MK3233

Handheld System Clock Synthesizer

MDS 3233 F

1

Revision 11070

Printed 11/16/00

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

I C R O

• Input crystal frequency of 32.768 kHz

• Lowest power solution available

• Operating temperature of -20 to 70 °C

• Output clock frequencies up to 50 MHz

• Three output clocks

• 3.3 V or 5.0 V operation

• Duty cycle of 45/55

• Eight selectable CPU frequencies

• CPU or Communication clock power down

• Separate battery supply pin for 32 kHz runs to 2V

• IDD less than 4µA when 32 kHz running

• Serial port clocks of 1.8432 MHz (-01 version) or

3.6864 MHz (-02 version)

• Packaged in 16 pin narrow SOIC

The MK3233 is the smallest size, lowest power system

clock synthesizer available. It is the ideal way to

generate clocks for smart cell phones, 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 32.768 kHz, CPU, and serial communications

output clocks.

The device has multiple power down modes for the

CPU, communications, and 32.768 kHz clocks.

The MK3233 can save board space and cost even if it

only replaces the 32 kHz oscillator circuitry and one

additional surface mount crystal or oscillator. The

extremely low IDD, the ease of surface mounting, the

upgradeability of CPU frequencies, and the power

down capability are added benefits in using the part.

Description

Features

Crystal

Oscillator

VDD

GND

CPU

Clock Synthesis

and Control

Circuitry

CPUCLK

32.768 kHz

1.843 or

3.686 MHz

Output

Buffer

Output

Buffer

Output

Buffer

CPUS0

CPUS1

CPUS2

32.768 kHz

crystal

or

clock

Block Diagram

VDD32

PDCOMM

PDCPU

PD

X1

X2

Communications

Clock Synthesis

and Control

Circuitry