6.3.2.2 Oscillator frequency specifications
Table 14. Oscillator frequency specifications, (VDD33OSC = VDD33OSC (min) to
VDD33OSC (max), TA = TL to TH)
Symbol
Description
Min.
Typ.
Max.
Unit
Notes
fosc_lo
Oscillator crystal or resonator frequency — low
frequency mode
32
—
40
kHz
fosc_hi_1
Oscillator crystal or resonator frequency — high
frequency mode (low range)
1
—
8
MHz
fosc_hi_2
Oscillator crystal or resonator frequency — high
frequency mode (high range)
8
—
32
MHz
tdc_extal
Input clock duty cycle (external clock mode)
40
50
60
%
tcst
Crystal start-up time — 32 kHz low-frequency,
low-power mode
—
TBD
—
ms
Crystal start-up time — 32 kHz low-frequency,
high-gain mode
—
800
—
ms
Crystal start-up time — 8 MHz high-frequency,
low-power mode
—
4
—
ms
Crystal start-up time — 8 MHz high-frequency,
high-gain mode
—
3
—
ms
1. This parameter is characterized before qualification rather than 100% tested.
2. Proper PC board layout procedures must be followed to achieve specifications.
3. Crystal start up time is defined as the time between the oscillator being enabled and the OSCINIT bit in the MCG_S
register being set.
6.3.3 32kHz Oscillator Electrical Characteristics
This section describes the module electrical characteristics.
6.3.3.1 32kHz Oscillator DC Electrical Specifications
Table 15. 32kHz Oscillator Module DC Electrical Specifications (VSSOSC= 0 VDC)
(TA = TL to TH)
Symbol
Description
Min.
Typ.
Max.
Unit
VBAT
Supply voltage
1.71
—
3.6
V
RF
Internal feedback resistor
—
100
—
MΩ
Cpara
Parasitical capacitance of EXTAL32 and XTAL32
—
2.5
—
pF
Cload
Internal load capacitance (programmable)
—
15
—
pF
Vpp
Peak-to-peak amplitude of oscillation
—
0.6
—
V
Peripheral operating requirements and behaviors
K40 Sub-Family Data Sheet Data Sheet, Rev. 1, 11/2010.
28
Preliminary
Freescale Semiconductor, Inc.
Preliminary