Infineon/CYPRESS W42C31-04G

The W42C31-04 incorporates the latest advances in PLL spread spectrum frequency synthesizer techniques. By frequency 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 W42C31-04 uses a phase-locked loop (PLL) to frequency modulate an input clock. The result is an output clock whose frequency is slowly swept over a narrow band near the input signal. Because the modulating frequency is typically 1000 times slower than the fundamental clock, the spread spectrum process has little impact on system performance.

• Maximized EMI suppression using Cypress’s Spread Spectrum technology
• Generates a spread spectrum 2.3X copy of the input
• Integrated loop filter components
• Operates with a 5V supply
• Low power CMOS design
• Available in 8-pin SOIC (Small Outline Integrated Circuit)