Cypress Offers Field-Programmable Spread-Spectrum Clock Generators

9/23/2003 - Cypress Semiconductor Corporation (NYSE: CY), a world leader in timing-technology solutions, introduced the industry’s first field-programmable spread-spectrum clock generators (SSCGs). In an effort to provide a complete SSCG solution, Cypress also announced the availability of a programming kit (CY3672-PRG) as well as a socket-adaptor (CY3690/91) to accompany the CY25100SC and CY25100ZC. The SSCG and programming kit combination enables versatile programming whereby a single device can replace hundreds of fixed-function SSCGs.

Clocks used in digital systems, such as laser and ink jet printers, LCD panels, and personal computers, are one of the primary sources of unwanted electromagnetic interference (EMI). Energy peaks, resulting from increasing frequencies and faster edge rates, become the source of EMI. Spread-spectrum clock generators reduce the peak energy by slowly modulating the clock frequency.

Cypress is the only company to offer field-programmable SSCGs, enabling the designer to adjust the programmable input clock frequencies and modulation amount (spread percent) to reduce EMI levels with ease. The programmable spread-spectrum EMI reduction capability and other timing functions including frequency synthesis are integrated into the CY25100SC and CY25100ZC, significantly enhancing system performance by eliminating the need for expensive crystal oscillators, thereby reducing system cost while reducing EMI levels.

“It’s not a question of whether or not your system has EMI, it’s a matter of how much EMI you have and how you are going to minimize it,” said Cavit Ozdalga, marketing manager for Cypress's Timing Technology Division. “By using programmable spread-spectrum technology over alternative solutions such as shielding or filtering, Cypress provides the maximum amount of EMI reduction across the entire system. Even more importantly, Cypress enables designers to program the device so that they can chose exactly how much EMI reduction is required to optimize their system during the electromagnetic compliance (EMC) tests thereby eliminating the need for expensive and time consuming redesign cycles”.

The CY25100 offers a wide operating output frequency range, which enables designers to program the EMI reduction from 3 to 200 MHz. In order to meet regulatory agency electromagnetic compliance (EMC) requirements, programmable spread-spectrum feature provide a wide range of down or center spread percentages (0.5 to 5.0%) for maximum EMI reduction. Depending on the application, the CY25100 provides up to 20 dB EMI reduction using a worst case harmonic.

Programming Kit and Socket Adapter
The CY3672 programming kit enables any user with a personal computer (PC) the ability to program the CY25100 quickly and easily. The only two setup requirements are a power connection and a parallel port connection with the PC. The CY3672 offers quick and easy prototyping using a Microsoft® Windows® 95, 98, NT, 2K, ME, and XP compatible interface. The CY3690/91 socket adapter rounds out the complete SSCG solution providing designers with the ability to program the chip right at their desktop.

Pricing and Availability
Samples of both the CY25100ZC and CY25100SC are available now. The CY25100ZC is available in a space-saving 8-pin TSSOP package. The CY25100SC is available in an 8-pin SOIC package. Prices range from $1.75 to $1.55 per unit in 1,000 unit quantities.

The CY3672-PRG programming kit is available now for $200.00. The CY3690 and CY3691 socket adaptor kits for TSSOP and SOIC packages are available today for $70.00 each.

For more information on SSCG products, visit the Cypress website at

About Cypress
Cypress Semiconductor Corporation (NYSE: CY) is Connecting From Last Mile to First MileTM with high-performance solutions for personal, network access, enterprise, metro switch, and core communications-system applications. Cypress ConnectsTM using wireless, wireline, digital, and optical transmission standards, including USB, Fibre Channel, SONET/SDH, Gigabit Ethernet, and DWDM. Leveraging its process and system-level expertise, Cypress makes industry-leading physical layer devices, framers, and network search engines, along with a broad portfolio of high-bandwidth memories, timing technology solutions, and reconfigurable mixed-signal arrays. More information about Cypress is accessible online at

Cypress and the Cypress logo are registered trademarks of Cypress Semiconductor Corporation. “Connecting From Last Mile to First Mile” and “Cypress Connects” are trademarks of Cypress.

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