Renesas annouces breakthrough circuit tech for embedded STT-MRAM MCUs

Renesas Electronics said it has developed cutting-edge circuit technologies for an embedded Spin-Transfer Torque Magnetoresistive Random-Access Memory (STT-MRAM) test chip, boasting fast read and write operations. These advancements, presented at the International Solid-State Circuits Conference 2024 (ISSCC 2024), aim to address the escalating demand for higher performance microcontroller units (MCUs) in IoT and AI applications. Renesas introduces innovative circuit mechanisms to achieve faster read operations in MRAM. Renesas also enhances the write throughput of embedded STT-MRAM by optimizing the write voltage application process. Here below is the explanation Renesas provided in achieving better read and write of data into MRAM: Fast Reading: MRAM reading is generally performed by a differential amplifier (sense amplifier) to determine which of the memory cell current or the reference current is larger. However, because the difference in memory cell currents between the 0 and 1 states (the read window) is smaller for MRAM than for flash memory, the reference current must be precisely positioned in the center of the read window for faster reading. The newly developed technology introduces two mechanisms. The first mechanism aligns the reference current in the center of the window according to the actual current distribution of the memory cells for each chip measur...