844256BGLFT

844256BGLFT Datasheet

ICS844256

Part	Datasheet
844256BGLFT	844256BGLFT (pdf)

Related Parts	Information
844256BGLF	844256BGLF

PDF Datasheet Preview
FEMTOCLOCKS CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER ICS844256 The ICS844256 is a Cr ystal-to-LVDS Clock Synthesizer/Fanout Buffer designed for SONET HiPerClockS a n d G i g a b i t E t h e r n e t a p l i c a t i o n s a n d i s a member of the HiperClock S family of High Perfor mance Clock Solutions from IDT. The output frequency can be set using the frequency select pins and a 25MHz crystal for Ethernet frequencies, or a 19.44MHz crystal for SONET. The low phase noise character- istics of the ICS844256 make it an ideal clock for these demanding applications. • Six LVDS outputs • Crystal oscillator interface • Output frequency range 62.5MHz to 622.08MHz • Crystal input frequency range 15.625MHz to 25.5MHz • RMS phase jitter at 125MHz, using a 25MHz crystal 1.875MHz to 20MHz 0.48ps typical • Full 3.3V or 3.3V core, 2.5V output supply mode • 0°C to 70°C ambient operating temperature SELECT FUNCTION TABLE Inputs Function • Available in both standard RoHS 5 and lead-free RoHS 6 packages FB_SEL N_SEL1 N_SEL0 M Divide N Divide M/N BLOCK DIAGRAM PLL_BYPASS Pullup XTAL_IN XTAL_OUT FB_SEL Pulldown N_SEL1 Pullup Pullup N_SEL0 1 Output Divider Feedback Divider PIN ASSIGNMENT VDDO 1 24 Q3 VDDO 2 nQ2 3 23 nQ3 22 Q4 21 nQ4 nQ1 5 20 Q5 19 nQ5 nQ0 7 18 N_SEL1 17 GND PLL_BYPASS 9 16 GND TABLE ORDERING INFORMATION Part/Order Number Marking Package Shipping Packaging Temperature 844256BG ICS844256BG 24 Lead TSSOP, E-Pad tube 0°C to 70°C 844256BGT ICS844256BG 24 Lead TSSOP, E-Pad 2500 tape & reel 0°C to 70°C 844256BGLF ICS844256BGLF 24 Lead "Lead-Free" TSSOP, E-Pad tube 0°C to 70°C 844256BGLFT ICS844256BGLF 24 Lead "Lead-Free" TSSOP, E-Pad 2500 tape & reel 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, Incorporated IDT assumes no responsibility for either its use or for 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. IDT / ICS LVDS FREQUENCY SYNTHESIZER W/FANOUT BUFFER 16 ICS844256 FEMTOCLOCKS CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER Innovate with IDT and accelerate your future networks. Contact: For Sales 800-345-7015 inside USA +408-284-8200 outside USA Fax 408-284-2775 For Tech Support +480-763-2056 Corporate Headquarters Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 United States 800-345-7015 inside USA +408-284-8200 outside USA 2008 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT, the IDT logo, ICS and HiPerClockS are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. Printed in USA

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FEMTOCLOCKS CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

ICS844256

The ICS844256 is a Cr ystal-to-LVDS Clock

Synthesizer/Fanout Buffer designed for SONET

HiPerClockS a n d G i g a b i t E t h e r n e t a p l i c a t i o n s a n d i s a
member of the HiperClock S family of High

Perfor mance Clock Solutions from IDT. The
output frequency can be set using the frequency select
pins and a 25MHz crystal for Ethernet frequencies, or a
19.44MHz crystal for SONET. The low phase noise character-
istics of the ICS844256 make it an ideal clock for these
demanding applications.
• Six LVDS outputs
• Crystal oscillator interface
• Output frequency range 62.5MHz to 622.08MHz
• Crystal input frequency range 15.625MHz to 25.5MHz
• RMS phase jitter at 125MHz, using a 25MHz crystal
1.875MHz to 20MHz 0.48ps typical
• Full 3.3V or 3.3V core, 2.5V output supply mode
• 0°C to 70°C ambient operating temperature

SELECT FUNCTION TABLE

Inputs

Function
• Available in both standard RoHS 5 and lead-free RoHS 6 packages

FB_SEL N_SEL1 N_SEL0 M Divide N Divide M/N

BLOCK DIAGRAM

PLL_BYPASS Pullup

XTAL_IN XTAL_OUT

FB_SEL Pulldown N_SEL1 Pullup

Pullup N_SEL0
1 Output

Divider

Feedback Divider

PIN ASSIGNMENT

VDDO 1
24 Q3

VDDO 2 nQ2 3
23 nQ3 22 Q4
21 nQ4
nQ1 5
20 Q5
19 nQ5
nQ0 7
18 N_SEL1
17 GND

PLL_BYPASS 9
16 GND
TABLE ORDERING INFORMATION

Part/Order Number

Marking

Package

Shipping Packaging Temperature
844256BG

ICS844256BG
24 Lead TSSOP, E-Pad
tube
0°C to 70°C
844256BGT

ICS844256BG
24 Lead TSSOP, E-Pad
2500 tape & reel 0°C to 70°C
844256BGLF

ICS844256BGLF 24 Lead "Lead-Free" TSSOP, E-Pad
tube
0°C to 70°C
844256BGLFT

ICS844256BGLF 24 Lead "Lead-Free" TSSOP, E-Pad 2500 tape & reel 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, Incorporated IDT assumes no responsibility for either its use or for 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.

IDT / ICS LVDS FREQUENCY SYNTHESIZER W/FANOUT BUFFER 16

ICS844256 FEMTOCLOCKS CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

Innovate with IDT and accelerate your future networks. Contact:

For Sales
800-345-7015 inside USA +408-284-8200 outside USA Fax 408-284-2775

For Tech Support
+480-763-2056

Corporate Headquarters

Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 United States 800-345-7015 inside USA +408-284-8200 outside USA
2008 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT, the IDT logo, ICS and HiPerClockS are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. Printed in USA

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived 844256BGLFT Datasheet file may be downloaded here without warranties.

Datasheet ID: 844256BGLFT 637133