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CY2545 Datasheet, PDF (1/17 Pages) Cypress Semiconductor – Quad PLL Programmable Spread Spectrum Clock Generator with Serial I2C Interface | |||
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PRELIMINARY
CY2545
CY2547
Quad PLL Programmable Spread Spectrum
Clock Generator with Serial I2C Interface
Features
â Four fully integrated phase locked loops (PLLs)
â Input frequency range
â External crystal: 8 to 48 MHz
â External reference: 8 to 166 MHz clock
â Wide operating output frequency range
â 3 to 166 MHz
â Serial programmable over 2-wire I2C interface
â Programmable Spread Spectrum with Center and Down
Spread option and Lexmark and Linear modulation profiles
â VDD core voltage options:
â 2.5V, 3.0V, and 3.3V for CY2545
â 1.8V for CY2547
â Selectable output clock voltages:
â 2.5V, 3.0V, and 3.3V for CY2545
â 1.8V for CY2547
â Power down, output enable, or frequency select features
â Low jitter, high accuracy outputs
â Ability to synthesize nonstandard frequencies with
Fractional-N capability
â Up to eight clock outputs with Programmable drive strength
â Glitch-free outputs while frequency switching
â 24-pin QFN package
â Commercial and Industrial temperature ranges
Benefits
â Multiple high performance PLLs allow synthesis of unrelated
frequencies
â Nonvolatile programming for personalization of PLL
frequencies, spread spectrum characteristics, drive strength,
crystal load capacitance, and output frequencies
â Application specific programmable EMI reduction using
Spread Spectrum for clocks
â Programmable PLLs for system frequency margin tests
â Meets critical timing requirements in complex system
designs
â Suitability for PC, consumer, portable, and networking appli-
cations
â Capable of Zero PPM frequency synthesis error
â Uninterrupted system operation during clock frequency
switch
â Application compatibility in standard and low power systems
Logic Block Diagram
CLKIN/RST
XIN/
EXCLKIN
XOUT
OSC
FS
MUX
and
Control
Logic
PLL1
PLL2
PLL3
(SS)
4 of 6
Crossbar
Switch
Bank
Output
1
Dividers
and
Drive Bank
2
Strength
Control
Bank
3
CLK 1
CLK 2
CLK 3
CLK 4
CLK 5
CLK 6
CLK 7
CLK 8
SCL
SDA
I2C
SSON
PLL4
(SS)
PD #/ OE
Cypress Semiconductor Corporation ⢠198 Champion Court
Document #: 001-13196 Rev. **
⢠San Jose, CA 95134-1709 ⢠408-943-2600
Revised July 29, 2007
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