Mostek MK5017 clock chip for SB-634

Alan 'A.J.' Franzman a.j.franzman at VERIZON.NET
Wed May 24 18:00:08 EDT 2006

---- Original Message ----
From: "Alan 'A.J.' Franzman" <a.j.franzman at>
To: "Heathkit Owners and Collectors List" <HEATH at LISTSERV.TEMPE.GOV>
Sent: Wednesday, May 24, 2006 2:48 PM
Subject: Re: Mostek MK5017 clock chip for SB-634

> Which MK5017 IC, exactly, does the SB-634 need?  The MK5017 is actually
> several different clock chips which have different suffixes that are
> significant, determined by the specific function set of the chip.  For
> example, MK5017AA has an alarm tone output, MK5017AN has clock radio
> functions (alarm and sleep timer switched outputs), MK5017BA has a
> calendar, etc.  There may also be a "P" somewhere in the suffix if it's a
> ceramic-packaged chip.  I believe I have an untested MK5017BA somewhere, if
> I can find it.

Small correction - the calendar version is MK5017BB, not BA.

Also, I found mine, an MK 5017BB P (white ceramic with gold pins and die cover


Alan "A.J." Franzman

Email: a.j.franzman [ A T ]  verizon [ D O T ] net


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