MK3235-01SLFTR [IDT]

Clock Generator, 14.3MHz, PDSO16, SOIC-16;


型号：	MK3235-01SLFTR
厂家：	INTEGRATED DEVICE TECHNOLOGY
描述：	Clock Generator, 14.3MHz, PDSO16, SOIC-16 光电二极管
文件：	总4页 (文件大小：67K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MK3235

Handheld System Clock Synthesizer

_{ICR O}C_{LOC K}

Description

Features

• Input crystal frequency of 32.768 kHz

• Lowest power solution available

The MK3235 is the smallest size, lowest power system

clock synthesizer available. It is the ideal way to

generate clocks for handheld computers, such as PDAs,

PICs, 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, 14.318MHz, and serial

communications output clocks.

• Lowest profile clock solution where height is critical

• Three output clocks

• 3.3V or 5.0V operation

• Duty cycle of 45/55

The device has three power down modes for the

14.3MHz, communications, and 32.768kHz clocks.

• 14.3MHz or 14.3MHz+Comm clock power downs

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

• IDD less than 4µA when 32 kHz running

• Packaged in 16 pin narrow SOIC

The MK3235 can save board space and cost even if it

only replaces the 32kHz oscillator circuitry and one

additional surface mount crystal or oscillator. The

extremely low IDD, the ease of surface mounting, and

the power down capability are added benefits in using

the part.

Block Diagram

VDD GND

14.318MHz

PD14

Output

Buffer

Clock Synthesis

and Control

Circuitry

14.3 MHz

PDCOMM

Communications

Clock Synthesis

and Control

Output

Buffer

1.843 or

3.686 MHz

VDD32

Circuitry

32.768 kHz

crystal

Crystal

Oscillator

Output

Buffer

32.768 kHz

MDS 3235 D

Revision 092397

Printed 11/16/00

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

MK3235

Handheld System Clock Synthesizer

_{ICR O}C_{LOC K}

Pin Assignment

16 GND

VDD32

VDD

GND

VDD

PD14

GND

14.3M

GND

COMMCLK

32K

GND

PDCOMM

Pin Descriptions

Number

Name

Type Description

Crystal connection. Connect to 32.768 kHz crystal.

VDD32

VDD

Separate power supply connection for 32.768kHz clock. Will operate to 2.0V.

Connect to +3.3V or +5V. Must be the same voltage as pin 14.

Connect to ground.

GND

COMMCLK

32K

Serial communications (1.84 on -01 version, or 3.68MHz on -02 version) clock output.

32.768 kHz square wave clock output.

PDCOMM

GND

Power Down serial Communications and 14.3M clock outputs (stop low) when low.

Connect to ground.

Powers Down everything but 32kHz oscillator internally. 32kHz output buffer is off.

14.318 MHz output clock.

14.3M

GND

Connect to ground.

PD14

VDD

Power Down 14.318MHz clock output (stops low) when low.

Connect to +3.3V or +5V. Must be the same voltage as pin 4.

Connect to ground.

GND

Connect to ground.

Type: I = Input, O = output, P = power supply connection

Power Down status: Output clocks will stop in a low state when powered down

External Components

The MK3235 requires a minimum number of external components for proper operation. Decoupling

capacitors of 0.1µF should be connected between VDD and GND, and VDD32 and GND, as close to the

MK3235 as possible. A series resistor should be used on the VDD32 supply. A series termination resistor of

33Wmay be used for each clock output, except the 32.768 kHz. For tuning the real time clock output, use

a 32.768 kHz crystal with a load capacitance of 12.5pF, and connect a 20pF±5% (NPO dielectric)

capacitor between each crystal pin and ground. The 32.768 kHz crystal must be connected as close to the

chip as possible. Consult MicroClock for a recommended external circuit schematic.

