PI6C3421A Datasheet, PDF (1/7 Pages) Pericom Semiconductor Corporation – 27MHz Spread Spectrum Clock Synthesizer

Product Features
• 14.318 MHz input frequency, (crystal or external reference)
• Two High Precision outputs:
—27.000 MHz SSC clock output
—27.000 MHz clock output
• Four Down-Spread options:
— Down-spread: -0.25%, -0.5%, -0.75% and -1.0% typical at
14.318MHz input
• Single 3.3V Power Supply
• Modulation Rate: Fin /448
• Industrial and commercial temperature supported
• Packaging ( Pb-Free and Green):
— SOTiny™ 6-pin SOT-23 (T)
Applications
The PI6C3421A can be used in most multimedia applica-
tions 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
PI6C3421A
27MHz Spread Spectrum
Clock Synthesizer
Description
The PI6C3421A is a Spread Spectrum Clock Synthesizer and
part of the Pericom SSCG product family. The part generates
one high precision 27.000 MHz spread spectrum clock
output from a single clock source or a crystal and one 27.000
MHz un-modulated clock output, 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
PI6C3421A provides -0.25%, -0.5%, -0.75% and -1.0% spread
modulation through external logic stage setting. The variety and
the reduced size of the package outlines can save precious board
space and make layout easier.
PI6C3421A 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.
Benefits
• Reduction in EMI
• System cost saving
• Reduced system complexity
• Faster time to market
Block Diagram
Pin Configuration
REFIN/X1
X2
S0
S1
Clock
Synthesizer
27M
27M_SSC
X1/REFIN
GND
27M_SSC/S0
6-Pin
SOT-23
X2/S1
V_DD
27M
07-0120
PS8836E
05/22/07
1