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| AT91SAM9261S_14 Datasheet, PDF (647/709 Pages) ATMEL Corporation – Incorporates the ARM926EJ-S ARM Thumb Processor | |||
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AT91SAM9261S
39.5.3 Main Oscillator Characteristics
Table 39-10. Main Oscillator Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
1/(tCPMAIN)
CCRYSTAL
Crystal Oscillator Frequency
Crystal Load Capacitance
CLEXT(7)
External Load Capacitance
Duty Cycle
CCRYSTAL = 12.5 pF(6)
CCRYSTAL = 15 pF(6)
CCRYSTAL = 17.5 pF(6)
3
16
20
12.5
15
17.5
15
18
22
40
50
60
VDDPLL = 3 to 3.6V
CS = 3 pF(1) 1/(tCPMAIN) = 3 MHz
20
tST
Startup Time
CS = 7 pF(1) 1/(tCPMAIN) = 8 MHz
4
CS = 7 pF(1) 1/(tCPMAIN) = 16 MHz
2
CS = 7 pF(1) 1/(tCPMAIN) = 20 MHz
2
IDDST
Standby Current Consumption Standby mode
1
@ 3 MHz
15
@ 8 MHz
30
PON
Drive Level
@ 16 MHz
50
IDD ON
Current Dissipation
@ 20 MHz
@ 3 MHz(2)
@ 8 MHz(3)
@ 16 MHz(4)
@ 20 MHz(5)
50
150
250
300
530
300
530
450
650
Notes:
1. CS is the shunt capacitance.
2. RS = 100 to 200 Ω ; CS = 2.0 to 2.5 pF; CM = 2 to 1.5 fF (typ, worst case) using 1 kΩ serial resistor on XOUT.
3. RS = 50 to 100 Ω ; CS = 2.0 to 2.5 pF; CM = 4 to 3 fF (typ, worst case).
4. RS = 25 to 50 Ω ; CS = 2.5 to 3.0 pF; CM = 7 to 5 fF (typ, worst case).
5. RS = 20 to 50 Ω ; CS = 3.2 to 4.0 pF; CM = 10 to 8 fF (typ, worst case).
6. Additional user load capacitance should be subtracted from CLEXT.
7. CLEXT is determined by taking into account internal parasitic and package load capacitance.
AT91SAM9261S
Unit
MHz
pF
pF
%
ms
µA
µW
µA
XIN
XOUT
CLEXT
CCRYSTAL
CLEXT
6242EâATARMâ11-Sep09
647
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