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Microchip Technology AT49BV040-12VC
- Part No.:
- AT49BV040-12VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49BV040-12VC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,773
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Product details
Overview
AT49BV040-12VC 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.
For engineers reviewing the AT49BV040-12VC datasheet, AT49BV040-12VC pinout, AT49BV040-12VC application, or AT49BV040-12VC equivalent, this device serves as a drop-in replacement for legacy 5V EPROM-based boot code storage in embedded controllers, industrial HMIs, and telecom firmware modules requiring battery-voltage operation and data integrity protection.
Technical Context
The AT49BV040-12VC implements a CMOS-based NOR Flash architecture with dual-line control (CE/OE) enabling bus contention avoidance during read cycles. Its internal command register executes software-controlled chip erase, byte programming, and boot block lockout via six-byte address/data sequences at fixed locations (e.g., 5555H/2AAAH).
Hardware data protection includes VCC sense (<1.8V inhibit), noise filtering (<15 ns pulse rejection on WE/CE), and control-line gating (OE low/CE high/WE high blocks writes). Data Polling (I/O7 complement) and Toggle Bit (I/O6 toggling) provide real-time program/erase cycle status without external timing dependencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8 bits) - supports full firmware image storage for 8-bit microcontrollers with ≤512 KB code space. |
| Read Access Time | 120 ns - meets timing requirements for 8 MHz Z80/8051-based systems with no wait-state insertion. |
| Supply Voltage | 2.7V to 3.6V - enables direct interface with 3.3V logic and battery-backed operation without level shifters. |
| Boot Block Size | 16 KB (00000H–03FFFH) - isolates critical bootloader code from field updates while allowing main array reprogramming. |
| Endurance | 10,000 write/erase cycles - sufficient for firmware update cycles in industrial gateways with 5-year field life. |
| Standby Current | 50 µA CMOS - reduces quiescent power in always-on embedded devices powered by coin cells or energy harvesters. |
| Erase Time | 10 seconds (chip-wide) - enables rapid field firmware recovery without requiring external high-voltage generators. |
Pinout & Package
AT49BV040-12VC is packaged in a 32-lead Plastic Thin Small Outline Package (TSOP), 8 mm × 14 mm footprint (JEDEC MO-142 BA, package code 32V), compatible with automated SMT assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A15 used for boot block (00000H–03FFFH), A16–A18 for main array selection. |
| CE | Chip Enable | Active-low global enable; when high, forces outputs to high-impedance and disables all internal operations including polling. |
| OE | Output Enable | Active-low read control; used with CE to gate output drivers and prevent bus contention during multi-device sharing. |
| WE | Write Enable | Active-low programming/erase control; latches address/data on falling edge and initiates internal command execution. |
| I/O0–I/O7 | Data I/O Bus | Bidirectional 8-bit data path; supports byte-level reads/writes; I/O7 used for Data Polling, I/O6 for Toggle Bit status indication. |
| VCC | Power Supply | 2.7V–3.6V supply input; internal voltage regulator ensures stable core operation across full range. |
| GND | Ground Reference | Signal and power ground reference; decoupling capacitor (0.1 µF) required within 5 mm of VCC pin per datasheet layout rules. |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7V–3.6V Operation | Eliminates need for 5V/12V programming supplies - simplifies power architecture in portable and battery-powered systems. |
| 16 KB Boot Block Lockout | Hardware-enforced write protection prevents accidental corruption of bootloader code during field firmware updates. |
| Data Polling & Toggle Bit | Real-time, hardware-verified completion signaling - removes dependency on fixed delay timers in host MCU firmware. |
| Software Command Set | Standardized 6-byte erase/lockout sequences (e.g., 5555H/AA → 2AAAH/55 → 5555H/80) ensure interoperability across Atmel Flash families. |
| Hardware Data Protection | VCC sense + noise filtering + control-line gating prevents spurious writes during brown-out or EMI events - critical for automotive and industrial environments. |
Applications
| Industrial PLC Firmware Storage | Telecom Line Card Boot Code |
|---|---|
|
Use Scenario: Storing boot firmware and configuration parameters in programmable logic controllers deployed in factory automation environments with wide temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile boot memory providing immediate code execution upon power-up; 120 ns access time aligns with 8 MHz CPU bus timing. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates; 50 µA standby current extends uptime during mains failure with backup capacitors. |
Use Scenario: Holding initialization code and DSP microcode in carrier-grade DSLAM line cards requiring hot-swap capability and zero-downtime firmware upgrades. IC Role / Device Role / Timing Role: Primary firmware repository accessed during cold start and reset recovery; supports in-system reprogramming via JTAG-hosted flash utilities. Use Value: Chip-erase in ≤10 seconds enables rapid service restoration; 2.7V operation allows seamless integration with 3.3V backplane power domains. |
| Medical Diagnostic Device BIOS | Automotive Body Control Module |
|
Use Scenario: Storing safety-critical boot routines and calibration tables in portable ultrasound and ECG analyzers subject to IEC 60601-1 compliance requirements. IC Role / Device Role / Timing Role: Secure boot memory with verified write protection; boot block (00000H–03FFFH) holds certified bootloader validated during regulatory testing. Use Value: Hardware lockout prevents unauthorized modification of FDA-approved firmware; 10,000-cycle endurance exceeds 10-year product lifecycle expectations. |
