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SN74LVC125A: current support

VISHAL KALWANI
Intellectual 705 points
Part Number: SN74LVC125A

Hi,

I want to know does this IC support 20mA current load at 3.3v and 10mA load at 2.5v.

  • 0
    Guru 316940 points

    The recommended operating conditions allow 24 mA at 3.3 V and 8 mA at 2.5 V.

    The absolute maximum ratings allow 50 mA, so if you try to draw 10 mA at 2.5 V, the chip will not be damaged. However, the voltage drop can exceed the VOL/VOH specifications. It might be a better idea to use two outputs in parallel.

  • 0 in reply to Clemens Ladisch
    Intellectual 705 points

    Hi i am getting undershoot and overshoot with load and without load.

    i have used DS90LV048ATMTCX with converts Lvds to Cmos and then cmos apply to SN74LVC125APW.

    i have connect 49.9E at output of DS90LV048ATMTCX and then apply to SN74LVC125APW. I am not getting undershoot and overshoot at input of SN74LVC125APW but getting undershoot and overshoot at output of SN74LVC125APW.

    I have attached the schematic and all waveform are measured with spring.The waveform attached with load of 180mA with 180E resistor load. which kind of load can i connect to the circuit can you please let me know. the wave form are attached after removing 22e series resistor at SN74LVC125APW output.

    The first waveform measured at input of SN74LVC125APW and vcc is 3.3V & frequency 100Mhz.

  • 0 in reply to VISHAL KALWANI
    Guru 316940 points

    How long are the traces connected to the outputs? Is there anything else that can introduce a capacitive load?

    Do series resistors (22 Ω or higher) help?

  • 0 in reply to Clemens Ladisch
    Intellectual 705 points

    In datasheet specified of undershoot and ground bounce. Does this ic will not give the output without undershoot or overshoot.

  • 0 in reply to Clemens Ladisch
    Intellectual 705 points

    In datasheet specified of undershoot and ground bounce. Does this ic will not give the output without undershoot or overshoot.

  • 0 in reply to VISHAL KALWANI
    Guru 316940 points

    The low output voltage is always below 0.8 V, and the high output voltage is always above 2 V, so this matches the datasheet specifications.

    Overshoots and ringing are caused by capacitive load and reflections. Usually, a series resistor to match the line impedance helps.