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Microchip Technology AT49BV040-12JI
- Part No.:
- AT49BV040-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV040-12JI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,007
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Product details
Overview
AT49BV040-12JI 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, 16 KB boot block with programmable lockout, and 10,000 write/erase cycles. It supports in-system reprogramming without high-voltage inputs and is used in embedded firmware storage for industrial controllers requiring reliable nonvolatile code retention.
For engineers reviewing the AT49BV040-12JI datasheet, AT49BV040-12JI pinout, AT49BV040-12JI application, or AT49BV040-12JI equivalent, key selection considerations include its industrial temperature range (−40°C to +85°C), PLCC-32 package, boot-sector protection logic, and compatibility with standard 8-bit parallel bus interfaces in legacy microcontroller systems.
Technical Context
The AT49BV040-12JI implements a parallel-addressed, byte-programmable Flash architecture with hardware data protection via VCC sense, CE/OE/WE inhibit logic, and noise filtering on control lines. Its internal command register executes six-byte software sequences for chip erase, boot lock enable, and product identification.
It operates in three primary modes: Read (CE/OE low, WE high), Byte Program (CE low, WE low, OE high), and Standby (CE high). Data Polling (I/O7 complement toggle) and Toggle Bit (I/O6 oscillation) provide real-time program/erase cycle completion detection without external timing dependencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), enabling full firmware image storage for 8-bit MCUs with ≤512 KB code space |
| Read Access Time | 120 ns maximum - defines minimum bus cycle timing for 8051 or Z80-based systems |
| Supply Voltage Range | 2.7V–3.6V - supports direct connection to 3.3V rails without level-shifting in battery-backed industrial modules |
| Boot Block Size | 16 KB (00000H–03FFFH) - reserves lowest address space for secure bootloader code with permanent lockout capability |
| Byte Programming Time | 30 µs typical - enables field firmware updates at ~33 KB/s sustained rate under optimal conditions |
| Erase Cycle Time | 10 seconds max for full chip - requires system-level timeout handling but avoids external high-voltage circuitry |
| Endurance | 10,000 write/erase cycles - suitable for infrequent configuration or calibration data logging |
| Standby Current | 50 µA CMOS - critical for battery-operated devices where flash must retain state during deep sleep |
Pinout & Package
AT49BV040-12JI is packaged in a 32-lead Plastic J-leaded Chip Carrier (PLCC), measuring 18.5 mm × 18.3 mm × 3.56 mm, with pin 1 index marked and JEDEC MS-016 AE compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0 least significant bit for byte-level access |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with standard microprocessor data buses; high-impedance when deselected |
| CE | Chip Enable | Active-low chip select; must be low for any operation; inhibits programming if held high |
| OE | Output Enable | Active-low output control; disables outputs (high-Z) when high; required high during programming |
| WE | Write Enable | Active-low write strobe; latches address/data edges for programming; inhibits writes if high |
| VCC | Power Supply | 2.7V–3.6V main supply; powers all internal logic and charge pumps; VCC sense prevents writes below 1.8V |
| GND | Ground Reference | Signal and power ground reference plane; decoupling capacitor required within 10 mm of VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7V–3.6V Operation | Eliminates need for dual-voltage regulators or charge pumps, reducing BOM cost and PCB area in 3.3V systems |
| Boot Block Lockout | Hardware-enforced write protection for 16 KB sector (00000H–03FFFH), preventing accidental corruption of bootloader code |
| Data Polling & Toggle Bit | Dual asynchronous status reporting (I/O7 complement, I/O6 toggle) enables interrupt-driven programming without fixed delays |
| Hardware Data Protection | VCC sense, control-line inhibit logic, and 15 ns noise filter prevent spurious writes during power transients or EMI events |
| Industrial Temperature Range | Rated for −40°C to +85°C case temperature, validated for use in motor drives, PLCs, and outdoor metering equipment |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Bootloader Memory |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage device providing byte-accessible instruction memory mapped to the CPU's lower address space. Use Value: The 16 KB boot block lockout ensures bootloader integrity across 10,000+ field updates, while 50 µA standby current extends backup battery life during power loss. | Use Scenario: Hosting boot code and parameter tables for 8051- or Z80-based medical diagnostic instruments requiring regulatory-compliant firmware persistence. IC Role / Device Role / Timing Role: Parallel-interface Flash memory acting as primary ROM replacement with deterministic 120 ns read latency for instruction fetch timing. Use Value: Single 2.7V–3.6V operation eliminates level shifters between 3.3V MCU and memory bus, simplifying compliance with IEC 60601-1 creepage requirements. |
| Energy Meter Calibration Storage | Point-of-Sale Terminal Configuration Memory |
Use Scenario: Retaining calibrated constants and tariff tables in ANSI C12.20-certified electricity meters exposed to unregulated AC line-derived DC rails. IC Role / Device Role / Timing Role: Secure, low-power nonvolatile storage for metrology-critical parameters accessed only during initialization or maintenance mode. Use Value: Hardware data protection (VCC sense + noise filtering) prevents corruption during brown-out events common in utility-grade power supplies. | Use Scenario: Holding localized language packs, tax tables, and peripheral driver configurations in retail POS terminals operating 24/7 in commercial environments. IC Role / Device Role / Timing Role: Field-upgradable firmware partition accessed via standard 8-bit ISA-style bus cycles during cold boot or service mode. Use Value: Full-chip erase in ≤10 seconds enables rapid firmware rollbacks during store-level deployment failures without requiring specialized programmers. |
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, TSOP-48 package, no boot block lockout | Lacks dedicated boot sector protection; requires external logic or firmware for bootloader security | Choose when faster read speed is prioritized over hardware-secured boot code and board space allows larger TSOP-48 footprint |
| MX29LV400CTTI-70G | 4 Mbit, 70 ns access, 2.7V–3.6V supply, TSOP-48, top-boot configuration (boot block at highest addresses) | Top-boot architecture conflicts with AT49BV040-12JI's bottom-boot layout; requires PCB address map revision | Consider only if existing design uses top-boot convention and migration path includes address decoding changes |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT49BV040-12JI provides unique bottom-boot lockout in PLCC-32 for legacy 8-bit systems, whereas alternatives offer faster timing or different packaging but lack identical protection architecture and pinout compatibility.
