF? (seconds?)

    - What does Failures In Time refer to? I can't understand the unit there

    - Is it possible to extract the lifespan of the product from the results table provided?

    Thanks in advance.

    Best regards,

    Firas

  • 0 in reply to Firas Hamdi
    TI__Genius 9311 points

    Hi Firas,

    MTBF is measured in hours. Failures in time in the number of failures one would expect to observe per 10^9 device-hours. Essentially, its 1/MTBF. It is measured in device-hours because the more devices you are sampling, the more failures will appear in 10^9 hours. If you are studying 10^9 devices, for example, you would expect to see 2.2 of the devices fail every hour.

    TI does not provide specific product lifespans, but the mean operational time for a device to fail is 4.59*10^8 hours, or around 53000 years, so I wouldn't expect the device to fail within the lifetime of the end product.

    Best,

    Ian