SN74LVC1G175: Could you help to design a push button

user4979989

Part Number: SN74LVC1G175
Other Parts Discussed in Thread: TPS22810, SN74HCS72, SN74LVC2G17, SN74LVC1G74

Hi Sir,

My customer would like to design a button to enable/disable the power, the main purpose is to save the power consumption.

Short press to turn on - enable a load switch TPS22810 to connect the downstream power rails.

Short press to turn off - disable a load switch TPS22810 to disconnect the downstream power rails.

The input is a 12V DC jack.

We refer to the app note: SCEA048B (Push-Button Circuit), but the schematic is short press to turn on, long press to turn off.

My customer would like to have a short press to turn on and short press to turn off function.

Would you please help to come out a schematic for me?

Thank you!

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 243090 points

This makes the circuit simpler. See the Convert a Momentary Switch to a Toggle Switch video.

The SN74HCS72 has Schmitt-trigger inputs and does not need separate Schmitt-trigger buffers.

0 user4979989 over 3 years ago in reply to Clemens Ladisch

TI__Intellectual 2800 points

Hi Clemens,

Could you recommend single D-type version?

SN74HCS72 Schmitt-Trigger Input Dual D-Type Negative-Edge-Triggered Flip-Flops With Clear and Preset

Thank you.

0 Clemens Ladisch over 3 years ago in reply to user4979989

Guru 243090 points

There are single D-type flip-flops like the SN74LVC1G74, but those have plain CMOS inputs and need separate Schmitt-trigger buffers (e.g., SN74LVC2G17) as shown in the circuit above.

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SN74LVC1G175: Could you help to design a push button