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Microchip Technology AT49LV002-90PC
- Part No.:
- AT49LV002-90PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49LV002-90PC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,869
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Product details
Overview
AT49LV002-90PC 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 systems. It delivers 70 ns read access time, 10-second chip erase, byte-programmable architecture with sector protection, and operates across commercial temperature range (0°C to 70°C) in 32-pin PDIP package.
For engineers reviewing the AT49LV002-90PC datasheet, AT49LV002-90PC pinout, AT49LV002-90PC application, or AT49LV002-90PC equivalent, key selection criteria include boot-block lockout capability, DATA polling/Toggle Bit end-of-write detection, hardware write protection, low 50 µA CMOS standby current, and compatibility with standard EPROM-like bus interface timing.
Technical Context
The AT49LV002-90PC implements a sector-organized Flash architecture with one 16K-byte boot block (address 00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K + 128K bytes). It uses standard CE/OE/WE control logic identical to EPROMs, enabling drop-in replacement without bus contention.
Programming and erase operations are executed via six-byte command sequences latched on WE/CE edges; internal timers eliminate external clock dependency. Boot block lockout-enabled by a specific command sequence-prevents accidental reprogramming of secure startup code, and can be overridden only by applying 12 V to RESET during operation (not supported on N-suffix variants).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - supports full firmware image storage for 8-bit MCUs. |
| Read Access Time | 90 ns max - ensures compatibility with 11 MHz system buses without wait states. |
| Supply Voltage | 3.0 V to 3.6 V - single 3.3 V rail operation eliminates need for dual-voltage regulators. |
| Chip Erase Time | 10 seconds typical - enables rapid field firmware updates without extended downtime. |
| Byte Programming Time | 30 µs typical - allows fine-grained patching and configuration writes without blocking system execution. |
| End-of-Write Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - provides deterministic software-controlled completion signaling. |
| Standby Current | 50 µA CMOS - critical for battery-backed applications requiring ultra-low quiescent power. |
| Endurance | 10,000 program/erase cycles - validated for long-term field deployment in industrial controllers. |
Pinout & Package
AT49LV002-90PC is supplied in a 32-pin Plastic Dual In-line Package (PDIP), 0.600" wide (package code 32P6). Pin 1 is index corner; pin 16 is VCC; pin 32 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A17 map directly to memory locations. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read/write; high-impedance when CE or OE is inactive. |
| 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 gate; controls data bus drive; used with CE to prevent bus contention. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command sequences. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-impedance outputs; 12 V override enables boot block reprogramming. |
| VCC | Power Supply | +3.0 V to +3.6 V supply; decoupling required near pin 16 per layout guidelines. |
| GND | Ground Reference | Signal and power ground reference; pin 32 connects to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16K-byte protected region (00000H–03FFFH) prevents accidental overwrite of bootloader code; enabled via 6-byte command sequence. |
| 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). |
| Sector-Erase Flexibility | Independent erasure of two 8K parameter blocks and two main memory blocks (96K/128K) enables modular firmware updates without full chip erase. |
| EPROM-Compatible Interface | Standard CE/OE/WE timing and bus behavior allows direct substitution into legacy EPROM-based designs with no logic changes. |
| Low-Power Operation | 25 mA active current and 50 µA CMOS standby current support energy-constrained embedded systems and battery backup modes. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; executes boot code from protected 16K boot block upon power-up. Use Value: Enables remote firmware upgrades without hardware replacement; boot block lockout guarantees integrity of safety-critical startup routines. | Use Scenario: Retaining device-specific calibration parameters and regulatory-compliant configuration profiles in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parameter block (8K × 2) stores user-modifiable settings; accessed via standard microcontroller address/data bus during initialization. Use Value: Sector-level erase allows safe update of calibration data without disturbing firmware in main memory blocks. |
| Automotive Body Control Module | Consumer Set-Top Box Bootloader |
Use Scenario: Hosting firmware for door-lock, lighting, and window-control logic in automotive body electronics modules. IC Role / Device Role / Timing Role: Main memory blocks (96K + 128K) store application code; boot block holds secure boot loader verified at power-on reset. Use Value: 10,000-cycle endurance and -40°C to +85°C industrial-grade variants (e.g., AT49LV002-90PI) ensure reliability over vehicle lifetime. | Use Scenario: Providing boot code and recovery image storage in digital TV set-top boxes requiring field-upgradable firmware. IC Role / Device Role / Timing Role: Boot block (16K) contains signed bootloader; main memory stores application firmware and UI assets. Use Value: DATA polling and Toggle Bit allow precise synchronization of firmware updates without fixed delay loops, improving OTA update robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV002-90PC | 2.7–3.6 V supply range; includes BV-series voltage tolerance; same pinout and timing. | Broader VCC range supports mixed 2.7 V/3.3 V system rails; otherwise functionally identical to LV variant. | Select when design requires flexibility across 2.7 V minimum supply or legacy BV-family qualification. |
| SST39VF020-90-4C-NHE | 3.0–3.6 V supply; 90 ns access; 2 Mbit density; 32-pin PDIP; supports byte/sector/block erase but lacks boot block lockout. | No dedicated boot sector protection; relies on software-only security; different command set and polling mechanism. | Choose for cost-sensitive applications where hardware-enforced boot code protection is not required. |
Compared with AT49BV002-90PC and SST39VF020-90-4C-NHE, the AT49LV002-90PC offers tighter VCC regulation (3.0–3.6 V only), guaranteed boot block lockout, and Atmel's proven command-set compatibility-making it optimal for safety-aware embedded systems where firmware integrity is non-negotiable.
