Si52131-A11A PCI-EXPRESS GEN1, GEN2, & GEN3 TWO-OUTPUT CLOCK GENER- ATOR WITH 25 MHZ REFERENCE CLOCK & ACTIVE LOW-OE PINS Features PCI-Express Gen1, Gen2 & 25 MHz Crystal Input or Clock Gen3 Compliant input 2 Supports Serial ATA (SATA) at I C support with readback 100 MHz capabilities Low power differential output Triangular spread spectrum buffers profile for maximum No termination resistors required electromagnetic interference (EMI) reduction Dedicated active low output enable pins for each output Extended Temperature o Pin selectable spread control 40 to 85 C Ordering Information: Selectable frequencies: 100, 125, 3.3 V Power supply See page 17 and 200 MHz 24-pin QFN package Up two PCI-Express clocks 25 MHz reference clock Pin Assignments Applications Network Attached Storage Wireless Access Point 24 23 22 21 20 19 Multi-function Printer Routers 1 OE DIFF1 VDD REF 1 18 Ideal for Thunderbolt applications VDD DIFF 2 17 REF 1 OE REF 16 3 DIFF1 25 GND Description DIFF1 15 VSS REF 4 14 DIFF0 1 OE DIFF0 5 Si52131-A11A is a high-performance, PCIe clock generator that can 13 DIFF0 VDD DIFF 6 source two PCIe clocks and a buffered 25 MHz reference clock from a 7 8 9 10 11 12 25 MHz crystal or clock input. The PCIe clock outputs are compliant to PCIe Gen 1, Gen 2, and Gen 3 specifications. The device has three Note 1. Internal 100 k-ohm pull-down resistor active low output enable pins for enabling and disabling each output. The device features two input select pins for frequency selection and spread control. The small footprint and low power consumption makes Si52131- Patents pending A11A the ideal clock solution for consumer and embedded applications. Functional Block Diagram XIN/CLKIN 25MHz XOUT DIFF0 PLL1 Divider (SSC) DIFF1 SCLK SDATA Control & Memory OE REF OE DIFF 1:0 Control RAM SSC 1:0 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.0 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice August 22, 2021 1 SS0 VSS CORE 1 SS1 XIN/CLKIN NC XOUT VDD CORE NC SDATA NC VDD DIFF SCLKSi52131-A11A 2 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.0 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice August 22, 2021