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AT89C5132-ROTIL Scheda tecnica(PDF) 157 Page - ATMEL Corporation |
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AT89C5132-ROTIL Scheda tecnica(HTML) 157 Page - ATMEL Corporation |
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157 / 182 page  157 4173E–USB–09/07 AT89C5132 23.2.4 Oscillator and Crystal 23.2.4.1 Schematic Figure 23-4. Crystal Connection Note: For operation with most standard crystals, no external components are needed on X1 and X2. It may be necessary to add external capacitors on X1 and X2 to ground in special cases (max 10 pF). X1 and X2 may not be used to drive other circuits. 23.2.4.2 Parameters Table 105. Oscillator and Crystal Characteristics VDD = 2.7 to 3.3V , TA = -40 to +85°C 23.2.5 Phase Lock Loop 23.2.5.1 Schematic Figure 23-5. PLL Filter Connection VSS X1 X2 Q C1 C2 Symbol Parameter Min Typ Max Unit C X1 Internal Capacitance (X1 - VSS) 10 pF C X2 Internal Capacitance (X2 - VSS) 10 pF C L Equivalent Load Capacitance (X1 - X2) 5 pF DL Drive Level 50 µ W F Crystal Frequency 20 MHz RS Crystal Series Resistance 40 Ω CS Crystal Shunt Capacitance 6 pF VSS FILT R C1 C2 VSS |
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