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W180 Datasheet

  • W180

  • Peak Reducing EMI Solution

  • 8頁(yè)

  • CYPRESS

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W180
Peak Reducing EMI Solution
Features
鈥?/div>
Cypress PREMIS鈩?family offering
鈥?Generates an EMI optimized clocking signal at the
output
鈥?Selectable output frequency range
鈥?Single 1.25% or 3.75% down or center spread output
鈥?Integrated loop filter components
鈥?Operates with a 3.3V or 5V supply
鈥?Low power CMOS design
鈥?Available in 8-pin SOIC (Small Outline Integrated
Circuit)
Table 1. Modulation Width Selection
SS%
0
1
W180-01, 02, 03
Output
F
in
鈮?/div>
F
out
鈮?/div>
F
in
鈥?/div>
1.25%
F
in
鈮?/div>
F
out
鈮?/div>
F
in
鈥?/div>
3.75%
W180-51, 52, 53
Output
F
in
+ 0.625%
鈮?/div>
F
in
鈮?/div>
鈥?/div>
0.625%
F
in
+ 1.875%
鈮?/div>
F
in
鈮?/div>
鈥?.875%
Table 2. Frequency Range Selection
W180 Option#
FS2
0
0
1
1
FS1
0
1
0
1
-01, 51
(MHz)
8
鈮?/div>
F
IN
鈮?/div>
10
10
鈮?/div>
F
IN
鈮?/div>
15
15
鈮?/div>
F
IN
鈮?/div>
18
18
鈮?/div>
F
IN
鈮?/div>
28
-02, 52
(MHz)
8
鈮?/div>
F
IN
鈮?/div>
10
10
鈮?/div>
F
IN
鈮?/div>
15
N/A
N/A
-03, 53
(MHz)
N/A
N/A
15
鈮?/div>
F
IN
鈮?/div>
18
18
鈮?/div>
F
IN
鈮?/div>
28
Key Specifications
Supply Voltages: ........................................... V
DD
= 3.3V鹵5%
or V
DD
= 5V鹵10%
Frequency Range: .............................. 8 MHz
鈮?/div>
F
in
鈮?/div>
28 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
3.3V or 5.0V
Pin Configurations
SOIC
W180-01/51
CLKIN or X1
NC or X2
GND
SS%
1
2
3
4
8
7
6
5
FS2
FS1
VDD
CLKOUT
X1
XTAL
Input
X2
W180
Spread Spectrum
Output
(EMI suppressed)
W180-02/03
W180-52/53
CLKIN or X1
NC or X2
GND
SS%
1
2
3
4
8
7
6
5
SSON#
FS1
VDD
CLKOUT
3.3V or 5.0V
Oscillator or
Reference Input
W180
Spread Spectrum
Output
(EMI suppressed)
PREMIS is a trademark of Cypress Semiconductor Corporation.
Cypress Semiconductor Corporation
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134
鈥?/div>
408-943-2600
July 21, 2000, rev. *A

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