参数资料
型号: ST72F324K2B6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, PLASTIC, SDIP-32
文件页数: 32/156页
文件大小: 1027K
代理商: ST72F324K2B6
ST72324J/K
127/156
CLOCK CHARACTERISTICS (Cont’d)
12.5.5 Clock Security System (CSS)
Note:
1. Data based on characterization results.
12.5.6 PLL Characteristics
Operating conditions: VDD 3.8 to 5.5V @ TA 0to 70°C
1) or V
DD 4.5 to 5.5V @ TA -40 to 125°C
Note:
1. Data characterized but not tested.
Figure 72. PLL Jitter vs. Signal frequency1
The user must take the PLL jitter into account in
the application (for example in serial communica-
tion or sampling of high frequency signals). The
PLL jitter is a periodic effect, which is integrated
over several CPU cycles. Therefore the longer the
period of the application signal, the less it will be
impacted by the PLL jitter.
Figure 72 shows the PLL jitter integrated on appli-
cation signals in the range 125kHz to 2MHz. At fre-
quencies of less than 125KHz, the jitter is negligi-
ble.
Note 1: Measurement conditions: fCPU = 4MHz, TA=25°C
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fSFOSC
Safe Oscillator Frequency 1)
3
MHz
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDD(PLL)
PLL Operating Range
TA 0to 70°C
3.8
5.5
V
TA -40 to +125°C
4.5
5.5
fOSC
PLL input frequency range
2
4
MHz
fCPU/ fCPU
Instantaneous PLL jitter 1)
fOSC = 4 MHz.
1.0
2.5
%
fOSC = 2 MHz.
2.5
4.0
%
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
2000
1000
500
250
125
Application Signal Frequency (KHz)
+/-Jitter
(%)
PLL ON
PLL OFF
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