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AT45DB021A Datasheet(PDF) 2 Page - ATMEL Corporation |
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AT45DB021A Datasheet(HTML) 2 Page - ATMEL Corporation |
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2 / 28 page  AT45DB021A 2 memories that are accessed randomly with multiple address lines and a parallel interface, the DataFlash uses a serial interface to sequentially access its data. The simple serial interface facilitates hardware layout, increases sys- tem reliability, minimizes switching noise, and reduces package size and active pin count. The device is optimized for use in many commercial and industrial applications where high density, low pin count, low voltage, and low power are essential. Typical applications for the DataFlash are digital voice storage, image storage, and data storage. The device operates at clock frequencies up to 13 MHz with a typical active read current consumption of 4 mA. To allow for simple in-system reprogrammability, the AT45DB021A does not require high input voltages for pro- gramming. The device operates from a single power supply, 2.7V to 3.6V, for both the program and read opera- tions. The AT45DB021A is enabled through the chip select pin (CS) and accessed via a three-wire interface consisting of the Serial Input (SI), Serial Output (SO), and the Serial Clock (SCK). All programming cycles are self-timed, and no separate erase cycle is required before programming. Block Diagram Memory Array To provide optimal flexibility, the memory array of the AT45DB021A is divided into three levels of granularity comprised of sectors, blocks and pages. The Memory Architecture Diagram illustrates the breakdown of each level and details the number of pages per sector and block. All program operations to the DataFlash occur on a page- by-page basis; however, the optional erase operations can be performed at the block or page level. FLASH MEMORY ARRAY PAGE (264 BYTES) BUFFER 2 (264 BYTES) BUFFER 1 (264 BYTES) I/O INTERFACE SCK CS RESET VCC GND RDY/BUSY WP SO SI |
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