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Microchip Technology AT49LV040-12JI
- Part No.:
- AT49LV040-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49LV040-12JI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,657
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Product details
Overview
AT49LV040-12JI from Microchip Technology is a 4-Mbit (512K × 8) low-voltage parallel EEPROM with 120 ns access time, CMOS-compatible I/O, and single 3.0–3.6 V supply operation. It supports byte-write and page-write modes, features hardware data protection via WP pin, and is used in embedded systems for firmware storage and configuration retention.
For engineers reviewing the AT49LV040-12JI datasheet, AT49LV040-12JI pinout, AT49LV040-12JI application, or AT49LV040-12JI equivalent, key selection criteria include write endurance (100,000 cycles), data retention (100 years), JEDEC-standard 32-pin PLCC package, and compatibility with legacy 8-bit microcontroller address/data buses.
Technical Context
The AT49LV040-12JI implements a standard parallel EEPROM architecture with asynchronous read/write timing, internal address latching, and automatic write-cycle termination. It uses floating-gate CMOS technology and includes on-chip charge pump for internal high-voltage generation during programming.
Write operations require no external high voltage-only VCC (3.0–3.6 V) is needed. The device supports both byte-level and 64-byte page-level writes, with built-in write inhibit during power transitions via the READY/BUSY flag and hardware write protect (WP) pin functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (512K × 8 bits); provides sufficient space for boot code or parameter tables in 8-bit MCU systems. |
| Access Time | 120 ns max at VCC = 3.3 V; enables direct interface with 8-MHz Z80 or 8051 derivatives without wait states. |
| Supply Voltage | 3.0–3.6 V only; eliminates need for dual-supply design or level-shifting in 3.3 V system environments. |
| Write Endurance | 100,000 program/erase cycles per byte; supports field-updatable calibration data in industrial controllers. |
| Data Retention | 100 years at +25°C; ensures long-term reliability of stored configuration without battery backup. |
| Package | 32-pin PLCC (11.43 mm × 13.97 mm); compatible with standard socketed or reflow-soldered 8-bit peripheral footprints. |
Pinout & Package
AT49LV040-12JI is housed in a 32-pin Plastic Leaded Chip Carrier (PLCC) with J-lead profile, designed for surface-mount assembly and socket compatibility. Pin 1 is marked by a notch on the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-byte addressing; A0 is LSB for byte-level access. |
| Q0–Q7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; TTL/CMOS-compatible with 3.3 V logic thresholds. |
| CE# | Chip Enable | Active-low enable controlling device selection; must be low for read/write operations. |
| OE# | Output Enable | Active-low control for data bus output drivers; allows shared bus operation with other peripherals. |
| WE# | Write Enable | Active-low signal initiating byte or page write; sampled on rising edge of WE# to latch data. |
| WP# | Write Protect | Hardware lock preventing accidental writes when pulled low; overrides internal write commands. |
| RDY/BUSY# | Ready/Busy Flag | Open-drain output indicating write cycle completion; used for polling or interrupt-driven timing. |
Key Features
| Feature | Design Value |
|---|---|
| Single 3.3 V Supply Operation | Eliminates need for 5 V rail or voltage translators in modern low-voltage embedded designs. |
| Page Write Mode (64 bytes) | Reduces firmware update time by up to 64× versus byte-write for contiguous memory blocks. |
| Hardware Write Protection (WP#) | Prevents corruption during power-up/down or software faults without requiring firmware intervention. |
| RDY/BUSY# Output | Enables deterministic timing control for write cycles without fixed delay loops or timeouts. |
| JEDEC Standard PLCC-32 Footprint | Ensures drop-in replacement capability and compatibility with existing PCB layouts and test fixtures. |
Applications
| Industrial PLC Configuration Storage | Legacy 8-bit MCU Boot Code Storage |
|---|---|
Use Scenario: Storing I/O mapping tables and calibration coefficients in programmable logic controllers operating in wide-temperature industrial environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to an 80C51-based controller via parallel bus. Use Value: 100-year data retention and 100,000 write cycles ensure reliable field updates over 15+ year product lifecycles without battery support. | Use Scenario: Holding boot firmware for Z80 or 8085-based medical instrumentation where ROM replacement is impractical. IC Role / Device Role / Timing Role: Parallel-addressable executable code storage mapped into lower memory space with 120 ns access. Use Value: Direct CPU bus compatibility and no external high-voltage generator simplify board design and reduce BOM count. |
| Point-of-Sale Terminal Parameter Tables | Telecom Line Card Revision Tracking |
Use Scenario: Maintaining tax rate tables, language strings, and printer configuration in retail terminals subject to frequent regional updates. IC Role / Device Role / Timing Role: Field-updatable parameter store accessed via dedicated 8-bit peripheral bus segment. Use Value: Page-write mode enables full table reload in under 100 ms, minimizing service downtime during firmware patches. | Use Scenario: Recording hardware revision IDs and calibration timestamps on carrier-grade TDM line cards deployed in central offices. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile log memory with hardware write lock (WP#) enabled permanently. Use Value: Hardware WP# prevents accidental overwrite during hot-swap events or firmware resets, ensuring audit trail integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C040-15JU | 5 V-only operation (4.5–5.5 V); 150 ns access time; same 4 Mbit density and PLCC-32 package. | Requires 5 V rail; not suitable for mixed 3.3 V systems without level translation. | Select when legacy 5 V design compatibility is mandatory and power supply headroom permits. |
| MX29LV040CTTI-70G | 3.3 V operation; 70 ns access time; 4 Mbit density; TSOP-32 package (not PLCC). | Different footprint and thermal profile; requires PCB redesign for surface-mount integration. | Select when faster access and smaller board area are prioritized over socket compatibility or rework flexibility. |
Compared with AT28C040-15JU and MX29LV040CTTI-70G, the AT49LV040-12JI uniquely balances 3.3 V operation, 120 ns timing, and PLCC-32 socketability-making it optimal for field-serviceable industrial controllers where voltage compatibility and mechanical replaceability are jointly critical.
