This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TINA/Spice/SN74HC4851: SN74HC4851PWR simulation model

Part Number: SN74HC4851
Other Parts Discussed in Thread: TINA-TI, , MUX508, TMUX1072

Tool/software: TINA-TI or Spice Models

I used the multiplexer SN74HC4851PWR and the buffer 74HC125D, 652 for a design that I need to simulate. I already searched your web page in the "tools & software" section of these components but I did not find any SPICE or IBIS files that could be useful for this simulation. My question to you is, is there any way to simulate these components, especially the multiplexer?

  • Diego,

    What is the issue you would like to simulate?  We don't have many models for our passive FET switches like the SN74HC4851 but maybe we can help answer you questions on the switch behavior.

    You can also build a quick behavior model of the FET signal path using the parasitic resistances and capacitances in the datasheet.  

    Thank you,

    Adam

  • Hi Adam,

    Tanck you

    I need simulate

    1. Worst case analysis

    2. The maximum distortion and nois of the output signal with respect to the signal of the selected channel (insertity).
    3. IC behavior with very fast analog signals
    4. IC behavior with the maximum change in the channel selector (considering propagation times).

  • Diego,

    What do you think about using the newer MUX508 device that has an IBIS and Tina-TI spice model. This device also has better characterization of the device performance.

    Thank you,
    Adam
  • I see the datasheet of MUX508 but this device does not meet the requirements of the system you want to design

    Some of them are:

    1.Power Supply range (VDD) from 3V to 3.6V and low consuption

    2. Input range voltage from 0V to VDD whith clamp or over voltage proctection.

    3. Propagation delay + transition time << 1 ms

    4. Low distortion of analog signals (input-output)

    5. For automotive aplication (AEC) and preferably safety aplications (very low failure rate, specifiqued)

    If you have any subject, I would like to know

    Thank you and regards.

  • Diego,

    Based on the requirements above have you looked at the TMUX1072 that has overvoltage detection and protection? It meets all your requirements above except that the Q100 automotive qualification.

    What signals are you needing to switch? Would this be of interest?

    Adam
  • Diego,

    Do you have any further comments or questions on this thread?

    Thank you,
    Adam
  • Thank you very much Adam, yes I think good option.

    We do not rule out the implementation of a new part number to help us improve our design, but for the moment we want to SN74HC4851.

    No more to add I aprpreciate your support.