ASM3P2814BG-08SR - ON Semiconductor L.L.C.

August, 2011 − Rev. 3

1Publication Order Number:

ASM3P2811A/D

ASM3P2811A/B,

ASM3P2812A/B,

ASM3P2814A/B

Low Power EMI Reduction IC

Description

The ASM3P28XX devices are versatile spread spectrum frequency

modulators designed specifically for a wide range of input clock

frequencies from 10 MHz to 40 MHz. Refer to Input/Output

Frequency Range Selection Table. The ASM3P28XX can generate an

EMI reduced clock from crystal, ceramic resonator, or system clock.

The ASM3P28XX−A and the ASM3P28XX−B offer various

combinations of spread options and percentage deviations. Refer to

Frequency Deviation and Spread Selection Table. These combinations

include Down and Center Spread, and percentage deviation range

from ±0.625% to −3.5%.

The ASM3P28XX reduces electromagnetic interference (EMI) at

the clock source, allowing system wide reduction of EMI of down

stream clock and data dependent signals. The ASM3P28XX allows

significant system cost savings by reducing the number of circuit

board layers, ferrite beads, shielding, and other passive components

that are traditionally required to pass EMI regulations.

The ASM3P28XX modulates the output of a single PLL in order to

“spread” the bandwidth of a synthesized clock, and more importantly,

decreases 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 frequency generators.

Lowering EMI by increasing a signal’s bandwidth is called ‘spread

spectrum clock generation.’

The ASM3P28XX uses the most efficient and optimized

modulation profile approved by the FCC and is implemented in a

proprietary all−digital method.

Applications

The ASM3P28XX is targeted towards EMI management for memory and LVDS interfaces in mobile graphic chipsets and

high−speed digital applications such as PC peripheral devices, consumer electronics, and embedded controller systems.

Features

•FCC Approved Method of EMI Attenuation

•Provides up to 15 dB EMI Reduction

•Generates a 1x, 2x and 4x Low EMI Spread Spectrum

Clock of the Input Frequency

♦1x: ASM3P2811A/B

♦2x: ASM3P2812A/B

♦4x: ASM3P2814A/B

•Optimized for Input Frequency Range from 10 MHz to

40 MHz

•Internal Loop Filter Minimizes External Components

and Board Space

•Selectable Spread Options:

♦Down Spread and Center Spread

•8 Frequency Deviation Selections:

♦±0.625% to −3.5%

•Low Inherent Cycle−to−Cycle Jitter

•3.3 V Operating Voltage

•CMOS/TTL Compatible Inputs and Outputs

•Pin−out Compatible with Cypress CY25811, CY25812

and CY25814

•Commercial and Industrial Temperature Range

•Available in 8−pin SOIC and TSSOP Packages

•These Devices are Pb−Free, Halogen Free/BFR Free

and are RoHS Compliant

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SOIC−8

S SUFFIX

CASE 751BD

PIN CONFIGURATION

(Top View)

See detailed ordering and shipping information in the package

dimensions section on page 7 of this data sheet.

ORDERING INFORMATION

XOUT

VDD

FRS

ModOUT

VSS

D_C

XIN / CLKIN

SRS

TSSOP−8

T SUFFIX

CASE 948AL

ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B

http://onsemi.com

Figure 1. Block Diagram

VDD

PLL

VCO

VSS

ModOUT

Loop

Filter

Output

Divider

Crystal

Oscillator

XOUT

XIN / CLKIN

Phase

Detector

D_C SRS FRS

Modulation

Frequency

Divider

Feedback

Divider

Table 1. PIN DESCRIPTION

Pin# Pin Name Type Description

1XIN / CLKIN ICrystal connection or external Clock input.

2 VSS P Ground to entire chip.

3 D_C I Digital logic input used to select Down (LOW) or Center (HIGH) spread options.

(Refer to Frequency Deviation and Spread Selection Table).

This pin has an internal pull−up resistor.

4 SRS I Spread range select. Digital logic input used to select frequency deviation

(Refer to Frequency Deviation and Spread Selection Table).

