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ST7LITE2 数据表(PDF) 102 Page - STMicroelectronics |
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ST7LITE2 数据表(HTML) 102 Page - STMicroelectronics |
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102 / 133 page  ST7LITE2 102/133 CLOCK AND TIMING CHARACTERISTICS (Cont’d) 13.5.3 Crystal and Ceramic Resonator Oscillators The ST7 internal clock can be supplied with eight 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...). Notes: 1. When PLL is used, please refer to the PLL characteristics chapter and to “SUPPLY, RESET AND CLOCK MANAGE- MENT” on page 23 chapter (fCrOSC min. is 8 Mhz with PLL). 2. Resonator characteristics given by the ceramic resonator manufacturer. For more information on these resonators, please consult www.murata.com 3. SMD = -R0: Plastic tape package (∅ =180mm) . LEAD = -B0: Bulk 4. () means load capacitor built in resonator Figure 66. Typical application with a crystal or ceramic resonator Symbol Parameter Conditions Min Typ Max Unit fCrOSC Crystal Oscillator Frequency 1) 216 MHz CL1 CL2 Recommended load capacitance ver- sus equivalent serial resistance of the crystal or ceramic resonator (RS) See table below pF Supplier fCrOSC [MHz] Typical Ceramic Resonators2) CL1 4) [pF] CL2 4) [pF] Rd [ Ω] Supply Voltage Range [V] Temperature Range [°C] Type3) Reference 2 SMD CSTCC2M00G56-R0 (47) (47) 0 2.4V to 5.5V -40 to 85 4 SMD CSTCR4M00G53-R0 (15) (15) 0 LEAD CSTLS4M00G53-B0 (15) (15) 0 8 SMD CSTCE8M00G52-R0 (10) (10) 0 LEAD CSTLS8M00G53-B0 (15) (15) 0 16 SMD CSTCE16M0V51-R0 (5) (5) 0 3.3V to 5.5V LEAD CSTLS16M0X53-B0 (15) (15) 0 4.5V to 5.5V LEAD CSALS16M0X55-B0 7 7 1.5k 3.8V to 5.5V OSC2 OSC1 fOSC CL1 CL2 i2 RESONATOR WHEN RESONATOR WITH INTEGRATED CAPACITORS Rd ST7LITE2 |
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