ICS149317 ICST [Integrated Circuit Systems], ICS149317 Datasheet

ICS149317

Manufacturer Part Number

ICS149317

Description

Clock Synthesizer for Portable Systems

Manufacturer

ICST [Integrated Circuit Systems]

Datasheet

1.ICS149317.pdf (11 pages)

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MDS 1493-17 A

Integrated Circuit Systems

Description

The ICS1493-17 is a low-power, low-jitter clock

synthesizer designed to replace multiple crystals and

oscillators in portable audio/video systems. The device

generates a 37 MHz processor clock, a 48 MHz USB

clock, a fixed 22.5792 MHz audio clock, a selectable

24.576 MHz or 22.5792 MHz audio clock, and a 27MHz

reference clock for video. Using ICS’ proprietary mix of

analog and digital Phase-Locked Loop (PLL)

technology, the device spreads the frequency spectrum

of the 37 MHz output, reducing the peak amplitude of

by up to 16 dB. An output enable (OE) pin lowers the

chip power consumption while tri-stating all outputs.

Block Diagram

27 MHz

clock or

crystal input

SDATA

Optional tuning

capacitors

SCK

P R E L I M I N A R Y I N F O R M A T I O N

Oscillator/

Crystal

Buffer

Clock

●

Control

Logic

5 25 Race Street, San Jo se, CA 9 512 6

IIC

(Spread)

PLL1

PLL2

PLL3

PLL4

Clock Synthesizer for Portable Systems

Features

•

GND

VDD

Extremely low operating current (11 mA)

Packaged in 20-pin QFN (Pb-free)

Input crystal or clock frequency of 27 MHz

Output reference frequency of 27 MHz

Fixed output frequencies of 37 MHz, 48 MHz and

22.5792 MHz

Selectable output frequency of either 22.5792 MHz

or 24.576 MHz

Configurable spread spectrum on 37 MHz output

Operating core voltage of 1.8 V

Output voltage of 1.8 V or 2.5 V

Advanced, low-power CMOS process

●

tel (40 8) 2 97-12 01

VDDO

ICS1493-17

●

w w w. i c st . c o m

Revision 101005

37M

48M

22/24M

22M

27M

Related parts for ICS149317

ICS149317 Summary of contents

Page 1

Description The ICS1493- low-power, low-jitter clock synthesizer designed to replace multiple crystals and oscillators in portable ...

Page 2

Pin Assignment 16 GND 1 48M VDDO OE VDD 11 6 20-pin QFN Pin Descriptions Pin Pin Number ...

Page 3

Pin Pin Number Name 18 VDD External Components Decoupling Capacitor As with any ...

Page 4

Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS1493-17. These ratings, ...

Page 5

Parameter Internal Pull-down Resistor Internal Pull-up Resistor AC Electrical Characteristics Unless stated otherwise, VDDO = 2.5 V ±5%, ...

Page 6

Electrical Characteristics Unless stated otherwise, VDDO = 1.8 V ±0.1 V, Ambient Temperature -10°C to +80°C Parameter ...

Page 7

Serial Data Interface Data Protocol The clock driver serial protocol accepts byte write, byte read, block write, and ...

Page 8

Byte Write Protocol Bit Description 1 Start 2:8 Slave address - 7 bits 9 Write = 0 ...

Page 9

Byte 1: Control Register Bit @Pup ...

Page 10

Thermal Characteristics Parameter Thermal Resistance Junction to Ambient Marking Diagram 16 1 93K17L ###### YYWW 11 6 Notes: ...

Page 11

Package Outline and Package Dimensions Package dimensions are kept current with JEDEC Publication No. 95 Seating Plane Index ...

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