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Microchip Technology AT45DB081B-CI
- Part No.:
- AT45DB081B-CI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 14-LBGA, CSPBGA
- Datasheet:
-
AT45DB081B-CI.pdf
- Description:
- IC FLASH 8MBIT SPI 20MHZ 14CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,043
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Product details
Overview
AT45DB081B-CI from Microchip Technology (formerly Atmel) is an 8-Mbit serial DataFlash memory IC with SPI interface, organized as 4096 pages × 264 bytes, featuring dual 264-byte SRAM buffers for concurrent read-while-write operation, 20 MHz max clock, and hardware write protection - ideal for code shadowing and firmware storage in embedded microcontrollers.
For engineers reviewing the AT45DB081B-CI datasheet, AT45DB081B-CI pinout, AT45DB081B-CI application, or AT45DB081B-CI equivalent, key selection criteria include SPI mode 0/3 compatibility, 2.5V–3.6V single-supply operation, page/block erase granularity, RDY/BUSY status signaling, and 5.0V-tolerant control pins for mixed-voltage system interfacing.
Technical Context
The AT45DB081B-CI implements a serial Flash architecture with two independent 264-byte SRAM buffers enabling simultaneous data reception into one buffer while reprogramming the main memory array from the other. Its command set supports page-level, block-level (8-page), and continuous array read operations without address retransmission.
It uses SPI Mode 0 and Mode 3 with MSB-first data transfer, self-timed internal erase-and-program cycles (no external high-voltage programming required), and status register polling via RDY/BUSY bit (bit 7) to manage timing-critical host interactions - all operating within a single 2.5V–3.6V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8,650,752 bits (4096 × 264-byte pages) |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V - single-rail operation eliminates level-shifting needs |
| Max Clock Frequency | 20 MHz - enables up to ~2.5 MB/s sequential read throughput |
| Active Read Current | 4 mA typical - low power consumption during firmware execution |
| Standby Current | 2 µA typical - suitable for battery-backed or always-on storage |
| Write Protection | Hardware WP pin protects first 256 pages - prevents accidental bootloader corruption |
| Input Tolerance | 5.0V-tolerant SI, SCK, CS, RESET, WP - simplifies interface with 5V microcontrollers |
Pinout & Package
AT45DB081B-CI is supplied in a 28-pin SOIC package (300 mil width), with pin 1 marked by notch or dot. Pin functions are defined per JEDEC MS-012 standard and support direct drop-in replacement for legacy AT45DB081/AT45DB081A designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command initiation; must remain low during full instruction sequence |
| SCK | Serial Clock | Input-only clock; data latched on rising edge, output shifted on falling edge (SPI Mode 0/3) |
| SI | Serial Input | Input-only data line for opcodes, addresses, and buffer writes; MSB-first protocol |
| SO | Serial Output | Output-only data line for reads and status register; tri-stated when CS high |
| WP | Write Protect | Active-low hardware lock for first 256 pages; 5.0V-tolerant for mixed-voltage systems |
| RESET | Chip Reset | Active-low asynchronous reset; terminates ongoing operation and returns state machine to idle |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled high externally; driven low during erase/program/transfer operations |
| VCC / GND | Power Supply | Single 2.5V–3.6V rail; decoupling capacitor required per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 264-byte buffers enable true concurrent read-while-write - critical for streaming firmware updates without CPU stalls |
| Continuous Array Read | Single-start opcode (68H/E8H) + address initiates uninterrupted sequential read across page boundaries - ideal for XIP code shadowing |
| Self-Timed Programming | No external high-voltage programming required; built-in erase+program cycle completes autonomously in ≤20 ms (tEP) |
| Flexible Erase Granularity | Supports page-erase (264 B), block-erase (2112 B), and sector-level management - optimizes endurance and wear leveling |
| Hardware Data Protection | WP pin + RESET pin + status register bit 7 provide layered reliability against unintended writes or power-loss corruption |
Applications
| Firmware Storage | Bootloader Code Shadowing |
|---|---|
Use Scenario: Storing application firmware images for microcontrollers with limited internal Flash. IC Role / Device Role / Timing Role: Nonvolatile storage device providing SPI-accessible program code to MCU on power-up or OTA update. Use Value: Enables field-upgradable firmware without requiring external parallel Flash or EEPROM; 20 MHz interface supports fast boot times. | Use Scenario: Copying boot code from serial Flash to RAM before execution on resource-constrained MCUs. IC Role / Device Role / Timing Role: High-speed sequential data source supporting continuous array read mode for zero-wait-state shadowing. Use Value: Eliminates need for large internal SRAM; 264-byte page alignment and wraparound addressing simplify loader implementation. |
| Data Logging Buffer | Configuration & Calibration Storage |
Use Scenario: Capturing sensor readings in industrial controllers where power loss may occur mid-write. IC Role / Device Role / Timing Role: Dual-buffer architecture allows incoming data to be written to one buffer while previous batch is committed to Flash. Use Value: Guarantees atomic page writes and prevents partial-record corruption; WP pin safeguards critical configuration sectors. | Use Scenario: Storing device-specific calibration coefficients, MAC addresses, or user settings in medical or test equipment. IC Role / Device Role / Timing Role: Byte-alterable EEPROM emulation via Read-Modify-Write using internal buffers - no external logic needed. Use Value: Provides reliable, low-pin-count nonvolatile storage with 100,000+ erase/write cycles per page and hardware write lock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB081E-CI | Same density and pinout; enhanced ESD rating (4 kV HBM) and extended temperature range (−40°C to +85°C) | Required for industrial environments with higher noise or thermal stress | Select AT45DB081E-CI when operating beyond commercial temperature limits or requiring improved robustness |
| W25Q80DVSSIG | 8-Mbit SPI NOR Flash; quad I/O capable; faster erase times but lacks dual buffers and continuous read mode | Preferred for high-speed execute-in-place (XIP) where random access latency matters more than streaming | Choose W25Q80DVSSIG only if system requires faster sector erase or quad-SPI bandwidth; not drop-in compatible for buffer-dependent workflows |
Compared with AT45DB081E-CI, the AT45DB081B-CI offers identical functionality at lower cost for commercial-grade applications, while W25Q80DVSSIG trades buffer concurrency and seamless streaming for higher random-access performance and broader industry adoption - making it less suitable for legacy DataFlash-based code shadowing designs.
