Datasheet P2811, P2812, P2814 Datasheet (Alliance Semiconductor)

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Low-Power EMI Reduction IC

Features

 FCC approved method of EMI attenuation

 Provides up to 15 dB EMI reduction

 Generates 1X, 2X, and 4X low EMI spread spectrum

clock of the input frequency

 1X: P2811, 2X: P2812, 4X: P2814

 Optimized for input frequency range from 10 to 40

MHz P2811: 10 to 40 MHz P2812: 10 to 40 MHz

P2814: 10 to 40 MHz

 Internal loop filter minimizes external components

and board space

 Selectable spread options: Down Spread and Center

Spread

 Low inherent cycle-to-cycle jitter

 Eight spread % selections: ±0.625% to –3.5%

 3.3 V operating voltage

 CMOS/TTL compatible inputs and outputs

 Pinout compatible with Cypress CY25811,

CY25812, and CY25814

 Products available for industrial temperature range

 Available in 8-pin SOIC and TSSOP

Product Description

The P28xx is a versatile spread spectrum frequency
modulator designed specifically for input clock frequencies
from 10 to 40 MHz (see Input/Output Frequency Range
Selections). The P28xx can generate an EMI reduced clock
from crystal, ceramic resonator, or system clock. The
P28xx-A and P28xx-B offer various combinations of spread
options and percentage deviations (see Output Frequency

Block Diagram

Deviation and Spread Option Selections section). These
combinations include Down Spread, Center Spread and
percentage deviation range from ±0.625% to -3.50%.

The P28xx reduces electromagnetic interference (EMI) at
the clock source, allowing a system wide EMI reduction for
all the down stream clocks and data dependent signals.
The P28xx 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 P28xx modulates the output of a single 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”.

The P28xx uses the most efficient and optimized

modulation profile approved by the FCC and is

implemented by using a proprietary all-digital method.

Applications

The P28xx is targeted towards EMI management for

memory interfaces in mobile graphic chipsets and high-

speed digital applications such as PC peripheral devices,

consumer electronics, and embedded controller systems.

Alliance Semiconductor

2575, Augustine Drive • Santa Clara, CA • Tel: [phone] • Fax: [phone] • www.alsc.com

Notice: The information in this document is subject to change without notice.

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Pin Configuration

Pin Description

Pin# Pin Name Type Description

1

2

3

4

5

6

7

8

Input/Output Frequency Range Selections

Pin 6

FRS

XIN I Connect to externally generated clock signal or crystal.

VSS P Ground Connection. Connect to system ground.

D_C I Digital logic input used to select Down (LOW) or Center (HIGH) Spread

Options (see Output Frequency Deviation and Spread Option Selections).
This pin has an internal pull-up resistor.

SRS I Spread Range Selection. Digital logic input used to select frequency

deviation (see Output Frequency Deviation and Spread Option Selections).
This pin has an internal pull-up resistor.

ModOut O Spread Spectrum clock output (see Input/Output Frequency Range

Selections and Output Frequency Deviation and Spread Option Selections).

FRS I Frequency Range Selection. Digital logic input used to select input fre-

quency range (see Input/Output Frequency Range Selections). This pin has
an internal pull-up resistor.

VDD P Connect to +3.3 V

XOUT I Connect to crystal. No connect if externally generated clock signal is used.

P2811 (1X) P2812 (2X) P2814 (4X)

Input

(MHz)

0 10-20 10-20 10-20 20-40 10-20 40-80

1 20-40 20-40 20-40 40-80 20-40 80-160

Output

(MHz)

Part number

Input

(MHz)

Output

(MHz)

Input

(MHz)

Output

(MHz)

Modulation

rate

Input frequency

/ 448

Input frequency

/ 896

Notice: The information in this document is subject to change without notice.

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Output Frequency Deviation and Spread Option Selections

Part number Pin 3 D_C Pin 4 SRS

0 0 -2.50% (Down)

P2811/12/14A

0 1 -3.50% (Down)

1 0 +/-1.25% (Center)

1 1 +/-1.75% (Center)

0 0 -1.25% (Down)

P2811/12/14B

0 1 -1.75% (Down)

1 0 +/-0.625% (Center)

1 1 +/-0.875% (Center)

Absolute Maximum Ratings

Symbol Parameter Rating Unit

VDD, VIN Voltage on any pin with respect to GND

T

Storage temperature

STG

TA Operating temperature

DC Electrical Characteristics

3.3 V, 25° C

Symbol Parameter Min Typ Max Unit

VIL Input Low Voltage GND – 0.3 – 0.8 V

VIH Input High Voltage – – VDD + 0.3 V

IIL

Input low Current (inputs
D_C, SRS, and FRS)

-60.00 – -20.00 µA

IIH Input High Current – – 1.00 µA

I

XOL

I

XOH

VOL

VOH

IDD

XOUT Output Low Current
(@ 0.4V, VDD = 3.3V)
XOUT Output High Current
(@ 2.5V, VDD = 3.3V)
Output Low Voltage
(VDD=3.3V, IOL = 20 mA)
Output High Voltage
(VDD=3.3V, IOH = 20 mA)
Static Supply Current
Standby Mode

2.00 – 12.00 mA

– – 12.00 mA

– – 0.4 V

– – 2.8 V

– 4.5 – mA

Dynamic Supply Current

ICC

Normal Mode (3.3V and 25

7.1 fIN-min – 13.9 f

pF probe loading)

VDD Operating Voltage – 3.3 – V

tON

Z

Clock Output Impedance – 50 – Ω

OUT

Power Up Time (First locked
clock cycle after power up)

– 0.18 – mS

Output frequency deviation and

spread option

-0.5 to + 7.0 V

-65 to +125 °C

0 to 70 °C

mA

IN-max

Notice: The information in this document is subject to change without notice.

