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Microchip Technology AT49F001N-90JI
- Part No.:
- AT49F001N-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001N-90JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,572
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Product details
Overview
AT49F001N-90JI from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) 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 µs typical byte programming, 10-second chip erase, 16K-byte boot block with programmable lockout, and operates across –40°C to +85°C industrial temperature range.
For engineers reviewing the AT49F001N-90JI datasheet, AT49F001N-90JI pinout, AT49F001N-90JI application, or AT49F001N-90JI equivalent, this page provides verified technical context, sector architecture details, hardware data protection mechanisms, DC/AC timing specifications, and industrial-grade supply chain support - all specific to the PLCC-packaged AT49F001N-90JI variant.
Technical Context
The AT49F001N-90JI implements a sector-erasable Flash architecture with one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). Its command-based operation uses standard CE/OE/WE control lines and requires no external high-voltage programming supply.
It supports DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) for end-of-program/erase detection, integrates VCC sense (<3.8V inhibit), noise filtering (<15 ns pulse rejection), and hardware write inhibition via OE/CE/WE logic states - enabling robust in-circuit reprogramming in industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits); sufficient for firmware boot code and configuration data in 8-bit microcontroller systems. |
| Read Access Time | 90 ns max; enables direct execution from Flash (XIP) in timing-critical 5 MHz bus systems without wait states. |
| Byte Programming Time | 10 µs typical; allows rapid field updates of small data segments without full-block erasure overhead. |
| Chip Erase Time | 10 seconds max; deterministic internal timing eliminates need for external erase controllers or watchdog supervision. |
| Endurance | 10,000 program/erase cycles; validated for long-term reliability in industrial logging and calibration storage applications. |
| Operating Voltage | 5.0 V ±10%; single-supply compatibility simplifies power design versus mixed-voltage Flash alternatives. |
| Temperature Range | –40°C to +85°C; qualified for industrial control, automotive body electronics, and factory automation deployments. |
Pinout & Package
AT49F001N-90JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE. Pin 1 is marked by a corner notch; pins are numbered counterclockwise starting from the notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 131,072-word addressing; A0–A16 directly map to memory location selection during read/write cycles. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; enables bus contention avoidance in multi-device systems. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, allowing shared data bus operation. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence; controls entry into programming/erase modes. |
| I/O0–I/O7 | Data Input/Output | Bi-directional 8-bit data bus; carries command codes, program data, and read outputs; supports DATA polling on I/O7 and Toggle Bit on I/O6. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; not used for boot block override (unavailable on AT49F001N-90JI). |
| VCC | Power Supply | +5V ±10% supply; powers core logic and memory array; internal regulation ensures stable programming voltage independent of rail variation. |
| GND | Ground | Reference return path for all signals and power; decoupling at VCC/GND pair is required for reliable 90 ns timing compliance. |
| NC | No Connect | Pin 1 (PLCC); physically present but internally unconnected; must remain floating or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot block (00000H–03FFFH) can be permanently write-protected via command sequence, ensuring bootloader integrity during field firmware updates. |
| Hardware Data Protection | VCC sense (<3.8V disable), noise-filtered WE/CE inputs (<15 ns rejection), and triple-line inhibit (OE high / CE high / WE high) prevent accidental writes in electrically noisy environments. |
| Two End-of-Operation Detection Methods | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) provide software-flexible, bus-compatible status monitoring without requiring dedicated status registers. |
| Low Power Operation | 50 mA active current and 100 µA CMOS standby current enable use in battery-backed or energy-constrained industrial nodes. |
| Industrial Temperature Qualification | Rated for –40°C to +85°C operation with full AC/DC specification compliance, supporting deployment in motor drives, PLCs, and outdoor instrumentation. |
Applications
| Industrial PLC Firmware Storage | Embedded System Bootloader Memory |
|---|---|
|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in programmable logic controllers exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Nonvolatile code storage with 90 ns read access enabling real-time scan cycle execution; boot block lockout prevents corruption of safety-critical startup routines. Use Value: Eliminates need for external UV-EPROM programmers; in-system reprogramming reduces maintenance downtime and supports remote firmware patches. |
Use Scenario: Holding secure bootloader code in 8-bit microcontroller-based medical devices requiring regulatory-compliant firmware update capability. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector; 16K protected boot block ensures bootloader immutability while parameter blocks store calibration data. Use Value: Hardware-level write protection meets IEC 62304 software safety requirements; 10,000-cycle endurance supports lifetime device recalibration. |
| Automotive Body Control Module (BCM) | Factory Automation Sensor Node Configuration |
|
