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TPS7A4501-SP: SHDN ON to OFF threshold

Itai Eden
Intellectual 280 points
Part Number: TPS7A4501-SP
Other Parts Discussed in Thread: SN54AC00-SP, SN54AC02-SP, SN54AC14-SP

Hi,

I'm designing with the TPS7A4501-SP and wish to be able to turn the device output ON & OFF,

Now, the datasheet states a the the minimum ON to OFF threshold is 0.15V (Typical is 0.75V). 

I looked at options to deliver the SHDN signal from an FPGA, digital logic and transistor open collector circuits and non of them can guaranty a maximum V_Low<0.15V. the best I could do was 0.3V.

Can you recommend on a driver circuit that will provide such low voltage levels?

Regards,

Itai

  • 0
    TI__Mastermind 22155 points

    Hey Itai,

    I see that the TPS7A4501-SP has a shutdown current of 20 uA max. With this in mind I have found the following space devices.

    SN54AC00-SP (RHA 100kRad NAND Gate)

    SN54AC02-SP (RAD-TOL 50kRad NOR Gate)

    SN54AC14-SP (RAD-TOL 50kRad Schmitt-Trigger)

    These are all logic gates that can supply a 0.1V VOL signal at 50 uA.

    The NAND/NOR gate would have to have one of the inputs tied.

    Also they all would invert the signal of the FPGA, but that should simply be a coding fix.

    Thanks,

    Daniel

  • 0 in reply to Daniel Hartung
    Intellectual 280 points
    Thank you!
    I will be using a schmitt-trigger then