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TMUX1219: Maximum input voltage condition

Sameer Arora
Prodigy 150 points
Part Number: TMUX1219

comparing the 2 Parts TI, TMUX1219DBVR and Pericomm PI5A124.

They are extremely similar but have only one flaw in the supply voltage range and maximum on the input signals to the mux

 

In particular:

 

PERICOM       Max VDD 7V              MAX INPUT 9V            OPERATING VDD 2V to 6V              Operation:-40°C - 85°C

 

TEXAS            Max VDD 6V              MAX INPUT 6,5V            OPERATING VDD 1.08V to 6V         Operation: -40°C - 125°C

 

Since Texas is not identical or always improving (Texas for example it works at a higher temperature and also at 1.8V, Pericom no but at high voltages the Pericom is more robust) it seems risky to homologate them together as much as they are similar.

Could you advise on the above.

  • 0
    TI__Mastermind 46447 points

    Hi Sameer,

    There are a couple reasons to treat them as similar parts. 

    First, there is a large overlap in absolute maximum conditions as well as operating Vdd's for the part. For applications that have a VDD between 2V and 6V, with a signal range that is between 0 and 6.5V, both parts can be used, and the TI part has advantages for higher temperature applications.

    Second, the largest discrepancy is the larger input signal range on Pericom's  PI5A124. A current limiting resistor can be applied to the terminals that will be overvolted, as long as max current spec's are adhered to, there isn't an issue. This being said, this won't be appropriate for every application due to the increase insertion loss at the load due to the current limiting resistor.

    So the parts are similar and have a lot of applications in which both can perform. However, they are not an exact "perfect" match and there will be some scenario's where the one of the parts can be utilized, while the other one cannot be. 

    Best Regards,

    Parker Dodson