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Microchip Technology AT49LV002NT-12PI
- Part No.:
- AT49LV002NT-12PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49LV002NT-12PI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49LV002NT-12PI 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 120 ns read access time, 10-second chip erase, byte-programmable architecture with sector protection, and supports boot code retention via hardware lockout - deployed in industrial PLC firmware updates and legacy BIOS storage.
For engineers reviewing the AT49LV002NT-12PI datasheet, AT49LV002NT-12PI pinout, AT49LV002NT-12PI application, or AT49LV002NT-12PI equivalent, key selection criteria include its 3.0–3.6 V operation range, 120 ns read timing, PLCC-32 package compatibility, boot block lockout override via 12 V RESET, and sector-based erase flexibility across 16K/8K/96K/128K memory blocks.
Technical Context
This Flash memory implements a standard parallel interface with CE/OE/WE control logic, internal command register sequencing, and hardware-based data protection including VCC sense, noise filtering, and program inhibit. Its architecture separates memory into five distinct sectors: one 16K-byte boot block (address 3C000H–3FFFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes).
Operation modes include Read, Byte Program, Sector Erase, Chip Erase, and Software Product Identification - all initiated via six-cycle command sequences written to address 5555H/2AAAH. The device supports DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) for end-of-operation detection without external timing dependencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized as 262,144 words × 8 bits - sufficient for full firmware images in 8-bit/16-bit MCU systems. |
| Supply Voltage | 3.0 V to 3.6 V - compatible with 3.3 V logic rails and battery-backed industrial systems without level-shifting. |
| Read Access Time | 120 ns - meets timing requirements for 8 MHz Z80, 8051, and early ARM7 bus interfaces. |
| Erase Cycle Time | 10 seconds (chip-wide) - enables field firmware updates within deterministic maintenance windows. |
| Byte Programming Time | 30 µs typical - allows rapid patching of individual configuration registers or calibration tables. |
| End-of-Operation Detection | DATA polling (I/O7) and Toggle Bit (I/O6) - eliminates need for fixed delay timers in host firmware. |
| Write Endurance | 10,000 program/erase cycles - supports multi-year field update cycles in industrial controllers. |
| Standby Current | 50 µA CMOS - enables low-power retention in always-on embedded systems with battery backup. |
Pinout & Package
AT49LV002NT-12PI is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC-32) with J-leads, pin 1 index marked by corner notch. Pin 1 is NC (Not Connected) per datasheet Rev. 0982D–FLASH–02/03, Section 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for sector commands, A17 selects high/low bank in T-variant. |
| 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; enables tri-state buffer only when CE is also low - provides dual-line read gating per JEDEC standards. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges during command sequences - critical for reliable software-controlled erase/program. |
| RESET* | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V input overrides boot block lockout - unique to T-variant devices. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path; carries command codes, product ID, and user data - supports both hardware and software product identification modes. |
| VCC | Power Supply | +3.0 V to +3.6 V supply; internally regulated for stable programming voltage - eliminates need for external charge pumps. |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal logic - requires low-inductance connection to minimize read noise. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K-byte boot block (3C000H–3FFFFH) programmable lockout prevents accidental overwrite of bootloader code - essential for system reliability in unattended deployments. |
| 12 V RESET Override | Applying 12 V ± 0.5 V to RESET pin disables boot block protection during chip/sector erase or byte program - enables recovery without hardware rework. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filter (<15 ns pulses ignored), and control-line inhibit (OE low/CE high/WE high blocks writes) - reduces field failure risk in electrically noisy environments. |
| Software Command Sequencing | Standardized 6-cycle command protocol (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H) ensures interoperability across host MCU families without custom drivers. |
| DC and AC Characterization | Specified for commercial (0°C–70°C) and industrial (−40°C–85°C) ranges; tACC = 120 ns, ISB1 = 50 µA, ICC = 25 mA - validated for long-term deployment in harsh thermal profiles. |
Applications
| Industrial PLC Firmware Storage | Legacy BIOS/UEFI Code Retention |
|---|---|
Use Scenario: Storing and updating ladder logic firmware 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 in-system reprogrammability; 120 ns read timing aligns with 8 MHz bus clocks in Modbus RTU master controllers. Use Value: Boot block lockout preserves bootloader integrity during remote firmware upgrades, while sector erase enables selective parameter updates without full image reload. |
Use Scenario: Holding POST routines and hardware initialization code in legacy x86-based industrial motherboards where SPI Flash is unsupported. IC Role / Device Role / Timing Role: Parallel-interface Flash memory mapped into CPU address space; CE/OE/WE timing compliant with Intel 82380-compatible chipset buses. Use Value: 3.3 V-only operation eliminates level shifters; 10,000-cycle endurance supports decades of BIOS revision management in medical imaging equipment. |
| Embedded Microcontroller Bootloader | Telecom Line Card Configuration |
Use Scenario: Hosting secure boot code for 8051- or Z80-based telemetry modules in remote utility metering infrastructure. IC Role / Device Role / Timing Role: Primary boot memory accessed at power-on reset; RESET pin override enables field recovery if bootloader corruption occurs. Use Value: 12 V RESET override allows emergency reprogramming without board removal - critical for inaccessible installations on utility poles or substations. |
Use Scenario: Storing line-protection settings, gain calibration tables, and protocol stacks in T1/E1 line interface cards requiring frequent field tuning. IC Role / Device Role / Timing Role: Parameter storage with fast byte-write capability; sector architecture isolates calibration data from firmware updates. Use Value: Independent 8K-byte parameter blocks allow real-time adjustment of analog front-end coefficients without disrupting active call processing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49BV002NT-12PI | 2.7–3.6 V supply range; includes BV-series higher-voltage tolerance - wider margin for brown-out conditions. | Compatible pinout and command set; same PLCC-32 package and 120 ns timing - drop-in replacement where 2.7 V minimum operation is required. | Select when system VCC may dip below 3.0 V during startup or battery operation. |
| SST39VF020-120-4C-NHE | 3.0–3.6 V, 120 ns, 2 Mbit, PLCC-32; uses single 3.3 V supply but lacks 12 V RESET override and boot lockout override capability. | No hardware boot block protection override; relies on software-only lock mechanisms - less robust for safety-critical recovery. | Choose for cost-sensitive designs where boot recovery via external programmer is acceptable. |
Compared with AT49BV002NT-12PI and SST39VF020-120-4C-NHE, the AT49LV002NT-12PI offers stricter 3.0–3.6 V operation with guaranteed 12 V RESET override - enabling field-recoverable boot code in systems where voltage stability cannot be assured and external programming is impractical.
