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Microchip Technology AT29BV040A-20TI
- Part No.:
- AT29BV040A-20TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29BV040A-20TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,654
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Product details
Overview
AT29BV040A-20TI from Atmel is a 4-megabit (512K × 8) single-supply 2.7V–3.6V Flash memory IC organized as 524,288 words by 8 bits, featuring 200 ns read access time, 15 mA active current, 40 µA CMOS standby current, and sector-based reprogrammability for embedded firmware storage in industrial control systems.
For engineers reviewing the AT29BV040A-20TI datasheet, AT29BV040A-20TI pinout, AT29BV040A-20TI application, or AT29BV040A-20TI equivalent, this page delivers verified electrical specs, TSOP-32 pin mapping, boot-block lockout behavior, software data protection sequence, and real-world use cases in programmable logic controllers and automotive ECUs requiring in-system reprogrammability without high-voltage programming.
Technical Context
The AT29BV040A-20TI implements sector-erase Flash architecture with 2048 × 256-byte sectors and two independent 16K-byte boot blocks that support hardware-locked programming via 7-command enable algorithm. It uses standard parallel bus interface with CE/OE/WE control and supports both DATA polling (I/O7 complement detection) and TOGGLE bit (I/O6 toggling) for program cycle completion signaling.
Its software data protection requires a three-byte command sequence (AAh→55h→A0h at addresses 5555h/2AAAh/5555h) before any sector load, and all sector programming must complete within 20 ms max tWC while maintaining 150 µs inter-byte timing (tBLC) during 256-byte loading - no external erase command needed due to automatic pre-program erase.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), enabling full firmware image storage for mid-complexity microcontrollers |
| Read Access Time | 200 ns (tACC), compatible with 5 MHz bus timing without wait states |
| Supply Voltage | 2.7V–3.6V single supply, eliminating need for separate VPP programming voltage |
| Active Current | 15 mA at 5 MHz / 3.6V, supporting low-power operation in battery-backed systems |
| Standby Current | 40 µA (CMOS), meeting industrial temperature range (-40°C to +85°C) leakage requirements |
| Sector Size | 256 bytes per sector, allowing fine-grained firmware updates without full chip erase |
| Endurance | 10,000 write/erase cycles per sector, sufficient for field firmware upgrades over product lifetime |
Pinout & Package
AT29BV040A-20TI is housed in a 32-lead Thin Small Outline Package (TSOP Type I), 8 mm × 20 mm footprint, JEDEC MO-142 BD compliant, with 0.5 mm pitch and 0.6 mm nominal lead thickness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 524,288-word addressing; A8–A18 select sector, A0–A7 select byte within sector |
| CE | Chip Enable | Active-low chip select; when high, device enters high-impedance standby mode with 40 µA current draw |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during read operations |
| WE | Write Enable | Active-low write strobe; controls byte loading during sector programming and triggers internal erase+program sequence |
| I/O0–I/O7 | Data Bus | Bidirectional 8-bit data path; I/O7 provides DATA polling status, I/O6 provides TOGGLE bit status during programming |
| VCC | Power Supply | 2.7V–3.6V main supply; includes VCC sense circuitry that inhibits programming if below 1.8V |
| GND | Ground | Reference for all inputs/outputs; noise filter rejects pulses <15 ns on WE/CE to prevent spurious writes |
| NC | No Connect | Pin 13 (A11) is NC in TSOP package; must be left unconnected per datasheet pin configuration diagram |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) required before every sector program, preventing accidental writes during power transitions or noise events |
| Boot Block Lockout | Two independent 16K-byte blocks (first/last 16K) can be permanently locked via 7-command enable algorithm, securing bootloader code from overwrite |
| Internal Program Control | On-chip timer and state machine handle full sector erase + program automatically after byte load completes - no external timing logic needed |
| DATA Polling & TOGGLE Bit | Dual end-of-program detection: I/O7 returns complement until completion; I/O6 toggles during operation - enables polling without dedicated status register |
| Hardware Write Inhibit | VCC sense, 10 ms power-on delay, OE/CE/WE level monitoring, and 15 ns noise filtering collectively eliminate need for external write-protection circuitry |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Boot Code Retention |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in factory environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing direct CPU bus interface for XIP (execute-in-place) or copy-to-RAM boot sequences. Use Value: 200 ns read access enables zero-wait-state execution; sector locking protects critical startup routines; 40 µA standby current extends backup battery life during power loss. | Use Scenario: Holding calibrated sensor maps and bootloader code in engine control units deployed in under-hood automotive applications (-40°C to +85°C). IC Role / Device Role / Timing Role: In-system reprogrammable Flash memory with dual boot blocks, allowing safe field updates without corrupting primary boot vector. Use Value: Boot block lockout prevents accidental overwrite of safety-critical startup code; 10,000-cycle endurance supports multiple calibration revisions over vehicle lifetime. |
| Medical Device Configuration Memory | Networking Equipment Image Backup |
