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SN74ALVCH16244 - Default output at input Hi-Z

Kawai
Guru 19785 points
Other Parts Discussed in Thread: SN74ALVCH16244

Hi Team,

Could you please tell us what the output logic is for SN74ALVCH16244 when input is Hi-Z from power up ?

I could not understand reading the datasheet and the below application note.

http://www.ti.com/lit/an/scla015/scla015.pdf

Best Regards,

Kawai

  • 0
    TI__Guru* 97046 points

    Kawai,

    The inputs to the ALVCH16244 have bus-hold circuitry which acts as a weak latch.  In the situation you describe, the input voltage is unknown on startup, so the part might latch high and it might latch low.  Without a known voltage on the inputs, there is no way to tell which one you will get until a valid voltage is put onto the inputs.

  • 0 in reply to Emrys Maier
    Guru 19785 points
    Hello Emrys-san,

    Thanks you for your prompt response.
    I understood that the output would be High or Low level (never Hi-Z) when input logic is not fixed (OPEN / Hi-Z).

    Best Regards,
    Kawai