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AT45DB081B-CNC-2.5 Datasheet(PDF) 2 Page - ATMEL Corporation |
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AT45DB081B-CNC-2.5 Datasheet(HTML) 2 Page - ATMEL Corporation |
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2 / 32 page  2 AT45DB081B 2225C–12/01 stream. EEPROM emulation (bit or byte alterability) is easily handled with a self- contained three step Read-Modify-Write operation. Unlike conventional Flash memories that are accessed randomly with multiple address lines and a parallel interface, the DataFlash uses a SPI serial interface to sequentially access its data. DataFlash sup- ports 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 commercial and industrial applications where high density, low pin count, low voltage, and low power are essential. The device operates at clock frequencies up to 20 MHz with a typical active read current consumption of 4 mA. To allow for simple in-system reprogrammability, the AT45DB081B does not require high input voltages for programming. The device operates from a single power supply, 2.5V to 3.6V or 2.7V to 3.6V, for both the program and read operations. The AT45DB081B 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. When the device is shipped from Atmel, the most significant page of the memory array may not be erased. In other words, the contents of the last page may not be filled with FFH. Block Diagram Memory Array To provide optimal flexibility, the memory array of the AT45DB081B is divided into three levels of granularity comprising 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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