PXD20 Datasheet, PDF (86/130 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Electrical characteristics
4.10 Fast external crystal oscillator (4–16 MHz) electrical
characteristics
This device implements the fast external oscillator (FXOSC) using a low power Loop Controlled Pierce Oscillator (LCP)
configuration.
Table 37. Fast external crystal oscillator electrical characteristics
Symbol
Parameter
Conditions
Value
Min Typ Max
Unit SpecID
f_OSC
i_OSC
t_UPOSC
t_CQOUT
f_CMFA
f_EXT
t_EXTL
C Crystal oscillator range
P Startup current
C Oscillator start-up time
D Clock quality check time-out
D Clock monitor failure assert
frequency
D External square wave input
frequency²
D External square wave pulse
width low
Loop controlled Pierce 4.0
—
16 MHz O9.1
—
100
—
—
µA O9.2
Loop controlled Pierce
4¹
50²
ms O9.3
—
0.45
—
2.5
s
O9.4
—
200 400 800 kHz O9.5
—
2.0
—
50 MHz O9.6
—
9.5
—
—
ns O9.7
t_EXTH
D External square wave pulse
width high
—
9.5
—
—
ns
t_EXTR
D External square wave rise time
—
—
—
1
ns
t_EXTF
D External square wave fall time
—
—
—
1
ns
C_IN
D Input capacitance
EXTAL and XTAL pins
—
7
—
pF
V_IH,EXTAL
P EXTAL pin input high voltage²
—
0.75  —
—
V
V_DDPLL
T
—
— V_DDPLL
+ 0.3
V_IL,EXTAL
P EXTAL pin input low voltage²
—
—
— 0.25  V
V_DDPLL
T
V_SSPLL —
—
– 0.3
V_HYS,EXTAL C EXTAL pin input hysteresis²
—
180
—
mV
V_PP,EXTAL C EXTAL pin oscillation amplitude Loop controlled Pierce
—
1.0
—
V
1 _{fOSC = 4 MHz, C = 22 pF}
2 _{Maximum value is for extreme cases using high Q, low frequency crystals}
O9.8
O9.9
O9.10
O9.11
O9.12
O9.13
O9.14
O9.15
PXD20 Microcontroller Data Sheet, Rev. 2
86
Preliminary—Subject to Change Without Notice
Freescale Semiconductor