PCS3P25811_1 ONSEMI [ON Semiconductor], PCS3P25811_1 Datasheet

PCS3P25811_1

Manufacturer Part Number

PCS3P25811_1

Description

Spread Spectrum Clock Generator

Manufacturer

ONSEMI [ON Semiconductor]

Datasheet

1.PCS3P25811_1.pdf (9 pages)

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Features

Product Description

The

spectrum frequency modulators designed specifically for

a wide range of input clock frequencies from 4MHz to

32MHz.

The

interference (EMI) at the clock source, allowing system

wide reduction of EMI of down stream clock and data

NOVEMBER 2010 – Rev. 1.1

Generates a 1x (PCS3P25811), 2x (PCS3P25812)

and 4x(PCS3P25814) low EMI spread spectrum

clock of the input frequency

Provides up to 15dB of EMI suppression

Input Frequency: 4MHz - 32MHz

Output Frequency:

Selectable spread options: Down Spread and Center

Spread

Low Power Dissipation:

Low inherent Cycle-to-Cycle Jitter

Supply Voltage: 2.8V to 3.6V

LVCMOS Input and output

Functional and Pinout compatible to Cypress

CY25811, CY25812 and CY25814

8-pin SOIC, and 8L 2mmX2mm WDFN (TDFN)

Packages

PCS3P25811/12/14 devices are versatile spread

PCS3P25811/12/14

PCS3P25811: 4MHz - 32MHz

PCS3P25812: 8MHz - 64MHz

PCS3P25814: 16MHz - 128MHz

3.3V: 20mW (typ) @ 6MHz

3.3V: 24mW (typ) @ 12MHz

3.3V: 30mW (typ) @ 24MHz

reduce

electromagnetic

PCS3P25811 and PCS3P25812 and PCS3P25814

Spread Spectrum Clock

dependent signals. It allows significant system cost

savings by reducing the number of circuit board layers,

ferrite beads, shielding, and other passive components

that are traditionally required to pass EMI regulations.

The PCS3P25811/12/14 can generate an EMI reduced

clock from crystal, ceramic resonator, or system clock.

The PCS3P25811/12/14 modulate the output of a single

PLL in order to “spread” the bandwidth of a synthesized

cock, and more importantly, decreases the peak

amplitudes of its harmonics. This results in significantly

lower system EMI compared to the typical narrow band

signal produced by oscillators and most frequency

generators. Lowering EMI by increasing a signal’s

bandwidth is called ‘spread spectrum clock generation.’

The PCS3P25811/12/14 use the most efficient and

optimized modulation profile approved by the FCC and is

implemented in a proprietary all-digital method.

The PCS3P25811/12/14 have 2 pins S0 and S1 to control

the selection of Center Spread, Down Spread and No-

Spread functions. Additionally there is a 3 level logic

contol FSEL, for selecting one of the three different

frequency ranges within the operating frequency range.

Refer Input/Output Frequency Range Selection Table.

The PCS3P25811/12/14 operate from a 2.8V to 3.6V

supply and are available in 8 pin SOIC, and 8L

2mmX2mm WDFN packages.

Applications

The PCS3P25811/12/14 are targeted towards EMI

management in applications such as LCD Panels, MFPs,

Digital copiers, Networking, PC peripheral devices,

consumer electronics, and embedded controller systems.

Publication Order Number:

Generator

PCS3P25811/D

Related parts for PCS3P25811_1

PCS3P25811_1 Summary of contents

Page 1

Features Generates a 1x (PCS3P25811), 2x (PCS3P25812) and 4x(PCS3P25814) low EMI spread spectrum clock of the input frequency Provides up to 15dB of EMI suppression Input Frequency: 4MHz - 32MHz Output Frequency: PCS3P25811: 4MHz - 32MHz PCS3P25812: 8MHz - 64MHz ...

Page 2

Block Diagram XIN / CLKIN Crystal Oscillator XOUT Pin Configuration Pin Description Pin# Pin Name Type 1 XIN / CLKIN 2 VSS ModOUT O 6 FSEL 7 VDD P 8 XOUT O PCS3P25811 and ...

Page 3

Input/Output Frequency Range Selection Table PCS3P25811 FSEL (pin 6) (1x) Input (MHz) 0 4-8 1 8-16 M 16-32 Output Frequency Deviation Selection Table S1=0 CLKIN S0=0 S0=M FSEL (MHz) Center Center 4-5 0 ±1.4 5-6 0 ±1.3 6-7 0 ±1.2 ...

Page 4

Operating Conditions Symbol VDD Voltage on any pin with respect to VSS T Operating temperature A C Load Capacitance L C Input Capacitance IN Absolute Maximum Ratings Symbol Voltage on any pin with respect to Ground DD ...

Page 5

AC Electrical Characteristics Symbol Parameter f Input Clock frequency for PCS3P25811/12/14 IN ModOUT Clock frequency for PCS3P25811 f ModOUT Clock frequency for PCS3P25812 OUT ModOUT Clock frequency for PCS3P25814 ModOUT Rise time (Measured from 20% to ...

Page 6

Application Schematic 12MHz C L VDD Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency Frequency tolerance Operating temperature range Storage temperature Load capacitance Shunt capacitance ESR Note: Note Load Capacitance ...

Page 7

Package Information Symbol θ Note: Controlling dimensions are millimeters. SOIC: 0.074 grams unit weight. PCS3P25811 and PCS3P25812 and PCS3P25814 8-Pin SOIC Package ...

Page 8

PCS3P25811 and PCS3P25812 and PCS3P25814 8L 2mmX2mm WDFN package Dimensions Symbol Inches Min Max A 0.027 0.0315 A3 0.008 BSC b 0.008 0.012 D 0.077 0.080 E 0.077 0.080 e 0.020 BSC 0.020 0.024 L Rev Page 8 ...

Page 9

Ordering Code Part Number Marking PCS3P25811AG08SR CGL P3P25812AG-08SR CIL P3P25814AG-08SR CKL P3P25811AG-08CR CG P3P25812AG-08CR CI P3P25814AG-08CR CK A “microdot” placed at the end of last row of marking or just below the last row toward the center of package indicates ...

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