AT45DB021B Datasheet | Atmel

Features - - - - Single 2.7V - 3.6V Supply Serial Peripheral Interface (SPI) patible 20 MHz Max Clock Frequency Page Program Operation - Single Cycle Reprogram (Erase and Program) - 1024 Pages (264 Bytes/Page) Main Memory Supports Page and Block Erase Operations Two 264-byte SRAM Data Buffers - Allows Receiving of Data while Reprogramming of Nonvolatile Memory Continuous Read Capability through Entire Array - Ideal for Code Shadowing Applications Low Power Dissipation - 4 m A Active Read Current Typical - 2 µA CMOS Standby Current Typical Hardware Data Protection Feature 100% patible to AT45DB021 and AT45DB021A 5.0V-tolerant Inputs: SI, SCK, CS, RESET and WP Pins mercial and Industrial Temperature Ranges Green (Pb/Halide-free/Ro HS pliant) Packaging Options - - - - 2-megabit 2.7-volt Only Data Flash® AT45DB021B - - - - - 1. Description The AT45DB021B is a 2.7-volt only, serial interface Flash memory ideally suited for a wide variety of digital voice-, image-, program code- and data-storage applications. Its 2,162,688 bits of memory are organized as 1024 pages of 264 bytes each. In addi.. tion to the main memory, the AT45DB021B also contains two SRAM data buffers of 264 bytes each. The buffers allow receiving of data while a page in the main memory is being reprogrammed, as well as reading or writing a continuous data stream. EEPROM emulation (bit or byte alterability) is easily handled with a selfcontained three step Read-Modify-Write operation. Unlike conventional Flash memories that are accessed randomly with multiple address lines and a parallel interface, the Data Flash uses a SPI serial interface to sequentially access its data. Data Flash supports SPI mode 0 and mode 3. The simple serial interface facilitates hardware layout, increases system reliability, minimizes switching noise, and reduces package size and active pin count. The device is optimized for use in many mercial and industrial applications where high density, low pin count, low voltage, and low...