ICS7151M-20T [ICSI]

Spread Spectrum Clock Generator; 扩频时钟发生器


型号：	ICS7151M-20T
厂家：	INTEGRATED CIRCUIT SOLUTION INC
描述：	Spread Spectrum Clock Generator 扩频时钟发生器时钟发生器
文件：	总8页 (文件大小：166K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ICS7151

Spread Spectrum Clock Generator

Description

Features

The ICS7151-10, -20, -40, and -50 are clock

generators for EMI (Electro Magnetic Interference)

reduction (see below for frequency ranges and

multiplier ratios). Spectral peaks can be attenuated by

slightly modulating the oscillation frequency. Both down

and center spread profiles are selectable. Down spread

maintains an average frequency less than an unspread

clock, and will not exceed the maximum frequency of

an unspread clock.

• Operating voltage of 3.3 V 0.3 V

• Packaged in 8-pin SOIC

• Available in Pb (lead) free package

• Input frequency range of 16.5 to 33.4 MHz

• Output frequency ranges of 8.3 to 16.7 MHz, 16.5 to

33.4 MHz, 33.3 to 66.7 MHz, 66.6 to 133.4 MHz

• Provides a spread spectrum clock output ( 0.5%,

1.5% center spread; -1.0%, -3.0% down spread)

• Multiplication rates of x1/2, x1, x2, and x4

• Advanced, low-power CMOS process

Block Diagram

VDD

S1:0

PLL Clock

Synthesis

and Spread

Spectrum

Circuitry

ENS

CKOUT

XIN

Clock Buffer/

Crystal

Ocsillator

XOUT

External caps required with crystal for

accurate tuning of the clock

GND

Product Lineup

Product

Input Frequency Range

16.5 MHz to 33.4 MHz

Multiplier Ratio

Output Frequency Range

ICS7151M-10, ICS7151MI-10

ICS7151M-20, ICS7151MI-20

ICS7151M-40, ICS7151MI-40

ICS7151M-50, ICS7151MI-50

16.5 MHz to 33.4 MHz

33.3 MHz to 66.7 MHz

66.6 MHz to 133.4 MHz

8.3 MHz to 16.7 MHz

X1/2

MDS 7151 E

Revision 012306

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

ICS7151

Spread Spectrum Clock Generator

Pin Assignment

Spread Direction and Percentage

Select Table

XOUT

VDD

XIN

GND

Pin 4

(note1) (note1)

Pin 3

Spread

Direction

Spread

Percentage (%)

ENS

Center

Down

±1.5

±0.5

-1.0

-3.0

CKOUT

8 pin (150 mil) SOIC

ENS

Spread Spectrum

(note 2)

OFF

Notes:

1. The modulation rate varies with input frequency.

2. Spread will default to ON when ENS pin is left open.

Pin Descriptions

Pin Type

Pin Description

Number

Name

XIN

GND

Input

Resonator connection pin/clock input pin.

Power Connect to ground.

Input

Select pin 0. Modulation rate setting pin.

Select pin 1. Modulation rate setting pin.

CKOUT

ENS

VDD

XOUT

Output Modulated clock output pin.

Input

Modulation enable setting pin. Internal pull-up resistor.

Power Connect to +3.3 V.

Output Resonator connection pin.

MDS 7151 E

Revision 012306

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

ICS7151

Spread Spectrum Clock Generator

underneath the device, or on layers adjacent to the

ground plane layer used by the device.

External Components

The ICS7151 requires a minimum number of external

components for proper operation.

Crystal Information

Decoupling Capacitor

The crystal used should be a fundamental mode (do

not use third overtone), parallel resonant. Crystal

capacitors should be connected from pins X1 to ground

and X2 to ground to optimize the initial accuracy. The

value of these capacitors is given by the following

equation:

A decoupling capacitor of 0.01µF must be connected

between GND and VDD on pin 7, as close to this pin 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.

