291PGLF

更新时间： 2024-01-04 19:42:28

品牌	Logo	应用领域
艾迪悌 - IDT		时钟
页数	文件大小	规格书
10页	222K
描述
TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER

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291PGLF 数据手册

DATASHEET

TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER ICS291

Description

Features

The ICS291 field programmable spread spectrum clock

synthesizer generates up to six high-quality, high-frequency

clock outputs including multiple reference clocks from a

low-frequency crystal input. It is designed to replace

crystals, crystal oscillators and stand alone spread

spectrum devices in most electronic systems.

• Packaged as 20-pin TSSOP – Pb-free, RoHS compliant

• Eight addressable registers

• Replaces multiple crystals and oscillators

• Output frequencies up to 200 MHz at 3.3 V

• Configurable Spread Spectrum Modulation

• Input crystal frequency of 5 to 27 MHz

• Clock input frequency of 3 to 166 MHz

• Up to six reference outputs

Using IDT’s VersaClock software to configure PLLs and

outputs, the ICS291 contains a One-Time Programmable

(OTP) ROM for field programmability. Programming

features include input/output frequencies, spread spectrum

amount, eight selectable configuration registers and up to

two sets of three low-skew outputs.

• Separate 1.8 to 3.3 V VDDO output level controls for

each bank of 3 outputs

• Up to two sets of three low-skew outputs

• Operating voltages of 3.3 V

• Controllable output drive levels

• Advanced, low-power CMOS process

Each of the two output groups are powered by a separate

VDDO voltage. VDDO may vary from 1.8 V to VDD.

Using Phase-Locked Loop (PLL) techniques, the device

runs from a standard fundamental mode, inexpensive

crystal, or clock. It can replace multiple crystals and

oscillators, saving board space and cost.

The ICS291 is also available in factory programmed custom

versions for high-volume applications.

Block Diagram

VDDO1

VDD

PLL1 with

Spread

Spectrum

S2:S0

OTP

CLK1

CLK2

CLK3

ROM

with PLL

Values

Divide

Logic

and

Output

Enable

Control

PLL2

PLL3

CLK4

CLK5

CLK6

X1/ICLK

Crystal

Oscillator

Crystal or

Clock Input

External capacitors

are required with a crystal input.

GND

VDDO2

PDTS

IDT™ / ICS™ TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 1

ICS291

REV F 051310

12 3 4 5 6 7...10

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