Adesto Technologies Corporation, Inc. Memory AT25DF256-SSHNGU-B

The AT25DF256-SSHNGU-B is a 256-Kbit SPI serial flash memory device from Quarktwin Technology Ltd. It operates with a supply voltage range of 1.65V to 3.6V and supports SPI modes 0 and 3, with a maximum operating frequency of 104 MHz. The device features dual-output read capability, allowing for faster data retrieval. This memory device is designed with a flexible erase architecture, offering small page erase sizes of 256 bytes, as well as uniform block erase options of 4 Kbytes and 32 Kbytes. It includes a hardware-controlled write protection feature and a one-time programmable security register for unique device serialization and key storage. The typical page program time is 1.5 ms for 256 bytes, while the block erase times are 50 ms for 4 Kbytes and 350 ms for 32 Kbytes. The AT25DF256-SSHNGU-B is characterized by low power consumption, with a typical deep power-down current of 5 µA and a standby current of 25 µA. It has an endurance of 100,000 program/erase cycles and a data retention period of 20 years. The device is available in various package options, including an 8-lead SOIC and an 8-pad ultra-thin DFN package, and complies with industry standards for environmental safety.