MK3754SLFTR [IDT]

Clock Generator, 54MHz, CMOS, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOIC-8;


型号：	MK3754SLFTR
厂家：	INTEGRATED DEVICE TECHNOLOGY
描述：	Clock Generator, 54MHz, CMOS, PDSO8, 0.150 INCH, ROHS COMPLIANT, SOIC-8 时钟光电二极管外围集成电路晶体
文件：	总7页 (文件大小：169K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DATASHEET

LOW COST 54 MHZ 3.3 VOLT VCXO

MK3754

The frequency of the on-chip VCXO is adjusted by an

external control voltage input into pin VIN. Because VIN is a

high impedance input, it can be driven directly from an

PWM RC integrator circuit. Frequency output increases

with VIN voltage input. The usable range of VIN is 0 to 3 V.

Description

The MK3754D and MK3754B are drop-in replacements for

the MK3754S device. Compared to these earlier devices

the MK3754D and MK3754B offer a wider operating

frequency range and improved power supply noise

rejection.

Features

The MK3754 is ICS’ lowest cost, low jitter, high

performance 3.3 Volt VCXO and PLL clock synthesizer

designed to replace expensive 54 MHz VCXOs. The

on-chip Voltage Controlled Crystal Oscillator accepts a 0 to

3.3 V input voltage to vary the output clocks by ±±00 ppm.

Using ICS’ patented VCXO and analog/digital

Phase-Locked Loop (PLL) techniques, the device uses an

inexpensive external ±3.5 MHz pullable crystal input to

produce a 54 MHz output clock.

• MK3754D and MK3754B are drop-in upgrades to the

earlier MK3754S device

• Packaged in 8-pin SOIC

• Available in Pb (lead) free package

• Operating voltage of 3.3 V

• Uses an inexpensive ±3.500 MHz external crystal

• On-chip VCXO (patented) with pull range of 200 ppm

The MK3754D exhibits a moderate VCXO gain of

±20 ppm/V typical, when used with a high quality external

pullable quartz crystal. The MK3754B offers a higher

VCXO gain of ±50 ppm/V. The higher intrinsic VCXO gain

of the MK3754B may help compensate for the reduced

pullability of a low quality crystal used in some applications.

However, higher VCXO gain may also increase clock output

phase noise.

(minimum)

• VCXO turning voltage of 0 to 3.3V

• ±2 mA output drive capability at TTL levels

• Advanced, low power, sub-micron CMOS process

MK3754D is Recommended for New Designs.

Block Diagram

VDD

VIN

X±

±3.5 MHz

Pullable

PLL/Clock

Synthesis

Circuitry

Voltage

Controlled

Crystal

Oscillator

54 MHz

Crystal

GND

IDT™ / ICS™ LOW COST 54 MHZ 3.3 VOLT VCXO

MK3754

REV H 072805

MK3754

LOW COST 54 MHZ 3.3 VOLT VCXO

VCXO AND MULTIPLIER

Pin Assignment

X ±

V D D

V I N

X 2

G N D

CLK

V D D

G N D

M K 3 7 5 4 S

M K 3 7 5 4 B

M K 3 7 5 4 D

8 P i n ( 1 5 0 m i l ) S O I C

Pin Descriptions

Number

Name

Type

Pin Description

Input Crystal connection. Connect to the external pullable crystal.

Power Connect to +3.3 V (0.0±uf decoupling capacitor recommended).

VDD

VIN

Input Voltage input to VCXO -- 0 to 3.3 V analog input which controls the

oscillation frequency of the VCXO.

GND

VDD

CLK

GND

Power Connect to ground.

Power Connect to +3.3 V (0.0±uf decoupling capacitor recommended).

Output 54 MHz clock output.

Power Connect to ground.

Input Crystal connection. Connect to the external pullable crystal.

