Datasheet

Electrical Characteristics
S12XS Family Reference Manual, Rev. 1.13
690 Freescale Semiconductor
A.6.2 Oscillator
Table A-23. Oscillator Characteristics
Conditions are shown in Table A-4. unless otherwise noted
Num C Rating Symbol Min Typ Max Unit
1a C Crystal oscillator range (loop controlled Pierce)
f
OSC
4.0 — 16 MHz
1b C
Crystal oscillator range (full swing Pierce)
1,2
1
Depending on the crystal a damping series resistor might be necessary
2
Only valid if full swing Pierce oscillator/external clock mode is selected
f
OSC
2.0 — 40 MHz
2 P Startup Current
i
OSC
100 — — µA
3a C
Oscillator start-up time (LCP, 4MHz)
3
3
These values apply for carefully designed PCB layouts with capacitors that match the crystal/resonator requirements..
t
UPOSC
— 2.2 10 ms
3b C
Oscillator start-up time (LCP, 8MHz)
3
t
UPOSC
— 1.1 8 ms
3c C
Oscillator start-up time (LCP, 16MHz)
3
t
UPOSC
— 0.75 5 ms
4a C
Oscillator start-up time (full swing Pierce, 2MHz)
3
t
UPOSC
— 5.2 40 ms
4b C
Oscillator start-up time (full swing Pierce, 4MHz)
3
t
UPOSC
— 3 20 ms
4c C
Oscillator start-up time (full swing Pierce, 8MHz)
3
t
UPOSC
— 1.8 10 ms
4d C
Oscillator start-up time (full swing Pierce, 16MHz)
3
t
UPOSC
— 1.2 5 ms
4e C
Oscillator start-up time (full swing Pierce, 40MHz)
3
t
UPOSC
—1 4ms
5 D Clock Quality check time-out
t
CQOUT
0.45 — 2.5 s
6 P Clock Monitor Failure Assert Frequency
f
CMFA
200 400 800 KHz
7 P External square wave input frequency
f
EXT
2.0 — 50 MHz
8 D External square wave pulse width low
t
EXTL
9.5 — — ns
9 D External square wave pulse width high
t
EXTH
9.5 — — ns
10 D External square wave rise time
t
EXTR
—— 1ns
11 D External square wave fall time
t
EXTF
—— 1ns
12 D Input Capacitance (EXTAL, XTAL pins)
C
IN
—7—pF
13 P EXTAL Pin Input High Voltage
V
IH,EXTAL
0.75*V
DDPLL
——V
T
EXTAL Pin Input High Voltage
,4
4
Only applies if EXTAL is externally driven
V
IH,EXTAL
——
V
DDPLL
+ 0.3
V
14 P EXTAL Pin Input Low Voltage
V
IL,EXTAL
——
0.25*V
DDPLL
V
T
EXTAL Pin Input Low Voltage
,4
V
IL,EXTAL
V
SSPLL
- 0.3
——V
15 C EXTAL Pin Input Hysteresis
V
HYS,EXTAL
— 180 — mV
16 C
EXTAL Pin oscillation amplitude (loop controlled
Pierce)
V
PP,EXTAL
— 0.9 — V