[sdiy] 8253 modern replacement?

Ullrich Peter Peter.Ullrich at kapsch.net
Fri May 8 18:20:35 CEST 2015


I would start from this project:

http://www.technoblogy.com/show?QVN

________________________________________
Von: synth-diy-bounces at dropmix.xs4all.nl [synth-diy-bounces at dropmix.xs4all.nl]" im Auftrag von "Jack Jackson [jackdamery at hotmail.co.uk]
Gesendet: Freitag, 08. Mai 2015 18:13
An: Sdiy
Betreff: Re: [sdiy] 8253 modern replacement?

Hmmm, thanks for all the suggestions. I'm wondering if the ATtiny85 arduino (8 pin DIP, 2 x PWM output) could be put to work. It's about the same cost. Maybe feed it the frequency it needs to hold as a byte over a serial line.

----------------------------------------
> From: Peter.Ullrich at kapsch.net
> To: modular at go2.pl; synth-diy at dropmix.xs4all.nl
> Date: Fri, 8 May 2015 13:53:29 +0000
> Subject: Re: [sdiy] 8253 modern replacement?
>
> Hi Roman!
>
> You can buy them cheaper at ebay - but buy more to save postage...
>
> http://www.ebay.com/itm/N82C54-Intel-8-MHz-Progammable-Interval-Timer-CHMOS-PLCC28-2-pieces-/261614618292?pt=LH_DefaultDomain_0&hash=item3ce97246b4
>
> http://www.ebay.com/itm/1x-OKI-M82C54-2-Microprocessor-Peripheral-PLCC-28-/171374687378?pt=LH_DefaultDomain_0&hash=item27e6ba3492
>
> Ciao
> Peter
>
> -----Ursprüngliche Nachricht-----
> Von: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von Roman Sowa
> Gesendet: Freitag, 08. Mai 2015 15:50
> An: synth-diy at dropmix.xs4all.nl
> Betreff: Re: [sdiy] 8253 modern replacement?
>
> That's another example of higher power syncing all our minds around the globe. I was thinking about exactly the same and started the design of programmable counter using generic logic parts: 4x74161 and 2x74595.
> The result was about 3x3.5cm PCB for one 16-bit counter. Definitely too big for me. So I turned back to the old counter chip and bought them in PLCC, which is so much smaller than my silly attempt.
> Yes, they are still made today by Intersil, but a bit pricey for such a simple device, about $8 for single 82c54, which is just slightly improved 8253.
>
> Roman
>
> W dniu 2015-05-08 o 15:12, Jack Jackson pisze:
>> The 8253 programmable interval timer IC was used a lot in the 80s for
>> generating frequencies for DCOs. Is there an easier way to do this in
>> modern times? Maybe a modern IC with a smaller footprint or something
>> else entirely?
>>
>> Best, Jack _______________________________________________ Synth-diy
>> mailing list Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
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