MK3230-01STR [ICSI]

Portable System Clock Synthesizer; 便携式系统时钟合成器


型号：	MK3230-01STR
厂家：	INTEGRATED CIRCUIT SOLUTION INC
描述：	Portable System Clock Synthesizer 便携式系统时钟合成器晶体外围集成电路光电二极管便携式时钟
文件：	总4页 (文件大小：71K)
中文：	中文翻译
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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

MK3230

Portable System Clock Synthesizer

_{ICR O}C_{LOC K}

Pin Assignment

CPU Clock Decoding

CPUS2 CPUS1 CPUS0 CPUCLK (MHz)

CPUS2

16 CPUS1

Off+14M off

80.00

CPUS0

25.00

CPUCLK

66.66

VDD32

VDD

GND

24M

VDD

GND

14.3M

20.00

50.00

33.33

4.00

PD24+KBD

KBOUT

Frequency transitions (except going to/from

off) will occur smoothly, and are compatible

with all 486 processors.

32K

Pin Descriptions

Number

Name

CPUS2

Type Description

Select 2 for CPUCLK frequencies. See Table above.

Crystal connection. Connect to 32.768 kHz crystal.

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 13.

Connect to ground.

VDD32

VDD

GND

24M

24 MHz floppy (or super I/O) clock output.

32K

32.768 kHz square wave clock output.

KBOUT

PD24+KBD

14.3M

GND

Keyboard clock output. Either 12MHz (-01) or 16MHz (-02)

Power Down 24M+keyboard. Shuts off both clock outputs (pins 7,9) when low.

14.318 MHz system clock output. Do not drive a CRT PLL device with this output.

Connect to ground.

VDD

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

CPUCLK output. See Table above.

CPUCLK

CPUS0

CPUS1

Select 0 for CPUCLK frequencies. See Table above.

Select 1 for CPUCLK frequencies. See Table above.

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 MK3230 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

MK3230 as possible. A 10kWseries resistor should be used to filter the VDD32 pin. A series termination

resistor of 33Wmay be used for each clock output. The device does not require (nor do we recommend)

capacitors connected to the crystal pins. The 32.768 kHz crystal must be connected as close to the chip as

possible. See Application Brief MAB02 for a discussion on tuning for use on a real time clock (RTC).

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

MK3230

Portable 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

Referenced to GND

Max of 30 seconds

-0.5

°C

260

Storage Temperature

-65

150

DC CHARACTERISTICS

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

0.4

Output High Voltage, VOH

Output Low Voltage, VOL

Input High Voltage, VIH

VDD=5V, IOH=-25mA

VDD=5V, IOL=25mA

VDD=3.3V

2.4

1.9

2.4

Input Low Voltage, VIL

VDD=3.3V

Output High Voltage, VOH

Output Low Voltage, VOL

IDD Operating Supply Current, 5V

IDD32 with only 32 kHz running, 5V

IDD Operating Supply Current, 3.3V

IDD32 with only 32 kHz running, 3.3V

Short Circuit Current, 5V

VDD=3.3V, IOH=-8mA

VDD=3.3V, IOL=8mA

No Load, 80MHz

No Load

3.5

µA

No Load, 80MHz

No Load

2.5

±30

±100

32 kHz output

Short Circuit Current, 5V

Each MHz output

Input Capacitance

Internal Crystal Capacitance

AC CHARACTERISTICS

Pins 2, 3 only

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

25 to 80 MHz

Absolute Clock Period Jitter, CPU clock

-500

500

Power up time, CPU off to 80 MHz, 32k running VDD=3.3 or 5V

Transition time, 4 MHz to 80 MHz

Transition time, 80 MHz to 4 MHz

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

VDD=3.3 or 5V

2.5

500

32.768kHz crystal with ESR £25kW

750

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 on the 14.32 MHz output : The actual output frequency from this clock is 14.3196 MHz, versus

14.31818 MHz that has been traditional. This output can be used as the input to digital chips providing

functions such as timing or keyboard, but it should NOT be used to drive a graphics PLL that is used for a

CRT display. Instead, use a 14.318MHz crystal as the input to the CRT graphics device.

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

MK3230

Portable System Clock Synthesizer

_{ICR O}C_{LOC K}

Input and Output Voltages

The MK3230 can operate with VDD = 3.0V to 5.5V, and VDD32 = 2.0V to 5.5V in any combination.

Both VDD pins (pin #5 and pin #13) must be connected to the same voltage.

The amplitude of the 32.768 kHz output clock will be equal to VDD32, and the amplitude of the MHz

clocks will be equal to VDD.

If using a clock input, the input voltage applied to X1 may not exceed VDD32, and the amplitude of any

other input may not exceed VDD. Consult MicroClock if your application is an exception to this.

Package Outline and Package Dimensions

16 pin SOIC narrow

Inches

Millimeters

Min Max

Symbol Min

Max

0.055 0.070 1.397

0.013 0.019 0.330

0.007 0.010 0.191

1.778

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

Keyboard frequency

Package

Temperature

MK3230-01S

MK3230-02S

MK3230-01S

MK3230-02S

MK3230-01S

MK3230-02S

12 MHz

16 MHz

12 MHz

16 MHz

16 pin SOIC

0-70°C

MK3230-01STR

MK3230-02STR

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 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

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