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Microchip Technology AT49BV040-12VI
- Part No.:
- AT49BV040-12VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49BV040-12VI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,041
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Product details
Overview
AT49BV040-12VI from Atmel is a 4-megabit (512K × 8) single-voltage Flash memory IC operating at 2.7V–3.6V, featuring 120 ns read access time, 10-second chip erase, and 30 µs/byte programming. It integrates a 16 KB boot block with hardware lockout and supports in-system reprogramming without high-voltage inputs - used in embedded controllers for firmware storage and boot code retention.
For engineers reviewing the AT49BV040-12VI datasheet, AT49BV040-12VI pinout, AT49BV040-12VI application, or AT49BV040-12VI equivalent, key selection criteria include industrial temperature range (−40°C to +85°C), TSOP/PLCC package compatibility, boot-sector write protection, Data Polling/Toggle Bit program status detection, and 10,000-cycle endurance.
Technical Context
The AT49BV040-12VI implements a standard NOR Flash architecture with address/data multiplexing via 19 address lines (A0–A18) and 8 bidirectional I/O pins. Its internal command register executes six-byte software sequences for chip erase, byte programming, and boot block lockout - all using only VCC-level signals (no external high-voltage generator required).
Operation modes include standard EPROM-like read (CE/OE low, WE high), byte programming (CE low, WE low, OE high), and standby (CE high). Hardware data protection enforces VCC sense (<1.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibit logic (OE low, CE high, or WE high blocks writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits - directly replaces EPROMs in 8-bit microcontroller boot memory slots. |
| Read Access Time | 120 ns max - meets timing requirements for 8-MHz Z80, 68K, and early ARM7 systems with no wait states. |
| Supply Voltage | 2.7V–3.6V - enables direct connection to 3.3V logic rails without level shifters or regulators. |
| Chip Erase Time | 10 seconds typical - allows full firmware update within embedded bootloader timeout windows. |
| Byte Programming Time | 30 µs typical - supports real-time field updates of configuration parameters or calibration data. |
| Endurance | 10,000 program/erase cycles - sufficient for firmware patching over 5+ years in industrial gateways. |
| Standby Current | 50 µA CMOS - enables battery-backed operation in always-on IoT edge nodes. |
| Operating Temp | −40°C to +85°C - qualified for industrial motor drives, PLC I/O modules, and outdoor telecom equipment. |
Pinout & Package
AT49BV040-12VI is available in 32-lead TSOP (8 × 14 mm, package code 32V) and PLCC (32J) packages. The industrial-grade VI suffix denotes −40°C to +85°C operation and TSOP packaging per ordering information table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A15 used for main array, A16–A18 select boot block region (00000H–03FFFH). |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8051, PIC18, and AVR microcontrollers; supports Data Polling on I/O7 and Toggle Bit on I/O6. |
| CE | Chip Enable | Active-low chip select - must be stable before address setup; controls device activation and power state transitions. |
| OE | Output Enable | Active-low output control - used with CE to manage bus contention; high-Z when inactive to prevent signal conflicts. |
| WE | Write Enable | Active-low write strobe - latches address/data during programming; combined with CE/OE to define operation mode (read, program, standby). |
| VCC | Power Supply | 2.7V–3.6V input - powers core logic and charge pump; internal VCC sense disables programming if voltage drops below 1.8V. |
| GND | Ground Reference | Signal and power ground - decoupling capacitor required within 10 mm of VCC pin for stable erase/program operation. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16 KB (00000H–03FFFH) permanently protected after 6-byte unlock sequence - prevents accidental overwrite of bootloader code in field-deployed devices. |
| Data Polling | I/O7 returns complement of programmed byte until completion - enables polling-based firmware update without interrupt or timer overhead. |
| Toggle Bit Detection | I/O6 toggles during erase/program cycles - provides asynchronous status feedback compatible with any MCU GPIO pin. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibit collectively eliminate spurious writes from EMI, brown-out, or glitchy control signals. |
| Single-Voltage Operation | 2.7V–3.6V supply powers all functions - eliminates need for 12V programming voltage generators and associated PCB area/cost. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding startup routines and ladder logic interpreter - accessed at power-up with 120 ns read latency. Use Value: Industrial temperature rating (−40°C to +85°C) and 50 µA standby current ensure reliable operation during extended idle periods between machine cycles. | Use Scenario: Securing boot code and regulatory-compliant diagnostic routines in portable ultrasound and infusion pump controllers. IC Role / Device Role / Timing Role: Trusted boot memory with hardware-enforced 16 KB write lockout - prevents unauthorized modification of safety-critical initialization sequences. Use Value: Boot block lockout activated via documented 6-byte command sequence ensures tamper-resistant firmware integrity meeting IEC 62304 Class B requirements. |
| Telecom Remote Node Configuration | Automotive Body Control Module Update |
