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Cypress Semiconductor - Peak Reducing EMI Solution

Numéro de référence W181
Description Peak Reducing EMI Solution
Fabricant Cypress Semiconductor 
Logo Cypress Semiconductor 





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W181 fiche technique
W181
Features
Cypress PREMIS™ family offering
• Generates an EMI optimized clocking signal at the out-
put
• Selectable input to output frequency
• Single 1.25% or 3.75% down or center spread output
• Integrated loop filter components
• Operates with a 3.3V or 5V supply
• Low power CMOS design
• Available in 8-pin SOIC (Small Outline Integrated Cir-
cuit) or 14-pin TSSOP (Thin Shrink Small Outline Pack-
age select options only)
Key Specifications
Supply Voltages: ........................................... VDD = 3.3V±5%
or VDD = 5V±10%
Frequency Range: ............................ 28 MHz Fin 75 MHz
Crystal Reference Range.................. 28 MHz Fin 40 MHz
Cycle to Cycle Jitter: ....................................... 300 ps (max.)
Selectable Spread Percentage: ....................1.25% or 3.75%
Output Duty Cycle: ............................... 40/60% (worst case)
Output Rise and Fall Time: .................................. 5 ns (max.)
Simplified Block Diagram
3.3 or 5.0V
XTAL
Input
40 MHz
Max.
X1
X2
W181
Spread Spectrum
Output
(EMI suppressed)
3.3 or 5.0V
Oscillator or
Reference Input
W181
Spread Spectrum
Output
(EMI suppressed)
Peak Reducing EMI Solution
Table 1. Modulation Width Selection
SS%
0
1
W181-01, 02, 03
Output
Fin Fout Fin
1.25%
Fin Fout Fin
3.75%
W181-51, 52, 53
Output
Fin + 0.625% Fin
– 0.625%
Fin + 1.875% Fin
–1.875%
Table 2. Frequency Range Selection
W181 Option#
FS2 FS1
-01, 51
(MHz)
-02, 52
(MHz)
-03, 53
(MHz)
0 0 28 FIN 38 28 FIN 38
N/A
0 1 38 FIN 48 38 FIN 48
N/A
1 0 46 FIN 60 N/A 46 FIN 60
1 1 58 FIN 75 N/A 58 FIN 75
Pin Configurations
SOIC
CLKIN or X1
NC or X2
GND
SS%
1
2
3
4
8 FS2
7 FS1
6 VDD
5 CLKOUT
CLKIN or X1
NC or X2
GND
SS%
1
2
3
4
8 SSON#
7 FS1
6 VDD
5 CLKOUT
TSSOP
FS2
CLKIN or X1
NC or X2
GND
NC
SS%
NC
1
2
3
4
5
6
7
14 NC
13 NC
12 FS1
11 NC
10 VDD
9 NC
8 CLKOUT
PREMIS is a trademark of Cypress Semiconductor Corporation.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
July 21, 2000, rev. *B

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