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AT90PWM2 Datasheet(PDF) 311 Page - ATMEL Corporation

Part # AT90PWM2
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
PDF  365 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90PWM2 Datasheet(HTML) 311 Page - ATMEL Corporation

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311
AT90PWM2/3
4317B–AVR–02/05
External Clock Drive Characteristics
Figure 147. External Clock Drive Waveforms
Maximum Speed vs. V
CC
Maximum frequency is depending on V
CC. As shown in Figure 148 , the Maximum Fre-
quency vs. V
CC curve is linear between x.xV < VCC < 4.5V. To calculate the maximum
frequency at a given voltage in this interval, use this equation:
At 3 Volt, this gives:
Thus, when V
CC = 3V, maximum frequency will be 14 MHz.
To calculate required voltage for a maximum frequency, use this equation::
Table 133. External Clock Drive
Symbol
Parameter
VCC = 2.7 - 5.5V
VCC = 4.5 - 5.5V
Units
Min.
Max.
Min.
Max.
1/tCLCL
Oscillator Frequency
0
TBD
0
TBD
MHz
tCLCL
Clock Period
TBD
TBD
ns
tCHCX
High Time
TBD
TBD
ns
tCLCX
Low Time
TBD
TBD
ns
tCLCH
Rise Time
TBD
TBD
µs
tCHCL
Fall Time
TBD
TBD
µs
∆t
CLCL
Change in period from one clock
cycle to the next
22
%
VIL1
VIH1
Frequency
V
0,9
–
()
0,15
----------------------
=
Frequency
30,9
–
()
0,15
----------------------
14
==
Voltage
0,9
0,15
f
•
+
=



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