SI5351C-B09809-GM datasheet, PDF

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SI5351C-B09809-GM: DescriptionClock generators and supporting products I2C Prog, Any Frequency, Any Output, Ref Clock Input, 8-Output LVCMOS Clock Gen; Categorysemiconductor The clock and timer IC The clock generator and supporting products; File Size837KB，42 Pages; ManufacturerSilicon Labs; Websitehttps://www.silabs.com

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SI5351C-B09809-GM Overview

Clock generators and supporting products I2C Prog, Any Frequency, Any Output, Ref Clock Input, 8-Output LVCMOS Clock Gen

SI5351C-B09809-GM Parametric

Parameter Name	Attribute value
Maker	Silicon Labs
Product Category	Clock generators and supporting products
series	Si5351

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Si5351A/B/C-B

C - P

R O G RA M M A BL E

N Y

-F

RE Q U E N C Y

C M O S C

L O C K

ENERATOR

+ VCXO

Features



www.silabs.com/custom-timing



Generates up to 8 non-integer-related

frequencies from 2.5 kHz to 200 MHz



C user definable configuration

Exact frequency synthesis at each output



(0 ppm error)

Highly linear VCXO



Optional clock input (CLKIN)

Low output period jitter: < 70 ps pp, typ



Configurable spread spectrum selectable



at each output

Operates from a low-cost, fixed frequency



crystal: 25 or 27 MHz



Supports static phase offset

Programmable rise/fall time control

Glitchless frequency changes

Separate voltage supply pins provide

level translation:



Core VDD: 2.5 or 3.3 V



Output VDDO: 1.8, 2.5, or 3.3 V

Excellent PSRR eliminates external

power supply filtering

Very low power consumption

Adjustable output delay

Available in 2 packages types:

10-MSOP: 3 outputs

20-QFN (4x4 mm): 8 outputs

PCIE Gen 1 compatible

Supports HCSL compatible swing

10-MSOP

20-QFN

Applications



Ordering Information:

See page 29

HDTV, DVD/Blu-ray, set-top box



Audio/video equipment, gaming



Printers, scanners, projectors



Handheld Instrumentation



Residential gateways



Networking/communication



Servers, storage



XO replacement

Description

The Si5351 is an I

C configurable clock generator that is ideally suited for replacing

crystals, crystal oscillators, VCXOs, phase-locked loops (PLLs), and fanout buffers in

cost-sensitive applications. Based on a PLL/VCXO + high resolution MultiSynth fractional

divider architecture, the Si5351 can generate any frequency up to 200 MHz on each of its

outputs with 0 ppm error. Three versions of the Si5351 are available to meet a wide

variety of applications. The Si5351A generates up to 8 free-running clocks using an

internal oscillator for replacing crystals and crystal oscillators. The Si5351B adds an

internal VCXO and provides the flexibility to replace both free-running clocks and

synchronous clocks. It eliminates the need for higher cost, custom pullable crystals while

providing reliable operation over a wide tuning range. The Si5351C offers the same

flexibility but synchronizes to an external reference clock (CLKIN).

Functional Block Diagram

Si5351B (20-QFN)

OSC

VCXO

PLL

MultiSynth

VDDOA

CLK0

CLK1

VDDOB

CLK2

CLK3

VDDOC

CLK4

CLK5

VDDOD

CLK6

CLK7

SDA

SCL

INTR

OEB

Control

Logic

CLKIN

OSC

Si5351C (20-QFN)

PLL

MultiSynth

VDDOA

CLK0

CLK1

VDDOB

CLK2

CLK3

VDDOC

CLK4

CLK5

VDDOD

CLK6

CLK7

SDA

SCL

OEB

SSEN

Control

Logic

Rev. 1.1 9/18

Si5351A/B/C-B

Si5351A/B/C-B

ABLE O F

ONTENTS

Section

Page

1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2. Detailed Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.1. Input Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.2. Synthesis Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.3. Output Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

3.4. Spread Spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.5. Control Pins (OEB, SSEN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4. I2C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5. Configuring the Si5351 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.1. Writing a Custom Configuration to RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2. Si5351 Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.3. Replacing Crystals and Crystal Oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.4. Replacing Crystals, Crystal Oscillators, and VCXOs . . . . . . . . . . . . . . . . . . . . . . . .20

5.5. Replacing Crystals, Crystal Oscillators, and PLLs . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.6. Applying a Reference Clock at XTAL Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.7. HCSL Compatible Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6. Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

6.1. Power Supply Decoupling/Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.2. Power Supply Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.3. External Crystal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

6.4. External Crystal Load Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.5. Unused Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

6.6. Trace Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7. Register Map Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

8. Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

9. Si5351 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

9.1. Si5351A 20-pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

9.2. Si5351B 20-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

9.3. Si5351C 20-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

9.4. Si5351A 10-Pin MSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

10. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

11. Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

11.1. 20-pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

12. Land Pattern: 20-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

12.1. 10-Pin MSOP Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

13. Land Pattern: 10-Pin MSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

14. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

14.1. 20-Pin QFN Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

14.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

14.3. 10-Pin MSOP Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Rev. 1.1

SI5351C-B09809-GM Related Products

	SI5351C-B09809-GM	SI5351C-B02962-GMR	SI5351C-B09486-GMR	SI5351C-B09138-GMR	SI5351A-B09155-GT
Description	Clock generators and supporting products I2C Prog, Any Frequency, Any Output, Ref Clock Input, 8-Output LVCMOS Clock Gen	Clock generators and supporting products I2C Prog, Any Frequency, Any Output, Ref Clock Input, 8-Output LVCMOS Clock Gen	Clock generators and supporting products I2C Prog, Any Frequency, Any Output, Ref Clock Input, 8-Output LVCMOS Clock Gen	Clock generators and supporting products I2C Prog, Any Frequency, Any Output, Ref Clock Input, 8-Output LVCMOS Clock Gen	Clock generators and supporting products I2C Prog, Any Frequency, Any Output, Xtal Ref, 3-Output LVCMOS Clock Gen
Maker	Silicon Labs	Silicon Labs	Silicon Labs	Silicon Labs	Silicon Labs
Product Category	Clock generators and supporting products	Clock generators and supporting products	Clock generators and supporting products	Clock generators and supporting products	Clock generators and supporting products
series	Si5351	Si5351	Si5351	Si5351	Si5351
type	-	Programmable Clock Generators	Programmable Clock Generators	Programmable Clock Generators	-
Maximum input frequency	-	27 MHz	100 MHz	100 MHz	-
Maximum output frequency	-	200 MHz	200 MHz	200 MHz	-
Number of outputs	-	8 Output	8 Output	8 Output	-
Duty Cycle - Max	-	60 %	60 %	60 %	-
Working power voltage	-	2.5 V, 3.3 V	2.5 V/3.3 V	2.5 V/3.3 V	-
Working power current	-	27 mA	27 mA	27 mA	-
Minimum operating temperature	-	- 40 C	- 40 C	- 40 C	-
Maximum operating temperature	-	+ 85 C	+ 85 C	+ 85 C	-
Installation style	-	SMD/SMT	SMD/SMT	SMD/SMT	-
Package/box	-	QFN-20	QFN-20	QFN-20	-
Output type	-	CMOS	CMOS	CMOS	-
product	-	Clock Generators	Clocks	Clocks	-
beat	-	70 ps	70 ps	70 ps	-
Supply voltage - max.	-	3.6 V	3.6 V	3.6 V	-
Supply voltage - min.	-	2.25 V	2.25 V	2.25 V	-
Encapsulation	-	-	Reel	Reel	Tube

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