Atmel SAM9X25, Manual

Page: 1096 / 1145

1096
11054A–ATARM–27-Jul-11
SAM9X25
1096
11054A–ATARM–27-Jul-11
SAM9X25
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 supply, 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 OSCBYPASS = 1)
in the CKGR_MOR register. See “PMC Clock Generator Main Oscillator Register” in the PMC section.
1K
XIN XOUT
GNDPLL
C
LEXT
C
LEXT
C
CRY S TAL
Table 46-8. Crystal Characteristics
Symbol Parameter Conditions Min Typ Max Unit
ESR Equivalent Series Resistor Rs @16 MHz 80
Ω
C
M
Motional Capacitance 5 9 fF
C
S
Shunt Capacitance 7 pF
Table 46-9. XIN Clock Electrical Characteristics
Symbol Parameter Conditions Min Max Units
1/(t
CPXIN
) XIN Clock Frequency 50 MHz
t
CPXIN
XIN Clock Period 20 ns
t
CHXIN
XIN Clock High Half-period 0.4 x t
CPXIN
0.6 x t
CPXIN
ns
t
CLXIN
XIN Clock Low Half-period 0.4 x t
CPXIN
0.6 x t
CPXIN
ns
C
IN
XIN Input Capacitance
(1)
25 pF
R
IN
XIN Pulldown Resistor
(1)
500 k
Ω
V
IN
XIN Voltage
(1)
VDDOSC VDDOSC V