Si5338 2 I C-PROGRAMMABLE ANY-FREQUENCY, ANY-OUTPUT QUAD CLOCK GENERATOR Features Low power MultiSynth technology Single supply core with excellent enables independent, any-frequency PSRR: 1.8, 2.5, 3.3 V synthesis on four differential output Independent frequency increment/ drivers decrement feature enables Highly-configurable output drivers with glitchless frequency adjustments in up to four differential outputs, eight 1 ppm steps single-ended clock outputs, or a Independent phase adjustment on combination of both each of the output drivers with an Low phase jitter of 0.7 ps RMS typ accuracy of <20 ps steps Ordering Information: High precision synthesis allows true Highly configurable spread zero ppm frequency accuracy on all spectrum (SSC) on any output: See page 41. outputs Any frequency from 5 to 350 MHz Flexible input reference: Any spread from 0.5 to 5.0% External crystal: 8 to 30 MHz Any modulation rate from 33 to Pin Assignments CMOS input: 5 to 200 MHz 63 kHz SSTL/HSTL input: 5 to 350 MHz External feedback mode allows zero-delay mode Differential input: 5 to 710 MHz Top View Loss of lock and loss of signal Independently configurable outputs alarms support any frequency or format: 2 LVPECL/LVDS: 0.16 to 710 MHz I C/SMBus compatible interface 24 23 22 21 20 19 HCSL: 0.16 to 250 MHz Easy to use programming software IN1 1 18 CLK1A CMOS: 0.16 to 200 MHz Small size: 4 x 4 mm, 24-QFN 2 17 IN2 CLK1B SSTL/HSTL: 0.16 to 350 MHz Low power: 45 mA core supply typ Independent output voltage per driver: 3 16 Wide temperature range: 40 to IN3 VDDO1 GND GND 1.5, 1.8, 2.5, or 3.3 V +85 C Pad IN4 4 15 VDDO2 5 14 Applications IN5 CLK2A 6 13 IN6 CLK2B Ethernet switch/router Any-frequency clock conversion 7 8 9 10 11 12 PCI Express 2.0/3.0 MSAN/DSLAM/PON Broadcast video/audio timing Fibre Channel, SAN Processor and FPGA clocking Telecom line cards 1 GbE and 10 GbE Description The Si5338 is a high-performance, low-jitter clock generator capable of synthesizing any frequency on each of the device s four output drivers. This timing IC is capable of replacing up to four different frequency crystal oscillators or operating as a frequency translator. Using its patented MultiSynth technology, the Si5338 allows generation of four independent clocks with 0 ppm precision. Each output clock is independently configurable to support various signal formats and supply voltages. The Si5338 provides low-jitter frequency synthesis in a 2 space-saving 4 x 4 mm QFN package. The device is programmable via an I C/ SMBus-compatible serial interface and supports operation from a 1.8, 2.5, or 2 3.3 V core supply. I C device programming is made easy with the ClockBuilder Desktop software available at www.silabs.com/ClockBuilder. Rev. 1.2 8/12 Copyright 2012 by Silicon Laboratories Si5338 VDD VDD INTR RSVD GND CLK3B CLK0A CLK3A CLK0B VDDO3 VDDO0 SCL SDASi5338 Functional Block Diagram VDD Synthesis Output Synthesis Osc noclk Stage Stage 1 Stage 2 VDDO0 (PLL) P1DIV IN IN1 MultiSynth CLK0A ref R0 IN2 P1 M0 CLK0B IN3 VDDO1 Loop VCO Phase Filter MultiSynth CLK1A Frequency R1 M1 P2DIV IN Detector CLK1B fb IN4 P2 VDDO2 IN5 noclk IN6 MultiSynth CLK2A R2 M2 CLK2B MultiSynth Control & Memory N VDDO3 OEB/PINC/FINC CLK3A I2C LSB/PDEC/FDEC MultiSynth R3 M3 NVM Control RAM CLK3B SCL (OTP) SDA INTR 2 Rev. 1.2