AT45D021

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 while Reprogramming of Nonvolatile Memory
• Internal Program and Control Timer
• Fast Page Program Time 7 ms Typical
• 80 ms Typical Page to Buffer Transfer Time
• Low Power Dissipation
  15 mA Active Read Current Typical
  15 mA CMOS Standby Current Typical
• 10 MHz Max Clock Frequency
• Hardware Data Protection Feature
• Serial Peripheral Interface (SPI) Compatible Modes 0
• CMOS and TTL Compatible Inputs and Outputs
• Commercial and Industrial Temperature Ranges


Pinout




Specifications

Temperature under Bias ................. -55°C to +125°C Storage Temperature ..................... -65°C to +150°C All Input Voltages (including NC Pins) with Respect to Ground .......................-0.6V to +6.25V All Output Voltages with Respect to Ground ..................-0.6V to VCC + 0.6V

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. The simple serial interface facilitates hardware layout, increases system reliability, minimizes switching noise, and reduces package size and active pin count. AT45D021 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. AT45D021 operates at clock frequencies up to 10 MHz with a typical active read current consumption of 15 mA.

To allow for simple in-system reprogrammability, the AT45D021 does not require high input voltages for programming. The device operates from a single power supply, 4.5V to 5.5V, for both the program and read operations. The AT45D021 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 of AT45D021 are self-timed, and no separate erase cycle is required before programming.