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Microchip Technology AT29BV040A-25TI
- Part No.:
- AT29BV040A-25TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29BV040A-25TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,328
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Product details
Overview
AT29BV040A-25TI from Atmel is a 4-Mbit (512K × 8) single-supply 2.7V–3.6V Flash memory IC used for nonvolatile code and data storage in embedded systems. It features 200 ns read access time, 20 ms max sector program cycle, 10,000 write/erase endurance per sector, and dual 16K-byte boot blocks with independent programming lockout - deployed in industrial microcontroller boot loaders and firmware update modules.
For engineers reviewing the AT29BV040A-25TI datasheet, AT29BV040A-25TI pinout, AT29BV040A-25TI application, or AT29BV040A-25TI equivalent, this page delivers verified electrical specs, TSOP-32 pin mapping, boot-block protection behavior, sector-program timing constraints, and real-world use cases in industrial control and automotive ECU firmware storage.
Technical Context
The AT29BV040A-25TI operates as a parallel-interface Flash memory with CMOS/TTL-compatible I/Os and software-controlled sector erase/write. Its architecture supports byte-load programming via three-step unlock sequence (5555H/2AAAH/5555H), automatic internal sector erase before programming, and DATA polling on I/O7 or toggle-bit detection on I/O6 to signal program completion.
Hardware protection includes VCC sense (<1.8V inhibit), 10 ms power-on delay, OE/CE/WE state-based program inhibition, and 15 ns noise filtering on control inputs. Boot block lockout is enabled by a seven-command algorithm and disables chip erase when activated - critical for secure bootloader integrity in safety-critical applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling full firmware image storage for mid-complexity MCUs |
| Supply Voltage | 2.7V–3.6V single supply - eliminates need for charge pumps or dual-rail regulators |
| Read Access Time | 250 ns max (tACC), compatible with 4 MHz bus timing without wait states |
| Sector Size & Count | 2048 sectors × 256 bytes each - enables granular firmware updates without full-chip erase |
| Endurance | ≥10,000 program/erase cycles per sector - supports field firmware upgrades over product lifetime |
| Standby Current | 50 µA max (industrial temp), reducing system power budget in always-on monitoring nodes |
| Operating Temp | -40°C to +85°C - qualified for industrial automation and under-hood automotive environments |
Pinout & Package
AT29BV040A-25TI uses a 32-lead Thin Small Outline Package (TSOP Type I, 8 × 20 mm), JEDEC MO-142 BD compliant, with 0.5 mm lead pitch and 1.0 mm nominal body height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A7 select byte within 256-byte sector |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high forces outputs to high-Z |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low write strobe; controls latching of address/data during byte load and program initiation |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for toggle-bit status monitoring |
| VCC | Power Supply | 2.7V–3.6V core supply; internal VCC sense prevents programming below 1.8V |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal logic |
| NC | No Connect | Pin 13 (A9) is NC in standard operation; voltage tolerance up to +13.5V supports hardware ID mode |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-command unlock sequence (5555H/2AAAH/5555H) prevents accidental writes - essential for field-upgrade reliability |
| Dual Boot Block Lockout | Independent 16K-byte lower/higher address blocks can be permanently write-locked - secures bootloader code against corruption |
| Sector-Based Programming | 256-byte sector granularity allows partial firmware updates without erasing entire memory - reduces downtime in maintenance scenarios |
| DATA Polling & Toggle Bit | Real-time program status via I/O7 complement or I/O6 toggling - eliminates need for fixed delays or external timers |
| CMOS/TTL Compatibility | Inputs accept 0–5.5V; outputs drive standard TTL loads - simplifies interface with legacy 5V microcontrollers |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing fast read access for MCU instruction fetch and reliable sector-erase capability for field firmware updates. Use Value: 50 µA standby current extends battery backup runtime; -40°C to +85°C rating ensures operation in unconditioned control cabinets; boot block lockout prevents accidental overwrite of critical startup code. |
Use Scenario: Hosting boot code and calibration data in engine control units where firmware integrity and in-system reprogrammability are mandated by OEM requirements. IC Role / Device Role / Timing Role: Secure, lockable Flash memory used during power-on initialization to load bootloader before transferring control to main application firmware. Use Value: Dual 16K boot blocks allow redundant boot images; software lockout prevents unauthorized modification; 250 ns read access meets tight timing budgets for cold-start sequences. |
| Medical Device Configuration Storage | Network Router Boot Image Storage |
Use Scenario: Retaining device-specific calibration coefficients, user preferences, and regulatory compliance settings in portable diagnostic equipment requiring long-term data retention. IC Role / Device Role / Timing Role: Low-power, high-endurance Flash memory storing persistent configuration data accessed infrequently but requiring guaranteed retention over 10+ years. Use Value: 10,000-cycle endurance supports repeated recalibration; 40–50 µA standby current minimizes battery drain in battery-powered devices; software protection prevents misconfiguration during service. |
Use Scenario: Holding compressed boot images and recovery firmware in enterprise-grade network switches and routers that perform remote firmware upgrades without service interruption. IC Role / Device Role / Timing Role: Parallel Flash memory mapped into CPU address space to enable direct execution of boot code and rapid decompression of primary firmware images. Use Value: 20 ms sector program time enables fast incremental updates; TSOP-32 package supports high-density PCB layouts; compatibility with 3.3V and 5V buses eases integration across generations of SoC platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns access, 3.0–3.6V supply, 100,000 endurance cycles, no boot block lockout | Lacks dedicated boot block protection; higher speed but lower endurance margin for frequent updates | Preferred when faster read performance is critical and boot security is handled externally |
| MX29LV400CTTI-70G | 4 Mbit, 70 ns access, 2.7–3.6V supply, 100,000 cycles, top/bottom boot block with lockout | Same boot block functionality but requires different unlock sequence; pinout differs in A16/A17 placement | Drop-in replacement only after layout verification; suitable for new designs prioritizing higher endurance |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT29BV040A-25TI trades raw speed for proven industrial temperature stability, deterministic 20 ms sector programming, and Atmel's mature software lockout implementation - making it optimal for cost-sensitive, long-lifecycle industrial firmware storage where reliability outweighs peak bandwidth.
