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Microchip Technology AT49LV002-90JI
- Part No.:
- AT49LV002-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49LV002-90JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,189
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Product details
Overview
AT49LV002-90JI 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 and data storage in embedded microcontroller systems. It delivers 90 ns read access time, 10-second chip erase, byte-programmable architecture with sector protection, and industrial temperature operation (−40°C to +85°C) in a 32-lead PLCC package.
For engineers reviewing the AT49LV002-90JI datasheet, AT49LV002-90JI pinout, AT49LV002-90JI application, or AT49LV002-90JI equivalent, this page provides verified technical context, real-world use cases, pin-level design meaning, and validated alternative options for boot code storage, firmware update, and parameter retention in industrial control and legacy embedded platforms.
Technical Context
This device implements a standard parallel Flash interface with CE/OE/WE control logic, supporting EPROM-like read timing and command-based programming/erasure. Its internal architecture includes a 16 KB boot block with lockout enable, two 8 KB parameter blocks, and two main memory blocks (96 KB and 128 KB), all accessible via A0–A17 address lines and I/O0–I/O7 bidirectional data bus.
It uses hardware data protection (VCC sense, noise filtering, and control-line inhibit), supports DATA polling and Toggle Bit for cycle completion detection, and enables boot block reprogramming override via 12 V on RESET - though that feature is disabled in the N-suffix variants (not applicable to AT49LV002-90JI, which lacks N).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), enabling full 8-bit microcontroller code storage without bank switching |
| Read Access Time | 90 ns max - meets timing requirements for 11 MHz Z80, 8051, and 68K-based systems |
| Supply Voltage | 3.0 V to 3.6 V - compatible with 3.3 V logic rails and eliminates need for 5 V support circuitry |
| Erase Cycle Time | 10 seconds typical for full chip erase - enables field firmware updates within tight maintenance windows |
| Byte Programming Time | 30 µs typical - allows fine-grained patching of configuration or calibration data without full reflash |
| Endurance | 10,000 write/erase cycles - sufficient for infrequent firmware upgrades over 10+ year product lifecycles |
| Operating Temperature | −40°C to +85°C - qualified for industrial automation, motor drives, and outdoor metering applications |
Pinout & Package
AT49LV002-90JI is housed in a 32-lead Plastic Leaded Chip Carrier (PLCC) package, pin-compatible with industry-standard 32-pin Flash memory footprints. The package supports reflow soldering and offers robust thermal and mechanical performance for industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A17 required for top memory region access |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8080/8051/Z80 bus protocols; high-impedance during standby |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during shared-memory access |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming |
| RESET | Reset Input | Active-low reset; halts ongoing program/erase and forces high-Z outputs; not used for boot override in LV variant |
| VCC | Power Supply | 3.0–3.6 V supply; internal regulation ensures stable core voltage across rail tolerance |
| GND | Ground Reference | Common return path for all signals; decoupling capacitor placement critical near pin 16 |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16 KB protected region (00000H–03FFFH) prevents accidental overwrite of bootloader code during field updates |
| Data Polling & Toggle Bit | Hardware-supported status feedback (I/O7 complement / I/O6 toggle) eliminates need for fixed delay timers in firmware |
| Sector Erase Flexibility | Independent erasure of two 8 KB parameter blocks and two main memory blocks enables modular firmware partitioning |
| Hardware Write Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line gating prevent spurious writes |
| Low Power Standby | 50 µA CMOS standby current enables battery-backed operation in sleep-mode systems |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Bootloader Retention |
|---|---|
Use Scenario: Storing firmware images and configuration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile code storage with 90 ns read timing synchronized to 8051 or ColdFire MCU bus cycles. Use Value: Enables field-upgradable firmware while maintaining boot integrity via hardware-locked 16 KB boot block. |
Use Scenario: Preserving secure boot code in aging medical devices and test equipment where replacement with modern SPI Flash is not feasible due to PCB layout constraints. IC Role / Device Role / Timing Role: Pin-compatible EPROM replacement delivering identical 32-pin PLCC footprint and parallel bus timing. Use Value: Eliminates need for external 5 V programming voltage while retaining full in-system reprogrammability at 3.3 V. |
| Parameter Configuration Memory | Motor Drive Calibration Storage |
Use Scenario: Holding user-adjustable parameters (PID gains, limits, offsets) in HVAC controllers and power supplies requiring infrequent but reliable updates. IC Role / Device Role / Timing Role: Byte-programmable nonvolatile memory accessed via microcontroller GPIO-banged or dedicated bus interface. Use Value: Supports individual parameter edits without full memory erase - reducing update latency and wear on main memory blocks. |
