The Microchip AT25320B-MAHL-E is a 32Kbit serial EEPROM with an SPI interface clocked at 20 MHz, organized as 4K x 8 bits. The 8-UDFN package with exposed pad (2x3 mm footprint) keeps board area small while the pad aids thermal transfer during write cycles.
Write cycle timing — 5 ms per page or word
The write cycle time is 5 ms for a word or page write. That is the non-volatile programming latency the host firmware must wait before the next SPI command. For parameter storage or configuration tables that update infrequently, 5 ms is well within a typical polling loop. For streaming writes, the part supports page writes (up to 32 bytes per page) to reduce total programming time.
Rated from 1.8V to 5.5V, this EEPROM works on both 3.3V and 5V buses without an external regulator. The 20 MHz SPI clock supports fast readback for firmware shadowing or boot-from-SPI configurations.
The base product number AT25320 covers a family of density and package variants, so a future density migration stays within the same SPI command set.