AT45DB321D is a 2.7-volt, serial-interface sequential access Flash memory ideally suited for a wide variety of digital voice-, image-, program code- and data-stor- age applications. The AT45DB321D supports RapidS serial interface for applications requiring very high speed.
The AT45DB321D is a 32‑Mbit serial‑interface DataFlash memory that operates from a single 2.7 V to 3.6 V supply. It offers a RapidS™ serial interface with up to 66 MHz clock frequency, configurable page sizes of 512 or 528 bytes, and two SRAM buffers that allow data reception while re‑programming the main array. The device includes hardware and software data‑protection features, a 128‑byte security register, and a unique 64‑byte device identifier.
The datasheet provides pin configurations for SOIC, TSOP and MLF packages, a block diagram of the memory architecture, and detailed command descriptions for continuous array reads, page reads, buffer reads, and program/erase operations. Timing diagrams and electrical specifications are included to aid designers in integrating the part into voice, image, code, or data‑storage applications.
| Supply Voltage | 2.7 V – 3.6 V |
|---|---|
| Maximum Clock Frequency | 66 MHz |
| Memory Size | 32 Mbit (34,603,008 bits) |
| Page Size | 512 bytes or 528 bytes |
| Number of Pages | 8,192 |
| SRAM Buffers | 2 × 512/528 bytes |
| Active Read Current | 7 mA typical |
| Standby Current | 25 pA typical |
| Deep Power‑Down Current | 5 pA typical |
| Program/Erase Cycles | 100,000 per page minimum |
| Data Retention | 20 years |
It operates from a single 2.7 V to 3.6 V supply for both programming and reading.
The device supports a maximum serial‑interface clock frequency of 66 MHz.
The memory is organized into 8,192 pages.
The part contains two SRAM buffers, each 512 bytes or 528 bytes depending on the page size configuration.