TXS0104E: Leakage current when device is partial power on

Adrian Liu

Part Number: TXS0104E

Hi Team,

If we only power VCCA or VCCB, will it have leakage current at the power down side? If it has, what's the approximate number?

If there is any problem even if only one VCC(A or B) is powered on for a long time, will it damage the device and affect its reliability?

I read the datasheet and your answer in another question, there is an Ioff in Partial Power Down mode, but it describe the current flow from the A1:A4 pins through to VCCA or the the current flow from the B1:B4 pins through to VCCB. How about the leakage from VCCA to B1:B4 pins and VCCB to A1:A4 pin?

https://e2e.ti.com/support/logic-group/logic/f/logic-forum/536311/txs0104e---how-can-i-tell-if-partial-power-down-mode-ioff-is-supported/

Best regard

Adrian

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 318050 points

There is no leakage between power and I/O pins, but with V_CCB powered down, there is leakage from V_CCA to V_CCB; see Biasing Requirements for TXS, TXB, and LSF Auto-Bidirectional Translators.

0 Adrian Liu over 2 years ago in reply to Clemens Ladisch

TI__Intellectual 2645 points

Hi Clemens,

Thanks for you quick reply.

So the leakage only happen when VCCA > VCCB, and the leakage will flow from VCCA to VCCB, won't through any I/O pins, right?

And there is no leakage when we only power down VCCA?

0 Adrian Liu over 2 years ago in reply to Adrian Liu

TI__Intellectual 2645 points

And I have one more question, if I set OE low, when VCCB is powered down, will there still be leakage current from VCCA to VCCB?

0 Clemens Ladisch over 2 years ago in reply to Adrian Liu

Guru 318050 points

All correct.

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TXS0104E: Leakage current when device is partial power on