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The ICS181-51 generates a low EMI output clock from a clock or crystal input. The device uses ICS’ 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 ICS181-51 offers center spread selection of +/-0.625% and +/-1.875%. Refer.
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Pin and function compatible to Cypress W181-51 Packaged in 8-pin SOIC Provides a spread spectrum output clock Accepts a clock input and provides same frequency dithered output
• Input frequency of 28 to 75 MHz for Clock input
• 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
FS2:1 SS% PLLClock Synthesis andSpread Spectrum Circuitry
CLK
X1/CLKIN X2
ClockBuffer/ Crystal Oscillator
GND
MDS 181-51 A
1
l
Revision 110.
| No. | Partie # | Fabricant | Description | Fiche Technique |
|---|---|---|---|---|
| 1 | ICS181-52 |
Integrated Circuit Systems |
Low EMI Clock Generator |
|
| 2 | ICS181-52 |
Renesas |
LOW EMI CLOCK GENERATOR |
|
| 3 | ICS181-52 |
IDT |
LOW EMI CLOCK GENERATOR |
|
| 4 | ICS181-53 |
Integrated Circuit Systems |
Low EMI Clock Generator |
|
| 5 | ICS181-01 |
Renesas |
LOW EMI CLOCK GENERATOR |
|
| 6 | ICS181-03 |
Integrated Circuit Systems |
Low EMI Clock Generator |
|
| 7 | ICS180-01 |
Integrated Circuit Systems |
Low EMI Clock Generator |
|
| 8 | ICS180-01 |
IDT |
LOW EMI CLOCK GENERATOR |
|
| 9 | ICS180-01 |
Renesas |
LOW EMI CLOCK GENERATOR |
|
| 10 | ICS180-02 |
Integrated Circuit Systems |
Low EMI Clock Generator |
|
| 11 | ICS180-51 |
IDT |
LOW EMI CLOCK GENERATOR |
|
| 12 | ICS180-51 |
Renesas |
LOW EMI CLOCK GENERATOR |
|