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Microchip Technology AT49F002N-90PI
- Part No.:
- AT49F002N-90PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F002N-90PI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,556
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Product details
Overview
AT49F002N-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 hardware lockout. It operates across commercial temperature range (0°C to 70°C) and supports standard CE/OE/WE control for EPROM-compatible read and byte-programming operations in embedded firmware storage applications.
For engineers reviewing the AT49F002N-90PI datasheet, AT49F002N-90PI pinout, AT49F002N-90PI application, or AT49F002N-90PI equivalent, key selection criteria include boot-block protection capability, 5V-only reprogramming compatibility, 90 ns read timing compliance, sector erase granularity, and PDIP-32 package suitability for legacy board layouts and in-circuit programming fixtures.
Technical Context
The AT49F002N-90PI implements a command-register-based architecture requiring six-byte software sequences for chip/sector erase and boot-lock enable, with internal timing eliminating external clocks. Its memory map divides into one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K/128K bytes), all accessible via A0–A17 address lines.
Hardware data protection includes VCC sense (<3.8V inhibits programming), noise filtering on WE/CE (<15 ns pulses ignored), and dual-line control (CE+OE low for read). DATA polling (I/O7 complement) and toggle-bit (I/O6) mechanisms provide real-time program/erase cycle status without interrupt overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - supports full firmware image storage in 8-bit bus systems. |
| Read Access Time | 90 ns max - meets timing requirements for 11 MHz bus operation with standard microprocessor wait-state logic. |
| Byte Programming Time | 10 µs typical - enables rapid field updates of configuration parameters or patch code without system downtime. |
| Erase Cycle Time | 10 seconds max - allows full-chip or sector-level erasure within predictable maintenance windows. |
| Endurance | 10,000 write/erase cycles - ensures long-term reliability for applications requiring frequent firmware revision. |
| Power Dissipation | 50 mA active / 100 µA CMOS standby - suitable for low-power embedded controllers with battery backup or sleep modes. |
| Operating Voltage | 5.0 V ±10% - eliminates need for auxiliary high-voltage programming supplies; compatible with legacy 5V logic families. |
Pinout & Package
AT49F002N-90PI uses a 32-pin PDIP (32P6) package with 0.600" width, RoHS-compliant lead finish, and through-hole mounting. Pin 1 is index-marked; pins 1 and 32 are VCC and GND respectively. Pin 9 is NC (No Connect) per datasheet Rev. 1017D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A15 used for byte selection within 64K pages. |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; high-impedance when CE or OE is high to prevent bus contention. |
| 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; enables data drivers only when CE is also low - provides dual-line bus arbitration. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming cycles. |
| RESET | Reset Input | Active-low reset halts ongoing operations and forces outputs to high-Z; not used for boot-lock override (unavailable on N variant). |
| GND | Ground Reference | Signal and power return path; decoupling capacitor required within 10 mm of pin 16 per layout guidelines. |
| VCC | Power Supply | +5.0 V ±10% supply; requires 0.1 µF ceramic + 4.7 µF tantalum bypassing at pin 32 per datasheet recommendations. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K-byte boot block (00000H–03FFFH) supports permanent firmware lockdown via command sequence - prevents accidental corruption of bootloader code. |
| 5V-Only Reprogrammability | No external 12V programming voltage required; all commands executed using standard 5V logic levels - simplifies system power design and eliminates HV charge pumps. |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggling provide asynchronous, non-interrupting end-of-program detection - avoids polling delays and enables deterministic firmware update sequencing. |
| Hardware Data Protection | VCC sense, noise filtering, and CE/OE/WE interlock prevent spurious writes during power transients or EMI events - critical for industrial control environments. |
| Standard Microprocessor Interface | CE/OE/WE timing compliant with 8051, Z80, and 68K families - enables drop-in replacement of EPROMs without bus controller redesign. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Memory |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers subject to factory-floor EMI and thermal cycling. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding initialization code and runtime firmware; accessed at power-up and during online firmware upgrades. Use Value: 10,000-cycle endurance and hardware lockout ensure bootloader integrity over 10+ years of field operation without recalibration or service intervention. | Use Scenario: Replacing UV-erasable EPROMs in aging medical device controllers where board space and socket compatibility are constrained. IC Role / Device Role / Timing Role: Direct EPROM drop-in replacement providing in-system reprogramming without removing the IC from the PCB. Use Value: 90 ns read access and PDIP-32 footprint maintain timing compliance and mechanical fit while enabling field firmware patches via existing JTAG/debug headers. |
| Automotive Diagnostic Module Code Storage | Point-of-Sale Terminal Configuration Memory |
