8-bit AVR Microcontroller

External Clock Drive

Figure 1. External Clock Drive Waveform
Table 1. External Clock Drive Characteristics
Symbol Parameter VCC = 1.8 - 5.5V VCC = 2.7 - 5.5V VCC = 4.5 - 5.5V Units
Min. Max. Min. Max. Min. Max.
1/tCLCL Clock Frequency 0 4 0 8 0 12 MHz
tCLCL Clock Period 250   125   83   ns
tCHCX High Time 100   50   33   ns
tCLCX Low Time 100   50   33   ns
tCLCH Rise Time   2.0   1   0.6 μs
tCHCL Fall Time   2.0   1   0.6 μs
ΔtCLCL Change in period from one clock cycle to the next   2   2   2 %