Alliance Memory LPDDR4 SDRAMs Cut Power Consumption, Up Performance

By Rich Nass

Executive Vice President

Embedded Computing Design

February 08, 2021


Alliance Memory LPDDR4 SDRAMs Cut Power Consumption, Up Performance
(Image Courtesy of Alliance Memory)

Alliance Memory recently expanded its offering of high-speed CMOS mobile low-power SDRAMs with new LPDDR4 devices that all feature on-chip ECC.

For improved performance with higher power efficiency than previous-generation LPDDR3 SDRAMs, the 2-Gbit AS4C128M16MD4-062BAN, 4-Gbit AS4C256M16MD4-062BAN and AS4C128M32MD4-062BAN, and 8-Gbit AS4C256M32MD4-062BAN offer lower power consumption and faster speeds as compared to previous generations. All the devices are offered in 200-ball FBGA packages.

With operation 1.1/1.8 V, the devices increase battery life in portable electronics for the consumer and industrial markets, including tablets, wearables, handheld gaming consoles, personal navigation systems, and more. Providing increased efficiency for advanced audio and high-resolution video in embedded applications, the LPDDR4 SDRAMs deliver clock speeds of 1.6 GHz for transfer rates of 3.2Gbits/s. For automotive applications, including infotainment and ADAS systems, the AEC-Q100 qualified devices operate over a temperature range of -40°C to +105°C.

The LPDDR4 SDRAMs are organized as one channel (AS4C128M16MD4-062BAN and AS4C256M16MD4-062BAN) and two channels (AS4C128M32MD4-062BAN and AS4C256M32MD4-062BAN) per device, with individual channels consisting of eight banks of 16 bits. The components offer fully synchronous operation; programmable read and write burst lengths of 16, 32, and on the fly; and selectable output drive strength. An on-chip temperature sensor controls the self-refresh rate.

Samples and production quantities are available now, with lead times of eight weeks. Pricing for U.S. delivery starts at $6.00 per piece for 2-Gbit devices; $12 for 4-Gbit devices; and $16 for 8-Gbit devices.

Richard Nass’ key responsibilities include setting the direction for all aspects of OSM’s ECD portfolio, including digital, print, and live events. Previously, Nass was the Brand Director for Design News. Prior, he led the content team for UBM’s Medical Devices Group, and all custom properties and events. Nass has been in the engineering OEM industry for more than 30 years. In prior stints, he led the Content Team at EE Times,, and TechOnLine. Nass holds a BSEE degree from NJIT.

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