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TS3DDR3812: TS3DDR3812RUAR MUX Switching time between the ports

Harsh Mistry1
Prodigy 20 points
Part Number: TS3DDR3812
Other Parts Discussed in Thread: TS3DDR4000,
Hello Experts,
Considering the two parts TS3DDR3812 & TS3DDR4000 for multiplexing,
in our application we have to switch back and forth between the two ports B and C.
Lets say Port B would be interfaced with Octal Flash and Port C would be interfaced with Octal RAM.
I came across the information from datasheets tPZH, tPZL in TS3DDR3812 and tSWITCH in TS3DDR4000
but I am not sure if that is what I am looking for.
So I would like to know how fast can these parts be used for switching between channel B and C or vice versa?
Your prompt response will be highly appreciated.

Regards,

  • 0
    TI__Guru 52462 points

    Hello Harsh Mistry1, 

    For the TS3DDR3812 tPZH  and tPZL represent "Enable Time" from the select input. This along with the tPLZ and tPHZ will give you a switching speed. It is better explained in the datasheet on page 7, attached below for clarity.

    For the TS3DDR4000, tswitch is the transition time that you are looking looking for.

    The reason for the difference in the part specification is that some of our older parts such as the TS3DDR3812 used different terms when referring transition times of the switch. They are the same thing however.

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    TI__Guru 52462 points

    The picture didn't show up correctly on my last post:

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    Prodigy 20 points

    Thank you for the response.

    Can I assume that the max value for the switching time would be 7ns from the moment we toggle the Select line?

    Parker Dodson said:
    For the TS3DDR3812 tPZH  and tPZL represent "Enable Time" from the select input. This along with the tPLZ and tPHZ will give you a switching speed. It is better explained in the datasheet on page 7, attached below for clarity.

  • 0 in reply to Harsh Mistry1
    TI__Guru 52462 points

    Hello Harsh Mistry1,

    Yes you are correct, as long as the conditions for the test remain the same. For this test the VDD is at 3.3V +/- 300mV, with a RL of 200 Ohms, and a CL of 4pF. A larger CL will increase the max switching time. 

    Best Regards,

    Parker Dodson