Si5332-GM1: 6-Output, 32-QFN/LGA
Multi
Synth
INT
Multi
Synth
INT
INT
INT
INT
OUT0
VDDO0
VDDO3
VDDO4
VDDO5
OUT3
OUT4
OUT5b
OUT1
VDDO1
OUT2
VDDO2
OUT0b
OUT3b
OUT4b
OUT5
OUT1b
OUT2b
÷INT
÷INT
÷INT
÷INT
÷INT
÷INT
NVM
I
2
C
HW Input
Control
SCLK
SDATA
Input1
Input2
Input3
Input4
Input5
PLL
CLKIN_2
XTAL
OSC
CLKIN_2b
Si5332A/B/C/D: External Crystal
Si5332E/F/G/H/L: Internal Crystal
÷INT
Figure 3.3. Block Diagram for 6-Output Si5332 in 32-QFN/LGA
The Si5332-GM1 features:
• Up to six differential clock outputs with individual VDDO.
• Five user-configurable HW input pins, defined using ClockBuilder Pro.
3.2 Modes of Operation
The Si5332 supports both free-run and synchronous modes of operation. The default mode selection is set in ClockBuilder Pro.
Alternatively, two universal hardware input pins can be defined as CLKIN_SEL[1:0] to select between a crystal or clock input. There is
also the option to select the input source via the serial interface by writing to the input select register.
3.2.1 Initialization
Once power is applied, the device begins an initialization period where it downloads default register values and configuration data
from NVM and performs other initialization tasks. Communicating with the device through the serial interface is possible once this
initialization period is complete. The clock outputs will be squelched until the device initialization is done.
3.3 Frequency Configuration
The phase-locked loop is fully integrated and does not require external loop filter components. Its function is to phase lock to the
selected input and provide a common synchronous reference to the high-performance MultiSynth fractional or integer dividers.
A cross point mux connects any of the MultiSynth divided frequencies or INT divided frequencies to individual output drivers or banks
of output drivers. Additional output integer dividers provide further frequency division by an even integer from 1 to 63. The frequency
configuration of the device is programmed by setting the input dividers (P), the PLL feedback fractional divider (Mn/Md), the MultiSynth
fractional dividers (Nn/Nd), and the output integer dividers (R). Skyworks’ Clockbuilder Pro configuration utility determines the optimum
divider values for any desired input and output frequency plan.
Si5332 Data Sheet • Functional Description
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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Rev. 1.3 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 16, 2021
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