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W181-01X Datasheet

  • W181-01X

  • MISCELLANEOUS CLOCK GENERATOR|CMOS|TSSOP|14PIN|PLASTIC

  • 10頁

  • ETC

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W181
Peak Reducing EMI Solution
Features
鈥?/div>
Cypress PREMIS鈩?family offering
鈥?Generates an EMI optimized clocking signal at the out-
put
鈥?Selectable input to output frequency
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 Cir-
cuit) or 14-pin TSSOP (Thin Shrink Small Outline Pack-
age select options only)
Table 1. Modulation Width Selection
SS%
0
1
W181-01, 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%
W181-51, 52, 53
Output
F
in
+ 0.625%
鈮?/div>
F
in
鈮?/div>
鈥?0.625%
F
in
+ 1.875%
鈮?/div>
F
in
鈮?/div>
鈥?.875%
Table 2. Frequency Range Selection
W181 Option#
FS2
0
0
1
1
FS1
0
1
0
1
-01, 51
(MHz)
28
鈮?/div>
F
IN
鈮?/div>
38
38
鈮?/div>
F
IN
鈮?/div>
48
46
鈮?/div>
F
IN
鈮?/div>
60
58
鈮?/div>
F
IN
鈮?/div>
75
-02, 52
(MHz)
28
鈮?/div>
F
IN
鈮?/div>
38
38
鈮?/div>
F
IN
鈮?/div>
48
N/A
N/A
-03, 53
(MHz)
N/A
N/A
46
鈮?/div>
F
IN
鈮?/div>
60
58
鈮?/div>
F
IN
鈮?/div>
75
Key Specifications
Supply Voltages: ...........................................V
DD
= 3.3V鹵5%
or V
DD
= 5V鹵10%
Frequency Range: ............................ 28 MHz
鈮?/div>
F
in
鈮?/div>
75 MHz
Crystal Reference Range.................. 28 MHz
鈮?/div>
F
in
鈮?/div>
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
3.3 or 5.0V
Pin Configurations
SOIC
W181-01/51
X1
XTAL
Input
CLKIN or X1
NC or X2
GND
SS%
X2
1
2
3
4
8
7
6
5
FS2
FS1
VDD
CLKOUT
40 MHz
Max.
W181
Spread Spectrum
Output
(EMI suppressed)
CLKIN or X1
NC or X2
GND
SS%
1
2
3
4
8
7
6
5
SSON#
FS1
VDD
CLKOUT
W181-02/03
W181-52/53
3.3 or 5.0V
TSSOP
FS2
CLKIN or X1
Oscillator or
Reference Input
NC or X2
GND
NC
SS%
NC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
NC
NC
FS1
NC
VDD
NC
CLKOUT
W181-01
W181
Spread Spectrum
Output
(EMI suppressed)
PREMIS is a trademark of Cypress Semiconductor Corporation.
Cypress Semiconductor Corporation
Document #: 38-07152 Rev. **
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?408-943-2600
Revised September 25, 2001

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