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Voltage Level Translation Forum
TXS0108E or TXB0108 better for sdio
I'm searching for an level translater vor a sdio application. On the one side i have 3.3V and on the other side i have 1.8V. By now, it's not clear to me, which of the two named translators is the better choice? the host processor has maximum data rate of 25Mbps, so i think the TXS0108E is the better one, right? I use the DM355 Davinci Processor and the LS Research Tiwi module.
Thanks for answer and help.
The TXS0108E is used for open-drain architecture, whereas the TXB0108 is used for push-pull architecture. The TXS0108E can be used for push-pull architecture, but its maximum data rate throughput in push-pull is 60Mbps and in open-drain is 2Mbps, whereas the TXB0108's max data throughput is 100Mbps.
In my personal experience, I have seen SDIO interfaces start the synchronization phase in open-drain to allow for very accurate and robust syncing, and then for data transfer the bus switches to push-pull to allow for higher data rate transfer speeds.
We have a product, the TXS0206, that is specifically made with this in mind. Is this more of something you are looking for?
thanks for your answer.
The TXS0206 seems to be the best choice. My test hardware is solderd by my own and i have no designed board, so i could only use packeages which i can solder by myself. For this reason, i think the TXS0108E is the right choice.
In the second stage i will use the TXS0206.
Good luck on the design! Please post on the forum if any questions arise.
I tried to use the TXB0108 on an SDIO interface and it does not work. There is a problem with the CMD line, the CMD line goes into open drain mode during initialization. If the CMD line was previously driven low by the host or device on the SDIO bus then the TXB0108 holds the line low and it not float high as needed. I will try TSX0108E, hopefully this solves the problem !
For TXS0108, please to be careful for the CLK signal translation, I think for Data and CMD, it should be no problem. But for CLK signal, please check what the frequency you will work and also check the Vih and Vil for the TXS0108.
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