1

PS8944A

01/30/08

Block Diagram

PI6C3622-1

Low Power Spread Spectrum Frequency Multiplier

SSCG-GP Family

Features

• 20 to 40MHz input frequency range

• 1x frequency multiplication

• Operating voltages of 2.5 V or 3.3V

• Selectable Spreading Ratio: ±0.30%, ±0.50%, ±0.70% and 0%

typical at 27MHz input

• Modulation Rate: Fin /640(20 MHz≤ Fin ≤40 MHz)

• Spread Spectrum feature can be enabled/disabled at run-time

and glitch-free

• Low power dissipation

• Low jitter

• 8-pin TSSOP Package

Applications

The PI6C3622-1 can be used in most multimedia applications

and embedded systems including but not limited to the

following:

PDAs

DSCs

Printers/ MFPs

Media players

Portable-TVs

Embedded digital video devices

CD-ROM, VCD and DVD players

LCD Panel Modules

Automotive components

Networking devices

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Description

The PI6C3622-1 is a Low Power Spread Spectrum Frequency

Multiplier and part of the Pericom SSCG-GP family. The part

generates one 1x modulated output from a single clock source or

a crystal, and is designed to reduce electromagnetic interference

(EMI) by spreading the clock. This reduction in EMI can result

in significant system cost saving and less design complexity

by reducing the number of circuit board layers ferrite beads

and shielding. In the absence of a spread spectrum clock, other

EMI-reducing components are required in order to comply with

regulatory agency requirements.

The Spreading Ratio is selectable using the selection pins. The

PI6C3622-1 provides ±0.30%, ±0.50%, ±0.70% diversified and

0% spread modulation through external logic stage setting. The

Spread Spectrum feature can be enabled and disabled at run-

time by setting the SSON pin. Other pins should be properly set

before the system is initialized.

The chip is packaged in the 8-pin TSSOP. The reduced size of

the package outlines can save precious board space and make

layout easier.

PI6C3622-1 is one of the clock products provided by Pericom.

If your application needs a clock product with a different

specification not currently provided, please contact us for further

information or custom design.

Pin Configuration

S1

S0

SSON

X’TAL

OSC

1/M

PFD

/CP

LPF

VCO

CLKOUT

1/K

Modulation

1/N

X1/CLKIN

X2

Benefits

Reduction in EMI

System cost saving

Reduced system complexity

Faster time to market

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VDD

GND

CLKOUT

X1

/CLKIN

8 Pin

TSSOP

S1

SSON

X2

S0