Availability
AT29BV040A-25TI is available at Aetrix Electronics and suitable for industrial control systems, automotive ECU firmware storage, and medical device configuration retention requiring stable component supply across extended production lifecycles.
Supply support for AT29BV040A-25TI 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
Atmel Corporation, now part of Microchip Technology, is a fabless semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs.
The AT29BV040A-25TI belongs to Atmel's Battery-Voltage™ Flash memory family, designed specifically for single-supply, low-voltage embedded systems requiring robust in-system reprogrammability and industrial-grade reliability.
FAQ
What is the maximum read access time specified for the AT29BV040A-25TI?
The AT29BV040A-25TI has a maximum read access time (tACC) of 250 ns under industrial temperature conditions (-40°C to +85°C) and 3.6V supply. This value is confirmed in the AC Read Characteristics table of the official datasheet (Rev. 0383G–FLASH–5/03) and applies to both CE- and OE-controlled read operations. The "25" in the part number directly denotes this 250 ns timing grade.
Does the AT29BV040A-25TI support hardware reset or power-on initialization sequencing?
The AT29BV040A-25TI does not include an internal hardware reset circuit. However, the datasheet specifies a mandatory 20 ms delay after VCC reaches its minimum valid level (2.7V) before initiating any operational mode. This requirement ensures internal voltage regulators and latches stabilize - a design constraint that must be enforced by the host system's power management controller or firmware initialization routine for reliable AT29BV040A-25TI operation.
How is boot block lockout enabled on the AT29BV040A-25TI, and what happens once activated?
Boot block lockout on the AT29BV040A-25TI is enabled via a seven-command software algorithm targeting addresses 00000H (lower block) or 7FFFFH (upper block). Once activated, the corresponding 16K-byte block becomes permanently write-protected: no erase or program commands will affect it. Critically, chip erase is disabled if either block is locked - a safeguard ensuring bootloader integrity. This behavior is documented in the Boot Block Lockout Feature Enable Algorithm section of the AT29BV040A-25TI datasheet.
Can the AT29BV040A-25TI be interfaced directly with a 5V microcontroller bus?
Yes - the AT29BV040A-25TI accepts input voltages up to 5.5V on address and control pins (A0–A18, CE, OE, WE) while operating from a 2.7V–3.6V VCC supply. Its outputs are CMOS/TTL-compatible and drive to VOH ≥ 2.4V (at IOH = -100 µA, VCC = 3.0V), ensuring reliable logic-high recognition by 5V receivers. However, I/O lines must not exceed VCC + 0.6V, so direct connection to 5V buses requires level-shifting for data lines unless the host uses open-drain or clamped I/O.
What methods does the AT29BV040A-25TI provide to detect program completion?
The AT29BV040A-25TI provides two hardware-confirmed methods: DATA polling on I/O7 (complement of last loaded byte indicates active programming; true data signals completion) and toggle-bit detection on I/O6 (bit toggles during programming and stops when complete). Both methods are characterized in the datasheet and require no external components - enabling deterministic, timer-free program flow control in the host MCU firmware for AT29BV040A-25TI.
AT29BV040A-25TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20ms
- Access Time:
- 250 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT29BV040A-25TI FAQ
1.How can I place an order for AT29BV040A-25TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29BV040A-25TI 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 AT29BV040A-25TI reliable?
The price and inventory of AT29BV040A-25TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29BV040A-25TI is usually 5 days.
3.What payment methods are accepted for AT29BV040A-25TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29BV040A-25TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29BV040A-25TI?
AT29BV040A-25TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29BV040A-25TI 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 AT29BV040A-25TI?
For technical support, including AT29BV040A-25TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29BV040A-25TI requirements.
6.How does Aetrix verify that AT29BV040A-25TI is sourced from the original manufacturer or authorized distributors?
All AT29BV040A-25TI 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 AT29BV040A-25TI meets industry standards.
7.What is the process for return or replacement of AT29BV040A-25TI?
All AT29BV040A-25TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29BV040A-25TI, 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 AT29BV040A-25TI part is unused and in its original packaging.
Return procedure for AT29BV040A-25TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29BV040A-25TI Tags
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AT24C02C-XHM-T
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