Yes, most I²C Slave devices can be operated on an I3C Bus, as long as they have a 50 ns glitch filter and do not attempt to stall the clock. Such use will not degrade the speed of communications to I3C Slaves; it will require decreased speed only when communicating with the I²C Slaves.

I3C Slave Devices with a Static Address can operate as I2C Slaves on an I2C bus; optionally, they can also have a 50 ns spike filter.

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