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TXB0304: 3.3V always there but 1.8V off and OE off, any issue?

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Poh Kok Keng

Replies: 8

Views: 139

Part Number: TXB0304

hi,

For the circuit below,

Please help check with TI to see our application circuit is fine to use. We will shutdown the LDO_1V8 and only left 3.3V powered to TXB0304 without enable the OE of TXB0304 when in sleep mode, do you see an issue? Supply from primary battery and B1 to B4 are SPI signals.

During our test, we noticed TXB0304 still functional but only 3.3V port got high leakage current. Any suggestion?

Best Regards,

Felix

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Dylan Hubbard
- Feb 19, 2021 2:16 PM
Hey Felix,

This device has Ioff which disables the I/O when one of the supplies is 0 V. Do you have a pull-down on the OE pin?

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Poh Kok Keng
- Feb 20, 2021 3:22 AM
In reply to Dylan Hubbard:

hi Dylan,

Yes, pull down is in place on OE pin.

Best Regards,
Felix
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Wee Giap Toh1
- Feb 22, 2021 3:38 AM
In reply to Dylan Hubbard:

Hi Dylan,

We have a state that VCCB and OE pin will be disable and left VCCA powered alone during the sleep mode.

We do faced an issue of the high leakage current on VCCA pin and have almost 5% failures of this level shifter

What I can think off probably cause by ESD (production handling) or voltage transient when primary battery insertion.

Anything else will cause VCCA high leakage current when VCCB and OE disable with the proper stated.

Appreciate if you could advise.

Thanks,

Regards,

twg
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Dylan Hubbard
- Feb 22, 2021 3:57 PM
In reply to Wee Giap Toh1:

Hi Felix, twg,

Base any the small failure rate, its possible its due to damage. There is nothing wrong with the circuit that I can see. I would start a FA which would allow us to determine if that's the case.

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Wee Giap Toh1
- Feb 23, 2021 12:47 AM
In reply to Dylan Hubbard:

Hi Dylan,

We have asked our CM (OSI) sent in the failure IC to TI for FA.

Please let us know the result soon.

Thanks,

Regards,

twg
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Wee Giap Toh1
- Feb 23, 2021 5:46 AM
In reply to Dylan Hubbard:

Hi Dylan,

Could you help provide us the mean time failure data (MTBF) for this level shifter?

If not, who can share with us of this data?

Appreciate if you could advise.

Thanks,

Regards,

twg
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Dylan Hubbard
- Feb 23, 2021 6:01 AM
In reply to Wee Giap Toh1:

Hi twg,

You can find that information by typing the part number at this link.

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Poh Kok Keng
- Feb 23, 2021 6:01 AM
In reply to Wee Giap Toh1:

hi Wee Giap,

MTBF information can get from: https://www.ti.com/quality/docs/estimator.tsp

best regards,

Felix
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