Datasheet

303
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
5. Minimum V
CC
for Power-down is 2.5V.
6. The Analog Comparator Propagation Delay equals 1 comparator clock plus 30 nS. See “Analog Comparator” on page 227.
for comparator clock definition.
26.3 External Clock Drive Characteristics
26.3.1 Calibrated Internal RC Oscillator Accuracy
26.3.2 External Clock Drive Waveforms
Figure 26-1. External Clock Drive Waveforms
26.3.3 External Clock Drive
Table 26-1. Calibration Accuracy of Internal RC Oscillator
Frequency V
CC
Temperature Calibration Accuracy
Factory
Calibration
8.0 MHz 3V 25C±10%
User
Calibration
7.3 - 8.1 MHz 2.7V - 5.5V -40C - 85C±1%
V
IL1
V
IH1
Table 26-2. External Clock Drive
Symbol Parameter
V
CC
=2.7-5.5V V
CC
=4.5-5.5V
UnitsMin. Max. Min. Max.
1/t
CLCL
Oscillator Frequency 0 10 0 20 MHz
t
CLCL
Clock Period 100 50 ns
t
CHCX
High Time 40 20 ns
t
CLCX
Low Time 40 20 ns
t
CLCH
Rise Time 1.6 0.5 s
t
CHCL
Fall Time 1.6 0.5 s
t
CLCL
Change in period from one
clock cycle to the next
22%