MDS 3235 D

Revision 092397

Printed 11/16/00

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

MK3235

Handheld System Clock Synthesizer

_{ICR O}C_{LOC K}

Electrical Specifications

Parameter

Conditions

Minimum

Typical

Maximum

Units

ABSOLUTE MAXIMUM RATINGS (note 1)

Supply Voltage, VDD

Referenced to GND

VDD+0.5

Inputs and Clock Outputs

Ambient Operating Temperature

Soldering Temperature

Storage Temperature

Referenced to GND

Max of 30 seconds

-0.5

°C

260

-65

150

DC CHARACTERISTICS (at 5.0V unless otherwise noted)

Operating Voltage, VDD

3.0

2.0

5.5

Operating Voltage,VDD32

Input High Voltage, VIH

VDD=5V

Input Low Voltage, VIL

VDD=5V

0.8

Output High Voltage, VOH, 3.3V or 5V

Output High Voltage, VOH

Output Low Voltage, VOL

IOH=-4mA

VDD-0.4

2.4

VDD=5V, IOH=-25mA

VDD=5V, IOL=25mA

VDD=3.3V

0.4

Input High Voltage, VIH

1.9

2.4

Input Low Voltage, VIL

VDD=3.3V

Output High Voltage, VOH

Output Low Voltage, VOL

VDD=3.3V, IOH=-8mA

VDD=3.3V, IOL=8mA

No Load

IDD Operating Supply Current, 5V

IDD32 with only 32 kHz running, 5V

IDD Operating Supply Current, 3.3V

3.5

µA

No Load

IDD32 with only 32 kHz output running, 3.3V No Load

2.5

IDD32, only 32 kHz osc. running, 3.3V, note 2

Short Circuit Current, 5V

32kHz output off. PD=0

32kHz output

±30

±80

Short Circuit Current, 5V

14, 1.8MHz outputs

Input Capacitance

AC CHARACTERISTICS (at 5.0V unless otherwise noted)

Input Frequency

32.768

kHz

Output Clock Rise and Fall Time, 0.2 to 0.8VDD

Output Clock Duty Cycle, all MHz clocks

32.768 kHz Clock Duty Cycle

At VDD/2

49 to 51

At VDD32/2

14.318 MHz

Absolute Clock Period Jitter

-500

500

Power up time, to all clocks stable, 32k running VDD=3.3 or 5V

Power on time,VDD32=0V to all clocks stable

Power on time, all power down pins taken high

32.768kHz crystal with ESR £25kW

500

1000

32.768kHz oscillator running

Note 1: Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged

exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability.

Note 2: When PD=0 (low) and VDD32 is greater than 2.0V, then the 32kHz oscillator will continue to run on the chip, but the

output is turned off. This allows for a quick power-up (<20ms), while the chip is only consuming approximately 1µA.

MDS 3235 D

Revision 092397

Printed 11/16/00

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

MK3235

Handheld System Clock Synthesizer

_{ICR O}C_{LOC K}

Package Outline and Package Dimensions

16 pin SOIC narrow

Inches

Millimeters

Min Max

0.055 0.068 1.397 1.7272

Symbol Min

Max

0.013 0.019 0.330

0.007 0.010 0.191

0.483

0.254

0.385 0.400 9.779 10.160

0.150 0.160 3.810

0.225 0.245 5.715

4.064

6.223

.050 BSC

0.016

0.01

1.27 BSC

0.406

0.254

h x 45°

0.004

0.102

Ordering Information

Part/Order Number

Marking

Communications Clock

Package

Temperature

MK3235-01S

MK3235-02S

MK3235-01S

MK3235-02S

MK3235-01S

MK3235-02S

1.843 MHz

3.686 MHz

1.843 MHz

3.686 MHz

16 pin SOIC

0-70°C

MK3235-01STR

MK3235-02STR

Add Tape & Reel

While the information presented herein has been checked for both accuracy and reliability, MicroClock Incorporated assumes no responsibility for either its use or for the

infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in

normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements

are not recommended without additional processing by MicroClock. MicroClock reserves the right to change any circuitry or specifications without notice. MicroClock does not

authorize or warrant any MicroClock product for use in life support devices or critical medical instruments.

MDS 3235 D

Revision 092397

Printed 11/16/00

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

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