Exar Releases New DDR 3 SDRAM Memory Bus Termination Regulator

Active Termination Provides Signal and Data Integrity during Data Access for DDR 1, 2 and 3 Memories

Sep 26, 2011, 07:45 ET from Exar Corporation

FREMONT, Calif., Sept. 26, 2011 /PRNewswire/ -- Exar Corporation (Nasdaq: EXAR) unveiled today a SDRAM memory bus termination regulator supporting the latest DDR 3 SDRAM standard (SSTL-15).

The XRP2997 provides a simple and economical solution for implementing an active bus termination in all equipment and applications using the latest DDR3 SDRAM memories such as set top boxes, video and graphic cards and mother boards. Usage of such active termination on increasingly faster double data rate memory data busses prevents data reflection and ultimately read/write data corruption.  The XRP2997 is also equally capable of supporting the former DDR1 and DDR2 SDRAM memory types.

"DDR3 memories are now the standard for equipment requiring fast access to memory banks," said Eric Pittana, director of marketing, Power Product Line. "The XRP2997 is a simple and low cost solution that prevents the data access corruption typically caused by longer lengths of memory interconnects and the multiple stubs that are required for supporting these memory devices."

Key Product Features

With a capability of sourcing and sinking up to 2A, and 2.4A peak, the XRP2997 bus termination regulator generates a tightly regulated low noise 0.75V+/-20mV VTT voltage as required by the DDR3 SDRAM (SSTL-15) standard. It converts input voltages as low as 1.1V while the output voltage is adjustable through an external resistor divider or by forcing the VREF pin voltage. Only requiring an output capacitance of 22uF to operate, power-up sequencing is achieved via an enable function and a soft start feature. Built-in source/sink over-current, over-temperature and under-voltage lockout protections insure safe operation under abnormal operating conditions. The XRP2997 is pin and function compatible to Exar's DDR2 SP2996B device and provides an upgrade to support DDR3 memories.

Power Management Products

Highly reliable, accurate, power management is a critical part of any technology system. Exar has a broad array of high-performance and industry-proven power management solutions including handset and lighting controls, power conversion, and standard linear devices.

Prices, Packages, Availability and Additional Information

The XRP2997 is available now in volume quantities and offered in a RoHS compliant, "green" halogen free exposed pad 8-pin SOIC package. Pricing starts at $0.34 for 1K units.

Additional information on the XRP2997 product can be found at:


Additional information on Exar's other power distribution switches can be found at


About Exar

Exar Corporation delivers highly differentiated silicon, software and subsystem solutions for data communication, storage, consumer and industrial applications. For over 40 years, Exar's comprehensive knowledge of end-user markets along with the underlying analog, mixed signal and digital technology has enabled innovative solutions that meet the needs of the evolving connected world. Exar's product portfolio includes power management and interface components, communications products, storage optimization solutions, network security and applied service processors. Exar has locations worldwide providing real-time customer support to drive rapid product development. For more information about Exar, visit: www.exar.com.

SOURCE Exar Corporation