Datasheet

MC68HC908JL3E Family Data Sheet, Rev. 4
Freescale Semiconductor 161
A.5.3 Control Timing
A.5.4 Oscillator Characteristics
Table A-3. Control Timing
Characteristic
(1)
1. V
DD
= 2.2 Vdc, V
SS
= 0 Vdc, T
A
= T
L
to T
H
; timing shown with respect to 20% V
DD
and 70% V
DD
, unless otherwise noted.
Symbol Min Max Unit
Internal operating frequency
(2)
2. Some modules may require a minimum frequency greater than dc for proper operation; see appropriate table for this infor-
mation.
f
OP
—2MHz
RST
input pulse width low
(3)
3. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
t
IRL
1.5 — μs
Table A-4. Oscillator Component Specifications
Characteristic Symbol Min Typ Max Unit
Crystal frequency, XTALCLK
f
OSCXCLK
—— 8 MHz
External clock reference frequency
(1)
1. No more than 10% duty cycle deviation from 50%
f
OSCXCLK
dc — 8 MHz
Crystal load capacitance
(2)
2. Consult crystal vendor data sheet
C
L
—— —
Crystal fixed capacitance
(2)
C
1
—
2 ×
C
L
—
Crystal tuning capacitance
(2)
C
2
—
2 ×
C
L
—
Feedback bias resistor
R
B
— 10 MΩ —
Series resistor
(2), (3)
3. Not Required for high frequency crystals
R
S
—— —