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Original question:

[FAQ] What are the differences between PCA and TCA I2C switches?

PCA9306: PCA9306 vs TCA9416

Will Wang47
Expert 7670 points
Other Parts Discussed in Thread: TCA9416, PCA9306

Tool/software:

Hi  team,

Customer is working to design a 1.8V <--> 3.3V I2C level shifter circuit.

They used to use PCA9306, while when I review their circuit, I suggest them goes to TCA9416 based on the our comment understanding than TCA devices are better and more recommend as following link described.

https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1304261/faq-what-are-the-differences-between-pca-and-tca-i2c-switches?tisearch=e2e-sitesearch&keymatch=PCA%2520vs%2520TCA#

While customer feedback they find the TCA9416 has much larger delay spec as following shows, than PCA9306.

TCA9416:

PCA9306:

Could you help check what cause the TCA9416 get much higher delay? Any more recommendation part for PCA9306?

Regards,

Will

  • 0
    TI__Mastermind 40006 points

    Hi Will,

    TCA9416 introduces the rise time accelerators in addition to the shared passFET architecture of both devices mentioned here. As a result, the propagation delay is increased marginally. However I do not see this as a concern as I2C signals are not that fast in nature, so the difference is OK. 

    The PCA9306 having a small tpd is because the device is simply a FET that opens and closes to form connection between input/output, hence there is very little delay period between the two ports. 

    Is there a particular problem that they are attempting to address?

    Regards,

    Jack