Use Scenario: Storing motor-specific calibration coefficients (phase advance, current loop gains) in variable-frequency drives deployed in harsh industrial settings. IC Role / Device Role / Timing Role: Industrial-grade Flash memory with −40°C to +85°C qualification and 10,000-cycle endurance. Use Value: Guarantees long-term data retention (>20 years) and withstands repeated thermal cycling in enclosed drive cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF020-90-4C-NHE | 3.0–3.6 V, 2 Mbit, 90 ns, PLCC-32, but uses SST's "byte-write" command set and lacks boot block lockout | No hardware-enforced boot protection; requires software-managed write disable for bootloader regions | Preferred when simplified command protocol and lower cost outweigh boot security needs |
| MX29LV020TC-90G | 3.0–3.6 V, 2 Mbit, 90 ns, PLCC-32, supports CFI query mode and has 64 KB uniform sectors instead of mixed boot/parameter/main blocks | Uniform sectoring simplifies erase management but removes dedicated parameter block isolation | Chosen for new designs needing CFI compatibility and standardized sector layout across Flash families |
Compared with SST39VF020-90-4C-NHE and MX29LV020TC-90G, the AT49LV002-90JI uniquely combines industrial temperature rating, hardware boot lockout, and legacy Atmel command compatibility - making it irreplaceable in existing systems relying on its specific sector architecture and RESET-based override capability.
Availability
AT49LV002-90JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded bootloader retention, and motor drive calibration storage requiring stable component supply across extended production lifecycles.
Supply support for AT49LV002-90JI 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 legacy Atmel Flash products including the AT49LV series, ensuring long-term documentation, reliability data, and obsolescence mitigation.
The AT49LV002-90JI belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for 3 V-only embedded systems requiring in-system reprogrammability without high-voltage programming circuitry.
FAQ
What is the operating voltage range for the AT49LV002-90JI?
The AT49LV002-90JI operates from 3.0 V to 3.6 V DC. This single-supply range eliminates the need for 5 V programming voltages and ensures compatibility with modern 3.3 V logic systems. Operation below 3.0 V disables programming functions via internal VCC sense circuitry, preventing inadvertent writes during brown-out conditions.
Does the AT49LV002-90JI support hardware boot block protection?
Yes, the AT49LV002-90JI includes a 16 KB boot block (address range 00000H–03FFFH) with programmable lockout. Once enabled via the six-byte command sequence, this region becomes immune to erase and program commands under standard 3.3 V operation - preserving bootloader integrity in field-deployed systems.
What package type is used for the AT49LV002-90JI?
The AT49LV002-90JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as 32J in Atmel's ordering nomenclature. This surface-mount package features J-shaped leads, supports reflow soldering, and maintains pin compatibility with legacy 32-pin Flash memory sockets.
Can the AT49LV002-90JI be erased sector-by-sector?
Yes, the AT49LV002-90JI supports independent sector erase for both 8 KB parameter blocks and the two main memory blocks (96 KB and 128 KB). Sector erase uses a six-bus-cycle command with address-dependent sector selection, enabling targeted updates without affecting protected boot code or unrelated configuration data.
What is the maximum endurance rating for the AT49LV002-90JI?
The AT49LV002-90JI is rated for a minimum of 10,000 program/erase cycles per memory location. This endurance level is sufficient for applications involving periodic firmware updates or infrequent parameter adjustments over multi-year deployments in industrial and embedded environments.
AT49LV002-90JI 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:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 90 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)
AT49LV002-90JI FAQ
1.How can I place an order for AT49LV002-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002-90JI 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 AT49LV002-90JI reliable?
The price and inventory of AT49LV002-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002-90JI is usually 5 days.
3.What payment methods are accepted for AT49LV002-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002-90JI?
AT49LV002-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002-90JI 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 AT49LV002-90JI?
For technical support, including AT49LV002-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002-90JI requirements.
6.How does Aetrix verify that AT49LV002-90JI is sourced from the original manufacturer or authorized distributors?
All AT49LV002-90JI 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 AT49LV002-90JI meets industry standards.
7.What is the process for return or replacement of AT49LV002-90JI?
All AT49LV002-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002-90JI, 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 AT49LV002-90JI part is unused and in its original packaging.
Return procedure for AT49LV002-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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