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SN74LV4051A: Support Mixed-Mode Voltage Operation on All Ports

Hirotaka Matsumoto
Guru 27575 points
Part Number: SN74LV4051A
Other Parts Discussed in Thread: SN74CB3T3253

Hi all

Would you mind if we ask SN74LV4051A?

What is "Support Mixed-Mode Voltage Operation on All Ports" used for?
It is not tolerance function, right?
Our customer would like to use following conditions.
(We guess that our customer misunderstands "Support Mixed-Mode Voltage Operation on All Ports".)

<Condition>
-Y0～7 : 5.0V level
-COM : 3.3V level
Vcc : 3.3V
->Recommended Input or output voltage is upto Vcc(in this case 3.3V).
   So, it will be over Absoulute Maximum, that's why this is NG.
Is our recognition correct?


Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Mastermind 45370 points

    Matsumoto-san,

    It looks like your customer has found an error in out datasheet.   The SN74LV4051A only Support Mixed-Mode Voltage Operation on the control inputs not the I/O path.

    You are correct operating the SN74LV4051A with Vcc = 3.3 V and 5V on the signal path will violate the recommended operating conditions in the datasheet with Vi/o max = Vcc. 

    To meet the customer's requirements below:

    -Y0～7 : 5.0V level
    -COM : 3.3V level
    Vcc : 3.3V

    I would look at the SN74CB3TXXXX devices like 2x SN74CB3T3253.  This family of devices can be used in level shifting applications as seen in appnote "CBT-C, CB3T, and CB3Q Signal-Switch Families."

    We have logged a note in our datasheet error backlog to change "Support Mixed-Mode Voltage Operation on all ports" to  "Support Mixed-Mode Voltage Operation on the control inputs."

    Thank you,

    Adam