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SN74AUP2G80: IC that converts momentary push button switch to maintain switch

Daniel Tsimerman
Prodigy 20 points
Part Number: SN74AUP2G80
Other Parts Discussed in Thread: SN74LVC2G14, SN74LVC1G74

We originally were going to use this IC: www.mouser.ca/.../STM6600DA55DM6F , in order to convert a momentary push button switch to maintain switch.

However, we're using 2 batteries at 1.2V each (2.4V total). The device works with 1.6V (minimum), but it does not enable the output to power up the system if the voltage input is less than 2.5V when button is pressed.
Can you offer a TI product that would achieve the same thing but that's under the 2.4V? We are also looking for something around the same price (or lower) as the other product (roughly $0.50 in 10,000 quantities).

Let me know if TI offers something like this. I just put that TI part number but not sure if that would work.

  • 0
    TI__Guru* 96712 points
    Hi Daniel,
    There's no single logic device that can replace your PMIC, however I could recommend a few devices that would likely be lower cost than the PMIC (total). I have a partial design somewhere on my computer -- I will look into it when I get back to work tomorrow morning and post what I have.
  • 0 in reply to Emrys Maier
    Prodigy 20 points
    Thank you. Looking forward to receiving it. Just for your info, this is the tact (momentary) switch we are planning on using: www.mouser.ca/.../SKTDLDE010

    Not sure if that changes anything but just wanted you to have it. And please keep in mind - we have very very little room to fit the components on the PCB as it's quite small so please consider that as well when suggesting which devices would work best to convert this to a maintain/latch push button.
  • 0 in reply to Daniel Tsimerman
    TI__Guru* 96712 points

    Hey Daniel,

    Thanks for the details.

    I think this is the simplest version I know of to achieve what you're after:

    This circuit will require 5 passive components and 2 IC's.

    For the 2 Schmitt-trigger inverters, I would recommend the SN74LVC2G14 in the DCK package (SN74LVC2G14DCKR). There are smaller packages available, but the DCK is quite small and is very popular, thus is largely available.

    For the flip-flop, I would recommend the SN74LVC1G74 in the DCU package (for similar reasons).  SN74LVC1G74DCUR

    Based on the digikey prices today and considering passives are generally very cheap, I think this will hit your price target without any issues.