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ICS525RI-08T

Description
lvcmos user configurable clock
File Size109KB,9 Pages
ManufacturerIntegrated Circuit Systems(IDT )
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ICS525RI-08T Overview

lvcmos user configurable clock

PRELIMINARY INFORMATION
ICS525-07/08
LVCMOS User Configurable Clock
Description
The ICS525-07/08 are the most flexible way to
generate a high-quality clock output from an
inexpensive crystal or clock input at low supply
voltages. The user can configure the device to produce
nearly any output frequency from any input frequency
by grounding or floating the select pins or by driving or
hard wiring the select pins high or low. Neither
microcontroller, software, nor device programmer are
needed to set the frequency. Using Phase-Locked
Loop (PLL) techniques, the device accepts a standard
fundamental mode, inexpensive crystal to produce
output clocks up to 250 MHz. It can also produce a
highly accurate output clock from a given input clock,
keeping them frequency locked.
For similar capability with a serial interface, use the
ICS307.
This product is intended for clock generation. It has low
output jitter (variation in the output period), but input to
output skew is not defined nor guaranteed.
Features
Packaged as 28-pin SSOP (150 mil body)
Available in Pb (lead) free package
User determines the output frequency by setting all
internal dividers
Eliminates need for custom oscillators
Low voltage operation
Pull-ups on all select inputs
Input crystal frequency of 5 - 27 MHz
Input clock frequency of 2 - 50 MHz
Compensated loop bandwidth
Enhanced low frequency operation (-08 version)
Low jitter
Duty cycle of 45/55 up to 200 MHz
Operating voltage of 1.8 V to 2.5 V
Ideal for oscillator replacement
Available in commercial and industrial temperature
ranges
Block Diagram
2
PD
X1/ICLK
Crystal
or clock
input
Crystal
Oscillator
X2
Reference
Divider
Phase
Comparator,
Charge
Pump,
and
Loop Filter
VCO
VCO
Divider
Divider
VDD
REF
VCO
Output
Divider
CLK
Optional crystal
capacitors
Optional crystal
capacitors
2
2
R
Configuration Pins
R
Configuration Pins
V Configuration Pins
V Configuration Pins
GND
GND
S Configuration Pins
S Configuration Pins
MDS 525-07/08 A
Integrated Circuit Systems, Inc.
1
525 Race Street, San Jose, CA 95126
Revision 101105
tel (408) 297-1201
www.icst.com

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