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LQFP64 Datasheet(PDF) 76 Page - STMicroelectronics |
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LQFP64 Datasheet(HTML) 76 Page - STMicroelectronics |
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76 / 116 page  Package pinouts and signal descriptions SPC560B40x/50x, SPC560C40x/50x 76/116 DocID14619 Rev 13 Figure 16. Equivalent circuit of a quartz crystal C0 C2 C1 C2 Rm C1 Lm Cm Crystal Table 39. Crystal motional characteristics(1) Symbol Parameter Conditions Value Unit Min Typ Max Lm Motional inductance — — 11.796 — KH Cm Motional capacitance — — 2 — fF C1/C2 Load capacitance at OSC32K_XTAL and OSC32K_EXTAL with respect to ground(2) — 18 — 28 pF Rm (3) Motional resistance AC coupled @ C0 = 2.85 pF(4) —— 65 kW AC coupled @ C0 = 4.9 pF(4) —— 50 AC coupled @ C0 = 7.0 pF(4) —— 35 AC coupled @ C0 = 9.0 pF(4) —— 30 1. Crystal used: Epson Toyocom MC306 2. This is the recommended range of load capacitance at OSC32K_XTAL and OSC32K_EXTAL with respect to ground. It includes all the parasitics due to board traces, crystal and package. 3. Maximum ESR (Rm) of the crystal is 50 k 4. C0 includes a parasitic capacitance of 2.0 pF between OSC32K_XTAL and OSC32K_EXTAL pins |
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