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Microchip Technology AT49F002T-90PI
- Part No.:
- AT49F002T-90PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F002T-90PI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,432
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Product details
Overview
AT49F002T-90PI 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 is used in embedded firmware storage for microcontroller-based systems requiring field-upgradable code.
For engineers reviewing the AT49F002T-90PI datasheet, AT49F002T-90PI pinout, AT49F002T-90PI application, or AT49F002T-90PI equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts - all grounded in Atmel's official documentation for the AT49F002T variant in PDIP package.
Technical Context
The AT49F002T-90PI implements a command-driven Flash architecture with software-controlled sector erase (6-cycle sequence) and byte programming (4-cycle sequence), using standard CE/OE/WE control logic compatible with EPROM interfaces. Its boot block resides at address 3C000H–3FFFFH and supports lockout via 12V RESET override.
It features dual end-of-operation detection: DATA polling (I/O7 complement toggle) and Toggle Bit (I/O6 toggling during program/erase), eliminating need for external timing circuits. Hardware protection includes VCC sense (<3.8V inhibit), noise filtering (<15 ns pulse rejection), and control-line gating (OE low / CE high / WE high disables programming).
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 for 8-bit microcontrollers. |
| Read Access Time | 90 ns max - enables direct execution from flash (XIP) in systems with ≤11 MHz bus timing. |
| Byte Programming Time | 10 µs typical (50 µs max) - allows rapid field updates of configuration or calibration data without system downtime. |
| Erase Cycle Time | 10 seconds max for full chip or sector - balances speed and reliability for infrequent firmware upgrades. |
| Endurance | 10,000 write/erase cycles - sufficient for >5 years of annual firmware revision in industrial control applications. |
| Power Dissipation | 50 mA active current / 100 µA CMOS standby - reduces thermal load in sealed enclosures and extends battery life in backup modes. |
| Operating Voltage | 5.0 V ±10% - eliminates need for dedicated programming voltage rails; compatible with legacy 5V logic systems. |
Pinout & Package
AT49F002T-90PI uses a 32-pin Plastic Dual Inline Package (PDIP), 0.600" wide (package code 32P6), with through-hole mounting and industry-standard footprint.
| 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, A17 selects upper/lower half. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; prevents bus contention when deasserted. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, enabling shared data bus operation. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle; inhibits programming if held high. |
| I/O0–I/O7 | Data Bus | Bi-directional 8-bit data interface; carries command codes, product ID, and memory contents; supports DATA polling on I/O7 and Toggle Bit on I/O6. |
| RESET | Reset Control | Active-low reset input; halts ongoing operations and forces high-Z outputs; 12V input overrides boot block lockout (AT49F002T-specific feature). |
| VCC, GND | Power Supply | Single 5V supply with decoupling required; CMOS standby current <100 µA enables low-power sleep states. |
| DC | No Connect | Pin 1 in DIP package is unconnected - must remain floating; not tied to VCC, GND, or any signal. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Independent erasability of 16K boot block (3C000H–3FFFFH), two 8K parameter blocks, and two main memory blocks enables modular firmware updates without full chip erase. |
| Boot Block Lockout | Software-enabled permanent write protection for secure bootloader code; lockout can be overridden only via 12V on RESET - prevents accidental corruption while allowing recovery. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line gating eliminate unintended writes due to power brownouts, EMI, or glitchy control signals - critical for unattended industrial systems. |
| DATA Polling & Toggle Bit | Dual, software-transparent methods to detect program/erase completion without timers or interrupts - simplifies host firmware and improves system responsiveness. |
| 5V-Only Operation | Eliminates need for 12V programming supplies or level shifters; integrates directly into 5V microcontroller buses with standard timing margins. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; 90 ns read access supports real-time scan cycle execution. Use Value: Enables remote firmware patches without hardware replacement; boot block lockout preserves certified safety startup routines across updates. | Use Scenario: Holding calibrated sensor offsets and regulatory-compliant device parameters in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parameter block (8K × 2) stores user-modifiable settings; sector erase isolates calibration data from application code. Use Value: Ensures traceable, version-controlled configuration changes compliant with IEC 62304; hardware protection prevents corruption during battery swaps. |
| Automotive Body Control Module | Legacy Industrial HMI Bootloader |
Use Scenario: Storing lighting control algorithms and CAN message routing tables in vehicle body electronics modules. IC Role / Device Role / Timing Role: Main memory block (128K) holds executable firmware; 5V-only operation matches automotive 5V supply domains. Use Value: Supports OTA updates via diagnostic port; 10,000-cycle endurance exceeds vehicle lifetime requirements (15+ years). | Use Scenario: Hosting secure bootloader code that validates and loads application images from external SPI flash in human-machine interface terminals. IC Role / Device Role / Timing Role: Boot block (16K) contains immutable startup code; lockout prevents tampering with signature verification logic. Use Value: Meets IEC 61508 SIL-2 requirements for safe boot; 12V RESET override enables authorized recovery after failed update. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002N-90PI | Lacks RESET pin functionality and 12V boot block override; boot block lockout is permanent once enabled. | Not suitable where field recovery from corrupted boot code is required; limited to closed-system deployments. | Select only if bootloader integrity is enforced externally and no in-field recovery path is needed. |
| SST39VF020-90-4C-NHE | 4 Mbit density, 3.3V core (5V tolerant I/O), 90 ns access, no RESET pin, different command set and sector map. | Requires voltage translation for pure 5V systems; incompatible boot block addressing and lockout mechanism. | Choose for higher density or 3.3V system integration; verify command compatibility and sector layout before migration. |
Compared with AT49F002N-90PI, the AT49F002T-90PI adds recoverable boot block protection via 12V RESET - critical for field-deployed devices - while SST39VF020 offers double density but demands redesign of voltage and command logic.