This pin has an internal pull−up resistor.

5 ModOUT O Spread spectrum clock output

6 FRS I Frequency range select. Digital logic input used to select Input frequency range

(Refer to Input/Output Frequency Range Selection Table).

This pin has an internal pull−up resistor.

7 VDD P Power supply for the entire chip.

8 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected.

Table 2. INPUT/OUTPUT FREQUENCY RANGE SELECTION

FRS (pin 6)

Part Number

Modulation Rate

ASM3P2811 (1x) ASM3P2812 (2x) ASM3P2814 (4x)

Input

(MHz)

Output

(MHz)

Input

(MHz)

Output

(MHz)

Input

(MHz)

Output

(MHz)

0 10−20 10−20 10−20 20−40 10−20 40−80 Input Frequency / 448

1 20−40 20−40 20−40 40−80 20−40 80−160 Input Frequency / 896

ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B

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Table 3. OUTPUT FREQUENCY DEVIATION AND SPREAD SELECTION

Part Number D_C (pin 3) SRS (pin 4)

Frequency Deviation (%) (Note 1)

FS = 0 FS = 1

10/20/40 (MHz) 20/40/80 (MHz) 20/40/80 (MHz) 40/80/160 (MHz)

ASM3P28XXA 0 0 −3−2.5 −2.7 −2.6

0 1 −3.7 −3.4 −3.8 −3.6

1 0 ±1.5 ±1.2 ±1.5 ±1.3

1 1 ±1.8 ±1.6 ±1.9 ±1.8

ASM3P28XXB 0 0 −1.7 −1.0 −1.5 −1.4

0 1 −2.0 −1.5 −2.0 −1.9

1 0 ±0.75 ±0.6 ±0.8 ±0.7

1 1 ±1.0 ±0.75 ±1.0 ±0.9

1. Frequency Deviation given in the table is for the Output Frequency Range covering ASM3P2811x / 12x / 14x.

Table 4. ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Rating Unit

VDD, VIN Voltage on any pin with respect to Ground −0.5 to +4.6 V

TSTG Storage temperature −65 to +125 °C

TsMax. Soldering Temperature (10 sec) 260 °C

TJJunction Temperature 150 °C

TDV Static Discharge Voltage (As per JEDEC STD 22− A114−B) 2 KV

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

Table 5. OPERATING CONDITIONS

Symbol Parameter Min Max Unit

VDD Voltage on any pin with respect to GND 3.0 3.6 V

TAOperating temperature −40 +85 °C

CLLoad Capacitance 10 pF

CIN Input Capacitance 7 pF

ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B

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Table 6. DC ELECTRICAL CHARACTERISTICS

Symbol Parameter Min Typ Max Unit

VIL Input low voltage VSS−0.3 0.8 V

VIH Input high voltage 2 VDD+0.3 V

IIL Input low current

(Inputs D_C, SRS and FRS are pulled high internally)

−50 mA

IIH Input high current 50 mA

IXOL XOUT Output low current (VXOL @ 0.4 V, VDD = 3.3 V) 3 mA

IXOH XOUT Output high current (VXOH @ 2.5 V, VDD = 3.3 V) 3 mA

VOL Output low voltage (VDD = 3.3 V, IOL = 5 mA) 0.4 V

VOH Output high voltage (VDD = 3.3 V, IOH = −5 mA) 2.5 V

ICC Dynamic supply current (Unloaded Output) 8 18 mA

IDD Static supply current, Standby mode (CLKIN pulled to GND) 4.5 mA

VDD Operating voltage 3.0 3.3 3.6 V

tON Power up time (first locked clock cycle after power up) 500 mS

ZOUT Clock out impedance 76 W

Table 7. AC ELECTRICAL CHARACTERISTICS

Symbol Parameter Min Typ Max Unit

fIN Input frequency for ASM3P2811/12/13/14 A/B 10 40 MHz

fOUT Output frequency for ASM3P2811A/B 10 40 MHz

Output frequency for ASM3P2812A/B 20 80 MHz

Output frequency for ASM3P2814A/B 40 160 MHz

tLH (Note 2) Output rise time (measured at 0.8 V to 2.0 V) 0.5 0.9 1.2 nS

tHL (Note 2) Output fall time (measured at 2.0 V to 0.8 V) 0.8 1.0 1.3 nS

tJC Cycle−to−Cycle Jitter (Unloaded Output) ±250 pS

tDOutput duty cycle 45 50 55 %

2. tLH and tHL are measured into a capacitive load of 10 pF.

ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B

http://onsemi.com

PACKAGE DIMENSIONS

TSSOP8, 4.4x3

CASE 948AL−01

ISSUE O

E1 E

TOP VIEW

SIDE VIEW END VIEW

L1 L

Notes:

(1) All dimensions are in millimeters. Angles in degrees.

(2) Complies with JEDEC MO-153.

SYMBOL

MIN NOM MAX

0º 8º

0.05

0.80

0.19

0.09

0.50

2.90

6.30

4.30

0.65 BSC

1.00 REF

1.20

0.15

1.05

0.30

0.20

0.75

3.10

6.50

4.50

0.90

0.60

3.00

6.40

4.40

ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B

http://onsemi.com

PACKAGE DIMENSIONS

SOIC 8, 150 mils

CASE 751BD−01

ISSUE O

E1 E

PIN # 1

IDENTIFICATION

TOP VIEW

SIDE VIEW END VIEW

Notes:

(1) All dimensions are in millimeters. Angles in degrees.

(2) Complies with JEDEC MS-012.

SYMBOL MIN NOM MAX

0º 8º

0.10

0.33

0.19

0.25

4.80

5.80

3.80

1.27 BSC

1.75

0.25

0.51

0.25

0.50

5.00

6.20

4.00

L0.40 1.27

1.35

ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B

http://onsemi.com

Table 8. ORDERING INFORMATION

Part Number Marking Package Type Temperature

ASM3P2811AF−08SR 3P2811AFS SOIC – Tape & Reel, Pb free Commercial

ASM3P2811AF−08ST 3P2811AFS SOIC – Tube, Pb free Commercial

ASM3P2811AF−08TR 3P2811AFT TSSOP – Tape & Reel, Pb free Commercial

ASM3P2811AF−08TT 3P2811AFT TSSOP – Tube, Pb free Commercial

ASM3P2811BF−08SR 3P2811BFS SOIC – Tape & Reel, Pb free Commercial

ASM3P2811BF−08ST 3P2811BFS SOIC – Tube, Pb free Commercial

ASM3P2811BF−08TR 3P2811BFT TSSOP – Tape & Reel, Pb free Commercial

ASM3P2811BF−08TT 3P2811BFT TSSOP – Tube, Pb free Commercial

ASM3P2812AF−08SR 3P2812AFS SOIC – Tape & Reel, Pb free Commercial

ASM3P2812AF−08ST 3P2812AFS SOIC – Tube, Pb free Commercial

ASM3P2812AF−08TR 3P2812AFT TSSOP – Tape & Reel, Pb free Commercial

ASM3P2812AF−08TT 3P2812AFT TSSOP – Tube, Pb free Commercial

ASM3P2812BF−08SR 3P2812BFS SOIC – Tape & Reel, Pb free Commercial

ASM3P2812BF−08ST 3P2812BFS SOIC – Tube, Pb free Commercial

