P2811 ALSC [Alliance Semiconductor Corporation], P2811 Datasheet

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P2811

Manufacturer Part Number
P2811
Description
Low-Power EMI Reduction IC
Manufacturer
ALSC [Alliance Semiconductor Corporation]
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
P2811A
Manufacturer:
MURATA
Quantity:
22 562
October 2003
rev
Features
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.
P28xx-A and P28xx-B offer various combinations of spread
options and percentage deviations (see Output Frequency
Block Diagram
2575, Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com
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
CY25812, and CY25814
Products available for industrial temperature range
Available in 8-pin SOIC and TSSOP
compatible
with
Notice: The information in this document is subject to change without notice.
Cypress
Low-Power EMI Reduction IC
Alliance Semiconductor
CY25811,
The
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.
signal’s bandwidth is called “spread spectrum clock
generation”.
The P28xx uses the most efficient and optimized
modulation
implemented by using a proprietary all-digital method.
Applications
memory interfaces in mobile graphic chipsets and high-
speed digital applications such as PC peripheral devices,
consumer electronics, and embedded controller systems.
The P28xx is targeted towards EMI management for
profile
approved
Lowering EMI by increasing a
by
P2811/12/14
the
FCC
and
is

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P2811 Summary of contents

Page 1

... 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 MHz P2811 MHz P2812 MHz P2814 MHz Internal loop filter minimizes external components and board space Selectable spread options: Down Spread and Center ...

Page 2

... Input/Output Frequency Range Selections). This pin has an internal pull-up resistor. VDD P Connect to +3 XOUT I Connect to crystal. No connect if externally generated clock signal is used. 8 Input/Output Frequency Range Selections Pin 6 P2811 (1X) Input Output FRS (MHz) 0 10-20 1 20-40 Notice: The information in this document is subject to change without notice. Description Part number ...

Page 3

... Low Power EMI Reduction IC P2811/12/14 spread option -2.50% (Down) -3.50% (Down) +/-1.25% (Center) +/-1.75% (Center) -1.25% (Down) -1.75% (Down) +/-0.625% (Center) +/-0.875% (Center) Unit V °C °C Max Unit 0 0 -20.00 µA 1.00 µ ...

Page 4

... October 2003 rev AC Electrical Characteristics 3.3 V, 25° C Symbol Parameter f Input frequency P2811/12/ Output frequency P2811 OUT Output frequency P2812 Output frequency P2814 Output rise time (measured 0.8V to 2.0V) Output fall time (measured 2.0V to 0.8V) t Jitter (cycle to cycle Output duty cycle D 1 ...

Page 5

... Note: Controlling dimensions are millimeters SOIC – 0.074 grams unit weight Notice: The information in this document is subject to change without notice. Dimensions in millimeters Max Min Nor Max 0.071 1.45 1.63 1.80 0.010 0.10 0.18 0.25 0.069 1.35 1.55 1.75 0.020 0.31 0.41 0.51 0.01 0.10 0.15 0.25 0.202 4.72 4.92 5.12 0.164 3.75 3.95 4.15 1.27 BSC 0.248 5.70 6.00 6.30 0.028 0.30 0.50 0.70 8° 0° 5° 8° Low Power EMI Reduction IC P2811/12/ ...

Page 6

... TSSOP – 0.034 grams unit weight Notice: The information in this document is subject to change without notice. Dimensions in millimeters Max Min Nor Max 0.047 1.10 0.006 0.05 0.15 0.041 0.80 1.00 1.05 0.012 0.19 0.30 0.008 0.09 0.20 0.122 2.90 3.00 3.10 0.177 4.30 4.40 4.50 0.65 BSC 0.260 6.20 6.40 6.60 0.030 0.45 0.60 0.75 5° 8° 0° 8° Low Power EMI Reduction IC P2811/12/ ...

Page 7

... SOIC, tube P2814A 8-pin SOIC, tube P2811A 8-pin SOIC, tape reel P2812A 8-pin SOIC, tape reel P2814A 8-pin SOIC, tape reel P2811A 8-pin TSSOP, tube P2812A 8-pin TSSOP, tube P2814A 8-pin TSSOP, tube P2811A 8-pin TSSOP, tape reel P2812A 8-pin TSSOP, tape reel ...

Page 8

... Alliance against all claims arising from such use. Notice: The information in this document is subject to change without notice. Copyright © Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: P2811/12/14 Document Version: Low Power EMI Reduction IC P2811/12/ ...

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