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Microchip Technology AT49F002T-90PC
- Part No.:
- AT49F002T-90PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F002T-90PC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,575
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Product details
Overview
AT49F002T-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 (10 µs/byte typical) and fast chip erase (10 seconds). It is used in embedded system firmware storage where secure boot code retention and field-upgradable application code are required.
For engineers reviewing the AT49F002T-90PC datasheet, AT49F002T-90PC pinout, AT49F002T-90PC application, or AT49F002T-90PC equivalent, key selection considerations include boot block lockout behavior (enabled via 12V RESET override), sector erase granularity, DATA polling/Toggle Bit end-of-write detection, and compatibility with standard microprocessor bus timing (CE/OE/WE control).
Technical Context
The AT49F002T-90PC implements a command-register-based Flash architecture requiring six-byte software sequences for chip/sector erase and boot lockout enable. Its memory map places the 16K-byte boot block at address 3C000H–3FFFFH - distinct from the AT49F002(N) variant - enabling isolated secure firmware storage.
It uses dual-line chip select (CE/OE) for bus contention avoidance and integrates VCC sense, noise filtering, and program inhibit logic for hardware-level write protection. The RESET pin supports both standard reset (high-to-low) and 12V override for boot block reprogramming when lockout is active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits |
| Read Access Time | 90 ns maximum - determines minimum CPU wait-state insertion for 5 MHz+ bus operation |
| Byte Programming Time | 10 µs typical - enables rapid field updates of small configuration/data segments |
| Erase Cycle Time | 10 seconds max for full chip erase - defines worst-case firmware update latency |
| Write End Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed timing delays in host firmware |
| Boot Block Address Range | 3C000H–3FFFFH (16 KB) - isolates boot code from application updates; lockout enabled via command sequence |
| Power Dissipation | 275 mW typical active (50 mA @ 5.5 V), 100 µA CMOS standby - suitable for low-power embedded systems |
| Endurance | 10,000 program/erase cycles - specifies field-replaceable lifetime for frequently updated sectors |
Pinout & Package
AT49F002T-90PC is supplied in a 32-pin, 0.600" wide plastic dual inline package (PDIP), designated 32P6 per Atmel's ordering matrix. Pin 1 is index-marked; pin 9 is NC (not connected) for this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A17 mapped directly to memory locations |
| 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; used with CE to prevent bus contention during shared-memory operation |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing |
| RESET | Reset / Boot Override | Logic-high = normal operation; low = outputs tri-stated; 12V pulse = unlocks boot block for reprogramming |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface for read data output and program data input; supports DATA polling on I/O7 and Toggle Bit on I/O6 |
| VCC | Power Supply | +5V ±10% supply; internal VCC sense disables programming if voltage drops below ~3.8 V |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K-byte boot block (3C000H–3FFFFH) programmable lockout prevents accidental overwrite of critical startup code |
| 12V RESET Override | Applying 12.0 V ±0.5 V to RESET pin temporarily disables boot lockout, enabling secure field recovery without device replacement |
| Dual Write Completion Detection | Hardware-supported DATA polling (I/O7) and Toggle Bit (I/O6) eliminate polling loops with fixed delays in host firmware |
| Hardware Write Protection | VCC sense, noise filtering (<15 ns pulses rejected), and CE/OE/WE state monitoring prevent spurious programming during power transients or noise |
| Standard Microprocessor Interface | CE/OE/WE timing compliant with common 8051, Z80, and 68K bus protocols - no custom glue logic required |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing field-upgradable ladder logic and I/O configuration in programmable logic controllers with long service life requirements. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-erase capability; boot block holds certified safety startup code, locked against unauthorized modification. Use Value: Enables regulatory-compliant firmware updates without replacing the controller board; 10,000-cycle endurance supports >10 years of scheduled maintenance cycles. | Use Scenario: Holding certified bootloader and diagnostic firmware in Class II medical instruments subject to FDA design controls. IC Role / Device Role / Timing Role: Secure boot memory with hardware-enforced write protection; 12V RESET override allows authorized service technicians to recover corrupted boot code. Use Value: Meets IEC 62304 traceability requirements by separating immutable boot code (3C000H–3FFFFH) from updatable application partitions. |
