MC9S12XD256MAL Datasheet, PDF (1267/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network

Appendix A Electrical Characteristics
Table A-22. 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}
f_OSC
0.5
—
40
MHz
2 P Startup current
i_OSC
100
—
—
µA
3 C Oscillator start-up time (loop controlled Pierce) t_UPOSC
—
—³
50⁴
ms
4 D Clock quality check time-out
t_CQOUT
0.45
2.5
s
5 P Clock monitor failure assert frequency
f_CMFA
50
100
200
KHz
6 P External square wave input frequency
f_EXT
0.5
—
80
MHz
7 D External square wave pulse width low
t_EXTL
5
—
—
ns
8 D External square wave pulse width high
t_EXTH
5
—
—
ns
9 D External square wave rise time
t_EXTR
—
—
1
ns
10 D External square wave fall time
t_EXTF
—
—
1
ns
11 D Input capacitance (EXTAL, XTAL inputs)
12 P EXTAL pin input high voltage⁵
T EXTAL pin input high voltage⁵
C_IN
V_IH,EXTAL
V_IH,EXTAL
—
0.75*
V_DDPLL
—
7
—
pF
—
—
V
—
V_DDPLL +
V
0.3
13 P EXTAL pin input low voltage⁵
T EXTAL pin input low voltage⁵
V_IL,EXTAL
—
—
V_IL,EXTAL
V_SSPLL –
—
0.3
0.25*
V
V_DDPLL
—
V
14 C EXTAL pin input hysteresis⁵
V_HYS,EXTAL
—
250
—
mV
1 _{Depending on the crystal a damping series resistor might be necessary}
2 _{XCLKS = 0}
3 _{fosc = 4 MHz, C = 22 pF.}
4 _{Maximum value is for extreme cases using high Q, low frequency crystals}
5 _{If full swing Pierce oscillator/external clock circuitry is used. (XCLKS = 0)}
Freescale Semiconductor
MC9S12XDP512 Data Sheet, Rev. 2.21
1269