ASM3I2111BG-08SR--Datasheet/数据表在线中文翻译

May 2005

rev 0.1

ASM3P2111B

Peak EMI Reducing Solution

Features

allows significant system cost savings by reducing the

number of circuit board layers and shielding that are

required to pass EMI regulations. The ASM3P2111B

modulates the output of PLL in order to spread the

bandwidth of a synthesized clock, thereby decreasing the

peak amplitudes of its harmonics. This results in

significantly lower system EMI compared to the typical

narrow band signal produced by oscillators and most

clock generators. Lowering EMI by increasing a signal’s

bandwidth is called spread spectrum clock generation.

Generates an EMI optimized clock at the output.

Input frequency: 25 MHz.

Frequency outputs:

o

60 MHz (unmodulated)

2 x 48 MHz (unmodulated)

66.6 MHz (modulated): -1.7% down spread

Modulation rate: 30 KHz.

Supply voltage range: 3.3V ± 0.3V.

Available in 8-pin SOIC Package.

Commercial and Industrial Temperature range.

RoHS Compliant

Applications

ASM3P2111B is targeted towards EMI management for

high speed digital applications such as PC peripheral

devices, consumer electronics and embedded controller

systems.

Product Description

The ASM3P2111B is

a versatile spread spectrum

frequency modulator that reduces electromagnetic

interference (EMI) at the clock source. The ASM3P2111B

Block Diagram

V

DD

60 MHz

XIN /CLKIN

XOUT

Crystal

Oscillator

PLL1

48 MHz_1

48 MHz_2

48 MHz_1

PLL2

66.6 MHz

Modulated

V

SS

Alliance Semiconductor

2575 Augustine Drive • Santa Clara CA • Tel: 408-855-4900 • Fax: 408-855-4999 • www.alsc.com

May 2005

rev 0.1

ASM3P2111B

Pin Configuration

8

7

6

5

XIN/ CLKIN

XOUT

V

1

2

SS

66.6 MHz

48 MHz_1

48 MHz_2

ASM3P2111B

V

DD

3

4

60 MHz

Pin Description

Description

Pin #

Pin Name

Type

Connection to crystal

1

2

3

4

5

6

7

8

XIN / CLKIN

XOUT

I

Connection to crystal

O

P

O

P

Power supply for the analog and digital blocks (+3.3V)

Clock output-1 60 MHz un-modulated

V_DD

60 MHz

48 MHz_2

48 MHz_1

66.6 MHz

V_SS

Clock output-2 48 MHz_2 un-modulated

Clock output-3 48 MHz_1 un-modulated

Clock output-4 66.6 MHz modulated

Ground to entire chip. Connect to System Ground

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Absolute Maximum Ratings

Symbol

Parameter

Voltage on any pin with respect to Ground

Rating

-0.5 to +7.0

-65 to +125

0 to 70

Unit

V

°C

V_DD, V_IN

T_STG

T_A

Storage temperature

Operating temperature

T_s

T_J

Max. Soldering Temperature (10 sec)

260

150

Junction Temperature

Static Discharge Voltage

T_DV

2

KV

(As per JEDEC STD 22- A114-B)

Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect

device reliability.

Operating Conditions

Parameter

Supply Voltage

Crystal Resonator Frequency

Output Driver Load Capacitance

Symbol

V_DD

Condition / Description

Min

3

25

-

Typ

3.3

-

Max

3.6

-

Unit

V

MHz

pF

3.3V ± 0.3V

F_XIN

C_L

15

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ASM3P2111B

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DC Electrical Characteristics

Parameter

Symbol

Conditions / Description

Min

Typ

Max

Unit

Overall

Supply Current,

Dynamic

Supply Current,

Static

I_DD

V_DD=3.3V, F_CLK=25MHz, C_L=15pF

V_DD= 3.3V, Clock Input = 0

41

20

48

25

62

35

mA

I_DDL

All input pins

High-Level Input

Voltage

Low-Level Input

Voltage

V_IH

V_IL

I_IH

V_DD=3.3V

2.0

-

V_DD+0.3

V

V_SS-0.3

0.8

1

V

High-Level Input

Current

µ A

-1

-20

-

Low-Level Input

Current (pull-up)

High-Level Output

Source Current

Low-Level Output

Sink Current

µ A

I_IL

-36

3

-80

-

I_xOH

I_xOL

V_DD=V (XIN) = 3.3V, V_O=0.4V

V_DD=3.3V, V (XIN)=V_O=2.5V

mA

-

3

-

Clock Outputs

High-Level Output

Source Current

Low-Level Output

Sink Current

I_OH

I_OL

V_O=2.5V

V_O=0.4V

-

-20

23

-

mA

Ω

Z_OH

Z_OL

V_O=0.5V_DD; output driving high

Vo=0.5V_DD; output driving low

-

29

27

-

Output Impedance

AC Electrical Characteristics

Parameter

Symbol

Conditions/ Description

V_O= 0.8V to 2.0V;

