Louis:

There are multiple families of a type of IC known as a Power-On reset IC, 
or supervisory reset IC

They wait for a Voltage to appear above a threshold, and remain stable for 
some period, then send a reset output for a predetermined time.

If you go to the On Semi site, and search on "Power On Reset", you will get 
hits about ten different ICs.
Check out the MAX809 as an example

TI has a selector page, see
http://www.ti.com/power-management/supervisor-reset-ic/overview.html

If you go to the On Semi site, and search on "Power On Reset", you will get 
hits about ten different ICs.
Check out the MAX809 as an example

They are generally cheap and small, and many require no support or glue 
parts other than a bypass cap, if their default Voltages and times work for 
you.

--- Graham,


>

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