Datasheet > MK3230-02STR

MK3230-02STR

更新时间： 2024-11-07 22:30:07

品牌	Logo	应用领域
矽成 - ICSI		晶体外围集成电路光电二极管便携式时钟
页数	文件大小	规格书
4页	71K
描述
Portable System Clock Synthesizer

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MK3230-02STR 数据手册

MK3230

Portable System Clock Synthesizer

_{ICR O}C_{LOC K}

Description

Features

• Packaged in 16 pin narrow (0.150”) SOIC

• Input crystal frequency of 32.768 kHz

• Lowest power solution available

• Lowest profile clock solution where height is critical

• Output clock frequencies up to 80 MHz

• Five output clocks

The MK3230 is the smallest size, lowest power system

clock synthesizer available. It is the ideal way to

generate clocks for portable computers, PDAs, and

other devices where low power is required. Using

analog Phase-Locked Loop (PLL) techniques, the

device operates from a single 32.768 kHz crystal to

produce the 32.768kHz, CPU, system, keyboard

controller, and floppy (or super I/O) controller output

clocks.

• 3.3V or 5.0V operation

• Duty cycle of 45/55

• Seven selectable CPU frequencies

• CPU and peripheral clock power downs

• Separate battery supply pin for 32 kHz

• IDD less than 5µA when 32 kHz running

• Available with either 12MHz (-01) or 16MHz (-02)

keyboard clock output

• 14.3MHz output is not suitable for driving PLL for

CRT. Will drive all other functions

• 32kHz crystals require long startup (>500ms)

The device has two power down modes. From the CPU

decoding table (when FS0, FS1, and FS2 all are low),

the CPU and 14.3 MHz system clocks can be turned

off. Also, the keyboard and 24 MHz peripheral clocks

can be shut off from PD24+KBD (pin 10). The part has

a separate VDD32 pin for the 32 kHz clock, allowing

it to run at a different voltage (down to 2.0V) from the

rest of the chip, allowing it to run from a back-up

battery.

Block Diagram

VDD

GND

Output

CPUCLK

Buffer

CPUS0

CPUS1

CPUS2

Output

12 or 16 MHz

Buffer

Clock Synthesis

and Control

Circuitry

Output

PD24+KBD

24.00 MHz

Buffer

Output

14.32 MHz

Buffer

VDD32

Crystal

Oscillator

Output

Buffer

32.768 kHz

crystal

MDS 3230 F

Revision 022798

Printed 11/16/00

Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com

12 3 4

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