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參數資料
| 型號： | W181-02G |
| 英文描述： | MISCELLANEOUS CLOCK GENERATOR|CMOS|SOP|8PIN|PLASTIC |
| 中文描述： | 雜項時鐘發生器|的CMOS |專科| 8引腳|塑料 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 160K |
| 代理商： | W181-02G |
Peak Reducing EMI Solution
W181
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
January 5, 2000, rev. *A
Features
Cypress PREMIS
family offering
Generates an EMI optimized clocking signal at the
output
Selectable input to output frequency
Single –1.25% or –3.75% down 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) or 14-pin TSSOP (Thin Shrink Small Outline
Package)
Key Specifications
Supply Voltages: ...........................................V
DD
= 3.3V±5%
or V
DD
= 5V±10%
Frequency Range: ............................ 28 MHz
≤
F
in
≤
75 MHz
Crystal Reference Range.................. 28 MHz
≤
F
in
≤
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)
Table 1. Modulation Width Selection
SS%
Output
0
F
in
≥
F
out
≥
F
in
– 1.25%
F
in
≥
F
out
≥
F
in
– 3.75%
1
Table 2. Frequency Range Selection
W181 Option#
FS2
FS1
-01
(MHz)
-02
(MHz)
-03
(MHz)
0
0
28
≤
F
IN
≤
38
38
≤
F
IN
≤
48
46
≤
F
IN
≤
60
58
≤
F
IN
≤
75
28
≤
F
IN
≤
38
38
≤
F
IN
≤
48
N/A
N/A
0
1
N/A
1
0
46
≤
F
IN
≤
60
58
≤
F
IN
≤
75
1
1
N/A
PREMIS is a trademark of Cypress Semiconductor Corporation.
Simplified Block Diagram
Pin Configurations
W
8
7
6
5
1
2
3
4
CLKIN or X1
NC or X2
GND
SS%
SSON#
FS1
VDD
CLKOUT
W
8
7
6
5
1
2
3
4
CLKIN or X1
NC or X2
GND
SS%
FS2
FS1
VDD
CLKOUT
SOIC
Spread Spectrum
Output
W181
(EMI suppressed)
3.3 or 5.0V
Oscillator or
Reference Input
Spread Spectrum
Output
W181
(EMI suppressed)
3.3 or 5.0V
XTAL
Input
X1
X2
40 MHz
Max.
W
8
1
2
3
4
5
6
7
CLKIN or X1
NC or X2
GND
NC
SS%
NC
NC
NC
FS1
NC
VDD
NC
CLKOUT
9
10
11
12
13
14
FS2
TSSOP
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