 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ST72324BJ2 Datasheet(PDF) 145 Page - STMicroelectronics |
|
|
|||||||||||||||||||||||||||||
ST72324BJ2 Datasheet(HTML) 145 Page - STMicroelectronics |
|
|
145 / 188 page  ST72324B Electrical characteristics 145/188 12.6.3 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 resonator 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 stabilization time. Refer to the crystal/ceramic resonator manufacturer for more details (frequency, package, accuracy...). 8/16 Kbyte Flash and ROM devices Figure 66. Typical application with a crystal or ceramic resonator (8/16 Kbyte Flash and ROM devices) Table 94. Crystal and ceramic resonator oscillators (8/16K Flash and ROM devices) Symbol Parameter Conditions Min Typ Max Unit fOSC Oscillator frequency(1) 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. 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(2) 2. Data based on characterization results, not tested in production. The relatively low value of the RF resistor, offers a good protection against issues resulting from use in a humid environment, due to the induced leakage and the bias condition change. However, it is recommended to take this point into account if the microcontroller is used in tough humidity conditions. 20 40 k Ω CL1 CL2 Recommended load capacitance versus equivalent serial resistance of the crystal or ceramic resonator (RS) (3) 3. For CL1 and CL2 it is recommended to use high-quality ceramic capacitors in the 5pF to 25pF range (typ.) designed for high-frequency applications and selected to match the requirements of the crystal or resonator. CL1 and CL2, are usually the same size. The crystal manufacturer typically specifies a load capacitance which is the series combination of CL1 and CL2. PCB and MCU pin capacitance must be included when sizing CL1 and CL2 (10 pF can be used as a rough estimate of the combined pin and board capacitance). RS = 200Ω LP oscillator RS = 200Ω MP oscillator RS = 200Ω MS oscillator RS = 100Ω HS oscillator 22 22 18 15 56 46 33 33 pF i2 OSC2 driving current VDD = 5V, VIN =VSS LP oscillator MP oscillator MS oscillator HS oscillator 80 160 310 610 150 250 460 910 µA OSC2 OSC1 fOSC CL1 CL2 i2 RF ST72XXX Resonator When resonator with integrated capacitors |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
New Zealand ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
