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Microchip Technology AT49F002NT-90PI
- Part No.:
- AT49F002NT-90PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F002NT-90PI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,820
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Product details
Overview
AT49F002NT-90PI from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC with 90 ns read access time, 10 µs/byte typical programming time, and sector-based architecture including a 16K-byte boot block with programmable lockout. It operates across industrial temperature range (–40°C to +85°C) and supports hardware data protection, DATA polling, and toggle-bit erase/program status detection for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49F002NT-90PI datasheet, AT49F002NT-90PI pinout, AT49F002NT-90PI application, or AT49F002NT-90PI equivalent, this page delivers verified specifications, validated pin functions, confirmed sector erase behavior, real-world boot-block lockout implementation details, and direct alternative part comparisons - all grounded in Atmel's official documentation for the AT49F002NT variant.
Technical Context
The AT49F002NT-90PI implements a command-register-based architecture requiring six-bus-cycle sequences for chip/sector erase and boot-block lockout enablement. Its memory map is partitioned into one 16K-byte boot block (address 3C000H–3FFFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes), enabling selective firmware updates without full-chip erasure.
It uses standard EPROM-compatible control signals (CE/OE/WE) with TTL/CMOS-level compatibility, internal program timers eliminating external timing components, and dual-status detection (DATA polling on I/O7 and toggle-bit on I/O6) to confirm completion of byte programming or sector erase operations - all while maintaining 50 mA active current and 100 µA CMOS standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - directly replaces EPROMs in 8-bit bus systems without address decoding changes. |
| Read Access Time | 90 ns max - ensures compatibility with 11 MHz Z80, 8051, and similar microcontrollers using standard wait-state logic. |
| Byte Programming Time | 10 µs typical (50 µs max) - enables fast field firmware patching at system level without dedicated high-voltage programmers. |
| Erase Cycle Time | 10 seconds max for full chip or sector - supports in-system update workflows where downtime must be bounded and predictable. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and toggle-bit (I/O6 toggling) - eliminates need for fixed delay loops or external status monitoring circuitry. |
| Boot Block Protection | 16K-byte region (3C000H–3FFFFH) with lockout enabled via 6-cycle command sequence - secures bootloader code against accidental overwrite during application updates. |
| Operating Voltage | 5.0 V ±10% - single-supply operation simplifies power design and avoids charge-pump complexity found in multi-voltage Flash devices. |
Pinout & Package
AT49F002NT-90PI is supplied in a 32-pin, 0.600" wide plastic DIP (PDIP) package (package code P6), with 32P6 footprint. Pin 1 is index-marked; pin 9 is NC (no connect) per AT49F002N(T) specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for byte selection within 2 Mbit space. |
| CE | Chip Enable | Active-low chip select; when high, places outputs in high-impedance state - essential for bus sharing in multi-peripheral systems. |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during read cycles - enables interleaved memory/I/O access. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing - central to all programming/erase sequences. |
| I/O0–I/O7 | Data Input/Output | Bi-directional 8-bit data bus; carries command codes, addresses, and data during programming; returns manufacturer/device ID in product identification mode. |
| RESET | Reset Input | Active-low reset; halts ongoing program/erase and forces high-Z outputs - also accepts 12 V override to unlock boot block when lockout is enabled. |
| VCC | Power Supply | +5 V supply pin; internally regulated for programming voltage generation - no external VPP required. |
| GND | Ground | Signal and power reference plane; decoupling capacitor placement near this pin critical for noise immunity during erase/write transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | Enables secure bootloader storage (3C000H–3FFFFH) that survives field updates to application code in main memory blocks - critical for fail-safe firmware recovery. |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks writes) prevent spurious reprogramming in noisy industrial environments. |
| Single 5V Supply Operation | Eliminates need for external +12 V or +21 V programming voltages - allows in-circuit reprogramming using standard microcontroller GPIOs and minimal support circuitry. |
| DATA Polling & Toggle-Bit Status | Provides software-controllable, cycle-accurate confirmation of program/erase completion without external hardware - reduces firmware overhead and improves update reliability. |
| 10,000 Write/Erase Cycles | Guaranteed endurance supports long-term field deployment in applications requiring periodic firmware upgrades over 5+ year product lifecycles. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Stores boot firmware and configuration parameters in programmable logic controllers deployed in factory automation environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile program memory holding startup code executed by host MCU upon power-up; 90 ns access time aligns with 11–12 MHz industrial microcontrollers. Use Value: Sector erase capability allows updating application logic without disturbing validated bootloader, while hardware write protection prevents corruption during brown-out or ESD events. |
Use Scenario: Holds certified bootloader and calibration data in Class II medical instruments requiring regulatory-compliant firmware integrity and field-upgrade capability. IC Role / Device Role / Timing Role: Secure, lockable Flash memory providing tamper-resistant execution environment for safety-critical initialization routines prior to application runtime. Use Value: Boot block lockout (enabled via documented 6-cycle command) ensures FDA/IEC 62304 compliance by preventing unauthorized modification of certified startup code. |
| Automotive Diagnostic Module Code Storage | Telecom Edge Node Configuration Memory |
Use Scenario: Stores diagnostic firmware and vehicle-specific calibration tables in OBD-II modules operating across –40°C to +85°C ambient conditions. IC Role / Device Role / Timing Role: Industrial-grade Flash memory interfacing directly to 8-bit automotive MCUs via parallel bus; RESET pin supports 12 V override for service-mode reprogramming. Use Value: 10,000-cycle endurance and 10-second sector erase meet OEM requirements for 10-year field serviceability without hardware replacement. |
Use Scenario: Retains configuration profiles and protocol stacks in remote telecom node gateways requiring zero-touch provisioning and over-the-air updates. IC Role / Device Role / Timing Role: In-system reprogrammable memory supporting dual-bank update schemes - one block active while other is erased/reprogrammed. Use Value: Parameter block architecture (two 8K sections) enables atomic storage of network credentials and encryption keys separate from application firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-90EC | 3 V core with 5 V I/O tolerance; 90 ns access; 16K boot sector; no RESET pin override for boot lockout. | Requires level-shifting for pure 5 V systems; lacks 12 V RESET override for emergency boot-block reprogramming. | Select if migrating to lower-power 3 V systems; avoid if legacy 5 V bus and field-service boot unlock are required. |
| SST39VF020-90-4C-NHE | 3.3 V only; 90 ns access; 8K boot sector; no hardware RESET override; supports byte-write without pre-erase. | Not pin-compatible; incompatible voltage domain; smaller boot sector limits bootloader complexity. | Choose for cost-sensitive 3.3 V designs where boot security is less stringent; not suitable as drop-in replacement. |
Compared with AM29LV002BT-90EC and SST39VF020-90-4C-NHE, the AT49F002NT-90PI uniquely combines 5 V-only operation, 12 V RESET-based boot-block override, and industrial temperature rating - making it the only option among the three that supports robust in-field recovery of locked bootloader code in legacy 5 V embedded systems.
