This excerpt taken from the LRCX DEF 14A filed Oct 10, 2006.
Termination of Employment. If an optionees employment terminates for any reason other than cause, death or disability, then options held by the optionee under the 2007 Stock Plan generally will be exercisable to the extent they are vested on the termination date for a period of 90 days (or such other period set by the
Administrator) after the termination but not after the expiration date. If an optionees employment terminates for cause, then all options held by the optionee under the 2007 Stock Plan terminate immediately upon the optionees termination. The Administrator has the authority to extend the period of time for which an award is to remain exercisable following an awardees termination (taking into account limitations and consequences under the Code) but not beyond the expiration of the term of the award and to permit an award to be exercised with respect to unvested shares at the time of awardees termination.