CY2546FCT datasheet(1/11 Pages) CYPRESS

Part #	CY2546FCT

Description	Quad PLL Programmable Clock Generator with Spread Spectrum

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Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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PRELIMINARY

Quad PLL Programmable Clock Generator with

Spread Spectrum

CY2546

CY2544

Cypress Semiconductor Corporation

•

198 Champion Court

•

San Jose

, CA 95134-1709

•

408-943-2600

Document #: 001-12563 Rev. *A

Revised February 28, 2007

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

• Programmable Spread Spectrum with Center and Down

Spread option and Lexmark modulation profile

• Two VDD core voltage options:

— 2.5V, 3.0V, and 3.3V for CY2544

— 1.8V for CY2546

• Selectable output voltages:

— 2.5V, 3.0V, and 3.3V for CY2544

— 1.8V for CY2546

• Frequency Select feature with option to select eight different

frequencies

• Low jitter, high accuracy outputs

• Up to nine clock outputs

• Programmable output 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 customized PLL frequencies,

spread spectrum characteristics, drive strength, crystal load

capacitance, and output frequencies

• Two Spread Spectrum capable PLLs with Linear or Lexmark

profile for maximum 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

PLL3

(SS)

PLL4

(SS)

Output

Dividers

and

Drive

Strength

Control

CLK1

CLK9

CLK8

CLK7

CLK6

CLK5

CLK4

CLK3

CLK2

4of 6

Crossbar

Switch

EXCLKIN

FS2

FS1

FS0

SSON

XOUT

XIN

PD#/OE

Bank

1

Bank

3

Bank

2

[+] Feedback

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