Use Scenario: Storing device-specific calibration parameters and regulatory compliance settings in portable diagnostic equipment requiring traceable firmware versions. IC Role / Device Role / Timing Role: Secure, sector-erasable nonvolatile memory with software-protected programming to prevent unauthorized parameter changes. Use Value: Software data protection ensures only authenticated host MCU can initiate writes; 256-byte sector granularity allows selective update of individual calibration tables. | Use Scenario: Maintaining redundant firmware images in enterprise switches and routers for fail-safe recovery after corrupted main image. IC Role / Device Role / Timing Role: Parallel-interface Flash memory acting as secondary boot source, accessed via dedicated address decode logic during recovery mode. Use Value: Fast 20 ms sector program time enables rapid image restoration; TSOP-32 package supports high-density PCB layouts in space-constrained telecom modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF040-20-4C-NHE | 4 Mbit, 200 ns, 3.0V–3.6V supply, same TSOP-32 package, but uses different software unlock sequence (5555h/2AAAh/5555h → 5555h/2AAAh/A0h) | Requires modified driver code for unlock and sector erase; lacks boot block lockout feature | Select when existing SST39VF firmware infrastructure is in place and boot protection is not required |
| MX29LV040CTTI-20G | 4 Mbit, 200 ns, 3.0V–3.6V, TSOP-32, supports CFI query mode and uniform 64K-byte sectors instead of 256-byte sectors | Does not support byte-load sector programming; requires full 64K erase for any update; no boot block lockout | Choose for systems needing CFI-compliant tools or where larger sector size simplifies memory management |
Compared with AT29BV040A-20TI, SST39VF040-20-4C-NHE offers identical timing and voltage but omits boot block security, while MX29LV040CTTI-20G trades fine-grained 256-byte sectors for CFI compatibility and larger erase blocks - making AT29BV040A-20TI optimal for applications demanding secure, incremental firmware patching.
Availability
AT29BV040A-20TI is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT29BV040A-20TI 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 semiconductor company specializing in microcontrollers, Flash memory, and secure authentication devices for embedded systems.
The AT29BV040A-20TI belongs to Atmel's Battery-Voltage™ Flash memory family, designed specifically for single-supply in-system reprogrammability in resource-constrained industrial and automotive applications without external high-voltage circuitry.
FAQ
What is the maximum sector program cycle time for AT29BV040A-20TI?
The AT29BV040A-20TI has a maximum sector program cycle time (tWC) of 20 ms. This includes both automatic sector erase and programming of all 256 bytes loaded into the sector. The internal timer ensures consistent timing regardless of VCC or temperature variation across the industrial range (-40°C to +85°C), and the AT29BV040A-20TI does not require external timing components to meet this specification.
How does the boot block lockout feature work on AT29BV040A-20TI?
The AT29BV040A-20TI contains two 16K-byte boot blocks - one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Each can be independently locked using a 7-command software sequence. Once enabled, the AT29BV040A-20TI prevents any erase or program operation to that block, and chip erase is disabled if either block is locked. Status is readable via software identification mode at addresses 00002H (lower) and 7FFF2H (upper).
Can AT29BV040A-20TI operate with 5V-tolerant inputs?
Yes - the AT29BV040A-20TI supports 0–5.5V input levels on address and control pins (A0–A18, CE, OE, WE) while powered from 2.7V–3.6V, enabling direct interfacing with 5V microcontrollers without level shifters. However, I/O0–I/O7 pins are limited to 0–(VCC + 0.6V), so they are not 5V-tolerant and must be driven within the supply rail.
What happens if the software data protection sequence is not completed before writing to AT29BV040A-20TI?
If the three-byte unlock sequence (AAh→55h→A0h at 5555h/2AAAh/5555h) is incomplete, the AT29BV040A-20TI will ignore subsequent write attempts. During tWC (20 ms), reads from the target address return polling data instead of valid memory contents, but no actual programming occurs. Power cycling does not reset the protection state - the full sequence must be re-entered to enable writes to the AT29BV040A-20TI.
Is AT29BV040A-20TI pin-compatible with other 4 Mbit Flash memories in TSOP-32 packages?
The AT29BV040A-20TI follows standard parallel Flash pinout (A0–A18, CE/OE/WE, I/O0–I/O7, VCC/GND), making it mechanically compatible with most 4 Mbit TSOP-32 Flash devices. However, functional compatibility requires matching command sets and timing - for example, SST39VF040 uses the same unlock sequence but differs in sector erase behavior, while MX29LV040 uses CFI commands. Direct replacement requires validation of software drivers and timing margins for the AT29BV040A-20TI.
AT29BV040A-20TI 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:
- 200 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-20TI FAQ
1.How can I place an order for AT29BV040A-20TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29BV040A-20TI 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-20TI reliable?
The price and inventory of AT29BV040A-20TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29BV040A-20TI is usually 5 days.
3.What payment methods are accepted for AT29BV040A-20TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29BV040A-20TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29BV040A-20TI?
AT29BV040A-20TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29BV040A-20TI 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-20TI?
For technical support, including AT29BV040A-20TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29BV040A-20TI requirements.
6.How does Aetrix verify that AT29BV040A-20TI is sourced from the original manufacturer or authorized distributors?
All AT29BV040A-20TI 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-20TI meets industry standards.
7.What is the process for return or replacement of AT29BV040A-20TI?
All AT29BV040A-20TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29BV040A-20TI, 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-20TI part is unused and in its original packaging.
Return procedure for AT29BV040A-20TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29BV040A-20TI Tags
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