Datasheet PI6CG33401 (Diodes) - 21
| Manufacturer | Diodes |
| Description | 3.3V Very-Low-Power 4-Output PCIe Clock Generator With On-Chip Termination |
| Pages / Page | 23 / 21 — PI6CG33401. Crystal Circuit Connection. Crystal Oscillator Circuit. … |
| File Format / Size | PDF / 1.4 Mb |
| Document Language | English |
PI6CG33401. Crystal Circuit Connection. Crystal Oscillator Circuit. Crystal Capacitor Calculation. XTAL_IN. XTAL_OUT
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PI6CG33401 Crystal Circuit Connection
The following diagram shows PI6CG33401 crystal circuit connection with a parallel crystal. For the CL = 8pF crystal, it is suggested to use C1 = 8pF and C2 = 8pF. C1 and C2 can be adjusted to fine tune to the target ppm of crystal oscillator according to different board layouts based on the following formula in the Crystal Capacitor Calculation diagram.
Crystal Oscillator Circuit
XTAL_IN C1 8pF FL2500262Q Crystal�(C =�8pF) L� XTAL_OUT C2 8pF
Crystal Capacitor Calculation XTAL_IN XTAL_OUT CL= crystal spec. loading cap. Cj = chip in/output cap. (3~5pF) Cj Cj Cb = PCB trace/via cap. (2~4pF) Rf Pseudo Rd C1, C2 = load cap. components Cb sine Rd = drive level res. (100Ω) Cb C1 C2 Final choose/trim C1=C2=2 *CL - (Cb +Cj) for the target +/-ppm Example: C1=C2=2*(18pF) – (4pF+5pF)=27pF Recommended Crystal Specification Diodes recommends:
a) FL2500217, SMD 3.2x2.5(4P), 25MHz, CL=8pF, +/-20ppm, https://www.diodes.com/assets/Datasheets/FL.pdf b) FH2500016, SMD 2.5x2.0(4P), 25MHz, CL=8pF, +/-30ppm, https://www.diodes.com/assets/Datasheets/FH.pdf c) FW2500031, SMD 2.0x1.6(4P), 25MHz, CL=8pF, +/-30ppm, https://www.diodes.com/assets/Datasheets/FW.pdf d) US2500003, SMD 1.6x1.2(4P), 25MHz, CL=12pF, +/-30ppm, https://www.diodes.com/assets/Datasheets/US.pdf
Part Marking
Top mark not available at this time. To obtain advanced information regarding the top mark, contact your local sales representative. PI6CG33401 Document Number DS41072 Rev 4-2 21 www.diodes.com September 2019 Diodes Incorporated
PI6CG33401 Crystal Circuit Connection
The following diagram shows PI6CG33401 crystal circuit connection with a parallel crystal. For the CL = 8pF crystal, it is suggested to use C1 = 8pF and C2 = 8pF. C1 and C2 can be adjusted to fine tune to the target ppm of crystal oscillator according to different board layouts based on the following formula in the Crystal Capacitor Calculation diagram.
Crystal Oscillator Circuit
XTAL_IN C1 8pF FL2500262Q Crystal�(C =�8pF) L� XTAL_OUT C2 8pF
Crystal Capacitor Calculation XTAL_IN XTAL_OUT CL= crystal spec. loading cap. Cj = chip in/output cap. (3~5pF) Cj Cj Cb = PCB trace/via cap. (2~4pF) Rf Pseudo Rd C1, C2 = load cap. components Cb sine Rd = drive level res. (100Ω) Cb C1 C2 Final choose/trim C1=C2=2 *CL - (Cb +Cj) for the target +/-ppm Example: C1=C2=2*(18pF) – (4pF+5pF)=27pF Recommended Crystal Specification Diodes recommends:
a) FL2500217, SMD 3.2x2.5(4P), 25MHz, CL=8pF, +/-20ppm, https://www.diodes.com/assets/Datasheets/FL.pdf b) FH2500016, SMD 2.5x2.0(4P), 25MHz, CL=8pF, +/-30ppm, https://www.diodes.com/assets/Datasheets/FH.pdf c) FW2500031, SMD 2.0x1.6(4P), 25MHz, CL=8pF, +/-30ppm, https://www.diodes.com/assets/Datasheets/FW.pdf d) US2500003, SMD 1.6x1.2(4P), 25MHz, CL=12pF, +/-30ppm, https://www.diodes.com/assets/Datasheets/US.pdf
Part Marking
Top mark not available at this time. To obtain advanced information regarding the top mark, contact your local sales representative. PI6CG33401 Document Number DS41072 Rev 4-2 21 www.diodes.com September 2019 Diodes Incorporated