Use Scenario: Storing network parameter tables and protocol stacks in DSLAM line cards and fiber access terminals requiring remote firmware updates. IC Role / Device Role / Timing Role: Field-updatable configuration memory supporting byte-level writes - accessed via SPI-to-parallel bridge or dedicated 8-bit host interface. Use Value: 30 µs/byte programming and Data Polling enable efficient delta updates over constrained backhaul links without blocking system operation. | Use Scenario: Holding vehicle-specific calibration maps and CAN message routing tables in body control units subject to dealership reprogramming. IC Role / Device Role / Timing Role: In-system reprogrammable flash memory interfaced to Freescale S12 or Infineon XC2000 microcontrollers via standard address/data bus. Use Value: Single 3.3V supply and 10,000-cycle endurance support repeated dealer-level recalibration across vehicle lifetime without hardware replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF040-70-4C-NHE | 4 Mbit, 70 ns access, 3.0V–3.6V supply, same 32-pin TSOP package but lacks boot block lockout feature. | No hardware-protected boot sector - requires external MCU-level write protection logic for secure bootloader storage. | Select when faster read speed is critical and boot code integrity is managed in software. |
| MX29LV040CTTI-12G | 4 Mbit, 120 ns access, 2.7V–3.6V supply, identical boot block size and lockout mechanism but uses different command set (AMD-style vs Atmel). | Requires firmware adaptation for erase/lock commands; pinout matches but timing margins differ slightly on tWP and tDH. | Select when migrating legacy designs from AMD-compatible flash and board layout reuse is mandatory. |
Compared with SST39VF040-70-4C-NHE and MX29LV040CTTI-12G, the AT49BV040-12VI uniquely combines industrial temperature rating, hardware boot lockout, and Atmel's standardized 6-byte command protocol - reducing firmware validation effort in safety-critical embedded systems.
Availability
AT49BV040-12VI is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic equipment, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT49BV040-12VI 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, designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets.
The AT49BV/LV040 product line delivers single-supply Flash memory optimized for embedded boot code storage, offering hardware write protection, low-power operation, and industrial temperature resilience - targeting cost-sensitive yet reliability-demanding applications.
FAQ
What is the maximum operating temperature range for the AT49BV040-12VI?
The AT49BV040-12VI is rated for industrial operation from −40°C to +85°C. This specification is confirmed in the Ordering Information table on page 11 of the datasheet, where the "VI" suffix explicitly denotes the industrial temperature grade and 32V (TSOP) package. The device maintains full functionality-including 120 ns read access and 30 µs byte programming-across this entire range.
Does the AT49BV040-12VI require high-voltage programming signals?
No, the AT49BV040-12VI does not require high-voltage programming signals. As stated in the Description section, it operates with single 2.7V–3.6V supply for both read and write operations. Programming is controlled entirely by six-byte software command sequences applied to standard address/data pins - eliminating the need for external 12V generators or complex voltage switching circuitry.
How is the boot block protected from accidental writes on the AT49BV040-12VI?
The AT49BV040-12VI implements hardware boot block lockout via a 6-byte command sequence written to specific addresses (5555H, 2AAAH, then 5555H with data 40H). Once executed, the 16 KB region (00000H–03FFFH) becomes permanently write- and erase-protected. Status can be verified by reading I/O0 during software product identification mode - a high level indicates lockout is active.
What package types are available for the AT49BV040-12VI?
The AT49BV040-12VI is supplied exclusively in the 32-lead TSOP package measuring 8 × 14 mm (package code 32V), as specified in the Ordering Information table. While the AT49BV040 family also offers PLCC (32J) and wider TSOP (32T) variants, the "VI" suffix confirms TSOP-32V packaging and industrial temperature qualification - no other package options carry the VI designation.
Can the AT49BV040-12VI be used as a direct replacement for EPROMs like the 27C040?
Yes, the AT49BV040-12VI is functionally compatible with 27C040 EPROMs in 8-bit systems due to identical 512K × 8 organization, parallel address/data interface, and EPROM-like read operation (CE/OE low, WE high). However, it requires firmware adaptation for erase/program commands and lacks UV-erasable capability - making it a drop-in replacement only for read functionality unless the host system supports Flash command protocols.
AT49BV040-12VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm 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:
- 50µs
- Access Time:
- 120 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49BV040-12VI FAQ
1.How can I place an order for AT49BV040-12VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040-12VI 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 AT49BV040-12VI reliable?
The price and inventory of AT49BV040-12VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040-12VI is usually 5 days.
3.What payment methods are accepted for AT49BV040-12VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040-12VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040-12VI?
AT49BV040-12VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040-12VI 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 AT49BV040-12VI?
For technical support, including AT49BV040-12VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040-12VI requirements.
6.How does Aetrix verify that AT49BV040-12VI is sourced from the original manufacturer or authorized distributors?
All AT49BV040-12VI 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 AT49BV040-12VI meets industry standards.
7.What is the process for return or replacement of AT49BV040-12VI?
All AT49BV040-12VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040-12VI, 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 AT49BV040-12VI part is unused and in its original packaging.
Return procedure for AT49BV040-12VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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