Si52142xx PCI-EXPRESS GEN 1, GEN 2, & GEN 3 TWO-O UTPUT CLOCK GENERATOR WITH 25 MHZ REFERENCE CLOCK Features PCI-Express Gen 1, Gen 2, Gen 3, Up to two PCI-Express clocks and Gen 4 common clock compliant 25 MHz reference clock output Gen 3 SRNS Compliant 25 MHz crystal input or clock input Two 100 MHz, 125 MHz, or 200 MHz Signal integrity tuning differential clock outputs 2 I C support with readback Supports Serial ATA (SATA) at capabilities 100 MHz Triangular spread spectrum profile Low power, push-pull HCSL for maximum electromagnetic compatible differential outputs interference (EMI) reduction No termination resistors required Industrial temperature Dedicated output enable hardware 40 to 85 C Ordering Information: pins for each clock output 3.3 V power supply See page 18. Dedicated hardware pins for spread 24-pin QFN package spectrum and frequency control on differential outputs Pin Assignments Applications Network attached storage Wireless access point Multi-function printer Routers 24 23 22 21 20 19 1 VDD REF 1 18 OE DIFF1 Description VDD DIFF 17 REF 2 1 16 The Si52142 is a spread-spectrum enabled PCIe clock generator that can source OE REF 3 DIFF1 25 GND two PCIe clocks and a 25 MHz reference clock. The device has three hardware 15 DIFF1 VSS REF 4 output enable pins for enabling the respective outputs, and two hardware pins to 14 DIFF0 1 OE DIFF0 5 control spread spectrum and frequency on PCIe clock outputs. In addition to the 13 DIFF0 VDD DIFF 6 2 hardware control pins, I C programmability is also available to dynamically control 7 8 9 10 11 12 skew, edge rate, and amplitude on the true, compliment, or both differential signals on the PCIe clock outputs. This control feature enables optimal signal Notes: integrity as well as optimal EMI signature on the PCIe clock outputs. 1. Internal 100 kohm pull-up. 2. Internal 100 kohm pull-down. Refer to AN636 for signal integrity and configurability. Measuring PCIe clock jitter is quick and easy with the Skyworks Solutions PCIe Clock Jitter Tool. Download it Patents pending for free at Si52142xx 2 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.4 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice November 23, 2021