Availability
AT49LV002NT-12PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS code retention, and embedded microcontroller bootloader applications requiring stable component supply across extended lifecycle programs.
Supply support for AT49LV002NT-12PI 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 manufacturing, documentation, and technical assistance.
The AT49LV002NT series belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for reliable in-system reprogramming in 3.3 V embedded systems where firmware update integrity and field serviceability are critical.
FAQ
What is the function of the RESET pin on the AT49LV002NT-12PI?
The RESET pin on the AT49LV002NT-12PI is an active-low input that halts ongoing operations and places outputs in high-impedance state. Critically, applying 12 V ± 0.5 V to this pin overrides the boot block programming lockout feature - allowing reprogramming of the protected 16K-byte boot sector even after lockout has been enabled. This capability is exclusive to the "T" variant and is not available on N- or non-T versions.
Does the AT49LV002NT-12PI support both hardware and software product identification?
Yes, the AT49LV002NT-12PI supports both hardware and software product identification modes. Hardware mode uses specific voltage levels on A9 (12 V) and A0 (VIL/VIH) with CE/OE/WE asserted, while software mode uses command sequences (5555H/AAH → 2AAAH/55H → 5555H/90H) to read Manufacturer Code 1FH and Device Code 08H. Both methods confirm the exact part identity and are used by programmers and host firmware for algorithm selection.
How does the sector architecture of the AT49LV002NT-12PI improve firmware update reliability?
The AT49LV002NT-12PI's sector architecture divides memory into five independently erasable sections: one 16K-byte boot block (3C000H–3FFFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). This allows targeted erasure - for example, updating calibration data in a parameter block without affecting bootloader code in the boot block - reducing risk of system failure during partial firmware updates.
What are the valid operating temperature ranges for the AT49LV002NT-12PI?
The AT49LV002NT-12PI is specified for industrial temperature operation from −40°C to +85°C, as confirmed in the AT49LV002N(T) Ordering Information table (Page 17) and DC/AC Operating Range table (Page 7). This rating applies to all package variants including the PLCC-32 (32J) used in the -12PI suffix, making it suitable for deployment in outdoor telecom equipment and factory automation systems.
Can the AT49LV002NT-12PI be used as a direct replacement for the AT49LV002N-12PI?
No, the AT49LV002NT-12PI is not a direct replacement for the AT49LV002N-12PI. The "T" suffix denotes the presence of the 12 V RESET override feature and relocated boot block (3C000H–3FFFFH vs. 00000H–03FFFH in "N" variants). While pinout and command set are identical, firmware relying on the original boot block address or omitting RESET voltage handling will fail - requiring layout and software validation before substitution.
AT49LV002NT-12PI 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:
- 120 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49LV002NT-12PI FAQ
1.How can I place an order for AT49LV002NT-12PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV002NT-12PI 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 AT49LV002NT-12PI reliable?
The price and inventory of AT49LV002NT-12PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV002NT-12PI is usually 5 days.
3.What payment methods are accepted for AT49LV002NT-12PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV002NT-12PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV002NT-12PI?
AT49LV002NT-12PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV002NT-12PI 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 AT49LV002NT-12PI?
For technical support, including AT49LV002NT-12PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV002NT-12PI requirements.
6.How does Aetrix verify that AT49LV002NT-12PI is sourced from the original manufacturer or authorized distributors?
All AT49LV002NT-12PI 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 AT49LV002NT-12PI meets industry standards.
7.What is the process for return or replacement of AT49LV002NT-12PI?
All AT49LV002NT-12PI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV002NT-12PI, 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 AT49LV002NT-12PI part is unused and in its original packaging.
Return procedure for AT49LV002NT-12PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LV002NT-12PI Tags
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