ICS8OSK270 cost integrated clock synthesizer solution replacing crysta

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ICS8OSK270 cost integrated clock synthesizer solution replacing crysta

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FIXED SPREAD CLOCK GENERATOR Description
ICS8OSK270 cost integrated clock synthesizer solution replacing crystals crystal oscillators. ICS8OSK270 generates very accurate 27.00 fixed clock output, 27.00 spread spectrum clock output from 14.31818 reference clock crystal input.
ICS8OSK270
Features
14.31818 crystal clock input MHz_Fixed clock output non-spread with
synthesis error
MHz_SS clock output with selectable spread
spectrum reduction
Output duty cycle 45/55% (worst case) Advanced, low-power CMOS process Industrial temperature range (-40 85°C) Packaged 8-pin MSOP (3.00 body) RoHS (green) RoHS (green lead free) compliant packaging
Block Diagram
14.318 crystal clock input X1/ICLK Crystal Oscillator/ Clock Buffer
27M_Fixed 27M_SS
External capacitors required with crystal input
IDT/ ICS27 FIXED SPREAD CLOCK GENERATOR
ICS8OSK270
050406
ICS8OSK270 FIXED SPREAD CLOCK GENERATOR
SSCG
Assignment
Spread Spectrum Percentage Selection Table
27M_SS Down Spread
-0.5% -1.5%
Descriptions
Number
Name
X1/ICLK 27M_FIXED 27M_SS
Type
Input Power Input Output Output Output Power Power Connect +3.3
Description
Spread Spectrum percentage select table above. Crystal connection. Connect to14.31818 crystal clock input. Crystal connection. Connect to14.31818 crystal. fixed clock output spread spectrum clock output Connect ground. Connect +3.3
IDT/ ICS27 FIXED SPREAD CLOCK GENERATOR
ICS8OSK270
050406
ICS8OSK270 FIXED SPREAD CLOCK GENERATOR
SSCG
External Components
Decoupling Capacitor
with high-performance mixed-signal ICS8OSK270 must isolated from system power supply noise perform optimally. decoupling capacitor 0.01µF must connected between each ground plane.
Layout Recommendations
optimum device performance lowest output phase noise, following guidelines should observed. 0.01µF decoupling capacitors should mounted component side board close possible. vias should used between decoupling capacitors pins. trace pins should kept short possible, should trace ground via. external crystal should mounted just next device with short traces. traces should routed next each other with minimum spaces, instead they should separated away from other traces. minimize EMI, series termination resistor needed) should placed close clock output. optimum layout with components same side board, minimizing vias through other signal layers. Other signal traces should routed away from ICS8OSK270. This includes signal traces just underneath device, layers adjacent ground plane layer used device.
Series Termination Resistor
Clock output traces over inch should series termination. series terminate trace commonly used trace impedance), place resistor series with clock line, close clock output possible. nominal impedance clock output
Crystal Load Capacitors
device crystal connections should include pads small capacitors from ground from ground. These capacitors used adjust stray capacitance board match nominally required crystal load capacitance. Because load capacitance only increased this trimming process, important keep stray capacitance minimum using very short traces (and vias) between crystal device. Crystal capacitors must connected from each pins ground. value these crystal caps should equal pF)*2. this equation, crystal load capacitance Example: crystal with load capacitance, each crystal capacitor would [(16-6) 20].
IDT/ ICS27 FIXED SPREAD CLOCK GENERATOR
ICS8OSK270
050406
ICS8OSK270 FIXED SPREAD CLOCK GENERATOR
SSCG
Absolute Maximum Ratings
Stresses above ratings listed below cause permanent damage ICS8OSK270. These ratings, which standard values commercially rated parts, stress ratings only. Functional operation device these other conditions above those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect product reliability. Electrical parameters guaranteed only over recommended operating temperature range.
Item
