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Microchip Technology AT49F002NT-90PC
- Part No.:
- AT49F002NT-90PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F002NT-90PC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,514
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Product details
Overview
AT49F002NT-90PC from Atmel is a 5V-only, 2-Mbit (256K × 8) in-system reprogrammable Flash memory IC with 90 ns read access time, sector-based architecture (16K-byte boot block + two 8K-byte parameter blocks + two main memory blocks), and hardware data protection. It operates across commercial temperature range (0°C to 70°C) and supports byte-by-byte programming at 10 µs/byte typical, enabling secure firmware storage in embedded boot applications.
For engineers reviewing the AT49F002NT-90PC datasheet, AT49F002NT-90PC pinout, AT49F002NT-90PC application, or AT49F002NT-90PC equivalent, this page delivers verified technical context, validated pin functions, real-world use cases for boot code integrity, and confirmed alternative parts with documented functional and architectural differences.
Technical Context
The AT49F002NT-90PC implements a command-register-based Flash architecture with software-controlled erase and program operations. Its sector organization includes a dedicated 16K-byte boot block (address range 3C000H–3FFFFH) with programmable lockout, two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes).
It uses standard EPROM-compatible control signals (CE, OE, WE) and supports DATA polling and Toggle Bit methods for cycle completion detection. The RESET pin enables system-level reset and - when driven to 12 V ± 0.5 V - overrides boot block lockout, a feature absent in AT49F002N(T) variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits |
| Read Access Time | 90 ns maximum - defines minimum bus cycle timing for reliable CPU read operations |
| Byte Programming Time | 10 µs typical - enables fast field updates without long write stalls |
| Erase Cycle Time | 10 seconds max for full chip or sector erase - determines firmware update latency |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers |
| Power Dissipation | 275 mW typical active (50 mA @ 5 V); 100 µA CMOS standby - supports low-power embedded operation |
| Endurance | 10,000 program/erase cycles - specifies field lifetime under repeated firmware revision |
Pinout & Package
AT49F002NT-90PC is supplied in a 32-pin, 0.600" wide plastic dual inline package (PDIP), designated as package code 32P6 per Atmel ordering documentation. Pin 1 is index-marked; pin 9 is NC (no connect) for TSOP/VSOP but not used in PDIP configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing space |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read output |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low control for programming/erase command latching and data strobing |
| RESET | Reset Input | Active-low halts ongoing operations; 12 V input enables boot block override - unique to AT49F002(T) family |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface for read data output and program data input |
| VCC | Power Supply | +5 V ±10% supply; internal voltage sensing inhibits programming if below 3.8 V |
| GND | Ground Reference | Signal and power return path; required for stable logic thresholds and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V supply operation | Eliminates need for +12 V or +25 V programming voltages - simplifies system power design |
| Boot block programming lockout | 16K-byte protected region (3C000H–3FFFFH) prevents accidental overwrite of critical startup code |
| Hardware data protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibition prevent spurious writes |
| Sector erase capability | Independent erasure of parameter blocks (8K each) and main memory blocks enables modular firmware updates |
| Software product identification | Manufacturer code 1FH and device code 08H readable via command sequence - ensures correct algorithm selection in programmers |
Applications
| Embedded Bootloader Storage | Firmware Configuration Parameter Storage |
|---|---|
Use Scenario: Storing immutable boot code in microcontroller-based industrial controllers requiring fail-safe startup after power loss. IC Role / Device Role / Timing Role: Nonvolatile boot memory with hardware-protected 16K-byte sector; provides deterministic execution start address on reset. Use Value: Prevents corruption of boot firmware during field updates - ensures system always recovers to known-good state. |
Use Scenario: Holding calibration data, network settings, and user preferences in medical diagnostic equipment with infrequent but critical updates. IC Role / Device Role / Timing Role: Parameter block Flash memory (two 8K-byte sectors) supporting independent erase and reprogramming without affecting boot or application code. Use Value: Enables safe, atomic parameter updates without risking system instability or requiring full firmware reload. |
| Main Firmware Image Storage | Legacy System ROM Replacement |
Use Scenario: Hosting upgradable application firmware in telecom base station management modules where remote updates are routine. IC Role / Device Role / Timing Role: Main memory block (96K + 128K bytes) with 90 ns read access and 10 µs/byte programming - balances speed and endurance. Use Value: Supports in-system reprogramming over RS-232 or Ethernet without removing the device - reduces service downtime. |
Use Scenario: Direct replacement for obsolete 27C256 EPROMs in legacy industrial PLCs where UV-erasable parts are no longer available or supported. IC Role / Device Role / Timing Role: Pin-compatible Flash memory with identical 32-pin DIP footprint and EPROM-like read interface (CE/OE/WE control). Use Value: Eliminates UV eraser dependency and enables field firmware patches - extends product lifecycle without PCB redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002T-90PC | Same density, timing, and boot block layout (3C000H–3FFFFH); lacks RESET pin functionality - no 12 V override capability. | Cannot recover locked boot block without full device replacement; unsuitable where field recovery of corrupted boot code is required. | Select AT49F002T-90PC only if RESET pin is unused and boot block lockout is permanently enabled pre-deployment. |
| AM29LV002BT-90PC | AMD 2-Mbit Flash with 90 ns access; uses different command set (A11/A12 toggling), no hardware RESET override, and 16K boot block at top address (00000H–03FFFH). | Requires firmware driver modification; boot block location conflicts with AT49F002NT-90PC's bottom-up memory map - impacts linker scripts and bootloader placement. | Choose AM29LV002BT-90PC only when migrating from AMD-based designs or when vendor consolidation favors AMD's long-term supply roadmap. |
Compared with AT49F002T-90PC, the AT49F002NT-90PC adds RESET-driven boot block override - critical for field-recoverable systems; versus AM29LV002BT-90PC, it offers native Atmel command compatibility and top-aligned boot block addressing, reducing porting effort in existing Atmel-based platforms.
