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ICS291GI-XX PDF预览

ICS291GI-XX

更新时间: 2024-10-27 13:08:35
品牌 Logo 应用领域
艾迪悌 - IDT 时钟
页数 文件大小 规格书
10页 218K
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ICS291GI-XX 数据手册

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PRELIMINARY DATASHEET  
TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER ICS291  
Description  
Features  
The ICS291 field programmable spread spectrum clock  
synthesizer generates up to six high-quality, high-frequency  
clock outputs including multiple reference clocks from a  
low-frequency crystal input. It is designed to replace  
crystals, crystal oscillators and stand alone spread  
spectrum devices in most electronic systems.  
Packaged as 20-pin TSSOP  
Eight addressable registers  
Replaces multiple crystals and oscillators  
Output frequencies up to 200 MHz at 3.3 V  
Configurable Spread Spectrum Modulation  
Input crystal frequency of 5 to 27 MHz  
Clock input frequency of 3 to 166 MHz  
Up to six reference outputs  
TM  
Using ICS’ VersaClock software to configure PLLs and  
outputs, the ICS291 contains a One-Time Programmable  
(OTP) ROM for field programmability. Programming  
features include input/output frequencies, spread spectrum  
amount, eight selectable configuration registers and up to  
two sets of three low-skew outputs.  
Separate 1.8 to 3.3 V VDDO output level controls for  
each bank of 3 outputs  
Up to two sets of three low-skew outputs  
Operating voltages of 3.3 V  
Controllable output drive levels  
Each of the two output groups are powered by a separate  
VDDO voltage. VDDO may vary from 1.8 V to VDD.  
Advanced, low-power CMOS process  
Available in Pb (lead) free packaging  
Using Phase-Locked Loop (PLL) techniques, the device  
runs from a standard fundamental mode, inexpensive  
crystal, or clock. It can replace multiple crystals and  
oscillators, saving board space and cost.  
The ICS291 is also available in factory programmed custom  
versions for high-volume applications.  
Block Diagram  
VDDO1  
3
VDD  
PLL1 with  
Spread  
Spectrum  
3
S2:S0  
OTP  
CLK1  
CLK2  
CLK3  
ROM  
with PLL  
Values  
Divide  
Logic  
and  
Output  
Enable  
Control  
PLL2  
PLL3  
CLK4  
CLK5  
CLK6  
X1/ICLK  
Crystal  
Oscillator  
Crystal or  
Clock Input  
X2  
3
External capacitors  
are required with a crystal input.  
GND  
VDDO2  
PDTS  
IDT™ / ICS™ TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 1  
ICS291  
REV D 061306  

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