Availability
AT45DB081B-CI is available at Aetrix Electronics and suitable for firmware storage, bootloader shadowing, data logging, and configuration retention requiring stable component supply and long-term obsolescence planning.
Supply support for AT45DB081B-CI 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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with strong heritage in Atmel's DataFlash product line.
The AT45DB081B-CI belongs to Microchip's legacy DataFlash family, designed specifically for embedded systems needing efficient SPI-based code and data storage with concurrent buffer operation - targeting cost-sensitive, space-constrained applications where simplicity and reliability outweigh raw speed.
FAQ
What voltage range does the AT45DB081B-CI support?
The AT45DB081B-CI operates from a single supply of 2.5V–3.6V or 2.7V–3.6V. It does not support 5V operation, but its SI, SCK, CS, RESET, and WP pins are 5.0V-tolerant, allowing safe interfacing with 5V microcontrollers without level shifters. This dual-voltage capability simplifies design in mixed-signal systems while maintaining low-power operation.
Does the AT45DB081B-CI support true read-while-write functionality?
Yes, the AT45DB081B-CI supports true concurrent operation via its two independent 264-byte SRAM buffers. While one buffer is being written to via SI, the other can be used to program a page into main memory - or vice versa - enabling uninterrupted data streaming. This is confirmed in the datasheet under "Two 264-byte SRAM Data Buffers" and "Main Memory Page Program through Buffer" command.
How does the AT45DB081B-CI handle page boundary crossing during continuous read?
During Continuous Array Read (opcode 68H/E8H), the AT45DB081B-CI automatically increments its internal address counter across page boundaries with no delay or gap. When the end of a 264-byte page is reached, reading continues seamlessly at the start of the next page. Upon reaching the last bit of the 4096-page array, it wraps back to the first page - all without host intervention or timing penalty.
What is the purpose of the RDY/BUSY pin on the AT45DB081B-CI?
The RDY/BUSY pin on the AT45DB081B-CI is an open-drain output that signals active internal operations. It is pulled low during erase, program, page-to-buffer transfer, or compare operations - indicating the device is busy and cannot accept new commands. Host software must poll this pin (or bit 7 of the status register) before issuing subsequent instructions to avoid command collision or data corruption.
Is the AT45DB081B-CI pin-compatible with earlier versions like AT45DB081A?
Yes, the AT45DB081B-CI is 100% compatible with AT45DB081 and AT45DB081A per the datasheet. It maintains identical pinout, command set, timing parameters, and electrical characteristics - making it a direct drop-in replacement. No PCB or firmware changes are required when upgrading from AT45DB081A to AT45DB081B-CI in existing designs.
AT45DB081B-CI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-LBGA, CSPBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 8Mbit
- Memory Organization:
- 264 Bytes x 4096 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-CBGA (4.5x7)
AT45DB081B-CI FAQ
1.How can I place an order for AT45DB081B-CI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB081B-CI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT45DB081B-CI reliable?
The price and inventory of AT45DB081B-CI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB081B-CI is usually 5 days.
3.What payment methods are accepted for AT45DB081B-CI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB081B-CI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB081B-CI?
AT45DB081B-CI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB081B-CI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT45DB081B-CI?
For technical support, including AT45DB081B-CI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB081B-CI requirements.
6.How does Aetrix verify that AT45DB081B-CI is sourced from the original manufacturer or authorized distributors?
All AT45DB081B-CI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT45DB081B-CI meets industry standards.
7.What is the process for return or replacement of AT45DB081B-CI?
All AT45DB081B-CI units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB081B-CI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT45DB081B-CI part is unused and in its original packaging.
Return procedure for AT45DB081B-CI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB081B-CI Tags
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