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ST72325 Datasheet(PDF) 150 Page - STMicroelectronics

Part # ST72325
Description  8-bit MCU with 16 to 60K Flash/ROM, ADC, CSS, 5 timers, SPI, SCI, I2C interface
PDF  196 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72325 Datasheet(HTML) 150 Page - STMicroelectronics

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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 is based on
characterization results with specified typical ex-
ternal components. In the application, the resona-
tor 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...).
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.
2. Data based on characterisation results, not tested in production.
Symbol
Parameter
Conditions
Min
Max
Unit
fOSC
Oscillator Frequency 1)
116
MHz
RF
Feedback resistor2)
20
40
k
Ω
CL1
CL2
Recommended load capacitance ver-
sus equivalent serial resistance of the
crystal or ceramic resonator (RS)
3)
fOSC= 1 to 2 MHz
fOSC= 2 to 4 MHz
fOSC= 4 to 8 MHz
fOSC= 8 to 16 MHz
20
20
15
15
60
50
35
35
pF
Symbol
Parameter
Conditions
Typ
Max
Unit
i2
OSC2 driving current
VDD=5V:
fOSC= 2MHz, C0 = 6pF, Cl1 = Cl2 = 68pF
fOSC= 4MHz, C0 = 6pF, Cl1 = Cl2 = 68pF
fOSC= 8MHz, C0 = 6pF, Cl1 = Cl2 = 40pF
fOSC= 16MHz, C0 = 7pF, Cl1 = Cl2 = 20pF
426
425
456
660
µA



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