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W42C32-05 Datasheet

  • W42C32-05

  • Spread Spectrum Frequency Timing Generator

  • 8頁

  • CYPRESS

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W42C32-05
Spread Spectrum Frequency Timing Generator
Features
鈥?Maximized EMI suppression using Cypress鈥檚 Spread
Spectrum technology
鈥?Generates a spread spectrum timing signal
鈥?Reduces measured EMI by as much as 12 dB
鈥?Integrated loop filter components
鈥?Requires a single low-cost fundamental crystal (or
other frequency reference) for proper operation
鈥?Special spread spectrum control functions
鈥?Low-power CMOS design
鈥?Available in 16-pin SOIC package, (300 mil)
Key Specifications
Cycle-to-Cycle Jitter .................................................... 250 ps
45/55 Duty Cycle .................................... approximately 1.4V
Selectable Frequency spread
2 ns rise/fall time 0.4V to 2.0V, 3.3V supply
2 ns rise/fall time 0.8V to 2.4V, 5.0V supply
Table 1. Frequency Spread Selection
W42C32-05
FS2
0
0
0
0
1
1
1
1
FS1
0
0
1
1
0
0
1
1
FS0
0
1
0
1
0
1
0
1
14.318
REFOUT
(MHz)
22.1148
22.1148
14.7456
18.432
14.318
CLKOUT
(MHz)
44.2296 鹵
2.5%
44.2296
鹵1.5%
29.4912 鹵
2.5%
18.432 鹵 2.5%
66.66 鈥?2%
Reserved
100 鈥?2%
Reserved
VDD
(V)
5.0
5.0
5.0
5.0
3.3
3.3
3.3
3.3
Overview
The W42C32 modulates the output of a single PLL in order to
鈥榮pread鈥?the bandwidth of a synthesized clock and, more im-
portantly, decrease the peak amplitudes of its fundamental
harmonics. Since peak amplitudes are reduced, the radiated
electromagnetic emissions of the W42C32-05 are significantly
lower than the typical narrow band signal produced by oscilla-
tors and most frequency generators. Lowering a signal鈥檚 am-
plitude by increasing its bandwidth is a method of reducing
EMI called 鈥榮pread spectrum frequency timing generation鈥?
This patented technique not only reduces the emissions of the
primary clock, but also impacts every signal synchronized to it.
Pin Configuration
SOIC
PD#
X1
X2
GND
AGND
FS0
TEST
CLKOUT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
REFOUT
FS2
FS1
SSON#
RESET
VDD
AVDD
REFEN#
W42C32-05
Cypress Semiconductor Corporation
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?/div>
408-943-2600
September 28, 1999, rev. **

W42C32-05相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
    版本
    描述
    廠商
    下載
  • 英文版
    Specialty Clock Generator
    Cypress
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS [C...
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS [C...
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS [C...
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS [C...
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS [C...
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS [C...
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS [C...
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS [C...
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS [C...
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS
  • 英文版
    Spread Spectrum Frequency Timing Generator
    CYPRESS [C...
  • 英文版
    Spread Spectrum Frequency Timing Generator
    Cypress
  • 英文版
    Clock Driver
    ETC
  • 英文版
    IC CLK EMI REDUCTION SSCG 8-SOIC
    Cypress Semiconductor

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