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Is the 555 still a viable IC?

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JPortici:

--- Quote from: SiliconWizard on February 18, 2024, 03:17:36 am ---
--- Quote from: baldurn on February 18, 2024, 02:39:56 am ---Funny that you say software development is the reason to avoid a MCU and use 555. These days most people think the other way around. We go with a MCU even when a 555 would have done the job. It is easier to figure out a simple program than it is to do "real" EE with discrete components.

--- End quote ---

Yes. That is, until people actually have to make stuff that is provably reliable - that's usually when they reconsider doing everything with software.
But for tinkering, it may look easier.

--- End quote ---

You don't have to prove to a committe that your independent software timer that resets everything in case of a failure actually works as intended :)
and it's another independent MCU you don't have to program

baldurn:
A new YouTube video about this exact topic: https://youtu.be/SgV6_Y_sg4k?si=hC28IX6KcHHjxwQU

He proposes using ATTiny 412 instead of 555.

jpanhalt:
Way back in 1999, High Tech Chips produced several Microchip 12F PIC-based devices that were pre-programmed to do 555 type stuff -- of course, VCC and GND were reversed.  I thought, there's a gold shovel without a handle.  The name is still found by Google, but its not clear whether they still produce those items.  I have included 2 pdf's of their datasheets from that time.

Google link: http://www.hightechips.com/   Yes, it is spelled differently.

Warhawk:

--- Quote from: baldurn on February 18, 2024, 04:30:43 pm ---A new YouTube video about this exact topic: https://youtu.be/SgV6_Y_sg4k?si=hC28IX6KcHHjxwQU

He proposes using ATTiny 412 instead of 555.

--- End quote ---

Maybe for hobby but not for production. Go and find the second source for ATTiny. Or just pre-programming ICs for production is pain.
I know about automotive projects using 555. It is not stupid as long as it does the job.

SeanB:
Yes as a relatively robust driver nothing to beat it, especially as you can get level shifting, from almost any voltage logic level above 3V, to 12v for almost free, just add in a single resistor or a zener diode, plus you get the ability to drive an indicator LED to show output low almost free as well, and it can also drive another load active low as well. 2 of them, and a single small signal transistor as inverter, and a few resistors, and you get a robust full bridge driver, and add in another small signal transistor and a pair of resistors and you also get the ability to turn the bridge off as well, using the reset inputs. Level shifting from logic to 15V included free as well, plus well defined switching thresholds for slow edges included as a bonus. Most of the non CMOS bipolar ones will do a half amp as well no problem, the CMOS at least 100mA which is a good drive for a lot of things. Just need a 1000uF 16V capacitor close by for power decoupling.

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