650R-21ILFT IDT, 650R-21ILFT Datasheet

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650R-21ILFT

Manufacturer Part Number
650R-21ILFT
Description
Clock Drivers & Distribution SYSTEM PERIPHERAL CLOCK SOURCE
Manufacturer
IDT
Datasheet

Specifications of 650R-21ILFT

Rohs
yes
Part # Aliases
ICS650R-21ILFT
SYSTEM PERIPHERAL CLOCK SOURCE
Description
The ICS650-21 is a low cost, low-jitter, high-performance
clock synthesizer for system peripheral applications. Using
analog/digital Phase Locked Loop (PLL) techniques, the
device accepts a parallel resonant 25 MHz crystal input to
produce up to eight output clocks. The device provides
clocks for PCI, SCSI, Fast Ethernet, Ethernet, USB, and
AC97. The user can select one of three USB frequencies
and also one of two AC97 audio frequencies. The OE pin
puts all outputs into a high-impedance state for board level
testing. All frequencies are generated with less than one
ppm error, meeting the demands of SCSI and Ethernet
clocking.
Block Diagram
IDT™ / ICS™ SYSTEM PERIPHERAL CLOCK SOURCE
Crystal or Clock
25 MHz
ASEL
USEL
PSEL1:0
X1/ICLK
X2
Optional crystal
capacitors
2
Oscillator
Crystal
GND
VDD
3
2
1
Features
Synthesis
Circuitry
Packaged in 20-pin SSOP (QSOP)
Pb (lead) free package, RoHS compliant
Lower jitter version of ICS650-01
Operating voltage of 3.3 V or 5 V
Zero ppm synthesis error in all clocks
Inexpensive 25 MHz crystal or clock input
Provides Ethernet and Fast Ethernet clocks
Provides SCSI clocks
Provides PCI clocks
Selectable AC97 audio clock
Selectable USB clock
OE pin tri-states the outputs for testing
Selectable frequencies on three clocks
Duty cycle of 45/55 for Processor clock and Audio clock
Advanced, low-power CMOS process
Industrial temperature range available
Clock
OE (all outputs)
3
20 MHz
Processor
Clocks
25 MHz
Audio Clock
USB Clock
ICS650-21
DATASHEET
ICS650-21
REV J 051310

Related parts for 650R-21ILFT

650R-21ILFT Summary of contents

Page 1

... PSEL1:0 ASEL USEL X1/ICLK 25 MHz Crystal or Clock X2 Optional crystal capacitors IDT™ / ICS™ SYSTEM PERIPHERAL CLOCK SOURCE Features • Packaged in 20-pin SSOP (QSOP) • Pb (lead) free package, RoHS compliant • Lower jitter version of ICS650-01 • Operating voltage of 3 • ...

Page 2

... Power 6 GND Power 7 UCLK Output 8 20M Output 9 ACLK Output 10 25M Output 11 OE Input 12 PCLK1 Output IDT™ / ICS™ SYSTEM PERIPHERAL CLOCK SOURCE Processor Clock (MHz) PSEL1 PSEL1 PSEL0 0 PCLK2 0 PCLK3 0 VDD M ASEL M GND OFF/14.318M M PCLK1 Audio Clock (MHz) ...

Page 3

... When the PCB trace between the clock outputs and the loads are over 1 inch, series termination should be used. To series terminate a 50 trace (a commonly used trace IDT™ / ICS™ SYSTEM PERIPHERAL CLOCK SOURCE Pin Description 14.31818 MHz clock output only when ASEL = VDD. ...

Page 4

... Stresses above the ratings listed below can cause permanent damage to the ICS650-21. These ratings, which are standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. ...

Page 5

... Absolute Clock Period Jitter Power-up Time Note 1: Values dependent on programming. Note 2: Measured with 15 pF load. Thermal Characteristics Parameter Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case IDT™ / ICS™ SYSTEM PERIPHERAL CLOCK SOURCE Symbol Conditions All clocks t 0.8 to 2.0 V, Note 2.0 to 0.8 V, Note 2 ...

Page 6

... ICS650R-21L 650R-21ILF 650R-21ILF 650R-21ILFT 650R-21ILF “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 ...

Page 7

... Revision History Rev. Originator Date Description of Change G P. Griffith 02/15/06 Added “Power-up Time” spec in AC chars. H 11/04/09 Added EOL note for non-green parts. J 05/13/10 Removed EOL note and non-green parts. IDT™ / ICS™ SYSTEM PERIPHERAL CLOCK SOURCE 7 CLOCK SYNTHESIZER ICS650-21 REV J 051310 ...

Page 8

... Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo 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 ...

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