TCA9548A: TCA9548A Operating Voltage

Jason Wu4

Prodigy 740 points

Part Number: TCA9548A

Hi team,

Does TCA9548A have any issue under below operating voltage?

Thanks!

Best,

Jason

over 4 years ago

0 Max Robertson over 4 years ago

TI__Guru 62910 points

Hi Jason,

It is OK to operate the device in this way with VCC = 3.3 V and VDPU = 5 V on the downstream buses.

If you have any further questions please just let us know.

Regards,
Max

0 Jason Wu4 over 4 years ago in reply to Max Robertson

TI__Prodigy 740 points

Hi team,

How about below condition?

Thanks!

Best,

Jason

0 Max Robertson over 4 years ago in reply to Jason Wu4

TI__Guru 62910 points

Hi Jason,

It would be better to operate at a lower VCC level. At VCC = 3.3 V, the "Vpass" voltage would be about 2 V (see Figure 14 in the datasheet). This means that any voltages lower than 2 V would be passed through the device. The master side's high level of 1.65 V is below this, and so the downstream channels would also have a high level of close to 1.65 V rather than the desired 5 V level.

Regards,
Max

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TCA9548A: TCA9548A Operating Voltage