MC68LC302 Datasheet, PDF (123/169 Pages) Motorola, Inc – Low Power Integrated Multiprotocol Processor Reference Manual

Electrical Characteristics
6.6 DC ELECTRICAL CHARACTERISTICS—NMSI1 IN IDL MODE
Characteristic
Symbol
Min
Max
Unit
Input Pin Characteristics: L1CLK, L1SY1, L1RXD, L1GR
Input Low Level Voltage
Input High Level Voltage
Input Low Level Current
Input High Level Current
V_IL
-10%
+ 20%
V
V_IH
V_DD - 20%
V_DD + 10%
V
II_L
—
± 10
µA
II_H
—
± 10
µA
Output Pin Characteristics: L1TXD, SDS1- SDS2, L1RQ
Output Low Level Voltage
Output High Level Voltage
V_OL
0
1.0
V
V_OH
V_DD - 1.0
V_DD
V
Condition
(% of V_DD)
V_in = V_ss
V_in = V_DD
I_OL = 5.0 mA
I_OH = 400 µA
6.7 AC ELECTRICAL SPECIFICATIONS—CLOCK TIMING
(see Figure 6-1)
16.67 MHz
20 MHz
25 MHz
Num.
Characteristic
Symbol Min Max Min Max Min Max Unit
System Frequency
Crystal Frequency
On-Chip VCO System Frequency
fsys
f_XTAL
fsys
dc 16.67 dc 20.00 dc 25.00 MHz
25 6000 25 6000 25 6000 kHz
10 16.67 10 20 10 25 MHz
Start-up Time
With external clock (oscillator disabled) or
t_pll
after changing the multiplication factor MF.
With external crystal oscillator enabled.
t_osc
2500
75,000
2500
75,000
2500
clks
75,000
CLKO stability
∆CLK TBD TBD TBD TBD TBD TBD %
1 CLKO Period
t_cyc
60
-
50
-
40
-
ns
1A EXTAL Duty Cycle
t_dcyc
40
60
40
60
40
60
%
1C External Clock Input Period
t_EXTcyc 60
-
50
-
40
-
ns
2,3 CLKO Pulse width (measured at 1.5v)
t_cw
TBD
-
TBD
-
TBD
-
ns
4,5 CLKO Rise and fall times (full drive)
t_Crf
-
5
-
4
-
4
ns
5B EXTAL to CLKO skew (PLL disabled)
t_EXTP
2
11
2
9
2
7
ns
Note: The minimum VCO frequency and the PLL default values put some restrictions on the minimum system frequency.
EXTAL
(INPUT)
CLKO
(OUTPUT)
4
1A
1C
1
5B
VOLTAGE MIDPOINT
2
3
5
Figure 6-1. Clock Timing Diagram
6-6
MC68LC302 REFERENCE MANUAL
MOTOROLA