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W183 Datasheet, PDF (1/9 Pages) Cypress Semiconductor – Full Feature Peak Reducing EMI Solution | |||
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W183
Full Feature Peak Reducing EMI Solution
Features
⢠Cypress PREMIS⢠family offering
⢠Generates an EMI optimized clocking signal at the out-
put
⢠Selectable output frequency range
⢠Single 1.25%, 3.75% down or center spread output
⢠Integrated loop filter components
⢠Operates with a 3.3 or 5V supply
⢠Low power CMOS design
⢠Available in 14-pin SOIC (Small Outline Integrated
Circuit)
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
3.3V or 5.0V
Table 1. Modulation Width Selection
SS%
0
1
W183
Output
Fin ⥠Fout ⥠Fin â
1.25%
Fin ⥠Fout ⥠Fin â
3.75%
W183-5
Output
Fin + 0.625% ⥠Finâ¥
â 0.625%
Fin + 1.875% ⥠Finâ¥
â1.875%
Table 2. Frequency Range Selection
FS2
FS1
0
0
0
1
1
0
1
1
Frequency Range
28 MHz ⤠FIN ⤠38 MHz
38 MHz ⤠FIN ⤠48 MHz
46 MHz ⤠FIN ⤠60 MHz
58 MHz ⤠FIN ⤠75 MHz
Pin Configuration
SOIC
XTAL
Input
40 MHz
Max
X1
X2
W183
Spread Spectrum
Output
(EMI suppressed)
FS2 1
CLKIN or X1 2
NC or X2 3
GND 4
GND 5
SS% 6
FS1 7
14 REFOUT
13 OE#
12 SSON#
11 Reset
10 VDD
9 VDD
8 CLKOUT
3.3V or 5.0V
Oscillator or
Reference Input
W183
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
Document #: 38-07158 Rev. *A
Revised September 25, 2001
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