Hello all,

ADV7180 datasheet P.10 says below about characterizatoin of I2C port.

SCLK Frequency Max 400KHｚ

SCLK and SDA Rise Times Max 300ns

SCLK and SDA Fall Times Max 300ns

Question1

Does above clock frequency of Max 400Khz mean the value at I2C Fast-mode ?

Do we need to meet Max 400KHz at Standard mode ?

Question 2

Do we need to satisfy maximum rising time of 300ns when ADV7180 is used at Standard-mode ?

I2C specificatoin is Max 1000ns at Standard-mode.

Our customer uses 100Khz at Standard-mode and rising time is about 480ns.

For test, they ask us above.

Regards,

Q1) 400kHz is the maximum I2C speeds

Rise and fall times are the slowest it should go. Of course you will need faster rise times at 400kHz.

You can run the bus at a slower speed as long as the rise and fall times are shorter then the max times

Q2) Yes, the device should meet the rise and fall times of 300ns even in standard-mode. Not a problem since It's all based on the pull up resistor.

We often run the I2C 80-100kHz rates without problems. Of course we have a strong enough resistor to meet the 300ns rise time.