Crystal caps (pF) = (C - 6) x 2

Series Termination Resistor

In the equation, C is the crystal load capacitance. So,

for a crystal with a 16 pF load capacitance, two 20 pF

[(16-6) x 2] capacitors should be used.

Series termination should be used on the clock output.

To series terminate a 50Ω trace (a commonly used

trace impedance) place a 27Ω resistor in series with

the clock line, as close to the clock output pin as

possible. The nominal impedance of the clock output is

25Ω.

Spread Spectrum Profile

The ICS7151 low EMI clock generator uses a triangular

frequency modulation profile for optimal down stream

tracking of zero delay buffers and other PLL devices.

The frequency modulation amplitude is constant with

variations of the input frequency.

PCB Layout Recommendations

For optimum device performance and lowest output

phase noise, the following guidelines should be

observed.

1) The 0.01µF decoupling capacitor should be mounted

on the component side of the board as close to the

VDD pin as possible. No vias should be used between

the decoupling capacitor and VDD pin. The PCB trace

to VDD pin should be kept as short as possible, as

should the PCB trace to the ground via.

Modulation Rate

2) To minimize EMI, the 27Ω series termination resistor

(if needed) should be placed close to the clock output.

3) An optimum layout is one with all components on the

same side of the board, minimizing vias through other

signal layers. Other signal traces should be routed

away from the ICS7151. This includes signal traces just

Time

MDS 7151 E

Revision 012306

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

ICS7151

Spread Spectrum Clock Generator

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS7151. 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

7 V

All Inputs and Outputs (referenced to GND)

Ambient Operating Temperature

Storage Temperature

-0.5 V to VDD+0.5 V

-40 to +85°C

-55 to +125°C

-40 to +125°C

260°C

Junction Temperature

Soldering Temperature

Overshoot (V

)

VDD + 1.0 V (t < 50 ns)

OVER

IOVER

Undershoot (V

)

GND - 1.0 V (t

< 50 ns)

IUNDER

UNDER

Overshoot/Undershoot

t_UNDER< 50 ns

V_IOVER< V_DD+ 1.0 V

V_DD

Input pin

GND

V_IUNDER< GND - 1.0 V

t_OVER< 50 ns

Recommended Operation Conditions

Parameter

Min.

-40

Typ.

Max.

+85

3.6

Units

°C

Ambient Operating Temperature

Power Supply Voltage (measured in respect to GND)

+3.0

3.3

MDS 7151 E

Revision 012306

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

ICS7151

Spread Spectrum Clock Generator

DC Electrical Characteristics

Unless stated otherwise, VDD = 3.3 V ±±.3 V, Ambient Temperature -40 to +85°C

Parameter

Operating Voltage

Supply Current

Symbol

VDD

Conditions

Min.

Typ.

3.3

Max.

3.6

Units

3.0

IDD

No load, at 3.3 V

XIN, S0, S1, ENS

Input High Voltage

Input Low Voltage

Output High Voltage

Output Low Voltage

Input Capacitance

VDDx0.8

0.0

VDD + 0.3

VDDx0.20

CKOUT, I = -4 mA

2.0

CKOUT, I = 4 mA

0.4

XIN, S0, S1, ENS

CKOUT, 8.3 to 66.7

MHz

CKOUT, 66.7 to 100

MHz

kΩ

Load Capacitance

CKOUT, 100 to 133.4

MHz

Input Pull-up Resistor

ENS

100

240

400

AC Electrical Characteristics

Unless stated otherwise, VDD = 3.3 V ±±.3 V, Ambient Temperature -40 to +85° C

Parameter

Input Crystal Frequency

Input Clock Frequency

Symbol

Conditions

Min.

16.5

Typ.

