> I thought also of using a baby PIC, but somehow the fact that it's
> a clocked micro running program code seems somehow less
> bulletproof than a purely logic based solution.  Not sure if this
> concern is truly valid though

No reason a micro shouldn't be as reliable a solution as a dedicated
IC. There are pros and cons for either option (cost, simplicity, s/w,
availability etc)

My access to a single ADM705 would cost $20 (inc tax, courier)
whereas I have plenty of suitable PICs. That obviously need s/w,
so there's some time to spend on that

Other options I see at RS are

DS1811R-10, MAX812, MAX824

A fair number at Digikey too, and also at Microchip (which you can
free sample)

http://www.microchip.com/ParamChartSearch/chart.aspx?branchID=9008&mid=11&la
ng=en&pageId=79

Analog & Interface Products / CPU & System Supervisers

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