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Urgent: Need replacement for SN75451BD but in LVTTL and LVCMOS

Marko S
Intellectual 670 points
Other Parts Discussed in Thread: ULN2003LV

Is there a similar circuit like the SN75451BD but in LVTTL or LVCMOS? I need to have it run on 3.3V supply voltage.

I would hope to find one so I don't have to add a +5V to my design.

  • 0
    TI__Guru**** 166106 points

    Marko,

    What type of load will the device drive?
    max Voltage, max Current , Inductive or resistive

    Is there a speed/ timing requirement?

    How many channels do you need?
    Does it need to be an AND function (more solutions are available in invert function).

  • 0 in reply to Ron Michallick
    Intellectual 670 points

    Hello again

    I have come to the conclusion that the +5V supply is OK. I don't need to use +3.3V. I can choose any of them.

    But I did notice that the  SN75451BD doesn't have the temperature range i need (-40degC to +70degC). Så i must select another circuit. The SN55451BD does work ok in that temperature range but is too expensive.

    For my design I need to switch a current through a transmitter LED. The current is about 30-60mA. I't would be nice to find a 5 gate inverter with open collector output. With 5 och 3.3V supply.

    And it would be nice to have the same dalay time (18ns).

    The SN75451BD is used in the following example for the transmitter LED:

  • 0 in reply to Marko S
    Intellectual 670 points

    I need 5 channels.

  • 0 in reply to Marko S
    TI__Guru**** 166106 points

    Marko,

    The ULN2003LV would be the lowest cost solution, but it may not be fast enough.

    You could try using analog switches with one side of the switch connected to ground.
    I attached a list of SPST switches that have an on/off time less than 18nS.

    parameter-data.xls