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Microchip Technology AT49LV002N-90PC
- Part No.:
- AT49LV002N-90PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49LV002N-90PC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,446
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Product details
Overview
AT49LV002N-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 and data storage in embedded microcontroller systems. It delivers 70 ns read access time, 10-second chip erase, byte-programmable operation at 30 µs/byte, and hardware data protection - enabling secure boot code retention in industrial control firmware updates.
For engineers reviewing the AT49LV002N-90PC datasheet, AT49LV002N-90PC pinout, AT49LV002N-90PC application, or AT49LV002N-90PC equivalent, key selection criteria include its 32-pin PDIP package, sector-protected boot block (16 KB), CMOS standby current of 50 µA, and compatibility with standard microprocessor bus timing without high-voltage programming.
Technical Context
The AT49LV002N-90PC implements a sector-erasable Flash architecture with one 16 KB boot block (address 00000H–03FFFH), two 8 KB parameter blocks, and two main memory blocks (96 KB and 128 KB). It uses standard CE/OE/WE control logic identical to EPROMs, supporting seamless integration into legacy 8-bit bus systems.
Its internal program control logic eliminates external high-voltage requirements: all operations - read, byte program, sector erase, and chip erase - are initiated via six-cycle command sequences using only VCC-level signals. DATA polling (I/O7 complement) and Toggle Bit (I/O6) provide real-time cycle completion detection without external timing dependencies.
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 Z80 or 8051-based systems without wait states. |
| Supply Voltage | 3.0 V to 3.6 V - single 3.3 V rail operation eliminates need for dual-voltage regulators. |
| Active Current | 25 mA typical - enables low-power operation during firmware reads in battery-backed applications. |
| Standby Current | 50 µA CMOS - reduces quiescent power in always-on industrial controllers. |
| Erase Time | 10 seconds max for full chip erase - enables predictable field firmware update windows. |
| Program End Detection | DATA polling (I/O7) and Toggle Bit (I/O6) - allows host MCU to poll asynchronously without fixed delays. |
Pinout & Package
AT49LV002N-90PC is supplied in a 32-lead, 0.600" wide plastic dual in-line package (PDIP), pin-compatible with industry-standard 27C256 EPROM footprints. Pin 1 is NC (no connect); RESET is DC (not functional on N-suffix variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A14 used for sector commands. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and 68K microcontrollers. |
| 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; enables high-impedance state when high to prevent bus contention. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming. |
| VCC | Power Supply | +3.0 V to +3.6 V supply; internally regulated for stable programming voltage generation. |
| GND | Ground Reference | Signal and power ground reference; decoupling capacitor required within 1 cm of VCC pin. |
| RESET | Reset Input | DC (no connect) on AT49LV002N-90PC - not functional; differs from T-suffix versions with 12 V override capability. |
| DC | No Connect | Pin 1 is unconnected; must remain floating or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16 KB protected region (00000H–03FFFH) prevents accidental overwrite of bootloader code once enabled via command sequence. |
| Sector Erase Flexibility | Independent erasure of two 8 KB parameter blocks and two main memory blocks enables modular firmware updates without full chip erase. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and CE/OE/WE interlock prevent spurious writes. |
| Standard Microprocessor Timing | Compatible with 8051, Z80, and 68K bus cycles - no custom timing generators or glue logic required. |
| Product Identification Mode | Hardware/software entry yields Manufacturer Code 1FH and Device Code 07H - enables automatic algorithm selection in universal programmers. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Retention |
|---|---|
Use Scenario: Storing firmware and configuration parameters 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 IC providing fast 90 ns read access and sector-locked boot code to ensure deterministic startup after power loss. Use Value: 50 µA standby current extends battery backup runtime; 10,000 write cycles support multi-year field firmware revision cycles. | Use Scenario: Securing certified bootloader code in Class II medical devices where regulatory compliance requires immutable startup routines. IC Role / Device Role / Timing Role: Flash memory IC with hardware-enforced boot block lockout preventing unauthorized modification of FDA-approved initialization sequences. Use Value: Boot block protection activated via documented command sequence ensures tamper-resistant integrity without external security ICs. |
| Automotive Diagnostic Tool Memory | Legacy Industrial HMI Code Storage |
