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We present a novel selector made of doped-chalcogenide material. This selector not only achieves low holding voltage (0.2 V) and large on/off ratio (>107), but also exhibits the high on-current density (>1.6 MA/cm2) and large hysteresis window (1.2 V). Besides, excellent selector performances with ultra-low off-state leakage current (10 pA), high switching speed (<10 ns), high endurance (>10...
This study proposes a 7T1R nonvolatile SRAM (nvSRAM) to 1) reduce store energy by using a single NVM device, 2) suppress DC-short current during restore operations through the use of a pulsed-overwrite (POW) scheme, and 3) achieves high restore yield by using a differentially supplied initialization (DSI) scheme. This initialization-and-overwrite (IOW) 7T1R nvSRAM improves breakeven-time (BET) by...
Critical switching current, Isw, of STT (Spin Transfer Torque)-MRAM has been reduced by several orders with perpendicular MTJ and the state-of-the-art write charge, Qw, becomes the order of 100–150fC. With the small Qw, MRAM starts to save energy consumption by 70–80% compared with a conventional memory system. Analysis of the write pulse-width dependence of Iw revealed a further potential of perpendicular...
In this work, we report a one-transistor (1T) versatile memory; the memory transistor characteristics achieve sub-60-mV/dec operation and considerably low off-state leakage of 10−15 A/µm at a supply voltage below 0.5V. The versatile memory features DRAM/NVM functions of large ΔVT window of 2.8V, fast 20-ns speed, 103s retention at 85°C, and long extrapolated 1016 endurance at 85°C, which show the...
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