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ST7L19 数据表(PDF) 109 Page - STMicroelectronics |
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ST7L19 数据表(HTML) 109 Page - STMicroelectronics |
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109 / 138 page  ST7L15, ST7L19 109/138 CLOCK AND TIMING CHARACTERISTICS (cont’d) 13.5.3 Crystal and Ceramic Resonator Oscillators The ST7 internal clock can be supplied with ten 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 must 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 21 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 74. Typical Application with a Crystal or Ceramic Resonator Symbol Parameter Conditions Min Typ Max Unit fCrOSC Crystal oscillator frequency1) 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) CL14) (pF) CL24) (pF) Rd ( Ω) Supply Voltage Range (V) Temperature Range (°C) Type3) Reference Murata 1 SMD CSBFB1M00J58-R0 220 220 2.2k 3.6V to 5.5V -40 to +125 LEAD CSBLA1M00J58-B0 2 SMD CSTCC2M00G56Z-R0 (47) (47) 0 3.0V to 5.5V 4 SMD CSTCR4M00G53Z-R0 (15) (15) 0 LEAD CSTLS4M00G53Z-B0 8 SMD CSTCE8M00G52Z-R0 (10) (10) 0 LEAD CSTLS8M00G53Z-B0 (15) (15) 0 12 SMD CSTCE12M0G52Z-R0 (10) (10) 0 3.6V to 5.5V 16 SMD CSTCE16M0V51Z-R0 (5) (5) 0 LEAD CSTLS16M0X51Z-B0 OSC2 OSC1 fOSC CL1 CL2 i2 ST7 RESONATOR WHEN RESONATOR WITH INTEGRATED CAPACITORS Rd |
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