You could make up a small microcontroller that has onboard flash and suitable firmware to produce the desired function. It is unlikely that you will find a ready made LSI chip to perform the function you desire.

You may also be able to design a program for a field programmable gate array that woulf perform the desired function.

Very few specialized custom chips are manufactured anymore except for the extremely high volume applications. The reason for this is that there are just too many specialized applications. For this reason the world has turned to microcontrollers with embedded software or the use of FPGAs.

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By the way Mr Alex Provad.....You sent me an email on this project as pertained to your last forum thread on this same subject. I replied to you with a long email that took quite some time to prepare. Did you get that email? The favor of a return reply is requested. If you did not get it then email me again.

Michael Karas