IDT™ / ICS™ LOW COST 54 MHZ 3.3 VOLT VCXO

MK3754

REV H 072805

MK3754

LOW COST 54 MHZ 3.3 VOLT VCXO

VCXO AND MULTIPLIER

as possible and should be on the same side of the PCB as

the MK3754. There should be no via’s between the crystal

pins and the X± and X2 device pins. There should be no

signal traces underneath or close to the crystal.

External Component Selection

The MK3754 requires a minimum number of external

components for proper operation.

Crystal Tuning Load Capacitors

Decoupling Capacitor

A decoupling capacitor of 0.0± µF must be connected

between VDD (pin 2) and GND (pin 4), as close to these

pins as possible. For optimum device performance, the

decoupling capacitor should be mounted on the component

side of the PCB. Avoid the use of vias in the decoupling

circuit.

The crystal traces should include pads for small fixed

capacitors, one between X± and ground, and another

between X2 and ground. Stuffing of these capacitors on the

PCB is optional. The need for these capacitors is

determined at system prototype evaluation, and is

influenced by the particular crystal used (manufacture and

frequency) and by PCB layout. The typical required

capacitor value is ± to 4 pF.

Series Termination Resistor

When the PCB trace between the clock output (CLK, pin 5)

and the load is over ± inch, series termination should be

used. To series terminate a 50Ω trace (a commonly used

trace impedance) place a 33Ω resistor in series with the

clock line, as close to the clock output pin as possible. The

nominal impedance of the clock output is 20Ω.

The procedure for determining the value of these capacitors

can be found in application note MAN05.

Quartz Crystal

The MK3754 VCXO function consists of the external crystal

and the integrated VCXO oscillator circuit. To assure the

best system performance (frequency pull range) and

reliability, a crystal device with the recommended

parameters (shown below) must be used, and the layout

guidelines discussed in the following section shown must be

followed.

The frequency of oscillation of a quartz crystal is determined

by its “cut” and by the load capacitors connected to it. The

MK3754 incorporates on-chip variable load capacitors that

“pull” (change) the frequency of the crystal. The crystal

specified for use with the MK3754 is designed to have zero

frequency error when the total of on-chip + stray

capacitance is

±4 pF.

Recommended Crystal Parameters:

Initial Accuracy at 25°C

Temperature Stability

Aging

Load Capacitance

Shunt Capacitance, C0

C0/C± Ratio

±20 ppm

±30 ppm

±20 ppm

±4 pf

7 pF Max

250 Max

35 Ω Max

Equivalent Series Resistance

The external crystal must be connected as close to the chip

IDT™ / ICS™ LOW COST 54 MHZ 3.3 VOLT VCXO

MK3754

REV H 072805

MK3754

LOW COST 54 MHZ 3.3 VOLT VCXO

VCXO AND MULTIPLIER

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the MK3754. These ratings, which are

standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at

these or any other conditions above those indicated in the operational sections of the specifications is not implied.

Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical

parameters are guaranteed only over the recommended operating temperature range.

Item

Rating

Supply Voltage, VDD

All Inputs and Outputs

-0.5V to VDD+0.5V

0 to +70°C

Ambient Operating Temperature

Storage Temperature

-65 to +±50°C

260°C

Soldering Temperature

Recommended Operation Conditions

Parameter

Min.

Typ.

Max.

+70

Units

°C

Ambient Operating Temperature

Power Supply Voltage (measured in respect to GND)

Reference crystal parameters

–

+3.±5

+3.45

Refer to page 3

IDT™ / ICS™ LOW COST 54 MHZ 3.3 VOLT VCXO

MK3754

REV H 072805

MK3754

LOW COST 54 MHZ 3.3 VOLT VCXO

VCXO AND MULTIPLIER

DC Electrical Characteristics

VDD=3.3 V 5ꢀ , Ambient temperature 0 to +70°C, unless stated otherwise

Parameter

Symbol

Conditions

Min.

3.±5

2.4

Typ.

Max.

