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TLV7041-Q1: Functional safety information

ArTzy
Genius 15689 points
Part Number: TLV7041-Q1
Other Parts Discussed in Thread: TLV7041

Hi Experts,

A customer is currently performing an FMEA on a design which includes several TLV7041-Q1 devices, for automotive qualification. Below is there query:

From the SNOAA54 document which details the failure mode and distribution information I notice that block diagram in figure 1 doesn't represent an open drain output, as the device is advertised to be.
I am therefore sceptical about the failure modes listed later in Table 3, as it lists 'OUT saturate high' as a potential failure mode.

Please could you confirm whether this is indeed an expected failure mode of this device, and the mechanism for how this may occur.

Regards,
Archie A.

  • +1
    TI__Guru 53846 points

    Hello ArTzy,

    Thank you for bringing this to our attention.

    Most likely the numbers came from a Push-Pull device.

    Discussing it with the author, we will most likely revise the table to the following:

    OUT Open (HiZ): 30%

    OUT Saturate high: 0%

    OUT Saturate low: 35%

    OUT not in spec: 30%

    Short between pins: 5%

    For the TLV7041, out high is 0% since the output can go up to 7V regardless of supply, which means that it does not have a ESD diode between the output and V+, so that eliminates that failure path. There is nothing else that would be able to pull the output up to V+ except a gross die failure due to EOS (which is not covered by the spec).