ASM3P2812BF−08TR 3P2812BFT TSSOP – Tape & Reel, Pb free Commercial

ASM3P2812BF−08TT 3P2812BFT TSSOP – Tube, Pb free Commercial

ASM3P2814AF−08SR 3P2814AFS SOIC – Tape & Reel, Pb free Commercial

ASM3P2814AF−08ST 3P2814AFS SOIC – Tube, Pb free Commercial

ASM3P2814AF−08TR 3P2814AFT TSSOP – Tape & Reel, Pb free Commercial

ASM3P2814AF−08TT 3P2814AFT TSSOP – Tube, Pb free Commercial

ASM3P2814BF−08SR 3P2814BFS SOIC – Tape & Reel, Pb free Commercial

ASM3P2814BF−08ST 3P2814BFS SOIC – Tube, Pb free Commercial

ASM3P2814BF−08TR 3P2814BFT TSSOP – Tape & Reel, Pb free Commercial

ASM3P2814BF−08TT 3P2814BFT TSSOP – Tube, Pb free Commercial

ASM3I2811AF−08SR 3I2811AFS SOIC – Tape & Reel, Pb free Industrial

ASM3I2811AF−08ST 3I2811AFS SOIC – Tube, Pb free Industrial

ASM3I2811AF−08TR 3I2811AFT TSSOP – Tape & Reel, Pb free Industrial

ASM3I2811AF−08TT 3I2811AFT TSSOP – Tube, Pb free Industrial

ASM3I2811BF−08SR 3I2811BFS SOIC – Tape & Reel, Pb free Industrial

ASM3I2811BF−08ST 3I2811BFS SOIC – Tube, Pb free Industrial

ASM3I2811BF−08TR 3I2811BFT TSSOP – Tape & Reel, Pb free Industrial

ASM3I2811BF−08TT 3I2811BFT TSSOP – Tube, Pb free Industrial

ASM3I2812AF−08SR 3I2812AFS SOIC – Tape & Reel, Pb free Industrial

ASM3I2812AF−08ST 3I2812AFS SOIC – Tube, Pb free Industrial

ASM3I2812AF−08TR 3I2812AFT TSSOP – Tape & Reel, Pb free Industrial

ASM3I2812AF−08TT 3I2812AFT TSSOP – Tube, Pb free Industrial

ASM3I2812BF−08SR 3I2812BFS SOIC – Tape & Reel, Pb free Industrial

ASM3I2812BF−08ST 3I2812BFS SOIC − Tube, Pb free Industrial

ASM3I2812BF−08TR 3I2812BFT TSSOP – Tape & Reel, Pb free Industrial

ASM3I2812BF−08TT 3I2812BFT TSSOP – Tube, Pb free Industrial

ASM3I2814AF−08SR 3I2814AFS SOIC − Tape & Reel, Pb free Industrial

ASM3I2814AF−08ST 3I2814AFS SOIC − Tube, Pb free Industrial

ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B

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Table 8. ORDERING INFORMATION (continued)