Availability
AT49F002NT-90PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, automotive diagnostic module code storage, telecom edge node configuration memory, and embedded system BIOS/parameter retention requiring stable component supply across extended lifecycle commitments.
Supply support for AT49F002NT-90PI 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor company specializing in microcontrollers, Flash memory, and mixed-signal ICs for industrial, automotive, and consumer applications.
The AT49F002NT series belongs to Atmel's 5V Flash memory product line, designed specifically for in-system reprogrammability in legacy 8-bit microcontroller platforms where simplicity, reliability, and field-upgrade capability are prioritized over ultra-low power or high-speed serial interfaces.
FAQ
What is the exact memory organization of the AT49F002NT-90PI?
The AT49F002NT-90PI contains 2 Mbit (262,144 × 8) of Flash memory, organized as 256K words × 8 bits. Its physical address space spans 00000H to 3FFFFH, with the boot block located at 3C000H–3FFFFH (16K bytes), two parameter blocks at 3A000H–3BFFFH and 38000H–39FFFH (each 8K bytes), and main memory blocks at 20000H–37FFFH (96K bytes) and 00000H–1FFFFH (128K bytes).
Does the AT49F002NT-90PI require high-voltage programming signals?
No, the AT49F002NT-90PI operates exclusively from a single 5 V supply and does not require external high-voltage programming signals. All programming and erase operations are initiated via standardized 4- to 6-cycle command sequences applied to the WE, CE, and OE pins using standard 5 V logic levels - eliminating the need for charge pumps or VPP generators.
How is boot block protection implemented and overridden on the AT49F002NT-90PI?
Boot block protection on the AT49F002NT-90PI is enabled via a documented 6-cycle command sequence writing AAH, 55H, 80H, AAH, 55H, and 40H to address 5555H. Once enabled, the 16K boot block (3C000H–3FFFFH) becomes permanently write-protected at ≤5.5 V. To override, apply 12.0 V ±0.5 V to the RESET pin - a feature absent in AT49F002N(T) variants.
What are the valid package and temperature options for the AT49F002NT-90PI?
The AT49F002NT-90PI is specified for industrial temperature operation (–40°C to +85°C) and packaged in a 32-pin PDIP (32P6). The "-90" suffix denotes 90 ns maximum read access time; "PI" indicates industrial-grade PDIP. Other packages (PLCC, TSOP, VSOP) exist for AT49F002NT but the -90PI variant is exclusively PDIP industrial.
Can the AT49F002NT-90PI be used as a direct replacement for EPROMs like the 27C256?
Yes, the AT49F002NT-90PI is pin-compatible with 27C256 EPROMs in 32-pin PDIP packages and uses identical CE/OE/WE control protocols for read operations. However, it requires command-based programming instead of UV erasure, and its 90 ns access time matches 27C256-12 variants - confirming functional equivalence in existing 8-bit bus designs with minor firmware adaptation for writes.
AT49F002NT-90PI 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:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49F002NT-90PI FAQ
1.How can I place an order for AT49F002NT-90PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002NT-90PI 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 AT49F002NT-90PI reliable?
The price and inventory of AT49F002NT-90PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002NT-90PI is usually 5 days.
3.What payment methods are accepted for AT49F002NT-90PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002NT-90PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002NT-90PI?
AT49F002NT-90PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002NT-90PI 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 AT49F002NT-90PI?
For technical support, including AT49F002NT-90PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002NT-90PI requirements.
6.How does Aetrix verify that AT49F002NT-90PI is sourced from the original manufacturer or authorized distributors?
All AT49F002NT-90PI 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 AT49F002NT-90PI meets industry standards.
7.What is the process for return or replacement of AT49F002NT-90PI?
All AT49F002NT-90PI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002NT-90PI, 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 AT49F002NT-90PI part is unused and in its original packaging.
Return procedure for AT49F002NT-90PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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