Rev 1.0, August 7, 2008

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2200 Laurelwood Road, Santa Clara, CA 95054 Tel: (408) 855-0555 Fax: (408) 855-0550 www.SpectraLinear.com

SL15316

Programmable Spread Spectrum Clock Generator (SSCG)

Key Features

• Low power dissipation

- 9.0mA-typ at 66MHz and VDD=3.3V

- 8.0mA-typ at 66MHz and VDD=2.5V

• Wide 3.3V to 2.5V power supply range

• Programmable 5 outputs from 3 to 200MHz

• VDDO power suplly for 3 outputs from 3.3 to

2.5V or 1.8V

• Low Jitter

• Programmable Center or Down Spread Modulation

from 0.25 to 5.0%

• 8 to 48 MHz external crystal range

• 3 to 166 MHz external clock range

• Integrated internal voltage regulator

• Programmable PD#/OE/SSON#/FS functions

• Programmable CL at XIN and XOUT pins

• Programmable output rise and fall times

• Programmable modulation frequency from 25 to

120 kHz

Applications

• Printers, MFPs

• Digital Copiers

• NBPCs and LCD Monitors

• Routers, Servers and Switches

• HDTV and DVD-R/W

Description

The SL15316 a programmable Ultra low Power Spread

Spectrum Clock Generator (SSCG) used for reducing

Electromagnetic Interference (EMI).

The product is designed using SpectraLinear proprietary

programmable phase-locked loop (PLL) and Spread

Spectrum Clock (SSC) technology to synthesize and

modulate the input clock. The modulated clock can

significantly reduce the measured EMI levels, and leading

to the compliance with regulatory agency requirements.

Up to 5 output clock frequencies, Spread %, output rise

and fall times, crystal load, modulation frequency and

PD#/OE/SSON#/FS functions can be programmed to meet

the needs of wide range of applications.

The SL15316 operates from 2.5V to 3.3V power supply

voltage range. Separate VDDO power supply is provided

for three (3) clock outputs which can be any value from

3.3V to 2.5V or 1.8V where VDDO≤VDD.

The product is offered in 16-pin TSSOP package with

commercial and industrial grades.

Benefits

• Peak EMI reduction of 6 to 16 dB

• Fast time-to-market

• Cost Reduction

• Reduction of PCB layers

• Eleminates the need for higher order crystals (Xtals)

and crystal oscillators (XOs)

Block Diagram