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Original question:

PCA9518: Alternative to NXP PCA9518A?

PCA9518: Does the PCA9518 support clock stretching?

Boby Joseph
Prodigy 70 points
Part Number: PCA9518
Other Parts Discussed in Thread: TXS0101,

Hi TI team,

We are using the PCA9518 with TI translator (TXS0101, 3.3V to 1.8V) to access the PCIe switch through Micro-controller in our board and PCIe switch needs clock stretching support. When PCIe switch does clock stretching, then a glitch happens on I2C bus with TI I2C expander which causes the wrong access to PCIe switch. if we use the PCA9518A from NXP, then we do not see any glitches and no errors on I2C bus.

As per latest PCA9518 datasheet, PCA9518 does not support clock stretching and having issues with high rise accelerators.

Does TI have any plan to fix this errata for the PCA9518?

Does TI have an footprint compatible part (with PCA9518) that does not have this errata?

Regards,
Amit Mittal

  • 0
    TI__Guru 72751 points
    Hey Amit,

    "Does TI have any plan to fix this errata for the PCA9518?"
    There is currently NO plans to create a replacement device.

    "Does TI have an footprint compatible part (with PCA9518) that does not have this errata?"
    Unfortunately, we do not because this device has its own unique footprint/function.

    -Bobby