Use Scenario: Holding diagnostic protocol stacks and vehicle-specific calibration tables in handheld OBD-II scanners deployed across automotive repair shops. IC Role / Device Role / Timing Role: In-system reprogrammable Flash IC enabling over-the-air or USB-based firmware updates without removing the device from the PCB. Use Value: Byte-programmable architecture allows patch-level updates; 3.0–3.6 V operation matches automotive 3.3 V supply rails. | Use Scenario: Replacing obsolete 27C256 EPROMs in aging human-machine interface panels running DOS-based control software. IC Role / Device Role / Timing Role: Drop-in EPROM-compatible Flash memory IC with identical PDIP-32 footprint and CE/OE/WE timing. Use Value: Eliminates UV eraser dependency and enables field firmware patches; 90 ns access meets original design timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV002N-90PC | 2.7–3.6 V supply range; includes BV-series higher-voltage tolerance. | Supports wider input voltage margin - suitable for systems with unstable 3.3 V rails or mixed 3.3/5 V board designs. | Select when board-level VCC regulation is marginal or shared with 5 V peripherals. |
| SST39VF200A-90-4C-NHE | 3.0–3.6 V supply; 90 ns access; 2 Mbit density; supports both byte and word programming. | Lacks dedicated boot block lockout; uses uniform 4 KB sector architecture instead of asymmetric block layout. | Choose when modular firmware partitioning is unnecessary and cost-per-bit optimization is prioritized. |
Compared with AT49BV002N-90PC and SST39VF200A-90-4C-NHE, the AT49LV002N-90PC offers tighter 3.0–3.6 V operation and guaranteed boot block protection - critical for safety-critical embedded boot paths where code immutability is mandated.
Availability
AT49LV002N-90PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader retention, and legacy HMI code storage requiring stable component supply across extended product lifecycles.
Supply support for AT49LV002N-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 products including the AT49LV series.
The AT49LV002N-90PC belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for reliable in-system reprogramming in space-constrained, low-power embedded systems using standard 3.3 V logic rails.
FAQ
What is the maximum operating temperature range for the AT49LV002N-90PC?
The AT49LV002N-90PC is rated for commercial temperature operation from 0°C to +70°C. Its datasheet specifies this range explicitly in the ordering information table for the -90PC suffix, and it does not support industrial (-40°C to +85°C) operation - unlike the -90PI variant.
Does the AT49LV002N-90PC support hardware reset functionality?
No, the AT49LV002N-90PC does not support hardware reset functionality. Pin 9 (RESET) is designated as DC (don't connect) for the N-suffix variants, including AT49LV002N-90PC. This differs from T-suffix versions which implement 12 V override capability on RESET for boot block reprogramming.
How is boot block protection enabled on the AT49LV002N-90PC?
Boot block protection on the AT49LV002N-90PC is enabled by executing a six-cycle command sequence: load AAH at 5555H, 55H at 2AAAH, 80H at 5555H, then AAH at 5555H, 55H at 2AAAH, and 40H at 5555H. Once activated, the 16 KB boot block (00000H–03FFFH) becomes permanently write-protected under 5.5 V.
Can the AT49LV002N-90PC be used as a direct replacement for the 27C256 EPROM?
Yes, the AT49LV002N-90PC is pin- and function-compatible with the 27C256 EPROM in PDIP-32 packages. It uses identical CE/OE/WE control logic and 90 ns access time, allowing drop-in replacement without PCB changes - though firmware must be adapted to support Flash-specific erase/program command sequences.
What is the endurance rating of the AT49LV002N-90PC?
The AT49LV002N-90PC is rated for a minimum of 10,000 program/erase cycles per memory location. This endurance specification is confirmed in the device description section and applies uniformly across all sectors including boot, parameter, and main memory blocks.
AT49LV002N-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
AT49LV002N-90PC FAQ
1.How can I place an order for AT49LV002N-90PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002N-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 AT49LV002N-90PC reliable?
The price and inventory of AT49LV002N-90PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002N-90PC is usually 5 days.
3.What payment methods are accepted for AT49LV002N-90PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002N-90PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002N-90PC?
AT49LV002N-90PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002N-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 AT49LV002N-90PC?
For technical support, including AT49LV002N-90PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002N-90PC requirements.
6.How does Aetrix verify that AT49LV002N-90PC is sourced from the original manufacturer or authorized distributors?
All AT49LV002N-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 AT49LV002N-90PC meets industry standards.
7.What is the process for return or replacement of AT49LV002N-90PC?
All AT49LV002N-90PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002N-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 AT49LV002N-90PC part is unused and in its original packaging.
Return procedure for AT49LV002N-90PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LV002N-90PC Tags
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