>Thus a simple inexpensive single chip divider such as 74HC4017 Johnson
>counter may be used for oscillator frequencies of up to 20MHz or so.

As a slight aside, Google gave me a page with an excellent 
description of Johnson counters:

        http://www.vias.org/feee/shiftreg_07.html


which also had a link to a datasheet on the Texas website:

        http://www-s.ti.com/sc/ds/cd74hc4017.pdf


Peter

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