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Microchip Technology AT49F002-90TC
- Part No.:
- AT49F002-90TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F002-90TC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,945
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Product details
Overview
AT49F002-90TC from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC with 90 ns read access time, 10 µs typical byte programming, and sector-based architecture including a 16K-byte boot block with programmable lockout. 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 AT49F002-90TC datasheet, AT49F002-90TC pinout, AT49F002-90TC application, or AT49F002-90TC equivalent, key selection considerations include its TSOP-32 package, 5V single-supply operation, boot-sector protection capability, DATA polling/Toggle Bit erase/program status detection, and compatibility with standard EPROM-like bus interface timing.
Technical Context
The AT49F002-90TC implements a command-register-based architecture for software-controlled erase and program operations without high-voltage inputs. Its sector organization-comprising one 16K-byte boot block, two 8K-byte parameter blocks, and two main memory blocks (96K/128K bytes)-enables selective erasure and secure firmware partitioning.
It supports hardware data protection via VCC sense (<3.8 V inhibits programming), noise filtering on WE/CE (<15 ns pulses ignored), and control-line inhibition (OE low, CE high, or WE high blocks writes). The RESET pin enables system-level reset and, at 12 V, overrides boot-block lockout for recovery.
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 - defines maximum clock-to-data delay in microprocessor bus reads |
| Byte Programming Time | 10 µs typical - enables rapid incremental firmware updates without full-chip erase |
| Erase Cycle Time | 10 seconds - fixed internal timer for chip or sector erase, no external clocks needed |
| Supply Voltage | 5 V ±10% - single-rail operation eliminates need for charge pumps or auxiliary supplies |
| Active Current | 50 mA - determines power budget during read or programming bursts |
| Standby Current | 100 µA CMOS - enables low-power retention in battery-backed or sleep-mode systems |
| Endurance | 10,000 write/erase cycles - specifies guaranteed reprogrammability before wear-out |
Pinout & Package
AT49F002-90TC uses a 32-lead Plastic Thin Small Outline Package (TSOP, 8 × 20 mm, Type 1), compliant with JEDEC MO-153. Pin 1 is located at top-left corner with index mark; pin 9 is NC (no connect) per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing space |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8-bit microcontrollers and bus controllers |
| CE | Chip Enable | Active-low chip select; enables device for read/write when low and OE/WE configured |
| OE | Output Enable | Active-low output gate; controls data bus drive to avoid contention during shared-bus operation |
| WE | Write Enable | Active-low write strobe; latches address/data and initiates command sequences on falling/rising edges |
| RESET | Reset Input | Active-low system reset; halts ongoing operations and forces high-Z outputs; 12 V override enables boot-block reprogramming |
| VCC | Power Supply | +5 V supply input; powers core logic, memory array, and I/O buffers |
| GND | Ground | Reference return path for all signals and power; requires low-impedance PCB connection |
| DC | No Connect | Pin 9 is unconnected; must be left floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16K-byte protected region (3C000H–3FFFFH) prevents accidental overwrite of bootloader code; enabled via 6-cycle command sequence |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggle provide real-time, software-readable status of program/erase completion without polling timers or external hardware |
| Sector Erase Flexibility | Independent erasure of two 8K parameter blocks and two main memory blocks (96K/128K) allows modular firmware updates and wear leveling |
| Hardware Write Protection | VCC sense, noise filtering, and control-line inhibition prevent spurious writes during power transients or EMI events |
| 5V-Only Reprogrammability | Eliminates need for +12 V programming voltage; simplifies system design and reduces BOM count |
Applications
| Industrial PLC Firmware Storage | Automotive Instrument Cluster Bootloader |
|---|---|
Use Scenario: Storing firmware for programmable logic controllers that require field updates via serial interface or USB host. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast 90 ns read access for deterministic instruction fetch and sector-erase capability for safe over-the-air updates. Use Value: Boot block lockout ensures bootloader integrity while parameter blocks store calibration data, enabling reliable reconfiguration without risking system startup failure. | Use Scenario: Holding boot code and display firmware in automotive digital dashboards where safety-critical startup behavior must be guaranteed. IC Role / Device Role / Timing Role: Secure flash memory providing 5V-compatible, electrically erasable storage with RESET-driven recovery mode for failed update scenarios. Use Value: 12 V RESET override allows service technicians to restore corrupted boot code without replacing the module, reducing warranty costs and downtime. |
| Medical Device Configuration Memory | Networking Equipment Parameter Storage |
