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CD4050B: High to Low translator : CD4050B for 15 V to 3.3 V Translation

Varunesh Kumar
Intellectual 980 points
Part Number: CD4050B
Other Parts Discussed in Thread: UCC27524A

Hello 

I wish to have a Hi to Lo translation for multiple inputs.

From 15 V to 3.3 V for my DSP.

Can I use this CD4050B wuth Vdd of 3.3 V ?

Any precautions or any limitations?

Thanks in advance

Best

Varun

  • 0
    TI__Mastermind 42145 points

    Hi Varun,

    Yes, you can use this for down translation. 

  • 0 in reply to Albert Xu1
    Intellectual 980 points

    Hi Albert

    I am looking for an Up translation, not Down, please.

    I wanted to know the Voltage sequencing to avoid the 

    Power up glitch.

    To recap. CD4504, Inputs as 3.3 V Signals from MCU.

    Vcc as 5V, Vdd as 15V, Select Pin to Vcc that is TTL to CMOS.

    Normal functioning is alright, only there is a glitch at Power up.

    My 5 V is established first, followed approx 4-5 mS later by 15V.

    The 3.3V is synchronous with the 5V 

    There is an O/P glitch of approx 2-4 V for 5 to 6 mSec

    Please advise the correct PS sequencing to avoid the power-up glitch

    Thanks in advance

    Best regards

    Varun 

  • 0 in reply to Varunesh Kumar
    TI__Mastermind 42145 points

    Hi Varun,

    Can you send over a schematic or block diagram of what you are trying to achieve? 

    I am a bit confused on what you are referring to as VDD.

  • 0 in reply to Albert Xu1
    Intellectual 980 points

    Hi Albert

    The Vcc ( Pin No 1 ) is powered by 5V, the Vdd ( Pin No 16 )

    is powered by 15V, the Select Pin, No 13 is to 5V,

    for making it TTL to CMOS compatible/ ( ViH as 2V )

    The Inputs are fed from the MCU, which operates at 3.3V.

    The objective is to translate the 3.3V Signals Up to 15V.

    Normal functioning is alright, except for a Power-up Glitch.

    The 5V is established first, followed by 15 V.

    Hope that clarifies.

    Best

    Varun

  • 0 in reply to Varunesh Kumar
    TI__Mastermind 42145 points

    Hi Varun,

    You have listed the CD4050B, however, Pin 16 and 13 are NC on this device. 

    Please double check and confirm what device you are referring to. 

  • +1 in reply to Albert Xu1
    Intellectual 980 points

    Hi Albert

    There are two questions, one Hi to Lo using CD4050 (15 to 3.3V ) and another one Lo to Hi using CD4504 (3.3V to 15V).

    Both got mixed in the same thread.

    Hi to Lo is already answered, Thank you.

    Lo to Hi was generating a Power u glitch with CD4504.

    Not sure if the IC was genuine TI Part, TI Stores is stock out.

    To play safe have changed CD4504 to 3 Nos of UCC27524A.

    So , not pursuing either thread and have closed the thread.

    Thank you for your continuing support and a very Happy & Merry Christmas.

    Thanks again.

    Varun