ICs support speedy R-DIMM designs

Integrated Device Technology has introduced a range of new products for DDR2-667 registered dual inline memory modules.

Integrated Device Technology has introduced a range of new products for DDR2-667 registered dual inline memory modules (R-DIMMs).

The new products include a set of phase-locked loop (PLL) clock drivers and register products, as well as the industry's only DDR2-667MHz register validation board (RVB).

IDT offers customers an entire range of DIMM products and test platforms.

Typical applications for R-DIMMs are workstations, servers, storage and telecommunication products, such as routers.

The DDR2-667 RVB was designed by IDT as part of the JEDEC Validation Task Group to ensure that components deliver performance that meets the stringent industry requirements dictated by current JEDEC standards.

The new DDR2 register and PLL products can handle operating frequencies up to 667MHz.

The expanded IDT product offering includes a PLL clock driver used for synchronisation of input clock signals from the system motherboard to all SDRAMs on the DIMM.

The device requires no external components and is optimised for very low phase error, dynamic phase offset, static phase offset, skew and jitter, while maintaining frequency and duty cycle over the operating voltage and temperature range.

The new register drives the address signals and supports 1:1 (25bit) and 1:2 (14bit) configurations, allowing designers to work with a single device for multiple DIMM configurations.

The register optimises the DDR2 DIMM load by delivering proprietary output edge-control circuitry that offers minimal switching noise in un-terminated lines for exceptional signal integrity and unmatched performance.

The device also supports low-power standby operation, making it ideal for use in systems with strict low-power-consumption requirements.

The devices are spread-spectrum tolerant, enabling reduced electromagnetic interference for higher reliability in mission-critical networking applications.

IDT is a leading provider of clock management and logic solutions, and has leveraged its core competencies to develop a full array of products for the registered DIMM market.

In addition to the new DDR2-667 products, IDT designed the DDR2-400/533 RVB for the industry and was first to introduce a complete chip set of JEDEC-compliant DDR2-400/533 registers and PLL for registered DIMMs.

The devices target registered DDR2 DIMMs that address the memory needs of growing market areas, such as servers, workstations and communication devices.

The new IDT-developed DDR2-667 register validation platform enables the analysis of the pre- and post-register address bus of the registered DIMMs to ensure optimum performance.

The RVB also allows users to observe simultaneous switching behaviour of the register on a DIMM by way of a quick, easy and accurate test that simulates real-life specific or worst-case address scenarios, enabling the customer to perform robust testing and analysis.

In addition to register testing, the RVB has the ability to control additional factors in the test environment, including DIMM voltage, reference voltages, clock speeds and timing relationships between the clocks and address and control signals.

Alternative methods of register testing include actual DIMM testers, bench tests and testing houses.

However, using these approaches makes it difficult for customers to evaluate registers on a standard platform.

The IDT DDR2 RVB enables an easy and accurate testing environment that is very much like the final application.

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