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Microchip Technology AT49LV002N-90VC
- Part No.:
- AT49LV002N-90VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49LV002N-90VC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,358
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Product details
Overview
AT49LV002N-90VC 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 (30 µs/byte typical), and hardware data protection - enabling reliable firmware updates in industrial control panels and legacy instrumentation.
For engineers reviewing the AT49LV002N-90VC datasheet, AT49LV002N-90VC pinout, AT49LV002N-90VC application, or AT49LV002N-90VC equivalent, key selection criteria include its VSOP-32 package, boot block programming lockout feature, sector-based erase architecture (16K boot + two 8K parameter + two main memory blocks), and compatibility with standard EPROM-like CE/OE/WE bus interface timing.
Technical Context
This parallel-interface Flash memory implements a command-register architecture requiring six-byte software sequences for chip/sector erase and boot lockout enable. Its internal program control logic eliminates external high-voltage programming circuitry, supporting in-system reprogramming via standard 3.3 V I/O levels.
The device features dual erase modes: full-chip erase (10 s max) and sector-selectable erase targeting specific 8K parameter blocks or 96K/128K main memory blocks. Boot block protection is enforced by hardware lockout that persists after power cycle unless overridden with 12 V on RESET - though RESET is DC (no function) on the AT49LV002N-90VC variant per datasheet note.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized as 262,144 words × 8 bits - sufficient for bootloader + configuration data in 8-bit/16-bit MCU systems. |
| Read Access Time | 90 ns maximum - compatible with 11 MHz bus timing in legacy microcontrollers without wait states. |
| Supply Voltage | 3.0 V to 3.6 V only - requires stable 3.3 V rail; no 5 V tolerance or dual-voltage support. |
| Erase Cycle Time | 10 seconds typical for full chip erase - enables field firmware updates with predictable timeout handling. |
| Programming Speed | 30 µs/byte typical - supports incremental patching of small code/data segments without long blocking delays. |
| End-of-Write Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - allows host CPU to poll instead of fixed-timing waits. |
| Endurance | 10,000 write/erase cycles - suitable for infrequent firmware upgrades, not for logging or wear-leveling applications. |
| Standby Current | 50 µA CMOS standby - critical for battery-backed systems where quiescent power must be minimized. |
Pinout & Package
AT49LV002N-90VC uses a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm body, JEDEC MO-187AC compliant. Pin 1 is index corner; pin 9 is NC (No Connect) 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–A16 used for byte-level access within 8-bit data bus. |
| I/O0–I/O7 | Data Inputs/Outputs | 8-bit bidirectional data bus; true TTL-compatible outputs (VOH ≥ 2.4 V, VOL ≤ 0.45 V at specified loads). |
| CE | Chip Enable | Active-low chip select; when high, places outputs in high-impedance state - essential for multi-device bus sharing. |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention during read cycles without requiring WE assertion. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing; inhibits programming if held high. |
| RESET | Reset Input | DC (no function) on AT49LV002N-90VC - tied internally; not usable for boot override or reset synchronization. |
| VCC | Power Supply | 3.0–3.6 V supply input; decoupling capacitor required near pin to suppress switching noise during program/erase. |
| GND | Ground | Reference return path for all signals and power; separate ground plane recommended for noise immunity. |
| DC | No Connect | Pin 9 is unconnected - must be left floating or tied to GND per PCB layout best practice; no internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot block (00000H–03FFFH) supports permanent secure bootloader storage once lockout enabled - prevents accidental overwrite during field updates. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low / CE high / WE high blocks writes) - reduces risk of spurious reprogramming. |
| Standard EPROM-Compatible Interface | Uses CE/OE/WE three-control-line protocol identical to UV-EPROMs - simplifies migration from obsolete EPROM sockets without logic redesign. |
| DATA Polling & Toggle Bit Feedback | Real-time status reporting via I/O7 complement or I/O6 toggle eliminates need for fixed delay loops - improves system responsiveness and deterministic timing. |
| Low-Power Operation | 25 mA active current and 50 µA CMOS standby current - enables use in energy-constrained industrial nodes powered by 3.3 V LDOs or battery backups. |
Applications
| Industrial PLC Firmware Storage | Legacy Instrumentation Bootloader |
|---|---|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; provides 90 ns read access to meet real-time scan-cycle deadlines. Use Value: Enables remote firmware patches without hardware replacement; boot block lockout ensures bootloader integrity across 10,000+ update cycles. |
Use Scenario: Holding startup code and sensor initialization routines in benchtop test equipment requiring long-term reliability and field-upgradable features. IC Role / Device Role / Timing Role: EPROM drop-in replacement for legacy designs; operates from 3.3 V supply while maintaining pinout and timing compatibility. Use Value: Eliminates UV-EPROM erasers and programmers; reduces BOM cost and extends product lifecycle using modern Flash technology. |
| Embedded Controller Configuration Memory | Communications Module Parameter Storage |