Max. Units

33.4

MHz

CKOUT, Multiply by 1

(ICS7151-10)

CKOUT, Multiply by 2

(ICS7151-20)

33.3

66.6

8.3

66.7

133.4

16.7

MHz

Output Frequency

OUT

CKOUT, Multiply by 4

(ICS7151-40)

CKOUT, 2-frequency

division (ICS7151-50)

Input Clock Duty Cycle

Output Clock Duty Cycle

Output Slew Rate

XIN, 16.5 to 33.4 MHz

CKOUT, 1.5 V

DCC

CKOUT, 0.4 to 2.4 V,

CL = 15 pF

0.5

3.0

V/ns

MDS 7151 E

Revision 012306

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

ICS7151

Spread Spectrum Clock Generator

Parameter

Cycle to Cycle Jitter

Power-up Time

Symbol

Conditions

Min.

Typ.

Max. Units

No load, spread off

(ICS7151-10, -20)

100

150

200

No load, spread off

(ICS7151-40)

No load, spread off

(ICS7151-50)

PLL lock-time from

power-up to 1% of final

value

Modulation Frequency

CKOUT

kHz

MOD

Input Frequency (f_IN= 1/t_IN)

t_IN

0.8 V_DD

XIN

Output Slew Rate

2.4 V

0.4 V

CKOUT

t_r

t_f

SR = (2.4 - 0.4) /t_r, SR = (2.4 - 0.4) /t_f

Thermal Characteristics 8 SOIC

Parameter

Symbol

Conditions

Min.

Typ. Max. Units

Thermal Resistance Junction to

Ambient

Still air

150

140

120

°C/W

1 m/s air flow

3 m/s air flow

Thermal Resistance Junction to Case

MDS 7151 E

Revision 012306

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

ICS7151

Spread Spectrum Clock Generator

Package Outline and Package Dimensions (8-pin SOIC, 15± Mil. Body)

Package dimensions are kept current with JEDEC Publication No. 95

Millimeters

Inches

Symbol

Min

Max

1.75

0.25

0.51

0.25

5.00

4.00

Min

Max

1.35

0.10

0.33

0.19

4.80

3.80

.0532

.0040

.013

.0075

.1890

.1497

.0688

.0098

.020

.0098

.1968

.1574

INDEX

AREA

1.27 BASIC

0.050 BASIC

5.80

0.25

0.40

0°

6.20

.2284

.010

.016

0°

.2440

.020

.050

8°

0.50

1.27

8°

h x 45

- C -

SEATING

PLANE

.1± (.±±4)

MDS 7151 E

Revision 012306

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

ICS7151

Spread Spectrum Clock Generator

Ordering Information

Part / Order Number

ICS7151M-10

Marking

Shipping Packaging

Tubes

Package

8-pin SOIC

Temperature

0 to +70° C

-40 to +85° C

7151M-10

7151M10L

7151M-20

7151M20L

7151M-40

7151M40L

7151M-50

7151M50L

7151MI10

51MI10LF

7151MI20

51MI20LF

7151MI40

51MI40LF

7151MI50

51MI50LF

ICS7151M-10T

ICS7151M-10LF

ICS7151M-10LFT

ICS7151M-20

ICS7151M-20T

ICS7151M-20LF

ICS7151M-20LFT

ICS7151M-40

ICS7151M-40T

ICS7151M-40LF

ICS7151M-40LFT

ICS7151M-50

ICS7151M-50T

ICS7151M-50LF

ICS7151M-50LFT

ICS7151MI-10

ICS7151MI-10T

ICS7151MI-10LF

ICS7151MI-10LFT

ICS7151MI-20

ICS7151MI-20T

ICS7151MI-20LF

ICS7151MI-20LFT

ICS7151MI-40

ICS7151MI-40T

ICS7151MI-40LF

ICS7151MI-40LFT

ICS7151MI-50

ICS7151MI-50T

ICS7151MI-50LF

ICS7151MI-50LFT

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

Tubes

Tape and Reel

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

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.

MDS 7151 E

Revision 012306

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

ICS7151M-20T [ICSI]

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