5.16 Crystal Oscillator, LFXT1, High-Frequency Mode
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER |
TEST CONDITIONS |
VCC |
MIN |
TYP |
MAX |
UNIT |
fLFXT1 |
LFXT1 oscillator crystal frequency |
Ceramic resonator |
1.8 V to 3.6 V |
0.45 |
|
8 |
MHz |
Crystal resonator |
1.8 V to 3.6 V |
1 |
|
8 |
CL,eff |
Integrated effective load capacitance, HF mode(1)(2) |
|
|
|
1 |
|
pF |
|
Duty cycle |
Measured at P1.5/ACLK |
2.2 V, 3 V |
40 |
50 |
60 |
% |
(1) Includes parasitic bond and package capacitance (approximately 2 pF per pin). Because the PCB adds additional capacitance, it is recommended to verify the correct load by measuring the ACLK frequency. For a correct setup the effective load capacitance should always match the specification of the used crystal.
(2) Requires external capacitors at both terminals. Values are specified by crystal manufacturers.