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CD40106B: Use an open collector to trigger 12V inputs to 5V outputs

Christophe TANNEAU
Prodigy 30 points
Part Number: CD40106B
Other Parts Discussed in Thread: CD4504B,

Hello,

I'd like to create a simple circuit to convert logical signals that could be 0-5V or 0-12V to a simple 0-5V output.

Could you recommend a logical circuit with open collector, or open drain, to achieve that conversion, with an output tied up to a 5V through a pull up resistor.

I have a lot of inputs, so I try to simplify the circuit. Can be inverting or not.

Thanks

Christophe

  • 0
    TI__Mastermind 24985 points
    Hello Christophe,

    The most appropriate device specifically for this application would be the CD4504b. www.ti.com/.../cd4504b.
    You need to apply the voltages to the VDD and VCC appropriately to get the input tolerance and output voltage level that you require.

    It is also possible that you could use the CD40106B with a 5V supply, but when the inputs are 12V they will clamp to the 5V rail, so you would need to put a 10k resistor on the input to limit the current into the device. This comes with the drawback that you are consuming more current. Additionally, if you are using a fast data rate, however, then another drawback would be the slow input edge rate caused by the input RC that we are creating by adding a series resistance.

    I hope this helps. Please let me know if you have additional questions.

    Best,
    Michael