HTC555 and HTC550

[wjgregg]

These two custom IC's were marketed by High Tech Chips, whose website still comes up, but appears abandoned. The HTC555 was (is?) a selectable frequency version of a 555 timer, while the HTC550 is a selectable pulse width monostable multivibrator. Neither chip required a Cext or Rext. I have no particular need for these IC's, but I was curious to try them out. Does anyone know if these are still available?

 

[Richard Principal]

oh yes very good

**broken link removed**


abandoned? **broken link removed**

 

[Richard Principal]

oh yes very good
https://www.hightechips.com/Download/htc555.pdf


abandoned?
**broken link removed**

 

[wjgregg]

I checked again. Their e-mail address comes back "undeliverable". Their security certificate gets an "invalid", and their member login and order forms are stuck in a processing loop. Let me know if you can get through to them.

 

[hysteresis]

Some time ago, High Tech Chips released the source code for their products under a GPL (General Public Licence). Please see: **broken link removed**

So, if you have a programmer or PIC development system that's compatible with PIC12C508 micro-controllers, you can make your own HTC550 and HTC555 IC's.

NB if the source codes are not available for download from the present High Tech Chips web site, then I can provide copies.

 

[jpanhalt]

NB if the source codes are not available for download from the present High Tech Chips web site, then I can provide copies.

Hi, I went to that site and cannot find where to download the Assembly code. The programs of most interest to me are the 550, 555, 750, and 852. Any clues on where to find them? If not, I would be interested in getting them from you. Please PM me. John

 

[hysteresis]

... Please PM me. John

Hi John, you have a PM.

 

[hysteresis]

Hi, I went to that site and cannot find where to download the Assembly code...

The source codes appear to have been removed from the original site, but are available from here:
http://microproject.sourceforge.net