approved method attenuation. Generates spread spectrum input clock fre

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approved method attenuation. Generates spread spectrum input clock fre

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ASM3P2531A
approved method attenuation. Generates spread spectrum input clock frequency. Optimized input frequency range between 35MHz 55MHz. Internal loop filter minimizes external components board space. Frequency Deviation: ±1.65%. inherent cycle-to-cycle jitter. operating voltage. CMOS/TTL compatible inputs outputs. Ultra power CMOS design: 5.50 @3.3 Supports notebook other timing controller applications. Available 8-pin SOIC TSSOP.
dependent signals. allows significant system cost savings reducing number circuit board layers shielding traditionally required pass regulations. ASM3P2531A modulates output single order spread bandwidth synthesized clock, thereby decreasing peak amplitudes harmonics. This results significantly lower system compared typical narrow band signal produced oscillators most clock generators. Lowering increasing signal's bandwidth called spread spectrum clock generation. ASM3P2531A uses most efficient optimized modulation profile approved implemented using proprietary all-digital method.
Product Description
ASM3P2531A versatile spread spectrum frequency modulator designed specifically wide range clock frequencies. reduces electromagnetic interference (EMI) clock source allowing systemwide reduction downstream clock data Applications ASM3P2531A targeted toward notebook chip other displays using LVDS interface, peripheral devices, embedded systems
Block Diagram
STOP
Modulation CLKIN Crystal Oscillator
Frequency Divider Feedback Divider
Phase Detector
Loop Filter
Output Divider MODOUT
Frequency Reduction
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Configuration
ASM3P2531A
CLKIN ModOUT
ASM3P2531A
STOP
Spread Range Selection, CLKIN frequency Description Pin# Name CLKIN ModOUT STOP Type External reference frequency input. Power supply entire chip. Ground entire chip. Spread spectrum clock output reference output. Refer Standby Mode Selection. Active signal. When HIGH, enables ModOUT when LOW, ModOUT would LOW. connect. connect. connect. Description Spreading range ±1.65% Modulation rate (CLKIN/1280)
Frequency Reduction
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Schematic Typical Application
ASM3P2531A
Input clock 35MHz 55MHz 0.1µF Ferrite Bead
ASM3P3531A CLKIN
ModOUT reduced clock output 35MHz 55MHz
STOP
either pull-up pulldown resistors with
Frequency Reduction
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Absolute Maximum Ratings Symbol VDD, TSTG Parameter Voltage with respect Storage temperature Operating temperature Rating -0.5 +7.0 +125
ASM3P2531A
Unit
Electrical Characteristics Symbol ZOUT Input voltage Input high voltage Input current Input high current Output voltage Output high voltage Normal mode Dynamic supply current Operating voltage Power-up time (first locked cycle after power Clock output impedance loading loading fIN-min 0.18 fIN-typ fIN-max 13.6 Parameter Unit
Static supply current standby mode
Electrical Characteristics Symbol fOUT Input frequency Output frequency Output rise time Output fall time Jitter (cycle cycle) Output duty cycle Measured Measured 3.75 Measured Measured 3.75 Parameter 0.75 0.75 Unit
Frequency Reduction
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ASM3P2531A
Package Information 8-Pin SOIC
Symbol
Dimensions inches 0.069 0.010 0.022 0.012 0.197 0.158 0.244
Dimensions millimeters 1.35 0.10 0.33 0.18 4.78 3.80 5.80 1.27 0.40 0.89 1.75 0.25 0.53 0.27 5.00 4.01 6.20
0.053 0.004 0.013 0.007 0.188 0.150 0.228
0.050 0.016 0.035
Frequency Reduction
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Package Information
ASM3P2531A
8-Pin TSSOP
Symbol
Dimensions inches 0.002 0.033 0.008 0.004 0.114 0.169 0.020 0.043 0.006 0.037 0.012 0.008 0.122 0.177 0.028
Dimensions millimeters 0.05 0.85 0.19 0.09 2.90 6.40 4.30 0.65 0.50 0.70 4.50 1.10 0.15 0.95 0.30 0.20 3.10
0.252 0.026
Frequency Reduction
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ASM3P2531A
Ordering Information Ordering Code ASM3P2531A-08ST ASM3P2531A-08SR ASM3I2531A-08ST ASM3I2531A-08SR ASM3P2531A-08TT ASM3P2531A-08TR ASM3I2531A-08TT ASM3I2531A-08TR Package Type 8-pin 150mil SOIC -TUBE 8-pin 150-mil SOIC -TAPE REEL 8-pin 150mil SOIC -TUBE 8-pin 150-mil SOIC -TAPE REEL 8-pin 4.4mm TSSOP -TUBE 8-pin 4.4mm TSSOP -TAPE REEL 8-pin 4.4mm TSSOP -TUBE 8-pin 4.4mm TSSOP TAPE REEL Operating Range Commercial Commercial Industrial Industrial Commercial Commercial Industrial Industrial
Ordering Information
SOT23/T/R TSSOP, TUBE TSSOP, TVSOP, TUBE TVSOP, SOIC, TUBE SOIC, QFN, QFN, TUBE BGA, TUBE BGA,
COUNT
PART NUMBER
Automotive
Industrial
Commercial
reserved based Reduction support products Zero Delay Buffer
power management power management power management performance reserved
Alliance Semiconductor Mixed Signal Product
Frequency Reduction
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ASM3P2531A
Alliance Semiconductor Corporation 2595, Augustine Drive, Santa Clara, 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com
Copyright Alliance Semiconductor Rights Reserved Preliminary Information Part Number: ASM3P2531A Document Version: v1.0
Copyright 2003 Alliance Semiconductor Corporation. rights reserved. three-point logo, name Intelliwatt trademarks registered trademarks Alliance. other brand product names trademarks their respective companies. Alliance reserves right make changes this document products time without notice. Alliance assumes responsibility errors that appear this document. data contained herein represents Alliance's best data and/or estimates time issuance. Alliance reserves right change correct this data time, without notice. product described herein under development, significant changes these specifications possible. information this product data sheet intended general descriptive information potential customers users, intended operate provide, guarantee warrantee user customer. Alliance does assume responsibility liability arising application product described herein, disclaims express implied warranties related sale and/or Alliance products including liability warranties related fitness particular purpose, merchantability, infringement intellectual property rights, except express agreed Alliance's Terms Conditions Sale (which available from Alliance). sales Alliance products made exclusively according Alliance's Terms Conditions Sale. purchase products from Alliance does convey license under patent rights, copyrights; mask works rights, trademarks, other intellectual property rights Alliance third parties. Alliance does authorize products critical components life-supporting systems where malfunction failure reasonably expected result significant injury user, inclusion Alliance products such life-supporting systems implies that manufacturer assumes risk such agrees indemnify Alliance against claims arising from such use.
Frequency Reduction
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