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CY25100_08

产品描述Field and Factory-Programmable Spread Spectrum Clock Generator for EMI Reduction
文件大小299KB,共13页
制造商Cypress(赛普拉斯)
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CY25100_08概述

Field and Factory-Programmable Spread Spectrum Clock Generator for EMI Reduction

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CY25100
Field and Factory-Programmable Spread Spectrum
Clock Generator for EMI Reduction
Features
Benefits
Wide operating output (SSCLK) frequency range
3 MHz to 200 MHz
Programmable spread spectrum with nominal 31.5 kHz
modulation frequency
Center spread: ±0.25% to ±2.5%
Down spread: –0.5% to –5.0%
Input frequency range
External crystal: 8 to 30 MHz fundamental crystals
External reference: 8 to 166 MHz clock
Integrated phase-locked loop (PLL)
Field programmable
CY25100SCF and CY25100SIF, 8-pin SOIC
CY25100ZCF and CY25100ZIF, 8-pin TSSOP
Programmable crystal load capacitor tuning array
Low cycle-to-cycle jitter
3.3V operation
Commercial and industrial operation
Spread spectrum on/off function
Power down or Output Enable function
Services most PC peripherals, networking, and consumer
applications.
Provides wide range of spread percentages for maximum
electromagnetic interference (EMI) reduction, to meet
regulatory agency electromagnetic compliance (EMC) require-
ments. Reduces development and manufacturing costs and
time-to-market.
Eliminates the need for expensive and difficult to use higher
order crystals.
Internal PLL to generate up to 200 MHz output. Able to generate
custom frequencies from an external crystal or a driven source.
In-house programming of samples and prototype quantities is
available using the CY3672 programming kit and
CY3690 (TSSOP) or CY3691 (SOIC) socket adapter.
Production quantities are available through Cypress’s value
added distribution partners or by using third party programmers
from BP Microsystems, HiLo Systems, and others.
Enables fine tuning of output clock frequency by adjusting
C
Load
of the crystal. Eliminates the need for external C
Load
capacitors.
Suitable for most PC, consumer, and networking applications.
Application compatibility in standard and low power systems.
Ability to enable or disable spread spectrum with an external
pin.
Enables low power state or output clocks to High-Z state.
Logic Block Diagram
RFB
3
XIN
C
XIN
PLL
with
MODULATION
CONTROL
6
2
XOUT
C
XOUT
PROGRAMMABLE
CONFIGURATION
OUTPUT
DIVIDERS
and
MUX
REFCLK
7
4
PD# or OE
8
SSON#
1
VDD
5
VSS
SSCLK
Cypress Semiconductor Corporation
Document #: 38-07499 Rev. *F
198 Champion Court
San Jose
,
CA 95134-1709
408-943-2600
Revised November 4, 2008
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