Si52143 PCI-EXPRESS GEN 1, GEN 2, & GEN 3 QUAD OUTPUT CLOCK GENERATOR WITH 25 MHZ REFERENCE CLOCK Features PCI-Express Gen 1, Gen 2, Gen 3, Four 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 Supports Serial ATA (SATA) at Signal integrity tuning 100 MHz 2 I C support with readback Low power, push-pull HCSL capabilities compatible differential outputs Triangular spread spectrum profile No termination resistors required for maximum electromagnetic Dedicated output enable hardware interference (EMI) reduction pins for each clock output Industrial temperature Spread enable pin on differential 40 to 85 C Ordering Information: clocks 3.3 V power supply See page 18 24-pin QFN package Applications Pin Assignments Network attached storage Wireless access point Multi-function printer Routers Description 24 23 22 21 20 19 1 VDD REF 1 18 OE 3:2 The Si52143 is a spread-spectrum enabled PCIe clock generator that can source 17 VDD DIFF REF 2 four PCIe clocks and a 25 MHz reference clock. The device has three hardware 2 SSON 3 16 DIFF3 output enable pins for enabling the outputs (on the fly while powered on), and one 25 GND 15 DIFF3 hardware pin to control spread spectrum on PCIe clock outputs. In addition to the VSS REF 4 hardware control pins, I2C programmability is also available to dynamically control 14 DIFF2 1 5 OE REF skew, edge rate and amplitude on the true, compliment, or both differential signals 13 DIFF2 VDD DIFF 6 on the PCIe clock outputs. This control feature enables optimal signal integrity as 7 8 9 10 11 12 well as optimal EMI signature on the PCIe clock outputs. Refer to AN636 for signal integrity tuning and configurability. Measuring PCIe clock jitter is quick and easy with the Skyworks Solutions PCIe Clock Jitter Tool. Download it for free at Notes: 1. Internal 100 kohm pull-up. 2. Internal 100 kohm pull-down. Si52143 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 December 7, 2021