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Integrated Device Technology Electronic Components Datasheet



ICS290

Triple PLL Field Prog. Spread Spectrum Clock Synthesizer



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ICS290 pdf
PRELIMINARY INFORMATION
ICS290www.DataSheet4U.com
Triple PLL Field Prog. Spread Spectrum Clock Synthesizer
Description
The ICS290 field programmable spread spectrum
clock synthesizer generates up to eight 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.
Using ICS’ VersaClockTM software to configure PLLs
and outputs, the ICS290 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 four
low-skew outputs.
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 ICS290 is also available in factory programmed
custom versions for high-volume applications.
Features
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 eight reference outputs
Up to two sets of four low-skew outputs
Operating voltages of 3.3 V
Controllable output drive levels
Advanced, low-power CMOS process
Available in Pb (lead) free packaging
Block Diagram
S2:S0 3
OTP
ROM
with PLL
Values
X1/ICLK
Crystal or
Clock Input
X2
Crystal
Oscillator
External capacitors
are required with a crystal input.
VDD 3
PLL1 with
Spread
Spectrum
PLL2
PLL3
Divide
Logic
and
Output
Enable
Control
GND 3
PDTS
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
MDS 290 C
1
Revision 062305
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com



No Preview Available !

ICS290 pdf
PRELIMINARY INFORMATION
ICS290
Triple PLL Field Prog. Spread Spectrum Cwlwowck.DaStaySnhethete4Us.iczoemr
Pin Assignment
GND
S0
S1
VDD
CLK1
CLK2
CLK3
CLK4
GND
X1/ICLK
1
2
3
4
5
6
7
8
9
10
20 S2
19 VDD
18 PDTS
17 GND
16 CLK8
15 CLK7
14 CLK6
13 CLK5
12 VDD
11 X2
20 pin (173 mil) TSSOP
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin
Name
GND
S0
S1
VDD
CLK1
CLK2
CLK3
CLK4
GND
X1/ICLK
X2
VDD
CLK5
CLK6
CLK7
CLK8
GND
PDTS
VDD
S2
Pin
Type
Power
Input
Input
Power
Output
Output
Output
Output
Power
XI
XO
Power
Output
Output
Output
Output
Power
Input
Power
Input
Pin Description
Connect to ground.
Select pin 0. Internal pull-up resistor.
Select pin 1. Internal pull-up resistor.
Connect to +3.3 V.
Output clock 1. Weak internal pull-down when tri-state.
Output clock 2. Weak internal pull-down when tri-state.
Output clock 3. Weak internal pull-down when tri-state.
Output clock 4. Weak internal pull-down when tri-state.
Connect to ground.
Crystal input. Connect this pin to a crystal or external input clock.
Crystal Output. Connect this pin to a crystal. Float for clock input.
Connect to +3.3 V.
Output clock 5. Weak internal pull-down when tri-state.
Output clock 6. Weak internal pull-down when tri-state.
Output clock 7. Weak internal pull-down when tri-state.
Output clock 8. Weak internal pull-down when tri-state.
Connect to ground.
Power-down tri-state. Powers down entire chip and tri-states clock outputs
when low. Internal pull-up resistor.
Connect to +3.3 V.
Select pin 2. Internal pull-up resistor.
MDS 290 C
2
Revision 062305
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com



Part Number ICS290
Description Triple PLL Field Prog. Spread Spectrum Clock Synthesizer
Maker Integrated Device Technology - Integrated Device Technology
Total Page 8 Pages
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