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TCA9617A / about datasheet revision history

Toshiyuki
Mastermind 7075 points
Other Parts Discussed in Thread: TCA9617A, TCA9517, TCA9617B, TCA9517A

Hi,

Customer has a quesiton about TCA9617A datasheet.

They are using TCA9617A as P2P device to PCA9617A[NXP].

However, "Powered-OFF High-Impedance I2C Pins" comment was deleted from Features list.

Please let us know the reason comment is deleted and what the value of resistance is for I2C pins.

Best Regards,

Kato

  • 0
    TI__Mastermind 30260 points

    Kato,

    TCA9617A does not support "Powered-Off High Impedance" because there is an ESD structure from all I2C pins to VCCB. There was a PCN issued for this datasheet change as well.

    Does the customer need 1MHz speed? If the customer only needs 400kHz speed, the TCA9517 will work as a p2p replacement also and is functionally equivalent to NXP's PCA9517A.

    If the customer needs the "Powered-Off High Impedance" and 1MHz speed, they will need to wait until TI releases the TCA9617B which is currently being developed to add in the "Powered-Off High Impedance" feature. We cannot comment on schedules on the forums, though.

    Please follow-up with the local TI sales team if you need TCA9617B scheduling info, and they will contact me directly via e-mail.

  • 0 in reply to Brian Berner
    Mastermind 7075 points

    Hi Brian - san,

    Thank you for the reply. I understood there is an ESD structure from all I2C pins to VCCB for TCA9617A.

    In that case, should VI/O at Absolute Maximum Ratings be changed from 7V(MAX) to VCC+0.3V(MAX) ?

     

    Besides TCA9617A, does I2C logic devices have the same issue ?

    Best Regards,

    Kato

  • 0 in reply to Toshiyuki
    TI__Mastermind 30260 points

    Kato,

    The Absolute Maximum Ratings are where the applied voltage/current could potentially cause damage to the device. 

    Therefore, the VI/O max of 7 V is still accurate.

    VIH of SCLA, SDAA, SCLB, and SDAB in Electrical Characteristics have max value of VCCB:

    The TCA9617A is the only device with an ESD structure from SCL, SDA to VCCB. The reason was to ensure the ESD doesn't turn on due to very fast edge rates that may occur with a 1 MHz clock.

    The TCA9517A supports the "Powered-off High Impedance" feature due to a difference in ESD architecture, and will work up to 400 kHz clock frequency.