W180
Peak Reducing EMI Solution
Features
Table 1. Modulation Width Selection
Cypress PREMIS™ family offering
• Generates an EMI optimized clocking signal at the
output
• Selectable output frequency range
• 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
•
W180-01, 02, 03
Output
W180-51, 52, 53
Output
SS%
0
F
≥ F ≥ F
–
F + 0.625% ≥ F ≥ –
in
out
in
in
in
1.25%
0.625%
1
F
≥ F ≥ F
–
F + 1.875% ≥ F ≥
in
out
in
in
in
3.75%
–1.875%
Table 2. Frequency Range Selection
• Available in 8-pin SOIC (Small Outline Integrated
Circuit)
W180 Option#
-02, 52
Key Specifications
-01, 51
(MHz)
-03, 53
(MHz)
FS2 FS1
(MHz)
Supply Voltages: ...........................................V = 3.3V±5%
DD
0
0
1
1
0
1
0
1
8 ≤ F ≤ 10
IN
8 ≤ F ≤ 10
N/A
IN
or V = 5V±10%
DD
10 ≤ F ≤ 15 10 ≤ F ≤ 15
N/A
Frequency Range: .............................. 8 MHz ≤ F ≤ 28 MHz
IN
IN
in
15 ≤ F ≤ 18
N/A
15 ≤ F ≤ 18
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.)
IN
IN
18 ≤ F ≤ 28
N/A
18 ≤ F ≤ 28
IN
IN
Simplified Block Diagram
Pin Configurations
3.3V or 5.0V
SOIC
CLKIN or X1
NC or X2
GND
FS2
1
2
3
4
8
7
6
5
FS1
X1
VDD
XTAL
SS%
CLKOUT
Input
X2
Spread Spectrum
Output
W180
(EMI suppressed)
CLKIN or X1
NC or X2
GND
SSON#
FS1
1
2
3
4
8
7
6
5
VDD
SS%
CLKOUT
3.3V or 5.0V
Oscillator or
Reference Input
Spread Spectrum
W180
Output
(EMI suppressed)
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. *A