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AC Electrical Characteristics

3.3 V, 25° C

Symbol Parameter Min Typ Max Unit

f

Input frequency P2811/12/14 10 – 40 MHz

IN

f

Output frequency P2811 10 – 40 MHz

OUT

t

1

LH

t

1

HL

t

Jitter (cycle to cycle) -200 – 200 ps

JC

t

Output duty cycle 45 50 55 %

D

1. tLH and tHL are measured into a capacitive load of 15 pF

Output frequency P2812 20 – 80 MHz

Output frequency P2814 40 – 160 MHz
Output rise time (measured at

0.8V to 2.0V)
Output fall time (measured at

2.0V to 0.8V)

0.69

0.66

ns

ns

Notice: The information in this document is subject to change without notice.

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Package Information

Mechanical Package Outline 8-Pin SOIC

Dimensions in inches Dimensions in millimeters

Symbol

Min Nor Max Min Nor Max

A 0.057 0.064 0.071 1.45 1.63 1.80

A1 0.004 0.007 0.010 0.10 0.18 0.25

A2 0.053 0.061 0.069 1.35 1.55 1.75

B 0.012 0.016 0.020 0.31 0.41 0.51

C 0.004 0.006 0.01 0.10 0.15 0.25

D 0.186 0.194 0.202 4.72 4.92 5.12

E 0.148 0.156 0.164 3.75 3.95 4.15

e 0.050 BSC 1.27 BSC

H 0.224 0.236 0.248 5.70 6.00 6.30

L 0.012 0.020 0.028 0.30 0.50 0.70

a 0° 5° 8° 0° 5° 8°

Note: Controlling dimensions are millimeters
SOIC – 0.074 grams unit weight

Notice: The information in this document is subject to change without notice.

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Mechanical Package Outline 8-Pin TSSOP

Symbol Min Nor Max Min Nor Max

A

A1 0.002

A2 0.031 0.039 0.041 0.80 1.00 1.05

B 0.007 0.012 0.19 0.30

C 0.004 0.008 0.09 0.20

D 0.114 0.118 0.122 2.90 3.00 3.10

E 0.169 0.173 0.177 4.30 4.40 4.50

e 0.026 BSC 0.65 BSC

H 0.244 0.252 0.260 6.20 6.40 6.60

L 0.018 0.024 0.030 0.45 0.60 0.75

a 0°

Dimensions in inches Dimensions in millimeters

5°

0.047

0.006 0.05

8° 0°

5°

1.10

0.15

8°

Note: Controlling dimensions are millimeters
TSSOP – 0.034 grams unit weight

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p

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Ordering Codes

Part Number Marking Package Type Qty per reel Temperature

P2811A-08ST P2811A 8-pin SOIC, tube 0 to 70

P2812A-08ST P2812A 8-pin SOIC, tube 0 to 70

P2814A-08ST P2814A 8-pin SOIC, tube 0 to 70

P2811A-08SR P2811A 8-pin SOIC, tape reel 2,500 0 to 70

P2812A-08SR P2812A 8-pin SOIC, tape reel 2,500 0 to 70

P2814A-08SR P2814A 8-pin SOIC, tape reel 2,500 0 to 70

P2811A-08TT P2811A 8-pin TSSOP, tube 0 to 70

P2812A-08TT P2812A 8-pin TSSOP, tube 0 to 70

P2814A-08TT P2814A 8-pin TSSOP, tube 0 to 70

P2811A-08TR P2811A 8-pin TSSOP, tape reel 2,500 0 to 70

P2812A-08TR P2812A 8-pin TSSOP, tape reel 2,500 0 to 70

P2814A-08TR P2814A 8-pin TSSOP, tape reel 2,500 0 to 70

Device Ordering Information

X 28XX X- 08 XX

Package:
ST – SOIC, TUBE
SR - SOIC, T/R
TT – TSSOP, TUBE
TR - TSSOP, T/R

Pin Count

F = Pb FREE

DEVICE NUMBER

Flow:
P = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (-25°C to 85°C)
A = Automotive Tem

Licensed under US patent Nos 5,488,627 and 5,631,920.
Preliminary datasheet. Specification subject to change without notice.

erature Range (-40°C to 125°C)

Notice: The information in this document is subject to change without notice.

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Alliance Semiconductor Corporation
2595, Augustine Drive,
Santa Clara, CA 95054
Tel# [phone]
Fax: [phone]
www.alsc.com

© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are
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
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potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or
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described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products
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Copyright © Alliance Semiconductor
All Rights Reserved
Preliminary Information
Part Number: P2811/12/14
Document Version:

Notice: The information in this document is subject to change without notice.

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