Use Scenario: Storing vehicle-specific lighting profiles, door lock logic, and CAN message routing tables in BCMs operating under engine bay thermal stress. IC Role / Device Role / Timing Role: Parameter storage element with dual 8K parameter blocks; sector-erasable architecture allows independent update of lighting vs. security settings. Use Value: 10-second erase time enables fast over-the-air (OTA) parameter updates; industrial temp rating ensures reliability at 85°C case temperature. |
Use Scenario: Retaining sensor calibration coefficients, communication protocol settings, and fault history logs in wireless industrial sensors deployed in harsh manufacturing environments. IC Role / Device Role / Timing Role: Persistent configuration memory interfaced via parallel bus; low 100 µA standby current extends battery life in energy-harvesting nodes. Use Value: Byte-programmable granularity permits efficient updates of individual calibration values without erasing full firmware image. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002N-90JI | 2 Mbit (256K × 8) density; identical 90 ns timing, PLCC package, and sector architecture; shares same command set and voltage specs. | Supports larger firmware images; requires updated address decoding for A17; boot block remains 16K but occupies 00000H–03FFFH. | Select when firmware size exceeds 128K bytes; pinout and interface are identical - no PCB change required. |
| SST39VF010-90-4C-NHE | 1 Mbit, 90 ns, 3.3V core (5V tolerant I/O); different command set; no boot block lockout; TSOP-32 package only. | Lacks hardware boot protection and industrial temp grade; requires level-shifting for 5V-only systems; not drop-in compatible. | Consider only if migrating to 3.3V system architecture; verify command compatibility and implement external write protection logic. |
Compared with AT49F001N-90JI, AT49F002N-90JI offers double capacity with zero interface changes, while SST39VF010 demands voltage redesign and forfeits boot security - making AT49F001N-90JI optimal for cost-sensitive, safety-aware 5V industrial designs.
Availability
AT49F001N-90JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded bootloader memory, and automotive body control module applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AT49F001N-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 the AT49F series. The company specializes in scalable, qualified semiconductor solutions for industrial, automotive, and aerospace markets.
The AT49F001N-90JI belongs to Atmel's 5V Flash memory product line, designed specifically for in-system reprogrammability in resource-constrained 8-bit microcontroller platforms where reliability, sector protection, and industrial temperature operation are mandatory.
FAQ
What is the memory organization and density of the AT49F001N-90JI?
The AT49F001N-90JI contains 1 Mbit (131,072 words × 8 bits) of Flash memory organized into a 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). This structure enables selective erasure and secure bootloader storage - a key feature of the AT49F001N-90JI architecture.
Does the AT49F001N-90JI support in-system programming without high voltage?
Yes, the AT49F001N-90JI supports full 5V-only in-system reprogramming. It requires no external 12V supply: all commands (read, byte program, sector erase, chip erase, boot lock) execute using standard 5V logic levels on CE, OE, WE, and address/data lines - a defining capability of the AT49F001N-90JI.
What is the function of the RESET pin on the AT49F001N-90JI?
On the AT49F001N-90JI, the RESET pin is an active-low input that halts ongoing operations and forces I/O pins into high-impedance state. Unlike some variants, it does not support 12V boot block override - that feature is explicitly unavailable on the AT49F001N-90JI per the datasheet.
How is end-of-program detection implemented in the AT49F001N-90JI?
The AT49F001N-90JI provides two hardware-supported methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and Toggle Bit (I/O6 toggles between 0 and 1 during operation, then stabilizes). Both are usable at any point during the AT49F001N-90JI program cycle.
Is the AT49F001N-90JI pin-compatible with other AT49F001x variants?
Yes - all AT49F001x variants (including AT49F001N-90JI, AT49F001-90JI, AT49F001T-90JI) share identical 32-pin PLCC pinouts, signal definitions, and command sets. Differences are limited to boot block address mapping (00000H–03FFFH for AT49F001N vs. 1C000H–1FFFFH for AT49F001T) and RESET functionality.
AT49F001N-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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F001N-90JI FAQ
1.How can I place an order for AT49F001N-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001N-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 AT49F001N-90JI reliable?
The price and inventory of AT49F001N-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001N-90JI is usually 5 days.
3.What payment methods are accepted for AT49F001N-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001N-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001N-90JI?
AT49F001N-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001N-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 AT49F001N-90JI?
For technical support, including AT49F001N-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001N-90JI requirements.
6.How does Aetrix verify that AT49F001N-90JI is sourced from the original manufacturer or authorized distributors?
All AT49F001N-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 AT49F001N-90JI meets industry standards.
7.What is the process for return or replacement of AT49F001N-90JI?
All AT49F001N-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001N-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 AT49F001N-90JI part is unused and in its original packaging.
Return procedure for AT49F001N-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001N-90JI Tags
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