maximum frequency obtainable with 555 timer
**broken link removed**
3 MHz astable frequency capability
Wow, that's an improvement. The datasheet is dated october 2003. Now I come to think about it the last time I used a 555 in a non-trivial project was about fifteen years ago...
The Timing Shift with Temperature is a lot better as well.
It now depends on your definition of "precise".
You may need to use a good timing capacitor such as a silver mica type rarther than
a ceramic. If you are really cunning you could try to get the temperature coefficients
of the LMC555, the resistors and the timing capacitor to cancel out to some extent.