参数资料
型号: ST72F324LK6T6
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, PQFP32
封装: 7 X 7 MM, TQFP-32
文件页数: 21/154页
文件大小: 3519K
代理商: ST72F324LK6T6
ST72324Lxx
117/154
CLOCK AND TIMING CHARACTERISTICS (Cont’d)
12.5.3 Crystal and Ceramic Resonator Oscillators
The ST7 internal clock can be supplied with four
different Crystal/Ceramic resonator oscillators. All
the information given in this paragraph are based
on characterization results with specified typical
external components. In the application, the reso-
nator and the load capacitors have to be placed as
close as possible to the oscillator pins in order to
minimize output distortion and start-up stabiliza-
tion time. Refer to the crystal/ceramic resonator
manufacturer for more details (frequency, pack-
age, accuracy...).
Figure 63. Typical Application with a Crystal or Ceramic Resonator
Notes:
1. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value.
Refer to crystal/ceramic resonator manufacturer for more details.
Symbol
Parameter
Conditions
Min
Max
Unit
fOSC
Oscillator Frequency 1)
LP: Low power oscillator
MP: Medium power oscillator
MS: Medium speed oscillator
HS: High speed oscillator
1
>2
>4
>8
2
4
8
16
MHz
RF
Feedback resistor
20
k
CL1
CL2
Recommended load capacitance ver-
sus equivalent serial resistance of the
crystal or ceramic resonator (RS)
RS=200
LP osc. (1-2 MHz)
RS=200
MP osc. (2-4 MHz)
RS=200
MS osc. (4-8 MHz)
RS=100
HS osc. (8-16 MHz)
22
18
15
56
46
33
pF
Symbol
Parameter
Conditions
Typ
Max
Unit
i2
OSC2 driving current
VIN=VSS
LP osc. (1-2 MHz)
MP osc. (2-4 MHz)
MS osc. (4-8 MHz)
HS osc. (8-16 MHz)
80
160
310
610
150
250
460
910
A
OSC2
OSC1
fOSC
CL1
CL2
i2
RF
ST72XXX
RESONATOR
WHEN RESONATOR WITH
INTEGRATED CAPACITORS
1
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