Availability
AT49F002T-90PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AT49F002T-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, nonvolatile memory, and security ICs for embedded systems.
The AT49F002T belongs to Atmel's 5V Flash memory product line, designed specifically for in-system reprogrammability in legacy 5V microcontroller platforms requiring reliable, sector-erasable firmware storage with hardware-level data protection.
FAQ
What is the boot block address range for AT49F002T-90PI?
The boot block for AT49F002T-90PI occupies address range 3C000H to 3FFFFH (16K bytes). This differs from the base AT49F002(N) variant, which locates the boot block at 00000H–03FFFH. The AT49F002T-90PI's upper-address boot block avoids conflict with application code in lower memory regions and aligns with common bootloader placement conventions in 8051 and Z80-based systems.
Does AT49F002T-90PI support 12V programming voltage?
No, AT49F002T-90PI is a 5V-only Flash memory and does not require or accept 12V for programming. However, applying 12V ±0.5V to the RESET pin enables override of the boot block programming lockout - this is strictly for recovery, not programming. All write operations (byte programming, sector erase, chip erase) use standard 5V signaling and command sequences.
How is the AT49F002T-90PI pinout different from AT49F002-90PI?
AT49F002T-90PI and AT49F002-90PI share identical pinout and package (32P6 PDIP), but differ functionally: the "T" suffix denotes the boot block relocated to 3C000H–3FFFFH and inclusion of 12V RESET override capability. The base AT49F002-90PI lacks RESET pin functionality entirely - pin 1 is NC (no connect), whereas AT49F002T-90PI uses pin 1 as active-low RESET with 12V override support.
Can AT49F002T-90PI be used in place of AT49F002N-90PI?
AT49F002T-90PI is pin-compatible and electrically compatible with AT49F002N-90PI, but not functionally identical. The key difference is RESET pin behavior: AT49F002T-90PI supports 12V override of boot block lockout, while AT49F002N-90PI has no RESET functionality and permanent lockout. Substitution is possible if the 12V recovery feature is unused, but firmware must not rely on RESET-driven operations.
What packaging options exist for AT49F002T-90PI?
AT49F002T-90PI is specified in the PDIP package (32P6), denoted by the "PI" suffix. Other package variants include PLCC (JC), TSOP (TC), and VSOP (VC), but AT49F002T-90PI specifically refers to the 32-pin 0.600" wide plastic DIP. All packages maintain identical electrical specifications and command set; only mechanical form factor and thermal characteristics differ.
AT49F002T-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
AT49F002T-90PI FAQ
1.How can I place an order for AT49F002T-90PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002T-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 AT49F002T-90PI reliable?
The price and inventory of AT49F002T-90PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002T-90PI is usually 5 days.
3.What payment methods are accepted for AT49F002T-90PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002T-90PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002T-90PI?
AT49F002T-90PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002T-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 AT49F002T-90PI?
For technical support, including AT49F002T-90PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002T-90PI requirements.
6.How does Aetrix verify that AT49F002T-90PI is sourced from the original manufacturer or authorized distributors?
All AT49F002T-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 AT49F002T-90PI meets industry standards.
7.What is the process for return or replacement of AT49F002T-90PI?
All AT49F002T-90PI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002T-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 AT49F002T-90PI part is unused and in its original packaging.
Return procedure for AT49F002T-90PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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