參數(shù)資料
型號: MCF54450VM180
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 180 MHz, RISC PROCESSOR, BGA256
封裝: 17 X 17 MM, ROHS COMPLIANT, MAPBGA-256
文件頁數(shù): 14/48頁
文件大?。?/td> 942K
代理商: MCF54450VM180
Electrical Characteristics
MCF5445x ColdFire Microprocessor Data Sheet, Rev. 4
Freescale Semiconductor
21
Figure 7. Input Clock Timing Diagram
1 / C1 Frequency
25
66.66
MHz
C2
Rise time (20% of vdd to 80% of vdd)
-
2
ns
C3
Fall time (80% of vdd to 20% of vdd)
-
2
ns
C4
Duty cycle (at 50% of vdd)
40
60
%
Table 10. PLL Electrical Characteristics
Num
Characteristic
Symbol
Min.
Value
Max.
Value
Unit
1
PLL Reference Frequency Range
Crystal reference
External reference
fref_crystal
fref_ext
16
40
66.66
MHz
2
Core/System Frequency
fsys
512 Hz1
266.67 MHz
Core/System Clock Period
tsys
—1/fsys
ns
19
VCO Frequency (fvco = fref × PFDR)
fvco
300
540
MHz
3
Crystal Start-up Time2, 3
tcst
—10
ms
4
EXTAL Input High Voltage
Crystal Mode4
All other modes (External, Limp)
VIHEXT
VXTAL + 0.4
EVDD/2 + 0.4
V
5
EXTAL Input Low Voltage
Crystal Mode4
All other modes (External, Limp)
VILEXT
VXTAL - 0.4
EVDD/2 - 0.4
V
6
EXTAL Input Rise & Fall Time (20% to 80% EVDD)
(External, Limp)
12ns
7PLL Lock Time 3, 5
tlpll
50000
CLKIN
8
Duty Cycle of reference 3 (External, Limp)
tdc
40
60
%
9
XTAL Current
IXTAL
13
mA
10
Total on-chip stray capacitance on XTAL
CS_XTAL
—1.5
pF
11
Total on-chip stray capacitance on EXTAL
CS_EXTAL
—1.5
pF
Table 9. Input Clock Timing Requirements (continued)
Item
Specification
Min
Max
Unit
Input Clock (CLKIN)
C1
C4
C3
C2
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