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
PCIe Gen 1/2/3/4 Common Clock and glitchless frequency adjustments in
Gen 3 SRNS compliant 1 ppm steps
Highly-configurable output drivers with Independent phase adjustment on
up to four differential outputs, eight each of the output drivers with an
single-ended clock outputs, or a accuracy of <20 ps steps
Ordering Information:
combination of both
Highly configurable spread
Low phase jitter of 0.7 ps RMS typ spectrum (SSC) on any output: See page 42.
High precision synthesis allows true Any frequency from 5 to 350 MHz
Any spread from 0.5 to 5.0%
zero ppm frequency accuracy on all
Any modulation rate from 33 to
outputs
Pin Assignments
63 kHz
Flexible input reference:
External feedback mode allows
External crystal: 8 to 30 MHz
zero-delay mode
CMOS input: 5 to 200 MHz
Top View
Loss of lock and loss of signal
SSTL/HSTL input: 5 to 350 MHz
alarms
Differential input: 5 to 710 MHz
2
Independently configurable outputs
I C/SMBus compatible interface
support any frequency or format:
24 23 22 21 20 19
Easy to use programming software
LVPECL/LVDS: 0.16 to 710 MHz IN1 1 18
CLK1A
Small size: 4 x 4 mm, 24-QFN
HCSL: 0.16 to 250 MHz
Low power: 45 mA core supply typ
2 17
IN2 CLK1B
CMOS: 0.16 to 200 MHz
Wide temperature range: 40 to
SSTL/HSTL: 0.16 to 350 MHz 3 16
IN3 VDDO1
GND
+85 C
GND
Independent output voltage per driver:
Pad
IN4 4 15
VDDO2
1.5, 1.8, 2.5, or 3.3 V
5 14
IN5 CLK2A
Applications
6 13
IN6 CLK2B
7 8 9 10 11 12
Ethernet switch/router Any-frequency clock conversion
PCIe Gen1/2/3/4 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. Measuring PCIe
clock jitter is quick and easy with the Silicon Labs PCIe Clock Jitter Tool.
Download it for free at www.silabs.com/pcie-learningcenter.
Rev. 1.6 12/15 Copyright 2015 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. 1.6