Is there any avalible graphed data showing typical curves?
Also is the following qualified? i.e. what is the accuracy below 2.7V?
"Conditions: Frequency values are typical values. 12 MHz 1.5 % accuracy is guaranteed for
2.7 V VDD 3.6 V. Variations between parts may cause the IRC to fall outside the 12 MHz
1.5 % accuracy specification for voltages below 2.7 V."