Availability
AT49LV040-12JI is available at Aetrix Electronics and suitable for industrial PLCs, legacy 8-bit medical devices, and telecom line cards requiring stable component supply across extended product lifecycles.
Supply support for AT49LV040-12JI 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
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions for industrial, automotive, and consumer applications.
The AT49LV040-12JI belongs to Microchip's legacy parallel EEPROM product line, engineered for backward compatibility with 8-bit microprocessor buses and long-term reliability in unattended equipment.
FAQ
What is the maximum operating temperature range for the AT49LV040-12JI?
The AT49LV040-12JI is specified for industrial temperature operation from –40°C to +85°C. This range is validated per Microchip's qualification testing and supports deployment in harsh environments such as factory automation panels and outdoor telecom enclosures. The AT49LV040-12JI maintains full 120 ns access time and write functionality across this entire range without derating.
Does the AT49LV040-12JI require an external high-voltage programming supply?
No, the AT49LV040-12JI integrates an on-chip charge pump that generates all required programming voltages from the standard 3.0–3.6 V VCC supply. No external VPP or programming adapter is needed. This feature simplifies system design and ensures safe, single-rail operation of the AT49LV040-12JI in battery-powered or low-power embedded applications.
How does the RDY/BUSY# pin function during a write cycle in the AT49LV040-12JI?
The RDY/BUSY# pin is an open-drain output that goes low at the start of any write operation (byte or page) and returns high only after internal programming and verification complete. It enables precise polling or interrupt-driven timing control without fixed delays. This behavior is guaranteed across all valid VCC and temperature conditions for the AT49LV040-12JI.
Can the AT49LV040-12JI be used as a direct replacement for the AT28C040 in existing designs?
No-the AT49LV040-12JI operates at 3.0–3.6 V only, while the AT28C040 requires 4.5–5.5 V. Although both share the same 4 Mbit density and PLCC-32 package, voltage incompatibility prevents direct substitution without modifying the power delivery network. The AT49LV040-12JI is not a drop-in replacement for the AT28C040 unless the host system supports dual-voltage rails or level translation.
What is the page size and maximum page-write time for the AT49LV040-12JI?
The AT49LV040-12JI supports a 64-byte page-write mode, with a maximum page-write time of 20 ms (typical 10 ms) at VCC = 3.3 V and +25°C. This allows efficient bulk updates-for example, writing an entire 64-byte parameter block in one command instead of 64 separate byte writes. The AT49LV040-12JI automatically handles internal address incrementing and write-cycle termination within this window.
AT49LV040-12JI 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:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49LV040-12JI FAQ
1.How can I place an order for AT49LV040-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV040-12JI 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 AT49LV040-12JI reliable?
The price and inventory of AT49LV040-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV040-12JI is usually 5 days.
3.What payment methods are accepted for AT49LV040-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV040-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV040-12JI?
AT49LV040-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV040-12JI 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 AT49LV040-12JI?
For technical support, including AT49LV040-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV040-12JI requirements.
6.How does Aetrix verify that AT49LV040-12JI is sourced from the original manufacturer or authorized distributors?
All AT49LV040-12JI 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 AT49LV040-12JI meets industry standards.
7.What is the process for return or replacement of AT49LV040-12JI?
All AT49LV040-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV040-12JI, 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 AT49LV040-12JI part is unused and in its original packaging.
Return procedure for AT49LV040-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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