PRELIMINARY
Three PLL Programmable Clock Generator
with Spread Spectrum
CY25403
CY25423
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose
, CA 95134-1709
•
408-943-2600
Document #: 001-12564 Rev. *A
Revised March 02, 2007
Features
• Three fully integrated phase-locked loops (PLLs)
• Input Frequency range:
— External crystal: 8 to 48 MHz
— External reference: 8 to 166 MHz clock
• Wide operating output frequency range
— 3 to 166 MHz
• Programmable Spread Spectrum modulation frequency
range of 30 to 120 kHz with Lexmark profile
• Center Spread: ±0.125% to ±2.5%
• Down Spread: –0.25% to –5%
• Frequency select feature with option to select four different
frequencies
• Low-jitter, high-accuracy outputs
• Up to three clock outputs
• Programmable output drive strength
• Glitch-free outputs while frequency switching
• Four independent output voltages: 3.3V, 3.0V, 2.5V, and
1.8V
• 8-pin SOIC package
• Commercial and Industrial temperature range
Benefits
• Multiple high-performance PLLs allow synthesis of
unrelated frequencies
• Nonvolatile programming for customized PLL frequencies,
spread spectrum characteristics, drive strength, crystal load
capacitance, and output frequencies
• Two Spread Spectrum capable PLLs with Lexmark profile
for maximum for EMI reduction
• Spread Spectrum PLLs can be disabled or enabled
separately
• PLLs can be programmed for system frequency margin
tests
• Meets critical timing requirements in complex system
designs
• Suitable for PC, consumer, and networking applications
• Ability to synthesize standard frequencies with ease
• Application compatibility in standard and low-power
systems
Block Diagram
OSC
MUX
and
Control
Logic
PLL1
PLL2
(SS)
PLL3
(SS)
Output
Dividers
and
Drive
Strength
Control
CLK3
CLK2
CLK1
FS1
FS0
SSON
XOUT
XIN
3 of 4
Crossbar
Switch
PD#/OE
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