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| 型号： | MAC7121MAG40 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP112 |
| 封装： | 20 X 20 MM, 0.65 MM PITCH, ROHS COMPLIANT, LQFP-112 |
| 文件页数： | 10/56页 |
| 文件大小： | 1216K |
| 代理商： | MAC7121MAG40 |
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MAC7100 Microcontroller Family Hardware Specifications, Rev. 1.2
Preliminary
Electrical Characteristics
Freescale Semiconductor
18
3.8.3
PLL Characteristics
3.8.4
Crystal Monitor Time-out
The time-out Table 21 shows the delay for the crystal monitor to trigger when the clock stops, either at the high
or at the low level. The corresponding clock period with an ideal 50% duty cycle is twice this time-out value.
3.8.5
Clock Quality Checker
The timing for the clock quality check is derived from the oscillator and the VCO frequency range in
Table 20. These numbers define the upper time limit for the individual check windows to complete.
Table 20. PLL Characteristics
Num C
Rating
Symbol
Min
Typ
Max
Unit
K1
PLL reference frequency, crystal oscillator range
fREF
0.5
—
16
MHz
K2
P Self Clock Mode frequency
fSCM
2—
5.5
MHz
K3
D VCO locking range
fVCO
1
NOTES:
1. If CLKSEL[PLLSEL] is set then the system clock (fSYS) is equal to fVCO, otherwise it is equal to fOSC (table Table 19,
8—
50
MHz
K4
D Lock Detector transition from Acquisition to Tracking mode
|Δ
trk|
3—4
% 2
2. Percentage deviation from target frequency
K5
D Lock Detection
|Δ
Lock|
0—
1.5
% 2
K6
D Un-Lock Detection
|Δ
unl|
0.5
—
2.5
% 2
K7
D Lock Detector transition from Tracking to Acquisition mode
|Δ
unt|
6—8
% 2
K8
C PLLON Total Stabilization delay (Auto Mode) 3
3. PLL stabilization delay is highly dependent on operational requirement and external component values (for
example, crystal and XFC filter component values). Notes 4 and 5 show component values for a typical
configurations. Appropriate XFC filter values should be chosen based on operational requirement of system.
tstab
—0.5 4
4. fOSC = 4 MHz, fVCO = 40 MHz (REFDV = 0x00, SYNR = 0x04), CS = 2.2 nF, CP = 220 pF, RS = 5.6 KΩ.
3 5
5. fOSC = 4 MHz, fVCO = 16 MHz (REFDV = 0x00, SYNR = 0x01), CS = 4.7 nF, CP = 470 pF, RS = 2.7 KΩ.
ms
K9
D PLLON Acquisition mode stabilization delay 3
tacq
—0.3 4
1 5
ms
K10
D PLLON Tracking mode stabilization delay 3
tal
—0.2 4
2 5
ms
K11
D Charge pump current acquisition mode
| i
ch |
—
38.5
—
μA
K12
D Charge pump current tracking mode
| i
ch |
—3.5
—
μA
K13
D Jitter fit VCO loop gain parameter
K1
—
–195
—
MHz/V
K14
D Jitter fit VCO loop frequency parameter
f1
—
126
—
MHz
K15
C Jitter fit parameter 1
j1
——
1.3
% 4
K16
C Jitter fit parameter 2
j2
—
0.12
% 4
Table 21. Crystal Monitor Time-Outs
Min
Typ
Max
Unit
610
18.5
μs
Table 22. CRG Maximum Clock Quality Check Timings
Clock Check Windows
Value
Unit
Check Window
9.1 to 20.0
ms
Timeout Window
0.46 to 1.0
s
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相关代理商/技术参数 |
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| MAC7121MAG50 | 制造商:Freescale Semiconductor 功能描述: |
| MAC7121MFU | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:MAC7100 Microcontroller Family Hardware Specifications |
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