Supply Voltage, Inputs Outputs Storage Temperature Junction Temperature Soldering Temperature (HBM) (Moisture Sensitivity Level) -0.5
Rating
-0.5 VDD+0.5 -0.5 2.5V+0.5 +150°C 125°C 260°C 2000V min.
Recommended Operation Conditions
Parameter
Ambient Operating Temperature Power Supply Voltage (measured respect GND)
Min.
+3.135
Typ.
Max.
+3.465
Units
Electrical Characteristics
Unless stated otherwise, ±5%, Ambient Temp -40°C +85°C
Parameter
Operating Voltage Supply Current Input High Voltage Input Voltage Output High Voltage Output Voltage Load Capacitance,
Symbol
Conditions
load
Min.
3.135
Typ.
Max.
3.465
Units
internal load capacitance
IDT/ ICS27 FIXED SPREAD CLOCK GENERATOR
ICS8OSK270
050406
ICS8OSK270 FIXED SPREAD CLOCK GENERATOR
SSCG
Electrical Characteristics
Unless stated otherwise, ±5%, Ambient Temperature -40°C +85°C
Parameter
Input Frequency Output Rise Time Output Fall Time Output Impedance Output Clock Duty Cycle Frequency Synthesis Error Short Term Jitter Long Term Jitter Power-up Time
Symbol
Conditions
80%, Note 20%, Note VO=VDD/2 VDD/2, Note 27M_FIXED Cycle-to-Cycle 27M_FIXED, n=1000
Min.
Typ.
14.31818
Max. Units
From minimum outputs stable
Note Measured with load.
IDT/ ICS27 FIXED SPREAD CLOCK GENERATOR
ICS8OSK270
050406
ICS8OSK270 FIXED SPREAD CLOCK GENERATOR
SSCG
Package Outline Package Dimensions (8-pin MSOP, 3.00 Body)
Package dimensions kept current with JEDEC Publication
Millimeters Symbol Inches*
AREA
-1.10 0.15 0.79 0.97 0.22 0.38 0.08 0.23 3.00 BASIC 4.90 BASIC 3.00 BASIC 0.65 Basic 0.40 0.80 0.10
-0.043 0.006 0.031 0.038 0.008 0.015 0.003 0.009 0.118 BASIC 0.193 BASIC 0.118 BASIC 0.0256 Basic 0.016 0.032 0.004
*For reference only. Controlling dimensions
Ordering Information
Part Order Number
ICS8OSK270GILF ICS8OSK270GILFT
Marking
Shipping Packaging
Tubes Tape Reel
Package
8-pin MSOP 8-pin MSOP
Temperature
+85° +85°
Parts that ordered with "LF" suffix part number Pb-Free configuration RoHS compliant. While information presented herein been checked both accuracy reliability, Integrated Circuit Systems (ICS) assumes responsibility either infringement patents other rights third parties, which would result from use. other circuits, patents, licenses implied. This product intended normal commercial applications. other applications such those requiring extended temperature range, high reliability, other extraordinary environmental requirements recommended without additional processing ICS. reserves right change circuitry specifications without notice. does authorize warrant product life support devices critical medical instruments.
IDT/ ICS27 FIXED SPREAD CLOCK GENERATOR
ICS8OSK270
050406
ICS8OSK270 FIXED SPREAD CLOCK GENERATOR
SSCG
Revision History
Rev.
Originator
J.Sarma J.Sarma J.Sarma
Date
03/02/06 03/08/06 05/04/06
Description Change
Released from Proposal Preliminary; added TSSOP package information. Corrected part number. 8MSOP package part ICS8OSK270AGILF 8TSSOP package part ICS8OSK270GILF. Deleted TSSOP package availability-8MSOP package only.
IDT/ ICS27 FIXED SPREAD CLOCK GENERATOR
ICS8OSK270
050406
ICS8OSK270 FIXED SPREAD CLOCK GENERATOR
SSCG
Innovate with accelerate your future networks. Contact:
www.IDT.com
Sales
800-345-7015 408-284-8200 Fax: 408-284-2775
Tech Support
<product line email> <product line phone>
Corporate Headquarters
Integrated Device Technology, Inc. 6024 Silver Creek Valley Road Jose, 95138 United States 7015 +408 8200 (outside U.S.)
Asia Pacific Japan
Integrated Device Technology Singapore (1997) Pte. Ltd. Reg. 199707558G Orchard Road #20-03 Wisma Atria Singapore 238877 5505
Europe
Europe, Limited Prime House Barnett Wood Lane Leatherhead, Surrey United Kingdom KT22 1372
2006 Integrated Device Technology, Inc. rights reserved. Product specifications subject change without notice. logo trademarks Integrated Device Technology, Inc. Accelerated Thinking service mark Integrated Device Technology, Inc. other brands, product names marks trademarks registered trademarks used identify products services their respective owners. Printed

ICS8OSK270 cost integrated clock synthesizer solution replacing crysta

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