W42C31-03G Cypress Semiconductor Corp, W42C31-03G Datasheet

CLOCK EMI REDUCTION SSCG 8-SOIC

W42C31-03G

Manufacturer Part Number
W42C31-03G
Description
CLOCK EMI REDUCTION SSCG 8-SOIC
Manufacturer
Cypress Semiconductor Corp
Type
Clock/Frequency Synthesizer, Spread Spectrum Clock Generatorr
Datasheet

Specifications of W42C31-03G

Pll
Yes
Input
Crystal
Output
Clock
Number Of Circuits
1
Ratio - Input:output
1:1
Differential - Input:output
No/No
Frequency - Max
33MHz
Divider/multiplier
Yes/No
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
33MHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
428-1397

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
W42C31-03G
Manufacturer:
CYPRESS/赛普拉斯
Quantity:
20 000
Features
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.
Cypress Semiconductor Corporation
• Maximized EMI suppression using Cypress’s Spread
• Generates a spread spectrum copy of the provided
• Integrated loop filter components
• Operates with a 5V supply
• Low power CMOS design
• Available in 8-pin SOIC (Small Outline Integrated
Simplified Block Diagram
Oscillator or Reference
Input
Spectrum technology
input
Circuit)
XTAL
Input
X1
X2
W42C31-03
W42C31-03
5.0V
5.0V
Spread Spectrum Frequency Timing Generator
(EMI suppressed)
(EMI suppressed)
Spread Spectrum
Output
3901 North First Street
Spread Spectrum
Output
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
0
0
1
1
Pin Configuration
FS0
0
1
0
1
San Jose
GND
FS0
X1
X2
Frequency
Oscillator
10 to 20
10 to 20
20 to 33
20 to 33
(MHz)
Input
1
2
3
4
SOIC
CA 95134
XTAL Input
Frequency
8
7
6
5
10 to 20
10 to 20
20 to 25
20 to 25
September 28, 1999, rev. **
(MHz)
OE#
FS1
VDD
CLKOUT
W42C31-03
f
f
f
f
IN
IN
IN
IN
408-943-2600
Frequency
±1.875%
±1.0%
±1.875%
–2.0%
Output
(MHz)

Related parts for W42C31-03G

W42C31-03G Summary of contents

Page 1

... 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 ...

Page 2

... For these reasons, spreading percentages between ±0.5% and ±2.5% are most common. The W42C31 features the ability to select from various spread spectrum characteristics. W42C31-03 are shown in Table 1. Other spreading character- istics are available (see separate data sheets) or can be cre- ated with a custom mask ...

Page 3

... An internal pull-down resistor defaults the chip into a mode in which all outputs are active. If OE# goes HIGH, all outputs are three-stated. The chip will not prevent short cycles in a transi- tion from three-state to enabled. will never be ex- MAX Time Figure 3. Modulation Waveform Profile 3 W42C31-03 SSFTG Typical Clock ...

Page 4

... All pins except X1, X2 [2] Pins X1 0°C to +70° 5V±10 Test Condition Input Clock V , 15-pF load 0.8–2 15-pF load 2.4–0.8 DD 15-pF load 4 W42C31-03 Rating Unit –0.5 to +7.0 V –65 to +150 ° +70 °C –55 to +125 °C 0.5 W Min Typ Max ...

Page 5

... R1 5V System Supply Package Name Package Type G 8-pin Plastic SOIC (150-mil) 5 W42C31-03 connection can be DD Output C3 0.1 µ µF Tantalum C1 XTAL load capacitors (optional; use is not required for operation). Typical value High frequency supply decoupling capacitor (0.1- µF recommended Common supply low frequency decoupling capacitor (10- µ ...

Page 6

... The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges. W42C31-03 ...

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