[Libre-silicon-devel] Analog Try-out "triple-5"

ludwig jaffe ludwig.jaffe at gmail.com
Mon Mar 4 05:11:27 CET 2019

TAA761 and other historic classic chips in german

On Sun, Mar 3, 2019 at 11:10 PM ludwig jaffe <ludwig.jaffe at gmail.com> wrote:

> Hi Hagen,
> we could make a combo chip:
> NE555, some LM741, and some CD4066 (transfer gate)
> UC3845, UC3843 (simple PWM chip for switch mode power supply)
> So geeks could combine the chips using transfer gates :-)
> Or lets think about a simple analog geeky chip, that contains:
> saw tooth generator, comparator, rs latch, error-amps (UC3845)
> while the the saw tooth generator is replaced with a NE555 (transfer gate,
> or just fitting the ne 555 instead of the internal uc3845 saw tooth
> generator)
> The Op-Amp in the UC3845 may be replaced with a 741 or similar simple op
> amp.
> So we have an universal circuit containing:
> -OPAMPS (741, LM324 or similar)
> -universal SAWTOOTH-Generators (NE555)
> -RS-Latch (NE555 also has a latch) for use in fake UC3845
> -the rest used in UC3845
> the transfer gates are used as pin mux so we can access internal stuff
> of the modified UC3845 and split it into, OP-AMPS, NE555 and so on.
> So having a programable simple analog circuit would be cool.
> Also a TL431 programable z-diode woud be cool as well as
> TAA 761 open collector op-amp.
> So here we could combine TL431 with TAA761 open collector
> op amp.
> We would have an analog "fpga"
> What do you think?
> Cheers,
> Ludwig
> On Sun, Mar 3, 2019 at 2:13 PM Hagen SANKOWSKI <hsank at posteo.de> wrote:
>> Hello List.
>> Today in our weekly Mumble Session we talked about a smaller chip, which
>> could be realized before the Northpoint.
>> The Reason is mostly, that the Northpoint (as an small MCU) - beside the
>> Standard Cells - also has some challenging Analog Stuff (like the ADC,
>> Pad-Cells) which set the hurdle a little bit high.
>> We need some physical haptic fancy / shiny silicon before which gives us
>> also a realistic way to verify our simulation after model measurement we
>> do with PearlRiver. Something we could hand over to other people and
>> which blinks..
>> Well, we came across the well-known "triple-5 chip". The original NE555
>> [0] was developed by the Swiss electronics engineer Hans Camenzind [1]
>> and get cloned by nearly all silicon firms on the market in this era.
>> Great starting points for our CMOS-based clone are the wikipedia site
>> and the free eBook [2] of the original author. I strongly recommend
>> everybody to read this great book!
>> Mostly the 555 chips are in the -55 to +125 C temperature range - the
>> same we assume for our technology. And the voltage supply goes up to +18
>> Volt, I already saw 555 which worked with higher voltage. If we like, we
>> could using our BiCMOS feature for the output driver - driving the same
>> current with less power consumption.
>> The 555 chip has a legendary status between electronic engineers, radio
>> amateurs and tinkers. And some of them writing obeisance on hackaday.com
>> still in 2018 [3]. Many variations of the chip are still in production.
>> Short - the 555 would be a great try-out for LibreSilicon! And I am
>> proud to announce that Ferenc will be our Lead for the "LS 555"
>> (LibreSilicon triple-5). Thanks Ferenc for your commitment!
>> Regards,
>> Hagen.
>> [0] https://en.wikipedia.org/wiki/555_timer_IC
>> [1] https://en.wikipedia.org/wiki/Hans_Camenzind
>> [2] http://www.designinganalogchips.com/
>> [3] https://hackaday.com/2018/10/10/the-555-and-how-it-got-that-way/
>> _______________________________________________
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