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SN74VMEH22501A-EP: CVMEH22501AIDGGREP

Part Number: SN74VMEH22501A-EP

Hello,

A customer fis asking about the state of the “B” bus of the  CVMEH22501AIDGGREP in order to guarantee isolation. Attached is the note that seems to indicate that the OEAB and OEBY(bar) need to be Low and High respectively in order for the respective output, A and Y to go into isolation, is that true or are these independently controlled? They don’t care about the Y iolation, but they do care for B to be in tri-state mode.

Best,

Arash

  • Hi,

    The applications engineer supporting this device returns to the office Monday at which time he will respond to your inquiries.

    Thanks.
  • Arash,
    The 1B and 2B ports will be isolated, high Z, when 1OEAB and 2OEAB are low.
    The 1Y and 2Y ports are controlled by nOEBY. Since you don't care, nOEBY signals can be tied high or low.
    These can be independently controlled, as can be seen in the logic block diagram.

    3B1 is controlled differently, and for it to be in tristate, the nOE signal needs to be H. See function table 2.

    From the email question. If the live insertion is not required, the BIAS VCC can be tied to normal VCC and sequencing is not required.

    If this answers your question, please click "Verify it as the answer"
    Regards,
    Wade