Under what conditions was the ICC vs. Frequency diagram sampled? The data sheet states that it is based on of 16-bit up/down counters in each function block and that there is no output loading. What about VCC and temperature?
VCC is nominal (5.0V for 5V parts, 3.3V for 9500XL and XPLA3 parts, 2.5V for XV parts).
Temperature is room temperature.