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PCA9548A i2c bus voltage support for 2.5V VDD

Question asked by Ramasamy Kanamangalam Venkatachalapathy on Aug 23, 2019
Latest reply on Aug 27, 2019 by G.w. Sun



For 8 channel I2C mux we would like to know if we could connect VDD to 2.5V and connect one of the downstream to 1.8V?


Configuration we are planning to use.


  1. Upstream I2C bus-3.3V
  2. 3 Downstream channels- 1.8V
  3. 5 Downstream channels- 3.3V


From the AN262-2 Figure 7, it is not clear if 2.5V VDD can support 1.8V I2C bus