Use Scenario: Holding diagnostic protocol stacks and calibration tables in OBD-II modules operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary firmware storage with sector-erase capability for independent update of communication stack vs. calibration data. Use Value: Parameter block isolation (two 8K sectors) allows safe over-the-air updates of diagnostic logic without risking calibration data integrity. | Use Scenario: Storing localized language packs, tax rate tables, and peripheral driver configurations in retail terminals deployed globally. IC Role / Device Role / Timing Role: Field-upgradable configuration memory accessed during terminal boot and operator menu navigation. Use Value: Byte-programming (10 µs/byte) enables rapid localization updates during regional deployment without full firmware reload or downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002N-90JC | Same die, PLCC-32 package instead of PDIP-32; 32J footprint with J-leads and surface-mount compatibility. | Requires PCB redesign for SMT assembly; better thermal dissipation and vibration resistance than through-hole PDIP. | Select when migrating to automated assembly or needing improved mechanical robustness in mobile/harsh environments. |
| AT49F002T-90PI | Different boot block address mapping (3C000H–3FFFFH); identical timing, voltage, and command set but incompatible memory layout. | Not interchangeable without firmware address remapping; intended for systems requiring top-address boot code placement. | Select only if system firmware explicitly targets top-sector boot architecture; verify linker script and bootloader compatibility before substitution. |
Compared with AT49F002N-90PI, the AT49F002N-90JC offers identical functionality in an SMT package for higher-density layouts, while the AT49F002T-90PI provides architectural divergence in boot sector location - necessitating firmware validation despite matching electrical specs and pinout.
Availability
AT49F002N-90PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot memory, automotive diagnostic module code storage, and point-of-sale terminal configuration memory requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002N-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 manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49F002N product line delivers 5V-only reprogrammable Flash memory optimized for firmware storage in resource-constrained embedded systems requiring reliable in-system updates and bootloader protection.
FAQ
What is the boot block address range for AT49F002N-90PI?
The boot block address range for AT49F002N-90PI is 00000H to 03FFFH (16K bytes). This fixed bottom-sector location is distinct from the AT49F002T variant, which places the boot block at 3C000H–3FFFFH. The AT49F002N-90PI's boot block supports hardware lockout via command sequence to permanently protect bootloader code from accidental overwrite.
Does AT49F002N-90PI support 12V RESET-based boot block override?
No, AT49F002N-90PI does not support 12V RESET-based boot block override. This feature is explicitly unavailable on the AT49F002N(T) variants per datasheet Rev. 1017D Section 3. The AT49F002N-90PI relies solely on software command sequences for boot lock enable/disable; once activated, the boot block is permanently protected under standard 5V operation.
What is the maximum erase time for AT49F002N-90PI?
The maximum erase time for AT49F002N-90PI is 10 seconds for full-chip or sector erase operations. This value is characterized across the commercial temperature range (0°C to 70°C) and represents worst-case timing under specified VCC and loading conditions. Actual erase completion may be detected earlier using DATA polling (I/O7) or toggle-bit (I/O6) methods.
Can AT49F002N-90PI be used as a direct replacement for EPROMs like 27C256?
Yes, AT49F002N-90PI can serve as a functional EPROM replacement in 8-bit systems due to identical pinout (PDIP-32), CE/OE/WE control interface, and 5V operation. However, it requires minor firmware adaptation to implement command sequences for erase/program - unlike UV-erasable EPROMs, it does not support direct byte-write without prior sector erasure.
What package type does AT49F002N-90PI use and what are its key mechanical features?
AT49F002N-90PI uses a 32-pin plastic dual inline package (PDIP-32, 32P6) with 0.600" width, through-hole mounting, and RoHS-compliant leads. Key mechanical features include pin 1 index marking, NC on pin 9, and recommended 0.1 µF ceramic + 4.7 µF tantalum decoupling at VCC/GND pins. Its footprint matches legacy EPROM sockets, enabling retrofits without PCB modification.
AT49F002N-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
AT49F002N-90PI FAQ
1.How can I place an order for AT49F002N-90PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002N-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 AT49F002N-90PI reliable?
The price and inventory of AT49F002N-90PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002N-90PI is usually 5 days.
3.What payment methods are accepted for AT49F002N-90PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002N-90PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002N-90PI?
AT49F002N-90PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002N-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 AT49F002N-90PI?
For technical support, including AT49F002N-90PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002N-90PI requirements.
6.How does Aetrix verify that AT49F002N-90PI is sourced from the original manufacturer or authorized distributors?
All AT49F002N-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 AT49F002N-90PI meets industry standards.
7.What is the process for return or replacement of AT49F002N-90PI?
All AT49F002N-90PI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002N-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 AT49F002N-90PI part is unused and in its original packaging.
Return procedure for AT49F002N-90PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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