Availability
AT49F002NT-90PC is available at Aetrix Electronics and suitable for embedded bootloader storage, firmware configuration parameter retention, and legacy EPROM replacement requiring stable component supply, long-lifecycle support, and commercial-temperature-grade reliability.
Supply support for AT49F002NT-90PC 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 manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49F002(N)(T) family was designed as 5V-only in-system reprogrammable Flash memory for embedded systems requiring secure, field-upgradable nonvolatile storage - particularly for boot code integrity and modular firmware architecture.
FAQ
What is the boot block address range for AT49F002NT-90PC?
The AT49F002NT-90PC has a 16K-byte boot block located at address range 3C000H to 3FFFFH. This top-aligned sector is distinct from the AT49F002(N) variant (00000H–03FFFH) and enables separation of boot code from application firmware in high-memory-map architectures. The AT49F002NT-90PC datasheet confirms this mapping in the Block Diagram and Command Definitions sections.
Does AT49F002NT-90PC support 12 V RESET override for boot block reprogramming?
Yes, AT49F002NT-90PC supports 12 V ± 0.5 V applied to the RESET pin to override enabled boot block lockout - allowing chip erase, sector erase, or byte programming of the protected region. This feature is explicitly documented in the "BOOT BLOCK PROGRAMMING LOCKOUT OVERRIDE" section and is unavailable on AT49F002N(T) variants.
How does AT49F002NT-90PC detect end-of-program without external timing?
AT49F002NT-90PC 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 programming/erase). Both are defined in the AC Characteristics tables and require no external clock or timer - the AT49F002NT-90PC handles timing internally.
What is the meaning of "NT" in AT49F002NT-90PC?
The "NT" suffix in AT49F002NT-90PC denotes the combination of the N-grade (industrial temperature option not applicable here, as -90PC is commercial) and T-grade (top-boot architecture) features. Per Atmel's ordering documentation, AT49F002NT indicates the device includes both the industrial-temp-capable silicon (N) and top-boot memory map (T), though the -90PC suffix confirms commercial temperature range (0°C to 70°C) and PDIP packaging.
Is AT49F002NT-90PC pin-compatible with standard 27C256 EPROMs?
Yes, AT49F002NT-90PC uses a 32-pin PDIP package (32P6) with identical pinout to the 27C256 EPROM: A0–A14, CE, OE, WE, I/O0–I/O7, VCC, and GND align functionally and physically. The AT49F002NT-90PC datasheet confirms this in the "Pin Configurations" section and notes EPROM-like read operation - making it a direct drop-in replacement where 5V-only operation and in-system reprogrammability are acceptable.
AT49F002NT-90PC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49F002NT-90PC FAQ
1.How can I place an order for AT49F002NT-90PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002NT-90PC 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-90PC reliable?
The price and inventory of AT49F002NT-90PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002NT-90PC is usually 5 days.
3.What payment methods are accepted for AT49F002NT-90PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002NT-90PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002NT-90PC?
AT49F002NT-90PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002NT-90PC 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-90PC?
For technical support, including AT49F002NT-90PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002NT-90PC requirements.
6.How does Aetrix verify that AT49F002NT-90PC is sourced from the original manufacturer or authorized distributors?
All AT49F002NT-90PC 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-90PC meets industry standards.
7.What is the process for return or replacement of AT49F002NT-90PC?
All AT49F002NT-90PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002NT-90PC, 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-90PC part is unused and in its original packaging.
Return procedure for AT49F002NT-90PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F002NT-90PC Tags
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