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Microchip Technology AT49LV002N-70VI
- Part No.:
- AT49LV002N-70VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49LV002N-70VI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,627
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Product details
Overview
AT49LV002N-70VI from Microchip Technology (formerly Atmel) is a 2 Mbit (256K × 8) single-supply 3.0–3.6 V in-system reprogrammable Flash memory IC used for nonvolatile code/data storage in embedded microcontroller boot systems. It delivers 70 ns read access time, 10-second chip erase, 30 µs/byte programming, 10,000 write cycles, and hardware data protection - enabling reliable firmware updates in industrial controllers and legacy instrumentation.
For engineers reviewing the AT49LV002N-70VI datasheet, AT49LV002N-70VI pinout, AT49LV002N-70VI application, or AT49LV002N-70VI equivalent, key selection criteria include its 32-pin PLCC package, boot block lockout capability (16 KB), sector-erasable architecture (two 8 KB parameter blocks + two main memory blocks), and compatibility with standard EPROM-like CE/OE/WE control timing.
Technical Context
This device implements a command-register-based Flash architecture with software-controlled sector and chip erase via six-cycle address/data sequences. Its internal program control logic eliminates external high-voltage programming signals, supporting in-system reprogramming using only 3.3 V supply and TTL-level inputs.
The memory array is partitioned into five distinct sectors: one 16 KB boot block (address 00000H–03FFFH), two 8 KB parameter blocks, and two main memory blocks (96 KB and 128 KB). Sector erase and byte programming are fully supported, with DATA polling (I/O7 complement) and toggle-bit (I/O6) methods for operation completion detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized as 262,144 words × 8 bits - sufficient for full bootloader + configuration data in 8-bit/16-bit MCU systems. |
| Read Access Time | 70 ns max - enables direct execution (XIP) from Flash in timing-critical 8051 or Z80-based designs without wait states. |
| Supply Voltage | 3.0 V to 3.6 V - compatible with 3.3 V system rails; no separate VPP required for programming or erase. |
| Erase Cycle Time | 10 seconds typical for full chip erase - supports field firmware updates with predictable downtime budgeting. |
| Programming Speed | 30 µs/byte typical - allows efficient patching of small code segments without long write latency. |
| Endurance | 10,000 program/erase cycles - validated for repeated firmware revision deployment in industrial HMI and PLC modules. |
| Standby Current | 50 µA CMOS - critical for battery-backed applications such as smart meters and portable test equipment. |
Pinout & Package
AT49LV002N-70VI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package with J-bend leads. Pin 1 is marked by a notch on the package body; pin 1 is a "Don't Connect" (DC) terminal per datasheet Rev. 0982D–FLASH–02/03.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A17 directly map to memory location selection. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - prevents bus contention in shared-memory systems. |
| OE | Output Enable | Active-low output control; used with CE to gate data onto bus - enables interleaved read/write timing in microprocessor interfaces. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming - central to all non-read operations. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface for read data output and program data input - matches standard 8-bit microcontroller data buses. |
| VCC | Power Supply | +3.0 V to +3.6 V supply; powers core logic and memory array - requires local 3.3 V regulation with ≤100 mV ripple. |
| GND | Ground Reference | Signal and power return path; must be low-impedance and separated from digital noise sources in mixed-signal PCB layouts. |
| RESET | Reset Input | Logic-high = normal operation; logic-low forces high-Z outputs and halts ongoing operations - used for safe recovery after power brownout. |
| DC (Pin 1) | No-Connect | Internally unconnected; must remain floating or tied to GND per design guidelines - not usable as strap or debug pin. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16 KB protected region (00000H–03FFFH) prevents accidental overwrite of bootloader code - ensures system reliability during field firmware updates. |
| Data Polling & Toggle Bit | I/O7 complement and I/O6 toggling provide real-time, hardware-verified feedback on program/erase completion - eliminates need for fixed delay timers in host firmware. |
| Sector-Erasable Architecture | Independent erase of two 8 KB parameter blocks and two main memory blocks enables granular firmware updates - reduces wear on unused sectors and extends lifetime. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulse rejection), and control-line interlock (OE low/CE high/WE high blocks writes) prevent spurious writes during EMI events. |
| Single 3.3 V Operation | No VPP or 12 V required for programming or erase - simplifies power design and eliminates high-voltage charge pumps or external programmers. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Instrumentation Bootloader |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in DIN-rail mounted programmable logic controllers operating in factory environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage and in-system reprogramming target for RS-485 or CAN-based firmware update commands - accessed via 8051-compatible bus interface. Use Value: 10,000-cycle endurance and 50 µA standby current ensure multi-year field operation without battery drain or premature wear-out in unattended deployments. |
Use Scenario: Hosting secure boot code and calibration tables in handheld multimeters, oscilloscopes, and signal generators where firmware integrity is safety-critical. IC Role / Device Role / Timing Role: Boot memory mapped at reset vector (0000H); executes first after power-on - protected by boot block lockout to prevent corruption during USB-based field updates. Use Value: 70 ns read access enables zero-wait-state execution, while sector erase allows independent update of calibration data without disturbing bootloader or application code. |
| Medical Device Configuration Memory | Telecom Line Card Parameter Storage |
