CY2545_11 Datasheet, PDF (1/17 Pages) Cypress Semiconductor – Quad PLL Programmable Spread Spectrum Clock Generator with Serial I2C Interface

CY2545, CY2547
Quad PLL Programmable
Spread Spectrum Clock Generator
with Serial I²C Interface
Features
■ Four 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
■ Serial programmable over 2-wire I²C interface
■ Programmable spread spectrum with center and down spread
option and Lexmark and Linear modulation profiles
■ V_DD supply voltage options:
❐ 2.5 V, 3.0 V, and 3.3 V for CY2545
❐ 1.8 V for CY2547
■ Selectable output clock voltages independent of V_DD supply:
❐ 2.5 V, 3.0 V, and 3.3 V for CY2545
❐ 1.8 V for CY2547
■ Power-down, output enable, or frequency select features
■ Low jitter, high accuracy outputs
■ Ability to synthesize nonstandard frequencies with Fractional-N
capability
Logic Block Diagram
■ Up to eight clock outputs with programmable drive strength
■ Glitch-free outputs while frequency switching
■ 24-pin QFN package
■ Commercial and industrial temperature ranges
Benefits
■ Multiple high performance PLLs allow synthesis of unrelated
frequencies
■ Nonvolatile programming for personalization of PLL
frequencies, spread spectrum characteristics, drive strength,
crystal load capacitance, and output frequencies
■ Application specific programmable EMI reduction using Spread
Spectrum for clocks
■ Programmable PLLs for system frequency margin tests
■ Meets critical timing requirements in complex system designs
■ Suitability for PC, consumer, portable, and networking applica-
tions
■ Capable of zero PPM frequency synthesis error
■ Uninterrupted system operation during clock frequency switch
■ Application compatibility in standard and low power systems
CLKIN/RST
XIN/
EXCLKIN
XOUT
OSC
FS
MUX
and
Control
Logic
PLL1
PLL2
PLL3
(SS)
Crossbar
Switch
Bank
Output ¹
Dividers
and
Drive ^Bank
2
Strength
Control
Bank
3
CLK1
CLK 2
CLK3
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. *C
• San Jose, CA 95134-1709 • 408-943-2600
Revised July 5, 2011
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