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