AT45DB021A データシートの表示（PDF） - Atmel Corporation

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AT45DB021A

2-megabit 2.7-volt Only Serial DataFlash®

Atmel Corporation 

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

WP

FLASH MEMORY ARRAY

PAGE (264 BYTES)

BUFFER 1 (264 BYTES)

BUFFER 2 (264 BYTES)

SCK

CS

RESET

VCC

GND

RDY/BUSY

I/O INTERFACE

SI

SO

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.

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AT45DB021A

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