Si5332-AM1/2/3 Automotive Grade Device

Reference Manual

The Si5332-AM1/2/3 is a family of high-performance, low-jitter clock generators capable

of synthesizing five independent banks of user-programmable clock frequencies up to

333.33 MHz, while providing up to 12 differential or 24 single-ended output clocks. The

Si5332 supports free run operation using an external crystal as well as lock to an exter-

nal clock signal. The output drivers are configurable to support common signal formats,

such as LVPECL, LVDS, HCSL, and LVCMOS. Separate output supply pins allow supply

voltages of 3.3 V, 2.5 V, 1.8 V and 1.5 V (CMOS only) to power the multi-format output

drivers. The core voltage supply (VDD) accepts 3.3 V, 2.5 V, or 1.8 V and is independent

from the output supplies (VDDOs). Using its two-stage synthesis architecture and paten-

ted high-resolution Multisynth technology, the Si5332 can generate three fully independ-

ent/non-harmonically-related bank frequencies from a single input frequency.

÷ P

PFD LF

÷M

÷R

÷N

÷O

1-31

10-255

10-50 MHz

2.375-2.625 GHz

10-255

8-255

10-250 MHz

10-312.5 MHz

1-63

10-50 MHz

10-250 MHz

10-30 MHz

VDD_XTAL

VDDA

VDDOA

VDDOB

VDDOC

VDDOD

VDDOE

XA/CLKIN_1

CLKIN_2

nCLKIN_2

CLKIN_3

nCLKIN_3

OUT0

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

OUT8

OUT9

OUT10

OUT11

RELATED DOCUMENTS

• Any-Frequency 6/8/12-output

programmable clock generators

• Offered in three different package sizes,

supporting different combinations of output

clocks and user configurable hardware

input pins

•

32-pin QFN, up to 6 outputs

• 40-pin QFN, up to 8 outputs

• 48-pin QFN, up to 12 outputs

• Multisynth technology enables any

frequency synthesis on any output up to

250 MHz using N dividers.

• Output frequencies up to 333.33 MHz

using O dividers.

• Highly configurable output path featuring a

cross point mux

• Up to three independent fractional

synthesis output paths

• Up to five independent integer dividers

• Down and center spread spectrum

• Input frequency range:

• External crystal: 16 MHz to 50 MHz

• Differential clock: 10 MHz to 250 MHz

• LVCMOS clock: 10 MHz to 170 MHz

• Output frequency range:

• Differential: 5 MHz to 333.33 MHz

• LVCMOS: 5 MHz to 170 MHz

• User-configurable clock output signal

format per output: LVDS, LVPECL, HCSL,

LVCMOS

• Easy device configuration using our

ClockBuilder Pro™ (CBPro™) software

tool available for download from our web

site

• Temperature range: –40 to +105 °C

• Pb-free, RoHS-6 compliant

• For more information, refer to the Si5332

Automotive Grade Data Sheet

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Table of Contents

1. Overview .................................

2. Power Supply Sequencing ..........................4

3. Input Clocks................................5

3.1 Input Clock Terminations ..........................5

3.1.1 External Crystal ............................5

3.1.2 External Input Clock on XA Input ......................5

3.1.3 External Input Clock on CLKIN_x/CLKIN_x# ..................6

3.2 Calculating Crystal Loading Capacitance .....................8

4. GPIO .................................10

5. Output Clock Terminations .........................11

5.1 DC-Coupled Output Clock Terminations .....................12

5.2 AC-Coupled Output Clock Terminations .....................16

6. Programming the Volatile Memory (Registers) ..................17

6.1 Programming the PLL ...........................18

6.2 Programming the Clock Path .........................21

6.3 Programming the Output Clock Frequency ....................23

6.4 Programming the Output Clock Format ......................25

6.5 Programming for Frequency Select Operations ...................27

6.6 Programming Spread Spectrum ........................28

7. Si5332 Pinout and Package Variant ......................30

8. Recommended Schematic and Layout Practices .................32

9. Si5332 Common Registers .........................33

10. Si5332 32-QFN Specific Registers ......................43

11. Si5332 40-QFN Specific Registers ......................48

12. Si5332 48-QFN Specific Registers ......................54

13. Revision History............................. 63

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