High speed SDRAMs increase portable electronics battery life

18th April 2017

Alice Matthews

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A new line of high-speed CMOS mobile low-power DDR2 (LPDDR2) SDRAMs has been introduced by Alliance Memory. They have densities of 1Gb, 2Gb, and 4Gb in the 134-ball FBGA package. The devices offer a variety of power-saving features, including 1.2/1.8V operating voltages, to extend battery life in portable electronics, while their high density enables slim designs. The LPDDR2 SDRAMs provide reliable drop-in, pin-to-pin compatible replacements for a number of similar solutions in ultra-low-voltage cores and I/O power supplies for mobile devices such as smartphones and tablets.

For these products, the ICs feature auto Temperature-Compensated Self-Refresh (TCSR) to minimise power consumption at lower ambient temperatures. In addition, their Partial-Array Self-Refresh (PASR) feature reduces power by only refreshing critical data, while a Deep Power Down (DPD) mode provides an ultra-low power state when data retention isn't required.

Featuring a double data rate four-bit prefetch architecture, the LPDDR2 SDRAMs deliver high-speed operation with clock rates of 400 and 533MHz, and are available in commercial (-30 to 85°C) and industrial (-40 to 85°C) temperature ranges. The devices offer programmable read or write burst lengths of 4, 8, or 16; an auto pre-charge function provides a self-timed row pre-charge initiated at the end of the burst sequence. Easy-to-use refresh functions include auto- or self-refresh. The RoHS-compliant ICs are lead (Pb)- and halogen-free.

Alliance Memory offers an extensive line-up of mobile low-power SDRAMs to help designers meet the demand for reduced power consumption in portable electronics, including 64, 128, 256, 512M, and 1GB LPDDR1 SDRAMs and 16GB LPDDR3 SDRAMs. 8GB 256M x 32 LPDDR2 SDRAMs in the 134-ball FBGA package will also be available soon.