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102 I-CONNECT007 MAGAZINE I MARCH 2026 as either volatile or non-volatile. Volatile memories lose their stored data when power is removed, as seen in dynamic RAM (DRAM) and static RAM (SRAM). Non-volatile memories, by contrast, retain their contents even without power; flash memory is a common example. Modern memory technologies often balance trade-offs to achieve higher performance. DRAM offers high capacity and density, but its volatility re- quires constant refreshing every few milliseconds, increasing energy consumption. SRAM is faster but also volatile, and its relatively large cell size limits large-scale integration. Flash memory suffers from limited write endurance, slow erase cycles, scaling difficulties, and declining data retention as cells shrink. All three (DRAM, SRAM, and flash) store data as electrical charge. As these technologies scale to- ward the 10-nm node, maintaining sufficient charge becomes difficult, leading to reliability issues, higher leakage, and shrinking noise margins. The refresh power required by DRAM, together with the inherent leakage in both DRAM and SRAM, fur- ther constrains their suitability for future memory architectures. Why ReRAM is emerging as the better choice and the strengths behind it: • Speed: Switching resistance states happens extremely fast, giving ReRAM the potential to outperform NAND flash and even approach DRAM-like speeds • Endurance: It tolerates far more write cycles than flash, making it attractive for AI, edge devices, and high-duty workloads • Low power: It writes at very low voltages, requires no stand-by power, and is ideal for mobile, IoT, and battery-sensitive systems • Density and scalability: The cell structure is tiny and stackable, allowing much higher storage density as traditional flash approach- es its physical limits • CMOS-friendly manufacturing: It integrates cleanly with existing semiconductor process- es, reducing cost and easing adoption. ReRAM stores data by modulating the electrical resistance of a thin metal-oxide layer sandwiched between two electrodes. Rather than holding charge like DRAM or trapping electrons like flash, it operates by forming and dissolving nanoscale conductive paths within the dielectric material. At the device level, a ReRAM cell is a simple metal-insulator-metal (MIM) stack. When electri- cal pulses are applied, ions or oxygen vacancies migrate within the insulator, switching it between a low-resistance state (LRS) and a high-resistance state (HRS). These two stable resistance states represent binary data and remain intact even when power is removed. The application of an electrical field leads to the formation of conductive filaments through the insulator layer: • SET (write a "1"): A conductive filament forms between the electrodes. This puts the cell into a low-resistance state. • RESET (write a "0"): A reverse or lower-ener- gy pulse ruptures or thins the filament. The cell moves into a high-resistance state. Figure 2 illustrates the 3D structure of a ReRAM device. The top and bottom electrodes are con- nected by vertical pillars that can switch between B E YO N D D ES I G N Table 1: ReRAM offers several advantages over existing memory Figure 2: The 3D structure of a ReRAM device. (Source: Nanowerk.com)