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Microchip Technology AT49LV001NT-90JI
- Part No.:
- AT49LV001NT-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49LV001NT-90JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,332
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Product details
Overview
AT49LV001NT-90JI from Microchip Technology (formerly Atmel) is a 1 Mbit (128K × 8) single-supply 3.0–3.6 V in-system reprogrammable Flash memory IC with 90 ns read access time, sector-based erase architecture (16 KB boot block + two 8 KB parameter blocks + two main memory blocks), and hardware data protection. It serves as nonvolatile program/data storage in embedded microcontroller boot loaders and firmware update subsystems.
For engineers reviewing the AT49LV001NT-90JI datasheet, AT49LV001NT-90JI pinout, AT49LV001NT-90JI application, or AT49LV001NT-90JI equivalent, key selection considerations include industrial temperature range (−40°C to +85°C), PLCC-32 package compatibility, boot block programming lockout capability, byte-programming timing (30 µs typical), and DATA polling/Toggle Bit end-of-operation detection.
Technical Context
This device implements a standard parallel Flash interface with CE/OE/WE control logic, internal command register for erase/program operations, and sector-erase granularity enabling selective firmware updates without full chip erasure. Its architecture separates boot code (16 KB at 1C000H–1FFFFH) from parameter and main memory blocks to support secure boot and field-upgradable applications.
It features dual-mode operation: standard read mode (CE+OE low, WE high) and command-triggered programming/erasing via six-cycle sequences written to specific address/data locations. Hardware reset override (12 V on RESET) allows boot block reprogramming even when lockout is enabled - a capability confirmed for the AT49LV001NT variant per datasheet section "BOOT BLOCK PROGRAMMING LOCKOUT OVERRIDE".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits), organized as 128K words × 8 bits |
| Supply Voltage | 3.0 V to 3.6 V - enables direct integration with 3.3 V logic systems without level shifting |
| Read Access Time | 90 ns - determines maximum sustained read throughput in CPU instruction fetch or data lookup paths |
| Byte Programming Time | 30 µs typical - defines minimum interval between successive byte writes during firmware patching |
| Erase Cycle Time | 10 seconds max - sets worst-case latency for sector or chip erase before reprogramming |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed timing delays in host firmware |
| Write Endurance | 10,000 program/erase cycles - specifies usable lifetime under repeated field update conditions |
Pinout & Package
AT49LV001NT-90JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package with J-bend leads, suitable for surface-mount assembly and socketed prototyping. Pin 1 is index corner; pin 9 is NC (No Connect) per datasheet note.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing (00000H–1FFFFH) |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface for read data output and program data input |
| CE | Chip Enable | Active-low chip select; must be low with OE low for valid read access |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low signal initiating byte programming, sector erase, or command loading |
| RESET | Reset Input | Active-low reset; 12 V override enables boot block reprogramming despite lockout |
| VCC | Power Supply | +3.0 V to +3.6 V supply; powers core logic and I/O buffers |
| GND | Ground | Reference return path for all signals and power |
| NC | No Connect | Pin 9 - must remain unconnected per datasheet specification |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16 KB protected region (1C000H–1FFFFH) prevents accidental overwrite of boot code; lockout enabled via 6-cycle command sequence |
| Sector Erase Architecture | Independent erasure of two 8 KB parameter blocks and two main memory blocks (32 KB + 64 KB) enables granular firmware 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) |
| Industrial Temperature Range | −40°C to +85°C operation - validated for use in automotive ECUs, industrial controllers, and outdoor IoT gateways |
| Low Power Standby | 50 µA CMOS standby current - minimizes quiescent power in battery-backed or energy-sensitive systems |
Applications
| Embedded Boot Loader Storage | Firmware Update Module |
|---|---|
Use Scenario: Storing initial boot code executed by an MCU upon power-on reset in industrial PLCs. IC Role / Device Role / Timing Role: Nonvolatile storage for secure, tamper-resistant boot firmware; accessed via parallel bus during cold start. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates while allowing parameter block rewrites. |
Use Scenario: Field-upgradable firmware partition in medical diagnostic equipment requiring regulatory-compliant version rollback. IC Role / Device Role / Timing Role: In-system reprogrammable storage for application binaries; erased/reprogrammed via host MCU using DATA polling. Use Value: Sector erase enables updating only changed modules (e.g., UI layer), reducing update time vs. full chip erase. |
| Secure Parameter Configuration | Legacy System BIOS Replacement |
Use Scenario: Retaining calibrated sensor offsets and calibration coefficients across power cycles in test instrumentation. IC Role / Device Role / Timing Role: Persistent storage for critical configuration data; accessed via 90 ns read for real-time compensation lookups. Use Value: Two independent 8 KB parameter blocks allow A/B configuration sets for fail-safe switching without erasing active settings. |
Use Scenario: Replacing obsolete EPROM-based BIOS in legacy industrial HMIs where PCB layout cannot accommodate new packages. IC Role / Device Role / Timing Role: Drop-in parallel Flash replacement for 27C010-equivalent sockets; PLCC-32 footprint matches legacy designs. Use Value: Same pinout and 3.3 V compatibility eliminate board redesign; 90 ns access meets original timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF010-90-4C-NHE | 3.0–3.6 V supply, 90 ns access, 1 Mbit, PLCC-32, but lacks RESET pin and boot block lockout override | No 12 V RESET override; boot protection relies solely on software lock - less robust against corruption | Preferred where simplified command set and lower cost outweigh boot security requirements |
| MX29LV001CTTI-90G | 3.0–3.6 V, 90 ns, 1 Mbit, PLCC-32, includes CFI query support and wider voltage tolerance (2.7–3.6 V) | CFI compliance simplifies auto-detection in generic flash programmers; no dedicated RESET pin for boot override | Chosen when system-level flash abstraction layers require CFI-compliant devices |
Compared with SST39VF010-90-4C-NHE and MX29LV001CTTI-90G, the AT49LV001NT-90JI uniquely supports 12 V RESET-driven boot block reprogramming - a hardware-enforced recovery path absent in both alternatives - making it preferred for safety-critical boot storage where firmware resilience is mandatory.
