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TS5A3167: like know more details parameters of INC(PWROFF) and ICOM(PWROFF) at datasheet

Bo Mi
Prodigy 10 points
Part Number: TS5A3167
Other Parts Discussed in Thread: TMUX1511, SN74CB3Q3125, , TS5A23166, TMUX1574, TMUX1575

Hi There,

I am thinking use this part to isolate the signals between two power domain, battery (3.0V) and VCC-3.3V, the VCC may be powered off in some case and without isolation the battery will be consumed more leakage current through ESD diodes at VCC domain. Simple block diagram is as below.

the leakage current on powering off listed at datasheet is with condition of VNC and VCOM up to 3.6V, see capture below, do you have the leakage data on condition of 0 - 3.0V at VNC and 0V at VCOM for example.

another question is which pin of NC or COM is better to connect to battery domain signals?

the TMUX1511 is a better fit to me, but it's non stock on market. do you have other parts suggestion for my application?

Thanks

Bo 

  • 0
    TI__Mastermind 26513 points

    Hey Bo,

    The SN74CB3Q3125 would be a good 4 channel 1:1 switch with powered off protection that can be used in place for the TMUX1511. Low Ron and low Coon with powered off protection up to 5.5V. I'm not sure what is meant by VCC - 3.3V but I'm understanding this as VCC = 3.3V and there will be condition in which VCC = 0V. The leakage when Vcc = 0 is specified across the entire range. So when the datasheet states 0 to 3.6V, the conditions for 0 to 3.3V would be encompassed here. 
    Which side you connect shouldn't matter. 
    As mentioned, SN74CB3Q3125 would be a good device to use, but I want to add a note that in the PW package it is a P2P drop-in replacement of the TMUX1511. This would allow you to design with the SN74CB3Q3125 in the meantime, but allow you to keep an eye out for TMUX1511 as we are constantly replenishing the inventory on ti.com.

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Prodigy 10 points

    Thanks Rami,

    the SN74CB3Q3125 is not so good to replace TMUX1511 on my application, I care much about leakage current on powering off as the cell battery has very small capacity and VCC power may be off for months, the TMUX1511's Ipoff has only 10 nA when Vs is at 0-3V, see capture below, the SN74CB3Q3125 is 1uA, the other advantage of TMUX1511 its smaller UQFN package, I also care the package size as my application has very limited space.

    the YMUX1511 datasheet list the Ipoff at two conditions, 10nA at Vc=0-3V and 2uA at Vc=0-3.6V, I want to know if you have the leakage current data for TS5A3167 or SN74CB3Q3125 on the condition of Vnc=0-3V or Vo=0-3V instead of Vnc=0-3.6V or Vo=0-5.5V? 

    Do you have one channel part which is similar to TMUX1511?

    Thanks

    Bo

  • 0 in reply to Bo Mi
    TI__Mastermind 26513 points

    Hey Bo,

    We don't have that information on hand for the TS5A or the 3Q3125. There also isn't a 1:1 smaller channel that would match this spec level. The TS5A23166 comes close in a 2 channel device but the leakage spec is in the hundreds of nA's. 

    I think your best bet, due to the supply constraint, may actually be the TMUX1574 which is a 4 channel 2:1 device. You wouldn't have control over the individual channels though. This device relies on bank switching where all switches are connected to either SxA or SxB based on 1 select pin. Or you can turn them all off with the /EN. You could simply hold the state by tying the Sel pin low (which can be done by leaving the pin floating since it has integrated pull down resistors) and tie the SxA path the system and ground the SxB path. Then control the connection with the /EN pin. 
    The TMUX1574 also comes in 16pin UQFN (both are 2.6x1.8mm) so it will be the same size as the TMUX1511, plus it is spec'ed exaactly the same as the TMUX1511.
    This from the TMUX1574 datasheet: 



    Let me know if this will work

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Prodigy 10 points

    TMUX1574 you suggested is a good replacement to TMUX1511, but I couldn't find stock on major distributors, how about TMUX1575 which has stock, is it the same parts but with inverted OE?

    Thanks

    Bo

  • +1 in reply to Bo Mi
    TI__Mastermind 26513 points

    The TMUX1575 is a great option too. It's an even smaller package (WCSP) and from a performance stand point, the same part. It also support 1.2V logic. Expect it to have the same leakage, although it isn't explicitly stated as it is in the TMUX1574, for the 0-3V input. 

    Thanks,
    Rami