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SN74AVC4T245: SN74AVC4T245 Operation when power is supplied to VCCA from the state where it is not supplied.

Masahito Takei
Intellectual 270 points
Part Number: SN74AVC4T245

Please tell me about the operation when the power is turned on from the state where the VCCA is not turned on.

When 0V is applied to OE and VCCA, +3.3V is applied to VCCB, and +3.3V is applied to VI of B port, does the VO side of A port become high impedance and become IOFF?


When VCCA is raised to +1.8V from the previous state, won't VO of A port be higher than +1.8V?

  • +1
    TI__Mastermind 21975 points

    Hi Masahito-San,

    Masahito Takei said:
    When 0V is applied to OE and VCCA, +3.3V is applied to VCCB, and +3.3V is applied to VI of B port, does the VO side of A port become high impedance and become IOFF?

    Yes, as the Ioff spec guarantees high impedance for the I/O ports when any of the supplies are 0V.

    Masahito Takei said:
    When VCCA is raised to +1.8V from the previous state, won't VO of A port be higher than +1.8V?

    If I am following correctly, the B side is configured as an input with 3.3V and the A side as an output for 1.8V. Hence, VO of A would be 1.8V as the A ports are designed to track VCCA, thanks.

    Best Regards,

    Michael.