872S480BKLFT
872S480BKLFT Datasheet
ICS872S480
| Part | Datasheet |
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872S480BKLFT |
872S480BKLFT (pdf) |
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872S480BKLF |
872S480BKLF |
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| Differential-to-HSTL Zero Delay Clock Generator ICS872S480 DATA SHEET The ICS872S480 is a Zero Delay Clock Generator with hitless input clock switching capability. The ICS872S480 is ideal for use in redundant, fault tolerant clock trees where low jitter frequency synthesis are critical. The device receives two differential clock signals from which it generates two outputs with “zero” delay. The output and feedback dividers are configured to allow for a 1:1 frequency generation ratio. The ICS872S480 Dynamic Clock Switch DCS circuit continuously monitors both input clock signals. Upon detection of an invalid clock input stuck LOW or HIGH for at least one complete clock period of the VCO feedback frequency , the loss of reference monitor will be set HIGH. If that clock is the primary clock, the DCS will switch to the good secondary clock and phase/frequency alignment will occur with minimal output phase disturbance. Once the primary clock is restored to a good state, the DCS will automatically switch back to the primary clock input. The low jitter characteristics with input clock monitoring and DCS capability make the ICS872S480 an ideal choice for DDR3 applications requiring fault tolerant reference clocks. • Three differential HSTL output pairs • Selectable differential CLKx, nCLKx input pairs • CLKx, nCLKx pairs can accept the following differential input levels LVPECL, LVDS, HSTL, HCSL • Output frequency range 350MHz to 950MHz • Input frequency range 350MHz to 950MHz • VCO range 970MHz to 2250MHz • External feedback for “zero delay” clock regeneration with configurable frequencies • Static phase offset ±100ps maximum • Cycle-to-cycle jitter 25ps maximum • Output skew 20ps maximum • 3.3V operating voltage supply • Selectable DDR3 or DDR3 low voltage output • 0°C to 70°C ambient operating temperature • Available in lead-free RoHS 6 package Function Table Input FREQ_SEL Output Divider 1 default Input & Output Frequency MHz Minimum Maximum Output Voltage Table Input VOUT_SEL HSTL Output Style 0 default 1.5V 1.35V Pin Assignment VDD REF_SEL AUTO_SEL nc GND nc VOUT_SEL VDD CLK0 nCLK0 GND CLK1 nCLK1 PLL_BYPASS FB_IN nFB_IN 32 31 30 29 28 27 26 25 24 VDD 23 LOR0 22 LOR1 21 CLK_IND 20 GND 19 FREQ_SEL 18 OE 17 VDDA 9 10 11 12 13 14 15 16 nQFB QFB VDD nQ1 Q1 nQ0 Q0 VDD ICS872S480 Ordering Information Table Ordering Information Part/Order Number 872S480BKLF 872S480BKLFT Marking ICS72S480BL Package “Lead-Free” 32 Lead VFQFN “Lead-Free” 32 Lead VFQFN Shipping Packaging Tray 2500 Tape & Reel Temperature 0°C to 70°C 0°C to 70°C NOTE Parts that are ordered with an "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology IDT assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications, such as those requiring extended temperature ranges, high reliability or other extraordinary environmental requirements are not recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. 2011 Integrated Device Technology, Inc. ICS872S480 Data Sheet DIFFERENTIAL-TO-HSTL ZERO DELAY CLOCK GENERATOR We’ve Got Your Timing Solution 6024 Silver Creek Valley Road San Jose, California 95138 Sales 800-345-7015 inside USA +408-284-8200 outside USA Fax 408-284-2775 Technical Support +480-763-2056 DISCLAIMER Integrated Device Technology, Inc. IDT and its subsidiaries reserve the right to modify the products and/or specifications described herein at any time and at IDT’s sole discretion. All information in this document, including descriptions of product features and performance, is subject to change without notice. Performance specifications and the operating parameters of the described products are determined in the independent state and are not guaranteed to perform the same way when installed in customer products. The information contained herein is provided without representation or warranty of any kind, whether express or implied, including, but not limited to, the suitability of IDT’s products for any particular purpose, an implied warranty of merchantability, or non-infringement of the intellectual property rights of others. This document is presented only as a guide and does not convey any license under intellectual property rights of IDT or any third parties. IDT’s products are not intended for use in life support systems or similar devices where the failure or malfunction of an IDT product can be reasonably expected to significantly affect the health or safety of users. Anyone using an IDT product in such a manner does so at their own risk, absent an express, written agreement by IDT. Integrated Device Technology, IDT and the IDT logo are registered trademarks of IDT. Other trademarks and service marks used herein, including protected names, logos and designs, are the property of IDT or their respective third party owners. Copyright All rights reserved. |
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