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TS3DDR4000: Max junction temperature

Jeff YANG
Mastermind 7825 points
Part Number: TS3DDR4000

Tool/software:

Hi,

Does there have maximum junction temperature spec?

Seem there have no mention in datasheet.

Thanks!

Jeff

  • +1
    TI__Mastermind 35218 points

    Hi Jeff, 

    We have an FAQ that has an excel at the bottom that will solve it for you:

    [FAQ] How to Calculate the Max Junction Temperature of an Analog Switch/Multiplexer.

    That being said, I did notice there is no mention of the max current this device can support in the datasheet. That value would be needed. The max I saw in a test condition was 10mA so I used that value and got 86.2C for the max junction temperature. There's no way that's the abs max since we wouldn't test RON at our abs max current. Typically for a device like this, it would be at least 30mA. For reference, the TS3DDR33812, it's DDR3 predecessor is rated up to 128mA. If we used that reference the Junction temp would be 289C. The safe bet here would be to use the max storage temperature of 150C since these devices are just analog switches and won't heat up much at all during their normal operation. Especially if this is being used in something like DDR and the input node is a high impedance input (very low current actually going through the mux)

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Mastermind 7825 points

    Hi Rami,

    Got it, thank you!

  • 0 in reply to Jeff YANG
    Mastermind 7825 points

    Hi Rami,

    Another quesiton, The specification mentions that this chip supports POD_12, SSTL_12, SSTL_15, and SSTL_18 signaling. Given the context at the time, these likely operated in CTT mode. Currently, newer NAND devices support LTT mode. Is this chip suitable for use with LTT mode? Or are there other better options available?

    Thanks!

    Jeff

  • 0 in reply to Jeff YANG
    TI__Mastermind 35218 points

    Hi Jeff,

    I'm not so familiar with LTT mode. The switch itself is just an analog switch. It behaves as a resistor with some capacitance so as long as the LTT mode signals don't violate the datasheet specs, it should be fine. So for this device, that would be =<3.3V on the I/O's & <6GHz.

    Do you happen to know what the signals would look like?

    Thanks,
    Rami