+3.3V Parallel ATA Signalling?

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  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia

    #1

    +3.3V Parallel ATA Signalling?

    I have found PVR units with chipsets requiring +3.3V signalling, such as the Fujitsu SmartMPEG MB68H25A, but some like the ST STi5518 are apparently +5V I/O tolerant.

    In a PVR with the ST STi5518 chipset has buffers with +5V-level outputs to the the chipset and the hard drive.
    Another PVR; this time with a Fujitsu MB68H25A which has buffers with +3.3V-level outputs to the chipset and the hard drive.

    So I am wondering about +3.3V parallel ATA signalling, and what ATA standard(s) made +3.3V signalling optional and/or mandatory.
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30991
    • Albion

    #2
    Re: +3.3V Parallel ATA Signalling?

    there are 8 ata white papers so-far.

    given that the logic is active-low and you can get away with 100k pullup resistors, i suspect the current at 5v would be too low to do damage.
    also,
    a quick look at most hd pcb's shows a whole aray of inline resistors behind the connector - probably as safety parts to limit current on the pins.

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