SL28PCIe25 EProClock PCI Express Gen 2 & Gen 3 Generator Features Optimized 100 MHz Operating Frequencies to Meet the 2 I C support with readback capabilities Next Generation PCI-Express Gen 2 & Gen 3 Triangular Spread Spectrum profile for maximum Low power push-pull type differential output buffers electromagnetic interference (EMI) reduction Integrated voltage regulator 25MHz Crystal Input or Clock input Integrated resistors on differential clocks o o Industrial Temperature -40 C to 85 C Four 100-MHz differential PCI-Express clocks 3.3V Power supply Low jitter (<50pS) 32-pin QFN package Buffered Reference Clock 25MHz EProClock Programmable Technology SRC 25M x4 x1 Pin Configuration Block Diagram Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 0.2 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 5, 2021 SL28PCIe25 32-QFN Pin Definitions Pin No. Name Type Description 1 VDD PWR 3.3V Power Supply 2 VSS GND Ground 3 NC NC No Connect. 4 NC NC No Connect. 5 VDD PWR 3.3V Power Supply 6 NC NC No Connect. 7 NC NC No Connect. 8 VSS GND Ground 9 VSS GND Ground 10 SRC0 O, DIF 100MHz True differential serial reference clock 11 SRC0 O, DIF 100MHz Complement differential serial reference clock 12 VSS GND Ground 13 SRC1 O, DIF 100MHz True differential serial reference clock 14 SRC1 O, DIF 100MHz Complement differential serial reference clock 15 VDD PWR 3.3V Power Supply 16 NC NC No Connect. 17 VDD PWR 3.3V Power Supply 18 VDD PWR 3.3V Power Supply 19 SRC2 O, DIF 100MHz Complement differential serial reference clock 20 SRC2 O, DIF 100MHz True differential serial reference clock 21 VSS GND Ground 22 SRC3 O, DIF 100MHz Complement differential serial reference clock 23 SRC3 O, DIF 100MHz True differential serial reference clock 24 VDD PWR 3.3V Power Supply 25 CKPWRGD/PD I 3.3V LVTTL input pin. When PD is asserted low, the device will power down. 26 VSS GND Ground 27 XOUT O, SE 25MHz Crystal output, Float XOUT if using CLKIN (Clock Input) 28 XIN/CLKIN I 25MHz Crystal input or 3.3V, 25MHz Clock input 29 VDD PWR 3.3V Power Supply 30 REF O 3.3V, 25MHz clock output. 31 SDATA I/O SMBus compatible SDATA 32 SCLK I SMBus compatible SCLOCK Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 Rev. 0.2 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 5, 2021