TXS0104E: TXS0104E status confirm

Derek Zhong

Part Number: TXS0104E

Dear TI,

Please help review the schematic below,suspend we want to transfer the signal from PCIE_RESET_N_3P3 to PCIE_RESET_N, and received by controller, when PCIE_RESET_N_3P3 is high, controller received high signal, when PCIE_RESET_N_3P3 is low, controller received low signal, but if we suspend PCIE_RESET_N_3P3, controller also received high signal, I think it's an abnormal status.

So could you give us some advice that when PCIE_RESET_N_3P3 suspend, controller can receive a low signal. (We have tried to use PullDown resistance, but it doesn't work.)

Thank you.

suspend

over 5 years ago

0 ShreyasRao over 5 years ago

TI__Guru 62140 points

Hi Derek,

We do not recommend using external pullup or pulldown signal on TXS/ TXB.

The TXS have internal 10k pullup resistors and hence the default IO status will be high to their respective Vcc sides. i.e A ports to Vcca and B ports to Vccb.

In order to have low, the OE pin has to be engaged/ asserted by which the IO ports are disconnected from the 10k pullups. With a very weak pulldown ( 100k), the IO ports will be low.

0 Derek Zhong over 5 years ago

Intellectual 470 points

Dear Shreyas,

Thanks for your reply.

So could you provide some advice for my application, I want to use the IC for normal level shift, and controller need receive a low signal when PCIE_RESET_N_3P3 suspend, Thank you.

Or could you provide a suitable IC for reference, Thank you.

0 Clemens Ladisch over 5 years ago in reply to Derek Zhong

Guru 316860 points

What exactly does "suspended" mean? Does the power supply on that side also go away? Is there a control signal that indicates this state?

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TXS0104E: TXS0104E status confirm