Units

Operating Voltage

VDD

3.45

Output High Voltage

Output Low Voltage

= -±2 mA

= ±2 mA

= -4 mA

0.4

Output High Voltage (CMOS

Level)

VDD-0.4

Operating Supply Current

Short Circuit Current

IDD

No load

±50

VIN, VCXO Control Voltage

3.3

AC Electrical Characteristics

VDD = 3.3 V 5ꢀ, Ambient Temperature 0 to +70° C, unless stated otherwise

Parameter

Symbol

Conditions

Min. Typ. Max. Units

Crystal Pullability

MK3754D and

MK3754B

0V< VIN < 3.3 V, Note ±

+ ±±5

+ ±00

ppm

MK3754S

VCXO Gain

MK3754D

VIN = VDD/2 + ± V, Note ±

±20

±50

±00

ppm/V

MK3754B

MK3754S

Output Rise Time

Output Fall Time

Output Clock Duty Cycle

0.8 to 2.0 V, C =±5 pF

±.5

2.0 to 0.8 V, C =±5 pF

Measured at ±.4 V, C =±5 pF

Maximum Output Jitter,

short term

C =±5 pF

±00

Note ±: External crystal device must conform with Pullable Crystal Specifications listed on page 3.

IDT™ / ICS™ LOW COST 54 MHZ 3.3 VOLT VCXO

MK3754

REV H 072805

MK3754

LOW COST 54 MHZ 3.3 VOLT VCXO

VCXO AND MULTIPLIER

Package Outline and Package Dimensions (8-pin SOIC, ±50 Mil. Narrow Body)

Package dimensions are kept current with JEDEC Publication No. 95

Millimeters

Inches*

Min Max

0.0532 0.0688

0.0040 0.0098

Symbol

Min

Max

±.75

0.25

0.5±

0.25

5.00

4.00

A±

±.35

±.±0

0.33

0.±9

4.80

3.80

Index

Area

0.0±3

0.0075 0.0098

.±890 .±968

0.020

0.±497 0.±574

0.050 Basic

±.27 Basic

5.80

0.25

0.40

0°

6.20

0.50

±.27

8°

0.2284 0.2440

Pin ±

h x 45⁰

0.0±0

0.0±6

0°

0.020

0.050

8°

*For reference only. Controlling dimensions in mm.

Ordering Information

Part/Order Number (Note 1)

MK3754D

Marking

MK3754D

3754DLF

MK3754B

3754BLF

MK3754S

3754SLF

Shipping Packaging

Tubes

Package

8-pin SOIC

Temperature

0 to +70° C

MK3754DTR

MK3754DLF

Tape and Reel

Tubes

MK3754DLFTR

MK3754B

MK3754BTR

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

MK3754BLF

MK3754BLFTR

MK3754S

MK3754STR

MK3754SLF

MK3754SLFTR

Tape and Reel

Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.

Note 1: MK3754D and MK3754DLF are recommended for new designs. Call factory for information on MK3754S.

While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) 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 ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS

does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.

IDT™ / ICS™ LOW COST 54 MHZ 3.3 VOLT VCXO

MK3754

REV H 072805

MK3754

LOW COST 54 MHZ 3.3 VOLT VCXO

VCXO AND MULTIPLIER

Innovate with IDT and accelerate your future networks. Contact:

www.IDT.com

For Sales

800-345-7015

408-284-8200

Fax: 408-284-2775

For Tech Support

Corporate Headquarters

Integrated Device Technology, Inc.

6024 Silver Creek Valley Road

San Jose, CA 95138

Asia Pacific and Japan

Integrated Device Technology

Singapore (1997) Pte. Ltd.

Reg. No. 199707558G

435 Orchard Road

Europe

IDT Europe, Limited

Prime House

Barnett Wood Lane

Leatherhead, Surrey

United Kingdom KT22 7DE

+44 1372 363 339

United States

800 345 7015

#20-03 Wisma Atria

+408 284 8200 (outside U.S.)

Singapore 238877

+65 6 887 5505

Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered

trademarks used to identify products or services of their respective owners.

Printed in USA

MK3754SLFTR [IDT]

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