General Description
CY25562 is a spread spectrum clock generator (SSCG) IC used to reduce electromagnetic interference (EMI) found in today’s high speed digital electronic systems.
CY25562 uses a Cypress proprietary Phase Locked Loop (PLL) and Spread Spectrum Clock (SSC) technology to synthesize and frequency modulate the input frequency of the reference clock. By doing this, the measured EMI at the fundamental and harmonic frequencies of clock (SSCLK) is greatly reduced.
This reduction in radiated energy can significantly reduce the cost of complying with regulatory requirements and time to market without degrading system performance.
CY25562 is a very simple and versatile device to use. The frequency and spread percentage range is selected by programming S0 and S1 digital inputs. These inputs use three logic states including high (H), low (L), and middle (M) logic levels to select one of the nine available spread percentage ranges. Refer to Table 1 for programming details.
CY25562 is intended for applications with a reference frequency in the range of 50 to 200 MHz.
A wide range of digitally selectable spread percentages is made possible by using tri-level (high, low, and middle) logic at the S0 and S1 digital control inputs.
The output spread (frequency modulation) is symmetrically centered on the input frequency.
Spread spectrum clock control (SSCC) function enables or disables the frequency spread and is provided for easy comparison of system performance during EMI testing.
CY25562 is available in an eight-pin SOIC package with a 0 to 70°C operating temperature range.
Refer to CY25561 for applications with lower drive requirements, and CY25560 with lower drive and frequency requirements.

Features
*50 to 200 MHz Operating Frequency Range
*Wide range of spread selections: 9
*Accepts Clock and Crystal Inputs
*Low Power Dissipation
-70 mW Typ (Fin = 65 MHz)
*Frequency Spread Disable Function
*Center Spread Modulation
*Low Cycle-to-cycle Jitter
*8-pin SOIC Package

Applications
*High resolution VGA controllers
*LCD panels and monitors
*Workstations and servers

CY25562SXC, CY25562SXCT

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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 signifi cant 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 specifi cation not currently provided, please contact us for further information or custom design.

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 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

PI6C3421ATE, PI6C3421AITE

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Features
* Compliant with Intel® CK-Titan clock synthesizer/driver specifications
* Multiple output clocks at different frequencies
- Three pairs of differential CPU outputs, up to 200 MHz
- Ten synchronous PCI clocks, three free-running
- Six 3V66 clocks
- Two 48-MHz clocks
- One reference clock at 14.318 MHz
- One VCH clock
* Spread Spectrum clocking (down spread)
* Power-down features (PCI_STOP#, CPU_STOP# PWR_DWN#)
* Three Select inputs (Mode select and IC Frequency Select)
* OE and Test Mode support
* 56-pin SSOP package and 56-pin TSSOP package

Benefits
* Supports next-generation Pentium® processors using differential clock drivers
* Motherboard clock generator
- Supports multiple CPUs and a chipset
- Support for PCI slots and chipset
- Supports AGP, DRCG reference, and Hub Link
- Supports USB host controller and graphic controller
- Supports ISA slots and I/O chip
* Enables reduction of electromagnetic interference (EMI) and overall system cost
* Enables ACPI-compliant designs
* Supports up to four CPU clock frequencies
* Enables ATE and “bed of nails” testing
* Widely available standard package enables lower cost

W320-04H
W320-04HT
W320-04X
W320-04XT

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