one-chip power on / timed power off solution?

I am trying to find (or find if one exists) a (hopefully) one-chip
solution to control power in a simple circuit (a voltage regulator, two
hex inverters and some LEDs, to monitor 12 logic lines). Basically,
I'd like to be able to turn power on and off with a switch, but have
the power turn off after a set period of time (to save the battery -
it's going to be used in an environment where people will likely forget
to turn it off). Tried searching for an IC, but this either doesn't
exist, or I haven't searched very well. I know I can implement this
with something like a timer IC (e.g. 555) and some external components,
but it seems like the kind of thing for which there might already be a
special-purpose IC. As far as timing-out, I am thinking around 10
minutes.

Thanks in advance.

 

[Hal Murray]

In article <1165608248.783107.47950@73g2000cwn.googlegroups.com>,
knxnst@yahoo.com writes:

I am trying to find (or find if one exists) a (hopefully) one-chip
solution to control power in a simple circuit (a voltage regulator, two
hex inverters and some LEDs, to monitor 12 logic lines). Basically,
I'd like to be able to turn power on and off with a switch, but have
the power turn off after a set period of time (to save the battery -
it's going to be used in an environment where people will likely forget
to turn it off). Tried searching for an IC, but this either doesn't
exist, or I haven't searched very well. I know I can implement this
with something like a timer IC (e.g. 555) and some external components,
but it seems like the kind of thing for which there might already be a
special-purpose IC. As far as timing-out, I am thinking around 10
minutes.

How about your favorite small uP?

Last time I had a timing problem, I used a PIC. 8 pin DIP and
no external Rs/Cs.

--
These are my opinions, not necessarily my employer's. I hate spam.