Use Scenario: Retaining user-configurable settings (baud rate, I/O mapping, alarm thresholds) in standalone embedded controllers deployed in remote monitoring sites. IC Role / Device Role / Timing Role: Parameter block storage (two 8K sections) with independent sector erase - allows selective reconfiguration without disturbing main application code. Use Value: Supports zero-downtime parameter updates; 50 µA standby current preserves battery life in solar-powered telemetry units. |
Use Scenario: Storing protocol stacks and network credentials in RS-485/Modbus gateways where secure, tamper-resistant storage is required. IC Role / Device Role / Timing Role: Secure boot block (16K) stores cryptographic keys and boot validation logic; lockout prevents runtime corruption. Use Value: Meets basic functional security requirements for industrial comms; no external security IC needed for bootloader protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV002N-90VC | 2.7–3.6 V supply range; includes BV-series voltage flexibility but same 90 ns speed and VSOP-32 package. | Acceptable for designs already using 2.7 V minimum rails; otherwise identical functionality and pinout. | Select if wider supply tolerance is needed; verify VCC stability margins in target system. |
| SST39VF020-90-4C-NHE | 90 ns access, 2 Mbit, 3.0–3.6 V, TSOP-32 package; supports faster 55 µs byte-program time and 100,000 endurance cycles. | Higher endurance and faster programming suit frequent field updates; TSOP footprint differs from VSOP-32 (8×20 mm vs. 8×14 mm). | Choose for new designs requiring longer lifetime or higher update frequency; requires PCB layout change. |
Compared with AT49BV002N-90VC and SST39VF020-90-4C-NHE, the AT49LV002N-90VC offers tighter 3.0–3.6 V operation and proven legacy compatibility, while trading off endurance and programming speed for boot-block security and VSOP space savings.
Availability
AT49LV002N-90VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy instrumentation bootloader replacement, embedded controller configuration memory, and communications module parameter storage requiring stable component supply across extended product lifecycles.
Supply support for AT49LV002N-90VC 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 AT49LV002N-90VC belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for 3.3 V embedded systems needing EPROM-compatible nonvolatile storage with in-system reprogrammability and hardware write protection.
FAQ
What is the correct supply voltage range for AT49LV002N-90VC?
The AT49LV002N-90VC operates strictly within 3.0 V to 3.6 V. Unlike the BV-series variants, it does not support 2.7 V minimum operation. Supply below 3.0 V disables programming functions via internal VCC sense circuitry, and operation above 3.6 V risks damage per Absolute Maximum Ratings. Stable 3.3 V regulation with local 0.1 µF + 4.7 µF decoupling is required.
Does AT49LV002N-90VC support boot block programming lockout, and how is it enabled?
Yes, AT49LV002N-90VC supports boot block programming lockout for its 16K-byte sector (00000H–03FFFH). It is enabled via a six-cycle command sequence: load AAH at 5555H, 55H at 2AAAH, 80H at 5555H, then AAH/55H/40H at 5555H/2AAAH/5555H. Once activated, the boot block becomes permanently write-protected under normal 3.3 V operation.
What package type and pin count does AT49LV002N-90VC use?
AT49LV002N-90VC uses a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm body size, per JEDEC MO-187AC. Pin 9 is designated NC (No Connect) and must remain unconnected. The pinout matches other 32-pin variants (PLCC, PDIP, TSOP) except for physical dimensions and thermal characteristics.
Can AT49LV002N-90VC be used as a direct replacement for standard EPROMs like 27C256?
AT49LV002N-90VC is functionally compatible with 27C256 as a 256K × 8 device and shares the same CE/OE/WE control interface and address/data bus structure. However, it requires different programming algorithms and lacks UV-erasure - so it replaces EPROMs in systems with in-circuit programming capability, not in socketed UV-erasable designs.
What is the purpose of the RESET pin on AT49LV002N-90VC, and is it functional?
On AT49LV002N-90VC, the RESET pin is marked "DC" (Don't Connect) in the datasheet and has no internal functionality. It is not usable for reset synchronization or boot override - unlike some other variants (e.g., AT49LV002T) where RESET supports 12 V override. This pin must be left floating or tied to GND per layout guidelines.
AT49LV002N-90VC 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:
- 90 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49LV002N-90VC FAQ
1.How can I place an order for AT49LV002N-90VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002N-90VC 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-90VC reliable?
The price and inventory of AT49LV002N-90VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002N-90VC is usually 5 days.
3.What payment methods are accepted for AT49LV002N-90VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002N-90VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002N-90VC?
AT49LV002N-90VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002N-90VC 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-90VC?
For technical support, including AT49LV002N-90VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002N-90VC requirements.
6.How does Aetrix verify that AT49LV002N-90VC is sourced from the original manufacturer or authorized distributors?
All AT49LV002N-90VC 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-90VC meets industry standards.
7.What is the process for return or replacement of AT49LV002N-90VC?
All AT49LV002N-90VC units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002N-90VC, 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-90VC part is unused and in its original packaging.
Return procedure for AT49LV002N-90VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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