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Integrated Device Technology Electronic Components Datasheet

ICS180-01 Datasheet

LOW EMI CLOCK GENERATOR

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DATASHEET
LOW EMI CLOCK GENERATOR
ICS180-01
Description
The ICS180-01 generates a low EMI output clock from
a clock or crystal input. The device uses IDT’s
proprietary mix of analog and digital Phase Locked
Loop (PLL) technology to spread the frequency
spectrum of the output, thereby reducing the frequency
amplitude peaks by several dB.
The ICS180-01 offers down spread selection of -1.25%
and -3.75%. Refer to the MK1714-01/02 for the widest
selection of input frequencies and multipliers.
IDT offers a complete line of EMI reducing clock
generators. Consult us when you need to remove
crystals and oscillators from your board.
Block Diagram
Features
Pin and function compatible to Cypress W180-01
Packaged in 8-pin SOIC
Provides a spread spectrum output clock
Accepts a clock input and provides same frequency
dithered output
Input frequency of 8 to 28 MHz
Peak reduction by 7dB - 14dB typical on 3rd - 19th
odd harmonics
Spread percentage selection for -1.25% and -3.75%
Operating voltage of 3.3 V and 5 V
Advanced, low-power CMOS process
Industrial temperature range available
VDD
FS2:1
SS%
X1/CLKIN
X2
Clock Buffer/
Crystal
Oscillator
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
CLK
GND
IDT™ / ICS™ LOW EMI CLOCK GENERATOR
1
ICS180-01 REV D 051310


Integrated Device Technology Electronic Components Datasheet

ICS180-01 Datasheet

LOW EMI CLOCK GENERATOR

No Preview Available !

ICS180-01
LOW EMI CLOCK GENERATOR
SSCG
Pin Assignment
X1/CLKIN
X2
GND
SS%
1
2
3
4
8 FS2
7 FS1
6 VDD
5 CLKOUT
8-pin (150 mil) SOIC
Spread Spectrum Select Table
SS%
(Pin 4)
0
1
Spread
Direction
Down
Down
Spread
Percentage (%)
-1.25%
-3.75%
0 = connect to GND
1 = connect directly to VDD
Note: SS% pin has an internal pull-up resistor
Frequency Range Selection Table
FS2
(Pin 8)
0
0
1
1
FS1
(Pin 7)
0
1
0
1
Frequency Range Selection
(MHz)
8-10
10-15
15-18
18-28
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
Pin
Name
X1/CLKIN
X2
GND
SS%
CLKOUT
VDD
FS1
FS2
Pin Type
Pin Description
Input
Output
Power
Input
Output
Power
Input
Input
Crystal or Clock Input.
Crystal output. Float for a clock input.
Connect to ground.
Select pin for spread amount. See table above. Internal pull-up resistor.
Spread spectrum clock output per table above.
Connect to 3.3 V or 5 V.
Select pin for input frequency. See table above. Internal pull-up resistor.
Select pin for input frequency. See table above. Internal pull-up resistor.
IDT™ / ICS™ LOW EMI CLOCK GENERATOR
2
ICS180-01 REV D 051310


Part Number ICS180-01
Description LOW EMI CLOCK GENERATOR
Maker IDT
Total Page 9 Pages
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