Microchip Technology AT45DB081B-CC

Overview

AT45DB081B-CC from Microchip Technology (formerly Atmel) is an 8-Mbit serial DataFlash memory IC optimized for embedded code shadowing, firmware storage, and data logging in resource-constrained systems. It features 4096 pages × 264 bytes (8,650,752 bits), dual 264-byte SRAM buffers, SPI interface (modes 0/3), 20 MHz max clock, and 2.5V–3.6V or 2.7V–3.6V single-supply operation.

For engineers reviewing the AT45DB081B-CC datasheet, AT45DB081B-CC pinout, AT45DB081B-CC application, or AT45DB081B-CC equivalent, key selection considerations include its continuous array read capability for boot code streaming, hardware write protection (WP), RDY/BUSY signaling, 5.0V-tolerant control pins, and page/block erase flexibility in industrial temperature range designs.

Technical Context

The AT45DB081B-CC implements a dedicated SPI-based Flash architecture with two independent 264-byte SRAM buffers enabling concurrent data reception and nonvolatile memory reprogramming. Its memory array is organized into 4096 pages (264 B/page), grouped into 512 blocks of 8 pages each, supporting page-level (tPE ≤ 20 ms) and block-level (tBE ≤ 40 ms) erase operations.

It supports SPI Mode 0 and Mode 3 with MSB-first data transfer, self-timed internal programming (tEP ≤ 20 ms), and status register polling via RDY/BUSY bit (bit 7) and compare result flag (bit 6). All instructions are initiated by CS low, followed by 8-bit opcode and address/don't-care sequences per Table 4.

Key Specifications

Pinout & Package

AT45DB081B-CC is packaged in a 28-pin TSOP-I (Type 1) with 0.55 mm pitch, compliant with JEDEC MO-153. Pin functions are electrically defined and validated per Atmel Rev. 2225F datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial Flash memory applications.

Compared with AT45DB081B-CC, AT45DB081D-CU offers identical functionality in a different package, while W25Q80DVSSIG trades buffer-enabled concurrency for higher program throughput and industry-standard command compatibility - making it better suited for legacy SPI Flash firmware upgrades but unsuitable for real-time streaming or EEPROM emulation use cases.

Availability

AT45DB081B-CC is available at Aetrix Electronics and suitable for firmware storage, code shadowing, data logging, and calibration storage applications requiring stable component supply across extended product lifecycles.

Supply support for AT45DB081B-CC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology acquired Atmel in 2016 and maintains full support for the legacy DataFlash product family, including long-term manufacturing, documentation, and technical resources.

The AT45DB081B-CC belongs to the DataFlash® series designed specifically for SPI-based embedded systems needing high-density serial memory with integrated buffering and EEPROM-like flexibility - targeting cost-sensitive, low-power, and space-constrained applications.

FAQ

What is the maximum clock frequency supported by the AT45DB081B-CC?

The AT45DB081B-CC supports a maximum serial clock (SCK) frequency of 20 MHz for all read, write, and command operations. This specification is guaranteed across the full industrial temperature range (–40°C to +85°C) and 2.5V–3.6V supply voltage. At 20 MHz, the device achieves optimal throughput for continuous array reads, delivering up to ~2.5 MB/s effective data rate when streaming across page boundaries without interruption. The AT45DB081B-CC must be operated within this limit to ensure reliable command execution and data integrity.

Does the AT45DB081B-CC require high-voltage programming signals?

No, the AT45DB081B-CC does not require high-voltage programming signals. It operates entirely from a single 2.5V–3.6V or 2.7V–3.6V supply for both read and program/erase operations. All internal programming voltages are generated on-chip, eliminating the need for external VPP pins or charge pumps. This simplifies power design and enables direct connection to standard 2.5V or 3.3V microcontroller I/Os. The AT45DB081B-CC's self-timed programming ensures consistent tEP ≤ 20 ms regardless of supply voltage within spec, making it ideal for battery-powered and low-noise embedded systems.

How does the dual-buffer architecture of the AT45DB081B-CC improve system performance?

The AT45DB081B-CC integrates two independent 264-byte SRAM buffers that operate concurrently with main memory programming. While one buffer receives new data via SI, the other can be written to Flash - eliminating I/O stalls and enabling true pipelined operation. This architecture allows continuous data streaming into the device without host CPU intervention between pages. For example, during firmware updates, the host can fill Buffer 2 while Buffer 1 is being programmed into Flash, reducing total update time by up to 40% versus single-buffer alternatives. This capability is intrinsic to the AT45DB081B-CC's design and requires no additional external components.

Can the AT45DB081B-CC be used as a drop-in replacement for AT45DB081A?

Yes, the AT45DB081B-CC is 100% compatible with AT45DB081 and AT45DB081A per the official datasheet, sharing identical pinout, command set, timing parameters, and electrical specifications. No PCB or firmware changes are required when upgrading from AT45DB081A to AT45DB081B-CC. The revision improves reliability and adds minor errata fixes but maintains full functional and mechanical equivalence. This backward compatibility is explicitly documented in the "Features" section of the AT45DB081B datasheet, confirming that the AT45DB081B-CC may be substituted without redesign in existing AT45DB081A-based systems.

What is the purpose of the RDY/BUSY pin on the AT45DB081B-CC?

RDY/BUSY is an open-drain output pin on the AT45DB081B-CC that signals active internal operations: page/block erase, buffer-to-Flash programming, page-to-buffer transfer, or auto page rewrite. It is driven low during these self-timed processes and returns high upon completion. A 1 kΩ external pull-up resistor is required. Unlike polling the status register, RDY/BUSY provides hardware-level readiness detection, allowing the host microcontroller to enter low-power sleep mode or service other peripherals while waiting. This pin is functionally identical across all DataFlash generations and is essential for deterministic timing in real-time AT45DB081B-CC applications.