Part Number TemperaturePackage TypeMarking

ASM3I2814AF−08TR 3I2814AFT TSSOP – Tape & Reel, Pb free Industrial

ASM3I2814AF−08TT 3I2814AFT TSSOP – Tube, Pb free Industrial

ASM3I2814BF−08SR 3I2814BFS SOIC − Tape & Reel, Pb free Industrial

ASM3I2814BF−08ST 3I2814BFS SOIC − Tube, Pb free Industrial

ASM3I2814BF−08TR 3I2814BFT TSSOP – Tape & Reel, Pb free Industrial

ASM3I2814BF−08TT 3I2814BFT TSSOP – Tube, Pb free Industrial

ASM3P2811AG−08SR 3P2811AGS SOIC – Tape & Reel, Green Commercial

ASM3P2811AG−08ST 3P2811AGS SOIC – Tube, Green Commercial

ASM3P2811AG−08TR 3P2811AGT TSSOP – Tape & Reel, Green Commercial

ASM3P2811AG−08TT 3P2811AGT TSSOP – Tube, Green Commercial

ASM3P2811BG−08SR 3P2811BGS SOIC – Tape & Reel, Green Commercial

ASM3P2811BG−08ST 3P2811BGS SOIC – Tube, Green Commercial

ASM3P2811BG−08TR 3P2811BGT TSSOP – Tape & Reel, Green Commercial

ASM3P2811BG−08TT 3P2811BGT TSSOP – Tube, Green Commercial

ASM3P2812AG−08SR 3P2812AGS SOIC – Tape & Reel, Green Commercial

ASM3P2812AG−08ST 3P2812AGS SOIC – Tube, Green Commercial

ASM3P2812AG−08TR 3P2812AGT TSSOP – Tape & Reel, Green Commercial

ASM3P2812AG−08TT 3P2812AGT TSSOP – Tube, Green Commercial

ASM3P2812BG−08SR 3P2812BGS SOIC – Tape & Reel, Green Commercial

ASM3P2812BG−08ST 3P2812BGS SOIC – Tube, Green Commercial

ASM3P2812BG−08TR 3P2812BGT TSSOP – Tape & Reel, Green Commercial

ASM3P2812BG−08TT 3P2812BGT TSSOP – Tube, Green Commercial

ASM3P2814AG−08SR 3P2814AGS SOIC – Tape & Reel, Green Commercial

ASM3P2814AG−08ST 3P2814AGS SOIC – Tube, Green Commercial

ASM3P2814AG−08TR 3P2814AGT TSSOP – Tape & Reel, Green Commercial

ASM3P2814AG−08TT 3P2814AGT TSSOP – Tube, Green Commercial

ASM3P2814BG−08SR 3P2814BGS SOIC – Tape & Reel, Green Commercial

ASM3P2814BG−08ST 3P2814BGS SOIC – Tube, Green Commercial

ASM3P2814BG−08TR 3P2814BGT TSSOP – Tape & Reel, Green Commercial

ASM3P2814BG−08TT 3P2814BGT TSSOP – Tube, Green Commercial

ASM3I2811AG−08SR 3I2811AGS SOIC – Tape & Reel, Green Industrial

ASM3I2811AG−08ST 3I2811AGS SOIC – Tube, Green Industrial

ASM3I2811AG−08TR 3I2811AGT TSSOP – Tape & Reel, Green Industrial

ASM3I2811AG−08TT 3I2811AGT TSSOP – Tube, Green Industrial

ASM3I2811BG−08SR 3I2811BGS SOIC – Tape & Reel, Green Industrial

ASM3I2811BG−08ST 3I2811BGS SOIC – Tube, Green Industrial

ASM3I2811BG−08TR 3I2811BGT TSSOP – Tape & Reel, Green Industrial

ASM3I2811BG−08TT 3I2811BGT TSSOP – Tube, Green Industrial

ASM3I2812AG−08SR 3I2812AGS SOIC – Tape & Reel, Green Industrial

ASM3I2812AG−08ST 3I2812AGS SOIC – Tube, Green Industrial

ASM3I2812AG−08TR 3I2812AGT TSSOP – Tape & Reel, Green Industrial

ASM3I2812AG−08TT 3I2812AGT TSSOP – Tube, Green Industrial

ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B

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Table 8. ORDERING INFORMATION (continued)

Part Number TemperaturePackage TypeMarking

ASM3I2812BG−08SR 3I2812BGS SOIC – Tape & Reel, Green Industrial

ASM3I2812BG−08ST 3I2812BGS SOIC − Tube, Green Industrial

ASM3I2812BG−08TR 3I2812BGT TSSOP – Tape & Reel, Green Industrial

ASM3I2812BG−08TT 3I2812BGT TSSOP – Tube, Green Industrial

ASM3I2814AG−08SR 3I2814AGS SOIC − Tape & Reel, Green Industrial

ASM3I2814AG−08ST 3I2814AGS SOIC − Tube, Green Industrial

ASM3I2814AG−08TR 3I2814AGT TSSOP – Tape & Reel, Green Industrial

ASM3I2814AG−08TT 3I2814AGT TSSOP – Tube, Green Industrial

ASM3I2814BG−08SR 3I2814BGS SOIC − Tape & Reel, Green Industrial

ASM3I2814BG−08ST 3I2814BGS SOIC − Tube, Green Industrial

ASM3I2814BG−08TR 3I2814BGT TSSOP – Tape & Reel, Green Industrial

ASM3I2814BG−08TT 3I2814BGT TSSOP – Tube, Green Industrial

ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice

to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All

operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights

nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications

intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should

Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,

and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death

associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal

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ASM3P2811A/D

PUBLICATION ORDERING INFORMATION

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