Availability
AT49LV001NT-90JI is available at Aetrix Electronics and suitable for industrial control systems, medical device firmware storage, and legacy system upgrades requiring stable component supply with long-term lifecycle support.
Supply support for AT49LV001NT-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 its Flash memory portfolio, emphasizing reliability, longevity, and industrial-grade qualification for embedded applications.
The AT49LV001NT series belongs to Atmel's legacy parallel Flash product line, designed specifically for in-system reprogrammability in resource-constrained microcontroller-based systems requiring secure boot and field-upgradable firmware.
FAQ
What is the operating temperature range for the AT49LV001NT-90JI?
The AT49LV001NT-90JI is rated for industrial temperature operation from −40°C to +85°C, as confirmed in the "DC and AC Operating Range" table of the datasheet. This makes it suitable for deployment in harsh environments such as factory automation controllers and outdoor telemetry units where ambient thermal stress exceeds commercial grade limits.
Does the AT49LV001NT-90JI support boot block reprogramming after lockout is enabled?
Yes - the AT49LV001NT-90JI supports boot block reprogramming even after lockout is enabled, via application of 12.0 V ± 0.5 V to the RESET pin during erase or programming operations. This hardware override is explicitly documented for the AT49LV001NT variant and distinguishes it from the N(T) variants where RESET is DC-only.
What package type does the AT49LV001NT-90JI use?
The AT49LV001NT-90JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as "32J" in Atmel's ordering information. Pin 1 is the index corner, and pin 9 is marked NC (No Connect), consistent with the PLCC top-view diagram in the datasheet.
How is end-of-program detection implemented in the AT49LV001NT-90JI?
The AT49LV001NT-90JI provides two hardware-supported end-of-program detection methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and Toggle Bit (I/O6 toggles during operation and stabilizes upon completion). Both are usable concurrently and eliminate reliance on fixed timing delays in host firmware.
What is the memory organization and sector layout of the AT49LV001NT-90JI?
The AT49LV001NT-90JI organizes its 1 Mbit as 131,072 × 8 bits, with sector architecture comprising one 16 KB boot block (1C000H–1FFFFH), two 8 KB parameter blocks (1A000H–1BFFFH and 18000H–19FFFH), and two main memory blocks (10000H–17FFFH and 00000H–0FFFFH). This layout enables selective erasure for modular firmware updates.
AT49LV001NT-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:
- 1Mbit
- Memory Organization:
- 128K 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)
AT49LV001NT-90JI FAQ
1.How can I place an order for AT49LV001NT-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV001NT-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 AT49LV001NT-90JI reliable?
The price and inventory of AT49LV001NT-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV001NT-90JI is usually 5 days.
3.What payment methods are accepted for AT49LV001NT-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV001NT-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV001NT-90JI?
AT49LV001NT-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV001NT-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 AT49LV001NT-90JI?
For technical support, including AT49LV001NT-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV001NT-90JI requirements.
6.How does Aetrix verify that AT49LV001NT-90JI is sourced from the original manufacturer or authorized distributors?
All AT49LV001NT-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 AT49LV001NT-90JI meets industry standards.
7.What is the process for return or replacement of AT49LV001NT-90JI?
All AT49LV001NT-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV001NT-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 AT49LV001NT-90JI part is unused and in its original packaging.
Return procedure for AT49LV001NT-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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