Datasheet

245
7728G–AVR–06/10
ATtiny87/ATtiny167
22.3 Speed Grades
Figure 22-1. Maximum Frequency vs. Vcc, ATtiny87/167
22.4 Clock Characteristics
22.4.1 Calibrated Internal RC Oscillator Accuracy
22.4.2 External Clock Drive Waveforms
Figure 22-2. External Clock Drive Waveforms
Safe Operating Area
4.5V2.7V 5.5V
8 MHz
16 MHz
Frequency
Voltage
Table 22-1. Calibration and Accuracy of Internal RC Oscillator
Frequency Vcc Temperature Accuracy
Factory
Calibration
8.0 MHz 3V 25°C ±2%
Maximum
Deviation
8.0 MHz
2.7V –40°C/+125°C ±10%
5.5V –40°C/+125°C ±10%
V
IL1
V
IH1