Si5321 SONET/SDH PRECISION CLOCK MULTIPLIER IC Features Ultra-low jitter clock output with jitter Digital hold for loss-of-input clock generation as low as 0.3 ps Support for 255/238 (15/14), RMS 255/237 (85/79), and 66/64 FEC scaling No external components (other than a (ITU-T G.709 and IEEE 802.3ae) resistor and bypassing) Selectable loop bandwidth Input clock ranges at 19, 39, 78, 155, Si5321 311, or 622 MHz Loss-of-signal alarm output Si5321 Output clock ranges at 19, 39, 78, 155, Low power 311, 622, 1244, or 2488 MHz Small size (9 x 9 mm) Maximum range includes 693 MHz for Backwards compatible with Si5320 10 GbE FEC support Ordering Information: Applications See page 30. SONET/SDH line/port cards Core switches Terabit routers Digital cross connects Description The Si5321 is a precision clock multiplier that exceeds the requirements of high-speed communication systems, including OC-192/OC-48 and 10 Gigabit Ethernet. This device phase locks to an input clock in the 19, 39, 78, 155, 311 or 622 MHz frequency range and generates a frequency-multiplied clock output that can be configured for operation in the 19, 39, 78, 155, 622, 1244, or 2488 MHz frequency range. Skyworks Solutions DSPLL technology provides PLL functionality with unparalleled performance. It eliminates external loop filter components, provides programmable loop parameters, and simplifies design. FEC rates are supported by selectable forward and reverse 255/238 (15/14), 255/237 (85/79), and 66/64 (33/32) conversion factors. The ITU-T G.709 255/237 rate and the IEEE 802.3ae 66/64 rate are supported when using a 155 MHz or higher rate input clock. The performance and integration of Skyworks Solutions Si5321 clock IC provides high-level support of the latest specifications and systems. It operates from a single 3.3 V supply. Functional Block Diagram REXT VSEL33 VDD GND Biasing & Supply Regulation FXDDELAY CAL ACTV CLKIN+ DH ACTV 2 CLKIN DSPLL CLKOUT+ CLKOUT 2 VALTIME FRQSEL 2:0 Signal Detect LOS 3 2 2 Calibration RSTN/CAL BWBOOST FEC 2:0 BWSEL 1:0 INFRQSEL 2:0 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 2.5 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice August 19, 2021Si5321 2 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 2.5 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice August 19, 2021