mcf54455 Freescale Semiconductor, Inc, mcf54455 Datasheet - Page 21

• Manufacturer Part Number: mcf54455
• Description: 32-bit Microprocessor With Usb On-the-go, Ethernet, Pci, Ddr2/ddr Controller And Encryption
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
Num
19
10
11
12
1
2
3
4
5
6
7
8
9
Input Clock (CLKIN)
PLL Reference Frequency Range
Core/System Frequency
Core/System Clock Period
VCO Frequency (f
Crystal Start-up Time
EXTAL Input High Voltage
EXTAL Input Low Voltage
EXTAL Input Rise & Fall Time (20% to 80% E
(External, Limp)
PLL Lock Time
Duty Cycle of reference
XTAL Current
Total on-chip stray capacitance on XTAL
Total on-chip stray capacitance on EXTAL
Crystal capacitive load
Crystal Mode
All other modes (External, Limp)
Crystal Mode
All other modes (External, Limp)
Crystal reference
External reference
4
4
3, 5
vco
Characteristic
= f
2, 3
MCF5445x ColdFire
ref
3
(External, Limp)
× PFDR)
Table 10. PLL Electrical Characteristics
Figure 7. Input Clock Timing Diagram
C4
C1
®
VDD
Microprocessor Data Sheet, Rev. 0
C4
)
C
f
Symbol
C
ref_crystal
V
V
V
V
f
S_EXTAL
ref_ext
I
S_XTAL
IHEXT
IHEXT
ILEXT
ILEXT
XTAL
f
t
f
t
t
C
t
sys
sys
vco
cst
lpll
dc
L
E
C3
V
VDD
XTAL
512 Hz
Value
Min.
300
16
16
40
See crystal spec
—
—
/2 + 0.4
—
—
—
—
—
1
1
+ 0.4
1
C2
E
266.67 MHz
V
VDD
Electrical Characteristics
XTAL
50000
Value
66.66
1/f
Max.
540
1.5
1.5
40
10
—
—
60
/2 - 0.4
2
3
sys
- 0.4
CLKIN
MHz
MHz
MHz
Unit
mA
ms
pF
pF
ns
ns
—
%
V
V
V
V
21