Datasheet
87
XMEGA B3 [DATASHEET]
8074D–AVR–08/2013
Note: 1. Numbers for negative impedance are not tested but guaranteed from design and characterization.
36.14.8 External 32.768kHz crystal oscillator and TOSC characteristics
Table 36-28. External 32.768kHz crystal oscillator and TOSC characteristics.
Note: 1. See Figure 36-4 on page 87 for definition
Figure 36-4. TOSC input capacitance
The input capacitance between the TOSC pins is C
L1
+ C
L2
in series as seen from the crystal when oscillating without
external capacitors.
C
XTAL1
Parasitic capacitance 5.9
pF
C
XTAL2
Parasitic capacitance 8.3
C
LOAD
Parasitic capacitance load 3.5
Symbol Parameter Condition Min Typ Max Units
ESR/R1
Recommended crystal equivalent
series resistance (ESR)
Crystal load capacitance 6.5pF 60
kCrystal load capacitance 9.0pF 35
Crystal load capacitance 12.0pF 28
C
IN_TOSC
Input capacitance between TOSC pins
Normal mode 3.5
pF
Low power mode 3.5
Recommended Safety factor
capacitance load matched to
crystal specification
3
Long term Jitter (SIT) 0 %
Symbol Parameter Condition Min. Typ. Max. Units
C
L1
C
L2
2CS
O
T
1
CS
O
T
Device internal
External