Use Scenario: Hosting firmware for LIN gateway modules in vehicle body electronics, operating in under-hood environments with thermal cycling and electrical transients. IC Role / Device Role / Timing Role: Robust nonvolatile storage for CAN/LIN protocol stacks and sensor calibration data; withstands ISO 7637-2 pulse 5a/b load dump events via VCC sense protection. Use Value: 2.7V minimum supply tolerance accommodates battery sag during cranking; toggle bit detection enables deterministic flash update sequencing in ASAM-compliant flashing tools. |
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, 3.0V–3.6V supply, no boot block lockout; uses different command set (SST proprietary). | Lacks hardware-enforced boot sector protection; requires firmware-level write guard implementation. | Select when faster read speed is prioritized over boot code security and legacy Atmel command compatibility is not required. |
| MX29LV400CTTI-90G | 4 Mbit, 90 ns access, 3.0V–3.6V supply, top-boot configuration (boot block at 7C000H–7FFFFH), different pinout (A16/A17 swapped). | Top-boot orientation conflicts with AT49BV040-12VC's bottom-boot layout; requires PCB redesign for address mapping. | Select only if existing design uses top-boot architecture and SST/Macronix toolchain support is already established. |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-90G, the AT49BV040-12VC provides guaranteed bottom-boot block placement, Atmel-standard command compatibility, and integrated VCC-sense protection - making it optimal for designs requiring field-upgradable bootloader integrity without hardware modifications.
Availability
AT49BV040-12VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, telecom line card boot code, and medical diagnostic device BIOS requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT49BV040-12VC 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 manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49BV/LV040 series was designed as a battery-voltage-compatible Flash memory family targeting legacy EPROM replacement in embedded systems where low-power operation and in-system reprogrammability are essential.
FAQ
What is the maximum operating temperature range for the AT49BV040-12VC?
The AT49BV040-12VC is rated for industrial operation from -40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table on page 5 of the datasheet, where the "AT49BV040-12" row lists "Ind." (industrial) as its operating temperature grade. The "VC" suffix denotes the 32-lead TSOP (8×14 mm) package variant qualified across this full range.
Does the AT49BV040-12VC support true byte-level programming without erasing the entire chip first?
Yes, the AT49BV040-12VC supports byte-by-byte programming, but only after the target memory location has been erased. As stated on page 2, "Before a byte can be reprogrammed, the 512K bytes memory array must be erased." Erasure resets all bits to logical "1"; programming then sets selected bits to "0". The device does not support direct overwriting of "0" bits - only erase-to-"1", then program-to-"0" transitions are allowed.
How is boot block lockout enabled on the AT49BV040-12VC?
Boot block lockout is enabled via a six-byte software command sequence: load AAH to address 5555H, 55H to 2AAAH, 80H to 5555H, AAH to 5555H, 55H to 2AAAH, and 40H to 5555H (page 10). Once executed, the boot block (00000H–03FFFH) becomes permanently write-protected - no further erases or programming are possible in that region. The lockout state is verified by reading I/O0 at address 00002H in product ID mode.
What package type does the AT49BV040-12VC use, and what are its key mechanical dimensions?
The AT49BV040-12VC uses a 32-lead Plastic Thin Small Outline Package (TSOP) with an 8 mm × 14 mm body size (JEDEC MO-142 BA, package code 32V). As shown in the "Packaging Information" section (page 12), the package has a nominal height of 1.20 mm max, lead pitch of 0.50 mm, and overall length/width of 14.2 mm × 12.5 mm - optimized for high-density PCB layouts and automated pick-and-place assembly.
Can the AT49BV040-12VC be interfaced directly with 5V logic systems?
No, the AT49BV040-12VC is not 5V-tolerant on its I/O lines. While address and control inputs (A0–A18, CE, OE, WE) accept 0–5.5V levels per page 4, the I/O0–I/O7 pins are limited to 0–VCC + 0.6V. With VCC at 3.6V max, I/O voltage must stay below 4.2V. Direct connection to 5V buses risks damage; level-shifting circuitry (e.g., TXB0108) is required for safe 5V system interfacing.
AT49BV040-12VC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49BV040-12VC FAQ
1.How can I place an order for AT49BV040-12VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040-12VC 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 AT49BV040-12VC reliable?
The price and inventory of AT49BV040-12VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040-12VC is usually 5 days.
3.What payment methods are accepted for AT49BV040-12VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040-12VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040-12VC?
AT49BV040-12VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040-12VC 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 AT49BV040-12VC?
For technical support, including AT49BV040-12VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040-12VC requirements.
6.How does Aetrix verify that AT49BV040-12VC is sourced from the original manufacturer or authorized distributors?
All AT49BV040-12VC 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 AT49BV040-12VC meets industry standards.
7.What is the process for return or replacement of AT49BV040-12VC?
All AT49BV040-12VC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040-12VC, 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 AT49BV040-12VC part is unused and in its original packaging.
Return procedure for AT49BV040-12VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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