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參數資料
| 型號： | W42C31-09 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Spread Spectrum Frequency Timing Generator(寬頻譜頻率同步產生器) |
| 中文描述： | 擴頻頻率定時發生器（寬頻譜頻率同步產生器） |
| 文件頁數： | 1/7頁 |
| 文件大小： | 119K |
| 代理商： | W42C31-09 |
Spread Spectrum Frequency Timing Generator
W42C31-09
Cypress Semiconductor Corporation
3901 North First Street
San Jose
CA 95134
408-943-2600
January 25, 2000, rev. *B
Features
Maximized EMI suppression using Cypress’s Spread
Spectrum technology
Generates a spread spectrum copy of the provided
input
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)
Overview
The W42C31-09 incorporates the latest advances in PLL
spread spectrum frequency synthesizer techniques. By fre-
quency modulating the output with a low-frequency carrier,
EMI is greatly reduced. Use of this technology allows systems
to pass increasingly difficult EMI testing without resorting to
costly 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
W42C31-09
Input Frequency
(MHz)
Output Frequency
(MHz)
FS1
FS0
0
0
30 to 55
f
IN
±0.625%
f
IN
±1.25%
f
IN
±2.5%
f
IN
–3.75%
0
1
30 to 55
1
0
30 to 55
1
1
30 to 55
Simplified Block Diagram
Pin Configuration
SOIC
Oscillator or Reference
Input
Spread Spectrum
W42C31-09
(EMI suppOutput
VDD
W
8
7
6
5
1
2
3
4
CLKIN
NC
GND
FS1
SSON#
CLKOUT
FS0
VDD
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PDF描述 |
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| W42C32-05 | Spread Spectrum Frequency Timing Generator(寬頻譜頻率定時發生器) |
| W42C32 | Spread Spectrum Frequency Timing Generator |
| W455F05 | 4 Mbit Uniform Sector, Serial Flash Memory |
| W455F10 | 4 Mbit Uniform Sector, Serial Flash Memory |
| W455F20 | 4 Mbit Uniform Sector, Serial Flash Memory |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W42C31-09G | 制造商:Cypress Semiconductor 功能描述:PLL Frequency Synthesizer Single 8-Pin SOIC |
| W42C31-09GT | 制造商:Cypress Semiconductor 功能描述:SPREAD SPECTRUM FREQUENCY TIMING GENERATOR |
| W42C32 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Spread Spectrum Frequency Timing Generator |
| W42C32-05 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Spread Spectrum Frequency Timing Generator |
| W42C32-05MG | 制造商:Cypress Semiconductor 功能描述:PREMIS EMI REDUCTION SSCGS |
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