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Original question:

SN74LV1T125: SN74LV1T125, Vcc = 0V, Vin = 5V, What is the input current?

SN74LV1T125: Vcc = 0V, OE = 1.8 V, 2 V at the output, will the output sink current?

Thomas Peter
Prodigy 80 points
Part Number: SN74LV1T125
Other Parts Discussed in Thread: SN74AXC1T45

Dear TI

I have a follow up question to my question in this post. 

Consider the following situation: Vcc is 0 V, the output-enable OE is at logic high (1.8 V) and the line connected to the output Y is at 2 V. 

Will the output then be at high-impedance and sink no current or does the OE feature not work if Vcc is 0 V and the output will sink some current? If yes, how many μA may this be?

The background is:
We are trying to minimize the current used by the SN74LV1T125 if the device is not in use but there is a voltage of 2 V at the output. Would it be best to keep the supply voltage at 3.3 V and pull OE to high?

Thank you and best regards

Thomas

  • 0
    TI__Guru 56100 points
    Thomas,

    Understood.
    I would suggest to have the Vcc powered up and pull the OE high to ensure hi-Z.
    During high-Z, the output can have more than Vcc voltage level. The electrical spec usually gives the Ioz current(very close to the input leakage current), but I don't see this in the datasheet.
    You could also consider using the SN74AXC1T45 for 1.8 to 3.3V conversion and this supports Ioff partial power down mode.
    I would suggest to have followup questions in the same thread.