Use Scenario: Retaining user-configurable settings (e.g., alarm thresholds, display preferences) across power cycles in Class II medical devices requiring IEC 60601 compliance. IC Role / Device Role / Timing Role: EEPROM-replacement data storage with deterministic 10-second erase and 30 µs/byte write - accessed via SPI-to-parallel bridge or dedicated microcontroller GPIO. Use Value: Hardware data protection (VCC sense, noise filter) guarantees write integrity during transient line disturbances common in hospital-grade AC mains. |
Use Scenario: Storing DSP coefficient tables, line impedance profiles, and protocol stacks in carrier-grade DSLAM and xDSL line cards deployed in telecom central offices. IC Role / Device Role / Timing Role: Parameter block (8 KB ×2) stores modulator/demodulator coefficients; main memory blocks hold firmware images - erased and updated independently per service window. Use Value: Sector architecture minimizes erase time per update (vs. full-chip), reducing service interruption windows while maintaining 10,000-cycle field lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV002N-70VI | 2.7–3.6 V supply range; includes BV-series voltage tolerance - wider VCC margin than LV variant. | Supports same PLCC-32 package and pinout but rated for broader voltage operation - suitable where 2.7 V brownout resilience is required. | Select when system VCC may dip below 3.0 V; retains identical timing, sector map, and command set. |
| SST39VF020-70-4C-NHE | 3.0–3.6 V supply; 70 ns access; 2 Mbit density; 512-byte uniform sectors - finer granularity than AT49LV002N's 8 KB/16 KB blocks. | Uniform sector architecture simplifies wear leveling in data-logging use cases; lacks boot block lockout feature. | Prefer for applications requiring frequent small-block updates; verify command compatibility - uses different unlock sequence (5555H/2AAAH). |
Compared with AT49BV002N-70VI and SST39VF020-70-4C-NHE, the AT49LV002N-70VI offers tighter 3.0–3.6 V operation and integrated boot protection ideal for safety-critical boot storage, whereas the BV variant adds low-voltage margin and the SST part enables higher granularity updates at the cost of lockout security.
Availability
AT49LV002N-70VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded instrumentation bootloaders, medical device configuration memory, and telecom line card parameter storage requiring stable component supply across extended product lifecycles.
Supply support for AT49LV002N-70VI 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 acquired Atmel in 2016 and maintains full support for the AT49LV series Flash memories, leveraging decades of nonvolatile memory IP and manufacturing expertise.
The AT49LV002N-70VI belongs to Atmel's legacy 3.3 V Flash memory product line, designed specifically for cost-sensitive, space-constrained embedded systems requiring in-system reprogrammability without high-voltage circuitry.
FAQ
What is the operating temperature range for the AT49LV002N-70VI?
The AT49LV002N-70VI is rated for industrial temperature operation from –40°C to +85°C. This range is confirmed in the AT49LV002 Ordering Information table (page 15), where the "-70VI" suffix explicitly denotes the industrial-grade version with 70 ns access time and V-grade qualification. The device meets full DC and AC specifications across this range.
Does the AT49LV002N-70VI support boot block protection, and how is it enabled?
Yes, the AT49LV002N-70VI includes a 16 KB boot block (00000H–03FFFH) with programmable lockout. It is enabled via a six-cycle command sequence: load AAH to 5555H, 55H to 2AAAH, 80H to 5555H, AAH to 5555H, 55H to 2AAAH, then 40H to 5555H. Once activated, the boot block cannot be erased or programmed at ≤5.5 V - ensuring bootloader integrity in the AT49LV002N-70VI.
What package type is used for the AT49LV002N-70VI, and is pin 1 connected?
The AT49LV002N-70VI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package (package code "32J"). Per datasheet Rev. 0982D–FLASH–02/03, pin 1 is designated "Don't Connect" (DC) - it is internally unconnected and must remain floating or tied to GND. This applies specifically to the AT49LV002N-70VI and other N-suffix variants in PLCC packaging.
How does the AT49LV002N-70VI detect completion of a byte programming cycle?
The AT49LV002N-70VI supports two hardware methods: DATA polling and Toggle Bit. During programming, reading the last written address returns the complement of the loaded data on I/O7; when complete, true data appears. Alternatively, I/O6 toggles between 0 and 1 during operation and stops toggling upon completion - both methods are valid for the AT49LV002N-70VI and require no external timing components.
Can the AT49LV002N-70VI be used as a direct replacement for EPROMs like the 27C256?
Yes, the AT49LV002N-70VI is pin-compatible and functionally compatible with 27C256 EPROMs in 32-pin DIP/PLCC packages, supporting identical CE/OE/WE control protocols and 8-bit data bus timing. However, unlike EPROMs, the AT49LV002N-70VI requires software command sequences for erase and program - no UV erasure or 12.5 V programming pulses needed.
AT49LV002N-70VI 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:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49LV002N-70VI FAQ
1.How can I place an order for AT49LV002N-70VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002N-70VI 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 AT49LV002N-70VI reliable?
The price and inventory of AT49LV002N-70VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002N-70VI is usually 5 days.
3.What payment methods are accepted for AT49LV002N-70VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002N-70VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002N-70VI?
AT49LV002N-70VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002N-70VI 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 AT49LV002N-70VI?
For technical support, including AT49LV002N-70VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002N-70VI requirements.
6.How does Aetrix verify that AT49LV002N-70VI is sourced from the original manufacturer or authorized distributors?
All AT49LV002N-70VI 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 AT49LV002N-70VI meets industry standards.
7.What is the process for return or replacement of AT49LV002N-70VI?
All AT49LV002N-70VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002N-70VI, 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 AT49LV002N-70VI part is unused and in its original packaging.
Return procedure for AT49LV002N-70VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LV002N-70VI Tags
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