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SN74CBTLV3257: About SN74CBTLV3257 input/output level

Vera Mao
Expert 5065 points
Part Number: SN74CBTLV3257


hi dear supporting team,

for SN74CBTLV3257, there is Vih/Vil/Voh/Vol parameter in the d/s, so is this an analog or digital multiplexer?  if it is provided 3.3V power supply, and input and output chips using 1.8V logic, will it ok?  for an example, if input is 1.8V, will the output be 1.8V or 3.3V ?  TKS!

  • 0
    TI__Prodigy 280 points

    Hi Vera,

    There is no Voh or Vol spec for this signal switch.  VCC is responsible for powering the control logic and gate voltage of the internal FET switches.  When the switches are passing a signal, you have a small voltage loss from Rdson, but essentially the output will be the same as the input. Your 1.8V logic chips should be fine and input of 1.8V will be 1.8V.