Availability
AT49BV040-12JI is available at Aetrix Electronics and suitable for industrial PLCs, energy metering systems, and legacy microcontroller-based instrumentation requiring stable component supply across extended lifecycle commitments.
Supply support for AT49BV040-12JI 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 consumer applications.
The AT49BV/LV040 product line delivers single-supply Flash memory optimized for embedded systems needing in-system reprogrammability, hardware data protection, and industrial temperature resilience without external high-voltage circuitry.
FAQ
What is the operating temperature range for the AT49BV040-12JI?
The AT49BV040-12JI is rated for industrial operation from −40°C to +85°C case temperature, verified per AC/DC specifications in the official Atmel datasheet Rev. 0679D–03/01. This range supports deployment in motor control cabinets, outdoor utility meters, and factory-floor HMIs where ambient thermal stress exceeds commercial grade limits. The AT49BV040-12JI maintains full 120 ns read timing and 30 µs programming performance across this span.
Does the AT49BV040-12JI require high-voltage programming signals?
No, the AT49BV040-12JI performs all programming and erase operations using only its 2.7V–3.6V VCC supply - no external high-voltage generators or VPP pins are needed. Internal charge pumps derive necessary programming voltages, and six-byte software command sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h) initiate chip erase or boot lock. This eliminates high-voltage routing complexity and ESD risks in the AT49BV040-12JI design.
How is boot block protection enabled on the AT49BV040-12JI?
Boot block lockout on the AT49BV040-12JI is activated by executing a precise six-byte software sequence: load AAh to 5555h, 55h to 2AAAh, then 40h to 5555h - with a 1-second pause before final command. Once enabled, the 16 KB sector (00000H–03FFFH) becomes permanently unwritable and unerasable. Status is verified by reading I/O0 during software product ID mode: high = locked, low = unlocked. This irreversible action is confirmed in the AT49BV040-12JI datasheet section "Boot Block Lockout Feature Enable Algorithm".
What package type does the AT49BV040-12JI use?
The AT49BV040-12JI uses a 32-lead Plastic J-leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's ordering information table. Its dimensions are 18.5 mm × 18.3 mm × 3.56 mm with JEDEC MS-016 AE compliance. Pin 1 is marked by an index notch, and the body material is flame-retardant plastic. This package provides robust thermal and mechanical performance for reflow-soldered industrial PCBs where TSOP alternatives may suffer from solder joint fatigue.
Can the AT49BV040-12JI be used as a direct replacement for the AT49LV040-70JI?
No, the AT49BV040-12JI is not a direct replacement for the AT49LV040-70JI due to voltage and timing differences: the AT49BV040-12JI operates at 2.7V–3.6V with 120 ns access, while the AT49LV040-70JI requires 3.0V–3.6V and achieves 70 ns. Although pinout and command sets are identical, substituting the AT49BV040-12JI in a 70 ns-timed system may cause read setup violations. System-level timing analysis and validation are required before using the AT49BV040-12JI as a functional alternative.
AT49BV040-12JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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-PLCC (13.97x11.43)
AT49BV040-12JI FAQ
1.How can I place an order for AT49BV040-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040-12JI 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 AT49BV040-12JI reliable?
The price and inventory of AT49BV040-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040-12JI is usually 5 days.
3.What payment methods are accepted for AT49BV040-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040-12JI?
AT49BV040-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040-12JI 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 AT49BV040-12JI?
For technical support, including AT49BV040-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040-12JI requirements.
6.How does Aetrix verify that AT49BV040-12JI is sourced from the original manufacturer or authorized distributors?
All AT49BV040-12JI 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 AT49BV040-12JI meets industry standards.
7.What is the process for return or replacement of AT49BV040-12JI?
All AT49BV040-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040-12JI, 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 AT49BV040-12JI part is unused and in its original packaging.
Return procedure for AT49BV040-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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