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LPDDR
Low-Power Double Data Rate (LPDDR) is a type of synchronous dynamic random-access memory (SDRAM) designed to use less power than conventional memory. It is commonly used in smartphones, tablet computers, and laptops, where reducing power consumption is important for battery life. For this reason, earlier versions of the technology were also known as Mobile DDR.
LPDDR differs from standard DDR SDRAM in both design and features, with changes that make it more suitable for mobile devices. Unlike DDR, which is typically installed in removable modules, LPDDR is usually soldered directly onto the device’s motherboard to conserve space and improve efficiency, but this design prevents later upgrades. Although LPDDR uses a generational naming convention similar to that of DDR memory (such as LPDDR4 and DDR4), the two follow separate development standards, and the version numbers do not indicate that they share the same technologies. The LPDDR standard is developed and maintained by the JEDEC Solid State Technology Association.
In contrast with standard SDRAM, used in stationary devices and laptops and usually connected over a 64-bit wide memory bus, LPDDR also permits 16- or 32-bit wide channels.
The "E" and "X" versions mark enhanced versions of the specifications. They formalize overclocking the memory array by usually 33%.
As with standard SDRAM, most generations double the internal fetch size and external transfer speed. (DDR4 and LPDDR5 being the exceptions.)
The original low-power DDR (sometimes retroactively called LPDDR1), released in 2006 is a slightly modified form of DDR SDRAM, with several changes to reduce overall power consumption.
Most significantly, the supply voltage is reduced from 2.5 to 1.8 V. Additional savings come from temperature-compensated refresh (DRAM requires refresh less often at low temperatures), partial array self refresh, and a "deep power down" mode which sacrifices all memory contents. Additionally, chips are smaller, using less board space than their non-mobile equivalents. Samsung and Micron are two of the main providers of this technology, which is used in tablet and phone devices such as the iPhone 3GS, original iPad, Samsung Galaxy Tab 7.0 and Motorola Droid X.
In 2009, the standards group JEDEC published JESD209-2, which defined a more dramatically revised low-power DDR interface. It is not compatible with either DDR1 or DDR2 SDRAM, but can accommodate any one of:
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LPDDR
Low-Power Double Data Rate (LPDDR) is a type of synchronous dynamic random-access memory (SDRAM) designed to use less power than conventional memory. It is commonly used in smartphones, tablet computers, and laptops, where reducing power consumption is important for battery life. For this reason, earlier versions of the technology were also known as Mobile DDR.
LPDDR differs from standard DDR SDRAM in both design and features, with changes that make it more suitable for mobile devices. Unlike DDR, which is typically installed in removable modules, LPDDR is usually soldered directly onto the device’s motherboard to conserve space and improve efficiency, but this design prevents later upgrades. Although LPDDR uses a generational naming convention similar to that of DDR memory (such as LPDDR4 and DDR4), the two follow separate development standards, and the version numbers do not indicate that they share the same technologies. The LPDDR standard is developed and maintained by the JEDEC Solid State Technology Association.
In contrast with standard SDRAM, used in stationary devices and laptops and usually connected over a 64-bit wide memory bus, LPDDR also permits 16- or 32-bit wide channels.
The "E" and "X" versions mark enhanced versions of the specifications. They formalize overclocking the memory array by usually 33%.
As with standard SDRAM, most generations double the internal fetch size and external transfer speed. (DDR4 and LPDDR5 being the exceptions.)
The original low-power DDR (sometimes retroactively called LPDDR1), released in 2006 is a slightly modified form of DDR SDRAM, with several changes to reduce overall power consumption.
Most significantly, the supply voltage is reduced from 2.5 to 1.8 V. Additional savings come from temperature-compensated refresh (DRAM requires refresh less often at low temperatures), partial array self refresh, and a "deep power down" mode which sacrifices all memory contents. Additionally, chips are smaller, using less board space than their non-mobile equivalents. Samsung and Micron are two of the main providers of this technology, which is used in tablet and phone devices such as the iPhone 3GS, original iPad, Samsung Galaxy Tab 7.0 and Motorola Droid X.
In 2009, the standards group JEDEC published JESD209-2, which defined a more dramatically revised low-power DDR interface. It is not compatible with either DDR1 or DDR2 SDRAM, but can accommodate any one of: