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Microchip Technology AT49LV001T-90JI
- Part No.:
- AT49LV001T-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49LV001T-90JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,936
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Product details
Overview
AT49LV001T-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 used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 90 ns read access time, 10-second chip erase, byte-programmable operation (30 µs/byte typical), sector-based architecture with boot-block protection, and operates across -40°C to +85°C industrial temperature range.
For engineers reviewing the AT49LV001T-90JI datasheet, AT49LV001T-90JI pinout, AT49LV001T-90JI application, or AT49LV001T-90JI equivalent, this page provides verified technical context, package-specific pin functions, real-world use cases in firmware storage and configuration retention, and validated alternative parts with documented functional and architectural differences.
Technical Context
The AT49LV001T-90JI implements a standard parallel Flash interface with CE/OE/WE control logic and supports hardware reset-driven boot-block reprogramming override at 12 V. Its internal command register executes software-controlled erase and program operations without external high-voltage circuitry.
Memory organization comprises one 16-Kbyte boot block (address 1C000H–1FFFFH), two 8-Kbyte parameter blocks, and two main memory blocks (32K and 64K bytes). Boot block lockout is enabled via six-cycle command sequence and persists under ≤5.5 V; override requires RESET pin driven to 12 V ± 0.5 V during operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits) - sufficient for bootloader, firmware image, or configuration tables in 8-bit/16-bit MCU systems |
| Read Access Time | 90 ns - enables direct execution from Flash (XIP) in timing-critical embedded applications |
| Supply Voltage | 3.0 V to 3.6 V - compatible with 3.3 V system rails; no 5 V support required |
| Erase Cycle Time | 10 seconds (full chip) - deterministic erase duration simplifies firmware update state machine design |
| Program Speed | 30 µs/byte typical - allows rapid field updates of small configuration segments without long delays |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed-timing delays in host firmware |
| Endurance | 10,000 write/erase cycles - suitable for infrequent firmware upgrades and persistent parameter logging |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded controllers and automotive body electronics |
Pinout & Package
AT49LV001T-90JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package with J-bend leads, pin-compatible with industry-standard 32-pin PLCC sockets and PCB footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A16 enables access beyond 64K boundary |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read, program, and identification modes; TTL-compatible I/O levels |
| 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; used with CE to prevent bus contention during shared-memory access |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing |
| RESET | Hardware Reset Input | Active-low reset; 12 V override capability enables boot-block reprogramming after lockout activation |
| VCC | Power Supply | 3.0–3.6 V supply; internal voltage regulation ensures stable core operation across rail tolerance |
| GND | Ground Reference | Signal and power ground return; decoupling capacitor placement critical for noise immunity during programming |
| DC / NC | No Connect / Don't Connect | Pin 1 (PLCC top view) is DC - must remain unconnected; not usable as signal or bypass |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block | 16-Kbyte boot block (1C000H–1FFFFH) supports secure bootloader storage; lockout prevents accidental overwrite during field updates |
| Single 3.3 V Supply Operation | Eliminates need for charge pumps or dual-rail regulators - reduces BOM count and layout complexity in 3.3 V systems |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock prevent spurious writes |
| DATA Polling & Toggle Bit | Two independent, software-readable status mechanisms allow robust, timing-agnostic host firmware control of erase/program completion |
| 12 V RESET Override | Enables recovery of locked boot block without device replacement - critical for field-deployed systems requiring firmware rollback |
| Industrial Temperature Range | Qualified from -40°C to +85°C - supports deployment in harsh environments including factory automation and transportation electronics |
Applications
| Firmware Storage | Configuration Retention |
|---|---|
Use Scenario: Storing boot code and application firmware for 8-bit microcontrollers in industrial PLCs where power loss during update must not corrupt startup logic. IC Role / Device Role / Timing Role: Nonvolatile parallel memory mapped into MCU address space; accessed via standard bus cycles with CE/OE/WE handshaking. Use Value: Boot block lockout ensures bootloader integrity; 90 ns access enables zero-wait-state XIP execution in timing-constrained control loops. |
Use Scenario: Preserving calibration data, user preferences, and network settings across power cycles in smart HVAC controllers. IC Role / Device Role / Timing Role: Parameter block (8-Kbyte ×2) serves as dedicated, fast-erasing NV storage region isolated from main firmware updates. Use Value: Independent sector erase allows parameter updates without erasing full firmware image - reducing update time and wear on main memory blocks. |
| Field Firmware Upgrade | Secure Bootloader Storage |
