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Cypress Semiconductor Electronic Components Datasheet



W180

Peak Reducing EMI Solution



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W180 pdf
W180
Features
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
• Available in 8-pin SOIC (Small Outline Integrated
Circuit)
Key Specifications
Supply Voltages: ........................................... VDD = 3.3V±5%
or VDD = 5V±10%
Frequency Range: .............................. 8 MHz Fin 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
XTAL
Input
X1
X2
W180
Spread Spectrum
Output
(EMI suppressed)
3.3V or 5.0V
Peak Reducing EMI Solution
Table 1. Modulation Width Selection
SS%
0
1
W180-01, 02, 03
Output
Fin Fout Fin
1.25%
Fin Fout Fin
3.75%
W180-51, 52, 53
Output
Fin + 0.625% Fin
0.625%
Fin + 1.875% Fin
–1.875%
Table 2. Frequency Range Selection
W180 Option#
FS2 FS1
-01, 51
(MHz)
-02, 52
(MHz)
-03, 53
(MHz)
0 0 8 FIN 10 8 FIN 10
N/A
0 1 10 FIN 15 10 FIN 15
N/A
1 0 15 FIN 18 N/A 15 FIN 18
1 1 18 FIN 28 N/A 18 FIN 28
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
Oscillator or
Reference Input
W180
Spread Spectrum
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



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W180 pdf
W180
Pin Definitions
Pin Name
CLKOUT
CLKIN or X1
Pin No.
5
1
NC or X2
SSON#
FS1:2
SS%
2
8 (-02, -03
52, 53)
7, 8 (-01, 51)
4
VDD
GND
6
3
Pin
Type
O
I
I
I
I
I
P
G
Pin Description
Output Modulated Frequency: Frequency modulated copy of the unmodu-
lated input clock (SSON# asserted).
Crystal Connection or External Reference Frequency Input: This pin has
dual functions. It may either be connected to an external crystal, or to an
external reference clock.
Crystal Connection: Input connection for an external crystal. If using an ex-
ternal reference, this pin must be left unconnected.
Spread Spectrum Control (Active LOW): Asserting this signal (active LOW)
turns the internal modulation waveform on. This pin has an internal pull-down
resistor.
Frequency Selection Bit(s) 1 and 2: These pins select the frequency range
of operation. Refer to Table 2. These pins have internal pull-up resistors.
Modulation Width Selection: When Spread Spectrum feature is turned on,
this pin is used to select the amount of variation and peak EMI reduction that
is desired on the output signal. Internal pull-up resistor.
Power Connection: Connected to 3.3V or 5V power supply.
Ground Connection: This should be connected to the common ground plane.
2



Part Number W180
Description Peak Reducing EMI Solution
Maker Cypress Semiconductor - Cypress Semiconductor
Total Page 8 Pages
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