W185 查看數據表（PDF） - Cypress Semiconductor
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W185 Datasheet PDF : 8 Pages
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W185
Six Output 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
• Six 1.25%, 3.75%, or 0% down or center spread outputs
• One non-Spread output of Reference input
• Integrated loop filter components
• Operates with a 3.3V or 5V supply
• Low power CMOS design
• Available in 24-pin SSOP (Shrink Small Outline
Package)
• Outputs may be selectively disabled
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.)
SS%
0
1
W185
Output
Fin ≥ Fout ≥ Fin – 1.25%
Fin ≥ Fout ≥ Fin – 3.75%
W185-5
Output
Fin + 0.625% ≥ Fin≥
– 0.625%
Fin + 1.875% ≥ Fin≥
–1.875%
Table 2. Frequency Range Selection
FS2
FS1
0
0
0
1
1
0
1
1
Table 3. Output Enable
Frequency Range
28 MHz ≤ FIN ≤ 38 MHz
38 MHz ≤ FIN ≤ 48 MHz
46 MHz ≤ FIN ≤ 60 MHz
58 MHz ≤ FIN ≤ 75 MHz
EN1 EN2
CLK0:4
0
0 Low
0
1 Low
1
0 Active
CLK5
Low
Active
Low
1
1 Active
Active
Simplified Block Diagram
Pin Configuration
3.3V or 5.0V
XTAL
Input
40MHz
max.
X1
X2
W185
Spread Spectrum
Output
(EMI suppressed)
3.3V or 5.0V
Oscillator or
Reference Input
W185
Spread Spectrum
Output
(EMI suppressed)
SSOP
REFOUT 1
FS2 2
X1 3
X2 4
GND 5
SS% 6
EN2 7
GND 8
CLK0 9
VDD 10
CLK1 11
CLK2 12
24 SSON#
23 RESET
22 FS1
21 VDD
20 VDD
19 NC
18 EN1
17 CLK5
16 VDD
15 CLK4
14 GND
13 CLK3
PREMIS is a trademark of Cypress Semiconductor Corporation.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
July 25, 2000, rev. *A
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