Availability
AT49LV002-90PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive body control module applications requiring stable component supply and long-term obsolescence management.
Supply support for AT49LV002-90PC 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 memory products including the AT49LV series.
The AT49LV002 product line was designed for cost-effective, in-system reprogrammable nonvolatile storage in resource-constrained 8-bit and 16-bit microcontroller systems, emphasizing reliability, low-power operation, and EPROM drop-in compatibility.
FAQ
What is the operating voltage range for the AT49LV002-90PC?
The AT49LV002-90PC operates within a strict 3.0 V to 3.6 V supply range. Unlike the AT49BV002 variant, it does not support voltages down to 2.7 V. This narrower range ensures stable programming margins and reduced leakage in commercial-temperature applications. The AT49LV002-90PC must be powered from a well-regulated 3.3 V source meeting ±10% tolerance.
Does the AT49LV002-90PC support boot block protection, and how is it enabled?
Yes, the AT49LV002-90PC includes a 16K-byte boot block (00000H–03FFFH) with hardware-enforced programming lockout. It is enabled by executing a precise six-byte command sequence (AAh, 55h, 80h, AAh, 55h, 40h) to address 5555h. Once activated, the boot block cannot be erased or programmed using ≤5.5 V signals-ensuring bootloader integrity in the AT49LV002-90PC.
How is end-of-program detection implemented in the AT49LV002-90PC?
The AT49LV002-90PC provides two hardware-supported methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and Toggle Bit (I/O6 toggles between 0 and 1 during programming/erase). Both mechanisms allow the host MCU to detect completion without fixed delays, enabling efficient use of the AT49LV002-90PC in real-time systems.
What package type and pin count does the AT49LV002-90PC use?
The AT49LV002-90PC is packaged in a 32-pin Plastic Dual In-line Package (PDIP), 0.600" wide (package code 32P6). It shares identical pinout and electrical characteristics with other 32-pin variants like AT49LV002-90JC (PLCC) and AT49LV002-90TC (TSOP), allowing board-level interchangeability where mechanical constraints permit.
Can the AT49LV002-90PC be used as a direct replacement for standard EPROMs like the 27C256?
Yes-the AT49LV002-90PC features identical CE/OE/WE control logic, pin-compatible 32-pin DIP footprint, and EPROM-like read timing (90 ns access), enabling drop-in replacement for 27C256 (32K × 8) in many designs. However, note that the AT49LV002-90PC is 256K × 8 (2 Mbit), offering 8× more capacity, and requires command-based programming rather than UV erasure.
AT49LV002-90PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49LV002-90PC FAQ
1.How can I place an order for AT49LV002-90PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002-90PC 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 AT49LV002-90PC reliable?
The price and inventory of AT49LV002-90PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002-90PC is usually 5 days.
3.What payment methods are accepted for AT49LV002-90PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002-90PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002-90PC?
AT49LV002-90PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002-90PC 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 AT49LV002-90PC?
For technical support, including AT49LV002-90PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002-90PC requirements.
6.How does Aetrix verify that AT49LV002-90PC is sourced from the original manufacturer or authorized distributors?
All AT49LV002-90PC 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 AT49LV002-90PC meets industry standards.
7.What is the process for return or replacement of AT49LV002-90PC?
All AT49LV002-90PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002-90PC, 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 AT49LV002-90PC part is unused and in its original packaging.
Return procedure for AT49LV002-90PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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