Freescale Semiconductor MC9S12ZVM series, Reference Manual

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Appendix B CPMU Electrical Specifications (VREG, OSC, IRC, PLL)
MC9S12ZVM Family Reference Manual Rev. 1.3
Freescale Semiconductor 759
B.2 IRC and OSC Electrical Specifications
Table B-2. IRC electrical characteristics
Table B-3. OSC electrical characteristics (Junction Temperature From –40
°
C To +175
°
C)
B.3 Phase Locked Loop
B.3.1 Jitter Information
With each transition of the feedback clock, the deviation from the reference clock is measured and the
input voltage to the VCO is adjusted accordingly.The adjustment is done continuously with no abrupt
changes in the VCOCLK frequency. Noise, voltage, temperature and other factors cause slight variations
in the control loop resulting in a clock jitter. This jitter affects the real minimum and maximum clock
periods as illustrated in
Figure B-1. .
Num C Rating Symbol Min Typ Max Unit
1a P Junction Temperature - 40 to 150 Celsius
Internal Reference Frequency, factory trimmed f
IRC1M_TRIM
0.9895 1 1.0145 MHz
1b M Junction Temperature 150 to 175 Celsius
(1)
Internal Reference Frequency, factory trimmed
1. Full characterization not complete
f
IRC1M_TRIM
0.9855 1 1.0145 MHz
Num C Rating Symbol Min Typ Max Unit
1 C Nominal crystal or resonator frequency f
OSC
4.0 — 20 MHz
2 M Startup Current i
OSC
100 — —
µ
A
3a C Oscillator start-up time (4MHz)
(1)
1. These values apply for carefully designed PCB layouts with capacitors that match the crystal/resonator requirements.
t
UPOSC
— 2 10 ms
3b C Oscillator start-up time (8MHz)
1
t
UPOSC
— 1.6 8 ms
3c C Oscillator start-up time (16MHz)
1
t
UPOSC
— 1 5 ms
3d C Oscillator start-up time (20MHz)
1
t
UPOSC
— 1 4 ms
4 M Clock Monitor Failure Assert Frequency f
CMFA
200 450 1200 KHz
5 D Input Capacitance (EXTAL, XTAL pins) C
IN
— 7 — pF
6 C EXTAL Pin Input Hysteresis V
HYS,EXTAL
— 120 — mV
7 C EXTAL Pin oscillation amplitude (loop controlled
Pierce) V
PP,EXTAL
— 1.0 — V
8 D EXTAL Pin oscillation required amplitude
(2)
2. Needs to be measured at room temperature on the application board using a probe with very low (<=5pF) input capacitance.
V
PP,EXTAL
0.8 — 1.5 V