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PDF ( 数据手册 , 数据表 ) W42C31

零件编号 W42C31
描述 Spread Spectrum Frequency Timing Generator
制造商 Cypress Semiconductor
LOGO Cypress Semiconductor LOGO 


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W42C31 数据手册, 描述, 功能
W42C31-03
Spread Spectrum Frequency Timing Generator
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 5V supply
• Low power CMOS design
• Available in 8-pin SOIC (Small Outline Integrated
Circuit)
Overview
The W42C31-03 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.
Simplified Block Diagram
5.0V
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
W42C31-03
FS1 FS0
00
01
10
11
Oscillator
Input
Frequency
(MHz)
10 to 20
10 to 20
20 to 33
20 to 33
XTAL Input
Frequency
(MHz)
Output
Frequency
(MHz)
10 to 20
10 to 20
20 to 25
20 to 25
fIN ±1.875%
fIN ±1.0%
fIN ±1.875%
fIN –2.0%
Pin Configuration
XTAL
Input
X1
X2 W42C31-03
Spread Spectrum
Output
(EMI suppressed)
X1
X2
GND
FS0
SOIC
1 8 OE#
2 7 FS1
3 6 VDD
4 5 CLKOUT
5.0V
Oscillator or Reference
Input
W42C31-03
Spread Spectrum
Output
(EMI suppressed)
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
September 28, 1999, rev. **












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