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Integrated Device Technology Electronic Components Datasheet

ICS180-53 Datasheet

LOW EMI CLOCK GENERATOR

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DATASHEET
LOW EMI CLOCK GENERATOR
ICS180-53
Description
The ICS180-53 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 ICS180-53 offers center spread selection of
+/-0.625% and +/-1.875%. 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.
Features
Pin and function compatible to Cypress W180-53
Packaged in 8-pin SOIC
Provides a spread spectrum output clock
Accepts a clock input and provides same frequency
dithered output
Input frequency of 15 to 28 MHz
Peak reduction by 7dB - 14dB typical on 3rd - 19th
odd harmonics
Spread percentage selection for +/-0.625% and
+/-1.875%
Operating voltage of 3.3 V and 5 V
Advanced, low-power CMOS process
Block Diagram
VDD
FS1
SSON#
SS%
X1/CLKIN
X2
Clock Buffer/
Crystal
Oscillator
PLL Clock
Synthesis
and Spread
Spectrum
Circuitry
CLK
GND
IDT™ / ICS™ LOW EMI CLOCK GENERATOR
1
ICS180-53
REV C 051310


Integrated Device Technology Electronic Components Datasheet

ICS180-53 Datasheet

LOW EMI CLOCK GENERATOR

No Preview Available !

ICS180-53
LOW EMI CLOCK GENERATOR
SSCG
Pin Assignment
Spread Spectrum Select Table
X1/CLKIN
X2
GND
SS%
1
2
3
4
8 SSON#
7 FS1
6 VDD
5 CLKOUT
8-pin (150 mil) SOIC
SS%
(Pin 4)
0
1
Spread
Direction
Center
Center
Spread
Percentage (%)
+/-0.625%
+/1.875%
0 = connect to GND
1 = connect directly to VDD
Note: SS% pin has an internal pull-up resistor
Frequency Range Selection Table
FS1 Frequency
(Pin 7) Range Selection
MHz
0 15-18
1 18-28
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
Pin
Name
X1/CLKIN
X2
GND
SS%
CLKOUT
VDD
FS1
SSON#
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.
Spread Spectrum Control. This pin enables spread spectrum when low.
Internal pull-down resistor.
IDT™ / ICS™ LOW EMI CLOCK GENERATOR
2
ICS180-53
REV C 051310


Part Number ICS180-53
Description LOW EMI CLOCK GENERATOR
Maker IDT
Total Page 7 Pages
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