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Description

The AT45D021 is a 5-volt only, serial interface Flash memory suitable for in-system reprogramming. Its 2,162,688 bits of memory are organized as 1024 pages of 264- bytes each. In addition to the main memory, the AT45D021 also contains two data SRAM buffers of 264-bytes each. The buffers allow receiving of data while a page in the main memory is being reprogrammed. Unlike conventional Flash memories that are accessed randomly with multiple address lines and a parallel interface, the DataFlash uses a serial interface to sequentially access its data.

Features

? Single 4.5V - 5.5V Supply

? Serial Interface Architecture

? Page Program Operation

– Single Cycle Reprogram (Erase and Program)

– 1024 Pages (264 Bytes/Page) Main Memory

? Two 264-Byte SRAM Data Buffers – Allows Receiving of Data while Reprogramming of Nonvolatile Memory

? Internal Program and Control Timer

? Fast Page Program Time – 7 ms Typical

? 80 μs Typical Page to Buffer Transfer Time

? Low Power Dissipation

– 15 mA Active Read Current Typical

– 15 μA CMOS Standby Current Typical

? 10 MHz Max Clock Frequency

? Hardware Data Protection Feature

? Serial Peripheral Interface (SPI) Compatible – Modes 0 and 3

? CMOS and TTL Compatible Inputs and Outputs

? Commercial and Industrial Temperature Ranges