C_L= 15pF

Min

Typ

Max

Unit

Rise Time

t_r

300

800

900

pS

V_O= 2.0V to 0.8V;

C_L= 15pF

Ratio of pulse width (as measured from

rising edge to next falling edge at V_DD/2) to

one clock period

Fall Time

t_f

360

45

800

900

55

pS

%

Clock Duty

Cycle

-

* C_L= 15 pF, Input clock frequency = 25 MHz

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Typical Crystal Oscillator Circuit

R1 = 510Ω

Crystal

C1 = 27 pF

C2 = 27 pF

Typical Crystal Specifications

Fundamental AT cut parallel resonant crystal

Nominal frequency

25 MHz

Frequency tolerance

Operating temperature range

Storage temperature

Load capacitance

Shunt capacitance

ESR

± 50 ppm or better at 25°C

-25°C to +85°C

-40°C to +85°C

18pF

7pF maximum

25 Ω

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Package Information

8-Pin SOIC Package

H

E

D

A2

A

C

θ

e

A1

L

B

Dimensions

Symbol

Millimeters

Inches

Min

Max

Min

Max

A1

A

0.004

0.010

0.10

0.25

0.053

0.049

0.012

0.007

0.069

0.059

0.020

0.010

1.35

1.25

0.31

0.18

1.75

1.50

0.51

0.25

A2

B

C

D

E

0.193 BSC

0.154 BSC

0.050 BSC

0.236 BSC

4.90 BSC

3.91 BSC

1.27 BSC

6.00 BSC

e

H

L

0.016

0°

0.050

8°

0.41

0°

1.27

8°

θ

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Ordering Codes

Marking

Part number

Package Configuration

8-pin SOIC TUBE, Pb Free

Temperature Range

Commercial

Industrial

ASM3P2111BF-08ST

ASM3P2111BF-08SR

ASM3I2111BF-08ST

ASM3I2111BF-08SR

ASM3P2111BG-08ST

ASM3P2111BG-08SR

ASM3I2111BG-08ST

ASM3I2111BG-08SR

3P2111BF

3I2111BF

3P2111BG

3I2111BG

8-pin SOIC TAPE & REEL, Pb Free

8-pin SOIC TUBE, Pb Free

8-pin SOIC TAPE & REEL, Pb Free

8-pin SOIC TUBE, Green

Industrial

Commercial

Industrial

8-pin SOIC TAPE & REEL, Green

8-pin SOIC TUBE, Green

8-pin SOIC TAPE & REEL, Green

Industrial

Ordering Information

A S M 3 P 2 1 1 1 B F - 0 8 S R

R = Tape & reel, T = Tube or Tray

O = SOT

U = MSOP

E = TQFP

L = LQFP

U = MSOP

P = PDIP

S = SOIC

T = TSSOP

A = SSOP

V = TVSOP

B = BGA

D = QSOP

X = SC-70

Q = QFN

DEVICE PIN COUNT

F = LEAD FREE AND RoHS COMPLIANT PART

G = GREEN PACKAGE

PART NUMBER

X= Automotive

I= Industrial

P or n/c = Commercial

(0C to +70C)

(-40C to +125C)

(-40C to +85C)

1 = Reserved

6 = Power Management

2 = Non PLL based

3 = EMI Reduction

7 = Power Management

8 = Power Management

9 = Hi Performance

0 = Reserved

4 = DDR support products

5 = STD Zero Delay Buffer

ALLIANCE SEMICONDUCTOR MIXED SIGNAL PRODUCT

Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.

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May 2005

rev 0.1

ASM3P2111B

Alliance Semiconductor Corporation

2575, Augustine Drive,

Santa Clara, CA 95054

Tel# 408-855-4900

Part Number: ASM3P2111B

Document Version: v0.1

Fax: 408-855-4999

www.alsc.com

Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003

trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their

respective companies. Alliance reserves the right to make changes to this document and its products at any time without

notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein

represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the right to change or correct this

data at any time, without notice. If the product described herein is under development, significant changes to these

specifications are possible. The information in this product data sheet is intended to be general descriptive information for

potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or

customer. Alliance does not assume any responsibility or liability arising out of the application or use of any product

described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products

including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual

property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance).

All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of

products from Alliance does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any

other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as critical

components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant

injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer

assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.

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