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Part Number: TS5A23157
My customer is looking for a dual MUX device to switch between 2x and 4x mode for SPI flash. This would require MUXing just two of the 4 data bits:
Would it be ok to mux/buffer only these two bits in 4x mode? Would the propogation delay of the MUX cause and issue with delay/skew of the SPI data?
Thank you for posting to E2E.
To avoid any complications with inconsistent delays, I would suggest sending all four lines through a mux. For SPI signals, my recommendation is to use TMUX1511, which is a 4-channel 1:1 device that features powered-off protection. Please see the functional diagram below:
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In reply to Kate Dickson:
Thanks for your quick response!
I don't think a 1:1 device would work here, since SPIO2 and SPIO3 need to be connected either to SPI_DATA2 and SPI_DATA3 or WP and HOLD, as indicatd in the diagram. With the 1:1 device above, it looks like you would only be able to disconnect the Data lines, not swap them with WP and HOLD.
Do you have an alternative suggestion?
In reply to Emma Yanakiev11:
Thanks for the clarification.
I recommend using TMUX1574, which is a 4-channel 2:1 device that supports SPI signals and features powered-off protection.
For this solution, you could connect SDIO0 and SDIO1 to both source terminals of their respective channels. See the functional diagram below:
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