Si5350/51-B
Factory-Programmable Any-Frequency CMOS Clock Generator
Description
The Si5350/51 family of highly flexible, programmable
clock generators can be customized to generate up to
eight independent non-integer-related frequencies. The
devices have eight CMOS clock outputs offered in a
space saving 4x4 mm 20-QFN or lower cost three clock
output versions offered in a 10-MSOP package. Each
output has an independent MultiSynth™ fractional
divider that accepts a high-frequency reference from
one of the device’s internal PLLs and accurately divides
down the clock to generate unique, non-integer-related
frequencies from 2.5 kHz to 200 MHz. Any combination
of output frequencies can be generated by the device.
All clocks are generated with 0 ppm frequency
synthesis error, enabling the replacement of XOs and
PLL-based clocks while simplifying design and
minimizing cost. As an added feature, the Si5350/51
features an integrated VCXO which eliminates the need
for pullable crystals. The Si5350 features configurable
control pin options allowing the direct pin control of
frequency select, output enable, spread spectrum
enable and powerdown. Each output supports 1.8, 2.5,
or 3.3 V operation, eliminating the need for external
level translators in mixed-supply applications.
Features
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Generates any frequency on any output
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2.5 kHz to 200 MHz
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Exact clock synthesis: 0 ppm error
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Similar frequency flexibility as 8 independent PLLs
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Accepts crystal or external reference clock
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< 70 ps typical period jitter for any configuration
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Glitchless switching between output frequencies
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Integrated VCXO eliminates need for pullable
crystal
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Si5350 (pin) and Si5351 (I
2
C) versions
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User-definable control pins:
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Frequency select, output enable, spread spectrum
enable, powerdown
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Spread spectrum clock generation
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–0.1 to –2.5% down, ±0.1 to ±1.5% center
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Two week sample lead time for any custom clock
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Small size: 4x4 mm 20-QFN and 10-MSOP
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Industrial temperature range: –40 to +85
Applications
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HDTV, DVD/Blu-ray, set-top box
Audio/video equipment, gaming
Printers, scanners, projectors
Audio DAC/CODEC
USB Audio
Residential gateways
Networking/communication
Servers, storage
VDD
MultiSynth
0
MultiSynth
1
MultiSynth
2
MultiSynth
3
20-QFN
VDDOA
R0
R1
R2
R3
R4
R5
R6
R7
CLK0
CLK1
VDDOB
CLK2
CLK3
VDDOC
CLK4
CLK5
VDDOD
CLK6
CLK7
XA
10-MSOP
VDD
VDDO
XB
OSC
PLL
A
XA
OSC
XB
PLL
A
MultiSynth
0
R0
CLK0
PLL
B
PLL
B
P0
P1
Control
Logic
MultiSynth
1
R1
CLK1
P0
P1
MultiSynth
4
Control
Logic
MultiSynth
5
MultiSynth
6
MultiSynth
7
GND
MultiSynth
2
R2
CLK2
P2
P3
GND
P4
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7.15.15
PCB设计
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