Use Scenario: Remote over-the-air (OTA) firmware patching in connected gateways where reliability and rollback capability are mandatory. IC Role / Device Role / Timing Role: Host processor executes software command sequences to erase target sectors and reprogram updated code sections. Use Value: 10,000-cycle endurance and 10-second erase guarantee long-term field serviceability; 12 V RESET override enables emergency boot-block recovery. |
Use Scenario: Protecting cryptographic keys and secure boot verification routines in medical device controllers subject to regulatory audit. IC Role / Device Role / Timing Role: Boot block (16-Kbyte) stores immutable secure boot ROM; lockout activated post-production to prevent tampering. Use Value: Hardware-enforced write protection meets IEC 62304 and ISO 13485 requirements for firmware integrity and traceability. |
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 density, but uses different command set and lacks 12 V RESET override | No hardware boot-block recovery path; relies solely on software lock mechanisms vulnerable to corruption | Select when command-set compatibility with existing SST39VF firmware drivers is required and boot-block override is unnecessary |
| MX29LV001CTTI-90G | Same 3.0–3.6 V supply and 90 ns timing, but boot block located at 00000H–03FFFH (not 1C000H–1FFFFH); no 12 V RESET feature | Boot block address mismatch prevents drop-in replacement; requires PCB-level address decoding changes | Select only if legacy board design already uses MX29LV001C footprint and boot block location aligns with system memory map |
Compared with SST39VF010-90-4C-NHE and MX29LV001CTTI-90G, the AT49LV001T-90JI uniquely combines industrial temperature rating, verified 12 V RESET override for boot-block recovery, and boot block positioned at top of address space (1C000H–1FFFFH), enabling clean separation from main firmware in memory-constrained systems.
Availability
AT49LV001T-90JI is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed availability through extended product discontinuation windows.
Supply support for AT49LV001T-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 full support for legacy Atmel Flash products, including manufacturing, documentation, and technical assistance.
The AT49LV001T-90JI belongs to Atmel's Battery-Voltage™ Flash memory family, designed specifically for reliable, low-voltage in-system reprogramming in resource-constrained embedded systems where firmware integrity and field upgradeability are critical.
FAQ
What is the correct boot block address range for AT49LV001T-90JI?
The AT49LV001T-90JI boot block occupies addresses 1C000H to 1FFFFH (16 Kbytes), distinct from non-T variants that use 00000H–03FFFH. This top-aligned mapping avoids overlap with typical MCU vector tables and simplifies memory partitioning in systems with limited address space.
Does AT49LV001T-90JI support 5 V operation?
No, AT49LV001T-90JI is strictly a 3.0–3.6 V device. It does not tolerate 5 V on any pin except RESET during override mode (12 V ± 0.5 V). Applying 5 V to VCC, I/O, or control pins violates absolute maximum ratings and may cause permanent damage.
How is boot block lockout disabled or overridden on AT49LV001T-90JI?
Once enabled, boot block lockout cannot be disabled via software. However, AT49LV001T-90JI supports hardware override: applying 12 V ± 0.5 V to the RESET pin during chip erase, sector erase, or byte program operations temporarily disables lockout, allowing boot block reprogramming.
What package type is used for AT49LV001T-90JI?
AT49LV001T-90JI is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC) with J-bend leads (package code 32J). It is socket-compatible with standard 32-pin PLCC sockets and matches the footprint of other AT49BV/LV001(N)(T) variants in PLCC form.
Can AT49LV001T-90JI be used in place of AT49LV001-90JI?
No - AT49LV001T-90JI and AT49LV001-90JI differ in boot block location (1C000H–1FFFFH vs. 00000H–03FFFH) and sector address mapping. Substituting them requires firmware and hardware address decoding changes; they are not functionally interchangeable without system-level validation.
AT49LV001T-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)
AT49LV001T-90JI FAQ
1.How can I place an order for AT49LV001T-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV001T-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 AT49LV001T-90JI reliable?
The price and inventory of AT49LV001T-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV001T-90JI is usually 5 days.
3.What payment methods are accepted for AT49LV001T-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV001T-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV001T-90JI?
AT49LV001T-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV001T-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 AT49LV001T-90JI?
For technical support, including AT49LV001T-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV001T-90JI requirements.
6.How does Aetrix verify that AT49LV001T-90JI is sourced from the original manufacturer or authorized distributors?
All AT49LV001T-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 AT49LV001T-90JI meets industry standards.
7.What is the process for return or replacement of AT49LV001T-90JI?
All AT49LV001T-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV001T-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 AT49LV001T-90JI part is unused and in its original packaging.
Return procedure for AT49LV001T-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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