ICST AV9117M-01, ICS9117M-01 Datasheet

Integrated Circuit Systems, Inc.

General Description

Features

XTAL OSC

PCLK

UCLK

MCLK

PLL

CLOCK

GEN

÷8

14.7456 MHz

•

Generates the 14.7456 MHz microcontroller, 40.320 MHz datadump and 1.84320 UART clocks

• Less than ±80 ppm frequency variation including

temperature, voltage, load and aging tolerances

• Single crystal reference minimizes crystal reliability

and inventory issues

• 80 ps one sigma jitter maintains 16-bit performance

• Output rise/fall times less than 1.5 ns

• On-chip loop filter components

• 3.0 V - 5.5 V supply range

• 8-pin, 150-mil SOIC package

Applications

• Specifically designed to support the high performance

of fax/data modems

9117-01 RevA 052297P

Pentium is a trademark of Intel Corporation PowerPC is a trademark of Motorola Corporation

Frequency Generator for Modem Systems

ICS9117-01

The ICS9117-01 is a low-cost, high-performance frequency generator designed to support fax/data modem systems. Datapump and UART clocks are synthesized from a microcontroller crystal using high-accuracy, low-jitter PLLs, meeting the frequency tolerance and -96dB signal-to-noise ratios required by 16-bit DSP modem systems. Fast output clock edge rates minimize boar d induced jitter.

Exact frequency multiplying ratios ensure better than ±80 ppm frequency accuracy using a standard AT crystal with external load capacitors (typically 33pF ±5% for an 18pF series load crystal). Achieving ±80ppm over four years requires the crystal to have 20 ppm initial accuracy , ±20 ppm temperature and ±5 ppm/year aging coefficients.

Block Diagram

PRODUCT PREVIEW documents contain information on products in the formative or design phase development. Charactersitic data and other specifications are design goals. ICS reserves the right to change or discontinue these procucts without notice.

ICS9117-01

Pin Configuration

Pin Descriptions

Functionality

X1, X2 (MHz)

PD PCLK

(MHz)

MCL K (MHz)

UCLK (MHz)

14.7456 0 14.7456 40.320 1.8432

14. 7 45 6 1 L ow Low Low

PIN NU MBE R PIN NA ME TYP E DES CRI PT ION

1 X2 OUT Drive to crystal. 2 X1 IN Crystal or clock input. 3 GND PWR P ower s upp ly gr ound .

4 PD IN Power-down signal. Power-down all loops and oscilla tors. 5 MCLK OUT Dat ap ump 40 .32 MHz cl ock outp ut. 6 VDD PWR + 5V powe rs upp ly 7 UCLK OUT UART 1.84 MHz data cloc k output. 8 PCLK OUT Microcontroller 14.7 MHz clock output.

8-PIN SOIC

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