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參數(shù)資料
| 型號： | W166 |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | 時鐘及定時 |
| 英文描述： | Spread Spectrum Frequency Timing Generator(寬頻譜頻率定時發(fā)生器) |
| 中文描述： | PLL BASED CLOCK DRIVER, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 114K |
| 代理商： | W166 |
Spread Spectrum Frequency Timing Generator
W166
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
December 20, 1999, rev. **
408-943-2600
Features
Maximized EMI suppression using Cypress’s Spread
Spectrum technology
Generates a spread spectrum copy of the provided
input
Selectable spreading characteristics
Integrated loop filter components
Operates with a 3.3V or 5V supply
SSON# pin enables frequency spreading
Low power CMOS design
Available in 8-pin SOIC (Small Outline Integrated
Circuit)
Overview
The W166 incorporates the latest advances in PLL spread
spectrum frequency synthesizer techniques. By frequency
modulating the output with a low-frequency carrier, peak EMI
is greatly reduced. Use of this technology allows systems to
pass increasingly difficult EMI testing without resorting to cost-
ly shielding or redesign.
In a system, not only is EMI reduced in the various clock lines,
but also in all signals which are synchronized to the clock.
Therefore, the benefits of using this technology increase with
the number of address and data lines in the system. The Sim-
plified Block Diagram shows a simple implementation.
Table 1. Frequency Spread Selection
W166
Input
Frequency
(MHz)
Output
Frequency (MHz)
FS1
FS0
0
0
50 to 65
f
IN
±0.625%
f
IN
±1.25%
f
IN
±2.5%
f
IN
–3.75%
0
1
50 to 65
1
0
50 to 65
1
1
50 to 65
Simplified Block Diagram
Pin Configuration
Oscillator or Reference
Input
Spread Spectrum
Output
W166
(EMI suppressed)
3.3V or 5V
W
8
7
6
5
1
2
3
4
CLKIN
NC
GND
FS1
SSON#
CLKOUT
FS0
VDD
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