Datasheet

Electrical Specifications
Data Sheet MC68HC908LJ24/LK24 — Rev. 2.1
442 Electrical Specifications Freescale Semiconductor
24.11 3.3V Oscillator Characteristics
Figure 24-1. Typical Internal Oscillator Frequency
Table 24-9. 3.3V Oscillator Specifications
Characteristic Symbol Min Typ Max Unit
Internal oscillator clock frequency
f
ICLK
47k
(1)
Notes:
1. Typical value reflect average measurements at midpoint of voltage range, 25 ×C only. See Figure 24-1 for plot.
Hz
External reference clock to OSC1
(2)
2. No more than 10% duty cycle deviation from 50%.
f
OSC
dc — 16M Hz
Crystal reference frequency
(3)
3. Fundamental mode crystals only.
f
XCLK
— 32.768k 4.9152M Hz
Crystal load capacitance
(4)
4. Consult crystal manufacturer’s data.
C
L
———
Crystal fixed capacitance
C
1
—
2 × C
L
(27p)
—F
Crystal tuning capacitance
C
2
—
2 ×
C
L
(33p)
—F
Feedback bias resistor
R
B
—20M—Ω
Series resistor
(5)
5. Not Required for high frequency crystals.
R
S
—100k—Ω
35
23456
60
55
50
45
40
Supply Voltage, V
DD
(V)
Internal OSC frequency, f
ICLK
(kHz)
65
+25 ° C
+85 ° C
+25 ° C
–40 ° C