LPDDR – Low Power Double Data Rate refers to low power DRAM for mobile devices such as smart phones and tablets. It’s aimed at minimizing power consumption and features low voltage operation. LPDDR5X DRAM is the 7th generation product The ‘double data rate’ term refers to it transferring data on both the rise and fall of the clock signal. LPDDR standards are managed by JEDEC.
- LPDDR1 – 1.8 volts compared to DDR1’s 2.5 volts. Two clock speeds;200MHz and 266.7MHz in LPDDR1E. Data transfer rate of 400MTs or 533.3MTs with a prefetch size of 2n.
- LPDDR2 -1.2V or 1.8V in the LPDDR2E version. Clock speeds: 400MHz or 533.3MHz. Allowed for double the transfer rate of 800MTs or 1,067MTs, respectively, with a prefetch size of 4n.
- LPDDR3 – same 1.2 or 1.8 volts as LPDDR2. JEDEC doubled the prefetch size to 8n, allowing the I/O clock rate and transfer rate to double. Data transfer rates rose to 1,600MTs or 2,133MTs for the LPDDR3E variant.
- LPDDR4 – 1.1 or 1.8 volts, while the LPDDR4X variant had lower power state of 0.6 volts. JEDEC doubled the prefetch size and changed I/O bus from a single 32-bit bus to a pair of 16-bit buses. 3,200MTs transfer rate with LPDDR4X variant offering 4,267MTs transfer speeds.
- LPDDR5 – 0.5 volts, 1.05 volts, or 1.8 volts. Kept same prefetch size as LPDDR4 of 16n but doubled transfer rate to 6,400Mts. LPDDR5X, added an 8,533MTs transfer speed.
