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LEVEL TRANSLATION

eli
Guru 13485 points
Other Parts Discussed in Thread: SN74LVC8T245, LSF0108, SN74ABT126, SN74LVC2T45, SN74LVC1T45

looking for  translator that translate from 5v to 3.3V  and opposite that comply to TTL-5V?

If so can it work in 50MHz clock?

Is LVCC4245A is the right solution?

  • 0
    TI__Guru* 96591 points
    Hi eli,
    We have many devices that can down-translate from 5V to 3.3V or up-translate from 3.3V to 5V. Can you tell me more about the application so I can suggest a part?

    How many channels are there?

    Is each channel unidirectional (signal always goes the same direction), directional controlled (signal changes directions with a direction signal), or auto-bidirectional (signal changes directions randomly with no direction signal)?

    What type of driver is on each side of the device (open-drain or push-pull)? How much current can the driver source/sink?

    What is the capacitive loading on each port (approximate values are fine -- 5pF, 15pF, 50pF, etc)?
  • 0 in reply to Emrys Maier
    Guru 13485 points
    Hi
    Need to check,but should be 8 bit,,directional control or auto-bidirectional.
    Need to be 50M
  • 0 in reply to eli
    TI__Guru* 96591 points
    Direction controlled is going to be far better signal quality, so I would recommend going that way if at all possible.

    The SN74LVC8T245 will work very well if it is direction controlled.

    If it autobidirectional, then we are essentially left with LSF0108. This device requires a strong driver (~10mA sink current on each side) and low capacitance (~15pF on the 5V side) to operate at 50 MHz. I would recommend watching the video series we have on the LSF if you plan to use it: training.ti.com/LogicMinute
  • 0 in reply to Emrys Maier
    Guru 13485 points

    Will the SN74LVC8T245RHL, SN74ABT126PWR, work at 50MHz

  • 0 in reply to eli
    TI__Guru* 96591 points
    Both of those devices will work at 50 MHz, however the SN74LVC8T245 is the clear choice (which I already stated above) because the SN74ABT126 requires up to 30mA of Icc, ~2000 times more current than the LVC device due to it's bi-CMOS architecture.
  • 0 in reply to Emrys Maier
    Guru 13485 points
    Thanks
    How I can know the typ speed it can work?
  • 0 in reply to eli
    TI__Guru* 96591 points
    Hi eli,
    We typically use a device in the same family to compare against. In this case, the SN74LVC1T45 and SN74LVC2T45 are built on the same technology. I would expect the SN74LVC8T45 to be slightly reduced due to the number of channels, but not by much. The device should easily be able to work at 360 Mbps (180 MHz).