Use Scenario: Retaining user-configurable settings (e.g., alarm thresholds, measurement units) in portable diagnostic equipment with battery backup. IC Role / Device Role / Timing Role: Low-power (100 µA standby) nonvolatile memory supporting byte-level writes for infrequent configuration changes. Use Value: Hardware data protection prevents unintended writes during brown-out conditions, ensuring regulatory compliance for data integrity in Class II medical devices. | Use Scenario: Storing MAC addresses, firmware version stamps, and port initialization parameters in Ethernet switches and routers. IC Role / Device Role / Timing Role: Parallel-interface flash memory interfaced to ARM or MIPS SoCs for fast configuration loading at power-on. Use Value: Sector architecture isolates critical identity data (in parameter blocks) from main firmware, allowing independent updates without risking device identification loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002-90JI | Same 2 Mbit density and 90 ns speed, but in PDIP-32 package with industrial temperature range (–40°C to +85°C) | Used where through-hole mounting or extended thermal operation is required; lacks TSOP footprint and RESET override capability | Select when board-level reliability under thermal cycling or legacy prototyping demands DIP packaging |
| AT49F002T-90TC | Identical TSOP-32 package and timing, but features relocated boot block (3C000H–3FFFFH) and distinct device ID (08H vs. 07H) | Designed for systems requiring boot code at top of address space; not interchangeable without firmware address remapping | Select only if application firmware explicitly targets AT49F002T's memory map and requires its specific product ID for auto-detection |
Compared with AT49F002-90JI and AT49F002T-90TC, the AT49F002-90TC offers commercial-temperature TSOP packaging with bottom-addressed boot block (00000H–03FFFH) and standard device ID (07H), making it optimal for cost-sensitive, surface-mount embedded designs where firmware resides in lower memory space.
Availability
AT49F002-90TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive instrument cluster bootloaders, and medical device configuration memory requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002-90TC 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 AT49F002 family was designed as a drop-in EPROM replacement offering in-system reprogrammability, targeted at cost-sensitive 8-bit and 16-bit microcontroller platforms needing field-upgradable firmware storage.
FAQ
What is the memory organization of the AT49F002-90TC?
The AT49F002-90TC contains 2 Mbit of Flash memory organized as 262,144 words × 8 bits (256K × 8). Its physical address space spans 00000H to 3FFFFH, with sector layout including a 16K-byte boot block, two 8K-byte parameter blocks, and two main memory blocks totaling 224K bytes. This structure is confirmed in the device's block diagram and memory map tables.
Does the AT49F002-90TC support hardware reset and boot block override?
Yes, the AT49F002-90TC includes a dedicated RESET pin that halts operations and forces outputs to high-impedance. Critically, applying 12 V ± 0.5 V to this pin overrides the boot block programming lockout, enabling chip/sector erase or byte programming of the protected region. This feature is explicitly documented in the "Boot Block Programming Lockout Override" section and is absent in AT49F002N(T) variants.
How does the AT49F002-90TC indicate completion of a program or erase cycle?
The AT49F002-90TC provides two hardware-supported status mechanisms: DATA polling (I/O7 returns complement of written data until completion, then true data) and Toggle Bit (I/O6 toggles between 0 and 1 during operation, then stabilizes). Both methods allow software to detect completion without fixed delays or external timers, as verified in the "DATA Polling Waveforms" and "Toggle Bit Waveforms" sections.
What is the purpose of the DC (Don't Connect) pin on the AT49F002-90TC?
Pin 9 on the AT49F002-90TC is designated DC (Don't Connect) and must remain unconnected. This is specified in the "Pin Configurations" section for TSOP packages and confirmed in the ordering information table. Connecting this pin may cause undefined behavior or damage, as it has no internal bond and is not electrically referenced.
Can the AT49F002-90TC be used as a direct replacement for standard EPROMs?
Yes, the AT49F002-90TC is designed for EPROM socket compatibility with identical pinout (TSOP-32), 5V-only operation, and standard CE/OE/WE control signaling. Its read timing (90 ns tACC) matches common EPROMs like 27C256, and it supports the same bus interface protocol - confirmed in the "READ" section and AC Read Waveforms. No hardware redesign is needed for migration.
AT49F002-90TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- 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:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49F002-90TC FAQ
1.How can I place an order for AT49F002-90TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002-90TC 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 AT49F002-90TC reliable?
The price and inventory of AT49F002-90TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002-90TC is usually 5 days.
3.What payment methods are accepted for AT49F002-90TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002-90TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002-90TC?
AT49F002-90TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002-90TC 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 AT49F002-90TC?
For technical support, including AT49F002-90TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002-90TC requirements.
6.How does Aetrix verify that AT49F002-90TC is sourced from the original manufacturer or authorized distributors?
All AT49F002-90TC 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 AT49F002-90TC meets industry standards.
7.What is the process for return or replacement of AT49F002-90TC?
All AT49F002-90TC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002-90TC, 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 AT49F002-90TC part is unused and in its original packaging.
Return procedure for AT49F002-90TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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