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Cypress Semiconductor Electronic Components Datasheet

CY2545 Datasheet

Quad-PLL Programmable Spread Spectrum Clock Generator

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CY2545/CY2547
Quad-PLL Programmable Spread Spectrum
Clock Generator with Serial I2C Interface
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 two-wire I2C interface
Programmable spread spectrum with center and down spread
option and Lexmark and Linear modulation profiles
VDD 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 VDD supply:
1.8 V, 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
Up to eight clock outputs with programmable drive strength
Glitch-free outputs while frequency switching
24-pin QFN package
Commercial and industrial temperature ranges
One-time programmability
For programming support, contact Cypress technical support
or send an e-mail to clocks@cypress.com
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
applications
Capable of zero PPM frequency synthesis error
Uninterrupted system operation during clock frequency switch
Application compatibility in standard and low-power systems
Functional Description
For a complete list of related documentation, click here.
Logic Block Diagram
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
SSON
I2C
PLL4
(SS)
PD#/OE
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 001-13196 Rev. *I
• San Jose, CA 95134-1709 • 408-943-2600
Revised November 2, 2017


Cypress Semiconductor Electronic Components Datasheet

CY2545 Datasheet

Quad-PLL Programmable Spread Spectrum Clock Generator

No Preview Available !

CY2545/CY2547
Contents
Pinouts .............................................................................. 3
Pin Definitions .................................................................. 4
Pinouts .............................................................................. 5
Pin Definitions .................................................................. 6
Functional Overview ........................................................ 7
Four Configurable PLLs .............................................. 7
I2C Programming ........................................................ 7
Input Reference Clocks ............................................... 7
Multiple Power Supplies .............................................. 7
Output Bank Settings .................................................. 7
Output Source Selection ............................................. 7
Spread Spectrum Control ............................................ 7
Frequency Select ........................................................ 7
Glitch-Free Frequency Switch ..................................... 7
Device Reset Function ................................................ 7
PD#/OE Mode ............................................................. 7
Keep Alive Mode ......................................................... 7
Output Drive Strength .................................................. 8
Generic Configuration and Custom Frequency ........... 8
Output Driver Supply
and Multi-Function Input Restriction ................................... 8
Serial I2C Programming Interface
Protocol and Timing ......................................................... 9
Device Address ......................................................... 10
Data Valid .................................................................. 10
Data Frame ............................................................... 10
Acknowledge Pulse ................................................... 10
Write Operations ............................................................. 11
Writing Individual Bytes ............................................. 11
Writing Multiple Bytes ................................................ 11
Read Operations ............................................................. 11
Current Address Read ............................................... 11
Random Read ........................................................... 11
Sequential Read ........................................................ 11
Serial I2C Programming Interface
Timing Specifications .................................................... 11
Absolute Maximum Conditions ..................................... 12
Recommended Operating Conditions .......................... 12
DC Electrical Specifications .......................................... 13
AC Electrical Specifications .......................................... 14
Configuration Example .................................................. 14
Recommended Crystal Specification ........................... 15
Recommended Crystal Specification ........................... 15
Test and Measurement Setup ........................................ 16
Voltage and Timing Definitions ..................................... 16
Ordering Information ...................................................... 17
Possible Configurations ............................................. 17
Ordering Code Definitions ......................................... 17
Package Diagram ............................................................ 18
Acronyms ........................................................................ 19
Document Conventions ................................................. 19
Units of Measure ....................................................... 19
Document History Page ................................................. 20
Sales, Solutions, and Legal Information ...................... 22
Worldwide Sales and Design Support ....................... 22
Products .................................................................... 22
PSoC® Solutions ...................................................... 22
Cypress Developer Community ................................. 22
Technical Support ..................................................... 22
Document Number: 001-13196 Rev. *I
Page 2 of 22


Part Number CY2545
Description Quad-PLL Programmable Spread Spectrum Clock Generator
Maker Cypress
Total Page 22 Pages
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