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CD74HC7046A: CD74HC7046A

Abhishekh M L
Prodigy 170 points
Part Number: CD74HC7046A
Other Parts Discussed in Thread: CD74HC4049,

Hi Experts,

We are using a "Phase-Locked Loop with VCO and Lock Detector " whose part number is "CD74HC7046AM"

I am unable to find ibis models for simulation.

Could you please help me find the ibis models for the device / similar device / alternate equivalent device?

Thank you in advance.

With Regards,

Abhishekh M L

  • 0
    TI__Guru* 96711 points
    Hi Abhishekh,
    Since IBIS models only simulate signal integrity and not functionality, you can use any IBIS model from the CD74HC family of devices.

    I just looked through a few dozen and didn't find one available. I can do a more comprehensive search when I return to work tomorrow (today is a holiday).
  • 0 in reply to Emrys Maier
    Prodigy 170 points

    Hi Emrys Maier,

    Thanks for the information.

    Awaiting from you for further inputs once you come to office.

    With Regards,

    Abhishekh M L

  • 0 in reply to Abhishekh M L
    TI__Guru* 96711 points

    Hi Abishekh,

    The closest model I could find is this: CD74HC4049

    What aspect of the CD74HC7046A are you trying to simulate?  The HC4049 uses the same technology and output structure as the HC7046, so it should have very similar output characteristics, but only if you're looking at the push-pull outputs of the device.  If, for example, you're looking at PC2, this output also has a high-impedance state that wouldn't be characterized in this model (although, it's independent of the device since it's a Hi-Z output).

    Typically with these older devices, prototypes are a better source of information than simulation.

    cd74hc4049.ibs

  • 0 in reply to Emrys Maier
    Prodigy 170 points

    Hi,

    While simulation I am receiving more undershoot at this device.

    Can anyone let me know what is the overshoot & undershoot specification for the device.

    I was unable to find the details in datasheet.

    Thank you,

  • 0 in reply to Abhishekh M L
    TI__Guru* 96711 points
    Hi Abhishekh,
    We don't specify overshoot/undershoot, since those are characteristics of a second order system external to the device. This will depend on your loading, and typically gets worse with lighter/capacitive loads, and can be reduced using series output resistance or added load capacitance.