W180
W180 is Peak Reducing EMI Solution manufactured by Cypress.
Features
- Cypress PREMIS™ family offering
- Generates an EMI optimized clocking signal at the output
- Selectable output frequency range
- Single 1.25% or 3.75% down or center spread output
- Integrated loop filter ponents
- Operates with a 3.3V or 5V supply
- Low power CMOS design
- Available in 8-pin SOIC (Small Outline Integrated Circuit) Table 1. Modulation Width Selection SS% 0 1 W180-01, 02, 03 Output Fin ≥ Fout ≥ Fin
- 1.25% Fin ≥ Fout ≥ Fin
- 3.75% W180-51, 52, 53 Output Fin + 0.625% ≥ Fin≥
- 0.625% Fin + 1.875% ≥ Fin≥
- 1.875%
Table 2. Frequency Range Selection W180 Option# FS2 0 0 1 1 FS1 0 1 0 1 -01, 51 (MHz) 8 ≤ FIN ≤ 10 10 ≤ FIN ≤ 15 15 ≤ FIN ≤ 18 18 ≤ FIN ≤ 28 -02, 52 (MHz) 8 ≤ FIN ≤ 10 10 ≤ FIN ≤ 15 N/A N/A -03, 53 (MHz) N/A N/A 15 ≤ FIN ≤ 18 18 ≤ FIN ≤ 28
Key Specifications
Supply Voltages: VDD = 3.3V±5% or VDD = 5V±10% Frequency Range: 8 MHz ≤ Fin ≤ 28 MHz Cycle to Cycle Jitter: 300 ps (max.) Selectable Spread Percentage: 1.25% or 3.75% Output Duty Cycle: 40/60% (worst case) Output Rise and Fall Time: 5 ns (max.)
Simplified Block Diagram
3.3V or 5.0V
Pin Configurations
SOIC W180-01/51 CLKIN or X1 NC or X2 GND SS% 1 2 3 4 8 7 6 5 FS2 FS1 VDD CLKOUT
X1 XTAL Input
X2
Spread Spectrum Output (EMI suppressed)
W180-02/03 W180-52/53
CLKIN or X1 NC or X2 GND SS%
1 2 3 4
8 7 6 5
SSON# FS1 VDD CLKOUT
3.3V or 5.0V
Oscillator or Reference Input
Spread Spectrum Output (EMI suppressed)
PREMIS is a trademark of Cypress Semiconductor Corporation.
Cypress Semiconductor Corporation
- 3901 North First Street
- San Jose
- CA 95134
- 408-943-2600 July 21, 2000, rev.
- A
Pin Definitions
Pin Name CLKOUT CLKIN or X1 Pin No. 5 1 Pin Type O I Pin...