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CST12.0MTWA Datasheet(PDF) 117 Page - STMicroelectronics |
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CST12.0MTWA Datasheet(HTML) 117 Page - STMicroelectronics |
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117 / 153 page  ST72334J/N, ST72314J/N, ST72124J 117/153 CLOCK AND TIMING CHARACTERISTICS (Cont’d) 16.5.3 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...). 16.5.3.1 Typical Crystal Resonators Figure 68. Application with a Crystal Resonator Notes: 1. Resonator characteristics given by the crystal manufacturer. 2. tSU(OSC) is the typical oscillator start-up time measured between VDD=2.8V and the fetch of the first instruction (with a quick VDD ramp-up from 0 to 5V (<50µs). 3. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value. Refer to crystal manufacturer for more details. Symbol Parameter Conditions Min Max Unit fOSC Oscillator Frequency 3) 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 40 k Ω CL1 CL2 Recommended load capacitance ver- sus equivalent serial resistance of the crystal or ceramic resonator (RS) RS=200Ω LP oscillator RS=200Ω MP oscillator RS=200Ω MS oscillator RS=100Ω HS oscillator 38 32 18 15 56 46 26 21 pF i2 OSC2 driving current VDD=5V LP oscillator VIN=VSS MP oscillator MS oscillator HS oscillator 40 110 180 400 100 190 360 700 µA Option Byte Config. Reference Freq. Characteristic 1) CL1 [pF] CL2 [pF] tSU(osc) [ms] 2) LP S-200-30-30/50 2MHz ∆f OSC=[±30ppm25°C,±30ppm ∆Ta], Typ. RS=200Ω 33 34 10~15 MP SS3-400-30-30/30 4MHz ∆f OSC=[±30ppm25°C,±30ppm ∆Ta], Typ. RS=60Ω 33 34 7~10 MS SS3-800-30-30/30 8MHz ∆f OSC=[±30ppm25°C,±30ppm ∆Ta], Typ. RS=25Ω 33 34 2.5~3 HS SS3-1600-30-30/30 16MHz ∆f OSC=[±30ppm25°C,±30ppm ∆Ta], Typ. RS=15Ω 33 34 1~1.5 OSC2 OSC1 fOSC CL1 CL2 i2 RF ST72XXX RESONATOR |
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