Datasheet

1096
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
Figure 46-2. Main Oscillator Schematics
Note: A 1K resistor must be added on XOUT pin for crystals with frequencies lower than 8 MHz.
46.5.1 Crystal Oscillator Characteristics
The following characteristics are applicable to the operating temperature range: T
A
= -40°C to 85°C and worst case of power sup-
ply, unless otherwise specified.
46.5.2 XIN Clock Characteristics
Note: 1. These characteristics apply only when the Main Oscillator is in bypass mode (i.e., when MOSCEN = 0 and OSCBY-
PASS = 1) in the CKGR_MOR. See “PMC Clock Generator Main Oscillator Register” in the PMC section.
1K
XIN XOUT
GNDPLL
C
LEXT
C
LEXT
C
CRYSTAL
Table 46-8. Crystal Characteristics
Symbol Parameter Conditions Min Typ Max Unit
ESR Equivalent Series Resistor Rs
@ 16 MHz
@ 12 MHz C
CRYSTAL
Max
@ 12 MHz C
CRYSTAL
Min
80
90
110
Ω
C
M
Motional Capacitance 5 9 fF
C
S
Shunt Capacitance 7pF
Table 46-9. XIN Clock Electrical Characteristics
Symbol Parameter Conditions Min Max Unit
1/(t
CPXIN
) XIN Clock Frequency 50 MHz
t
CPXIN
XIN Clock Period 20 ns
t
CHXIN
XIN Clock High Half-period 0.4 × t
CPXIN
0.6 × t
CPXIN
ns
t
CLXIN
XIN Clock Low Half-period 0.4 × t
CPXIN
0.6 × t
CPXIN
ns
C
IN
XIN Input Capacitance
(1)
25 pF
R
IN
XIN Pulldown Resistor
(1)
500 kΩ
V
IN
XIN Voltage
(1)
V
DDOSC
V
DDOSC
V