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TCA9555: latency

[FAE] Andrew Wang
Genius 10685 points
Part Number: TCA9555

Hi Team,

Customer wants to know if this device has internal latency spec? The time measures from I2C command received to actual output state change.

A typical number should be also fine.

Thanks!

Andrew

  • 0
    TI__Guru 73271 points

    Hey Andrew,

    Section 7.7 of the datasheet mentions a parameter abbreviated as tpv which states the maximum time from the 70% value of the 9th clock cycle of a write to when the port changes is dependent on Vcc. For Vcc between 2.3V to 5.5V the delay is about 200ns.(Note this is for a 100pF load on the output port).

    Essentially this means that you should see the ports output before the I2C line even sees a stop condition.

    Thanks,

    -Bobby