| Automotive Infotainment Head Unit | Network Router Configuration Storage |
Use Scenario: Storing radio firmware, UI assets, and calibration tables in automotive head units operating across -40°C to +85°C (industrial grade variants). IC Role / Device Role / Timing Role: In-system reprogrammable Flash with 90 ns read speed for real-time UI rendering; parameter blocks store vehicle-specific settings. Use Value: Supports OTA updates via CAN bus gateway; sector erase isolates UI updates from critical radio stack, minimizing risk of bricking. | Use Scenario: Retaining routing tables, security certificates, and VLAN configurations in enterprise-grade managed switches. IC Role / Device Role / Timing Role: Persistent configuration storage with hardware data protection; boot block stores factory-default recovery image. Use Value: Prevents configuration loss during power failure; DATA polling ensures deterministic write completion for audit-log entries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002N-90PC | Same 2 Mbit capacity and 90 ns timing, but boot block located at 00000H–03FFFH (low-address); no 12V RESET override capability | Used where boot code resides in lowest memory region and field recovery does not require hardware override | Select when legacy memory map alignment is required and boot block reprogramming is handled via full-chip erase only |
| SST39VF020-90-4C-NHE | 2 Mbit, 90 ns, 3.3V core (5V tolerant I/O); different command set; no 12V RESET pin; boot block at 00000H | Designed for lower-power 3.3V systems; lacks hardware boot lockout override, relies on software protection only | Select for new designs targeting reduced active power; requires redesign of command-handling firmware and voltage translation |
Compared with AT49F002N-90PC, the AT49F002T-90PC provides relocated boot block addressing and 12V RESET override - critical for secure field recovery. Against SST39VF020, it retains 5V-only simplicity and hardware-level boot protection but consumes higher active current.
Availability
AT49F002T-90PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and automotive infotainment head unit applications requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002T-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 devices.
The AT49F002T series belongs to Atmel's 5V-only Flash memory product line, designed specifically for embedded systems requiring in-system reprogrammability, hardware write protection, and secure boot code isolation.
FAQ
What is the boot block address range for AT49F002T-90PC?
The AT49F002T-90PC locates its 16K-byte boot block at address range 3C000H–3FFFFH. This differs from the AT49F002(N) variant (00000H–03FFFH) and ensures separation of secure boot code from application firmware stored in main memory blocks. The AT49F002T-90PC datasheet confirms this mapping in the memory organization diagram and command definitions section.
Does AT49F002T-90PC support 12V programming override?
Yes, AT49F002T-90PC supports 12V ±0.5V applied to the RESET pin to temporarily disable the boot block programming lockout feature. This allows authorized reprogramming of the protected boot sector without requiring full-chip erase. The AT49F002T-90PC datasheet explicitly documents this function in the "Boot Block Programming Lockout Override" section.
How is write completion detected on AT49F002T-90PC?
AT49F002T-90PC provides two hardware methods: DATA polling (reading the last programmed byte returns its complement on I/O7 until complete) and Toggle Bit (I/O6 toggles between 0 and 1 during programming/erase, then stabilizes). Both are documented in the AT49F002T-90PC AC characteristics and waveforms sections and require no external timing components.
What package type is used for AT49F002T-90PC?
AT49F002T-90PC is packaged in a 32-pin, 0.600" wide plastic dual inline package (PDIP), designated as 32P6 in Atmel's ordering information. Pin 9 is marked NC (not connected), consistent with the AT49F002(N)(T) family specification. Mechanical dimensions and lead finish are defined in the AT49F002T-90PC packaging information appendix.
Is AT49F002T-90PC compatible with standard microprocessor buses?
Yes, AT49F002T-90PC uses industry-standard CE/OE/WE control signals and adheres to common microprocessor timing (e.g., 8051, Z80). Its read cycle requires CE and OE low with WE high; write cycles follow four- or six-bus-cycle command sequences synchronized to WE/CE edges. These interface requirements are fully specified in the AT49F002T-90PC device operation and AC timing tables.
AT49F002T-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
AT49F002T-90PC FAQ
1.How can I place an order for AT49F002T-90PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002T-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 AT49F002T-90PC reliable?
The price and inventory of AT49F002T-90PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002T-90PC is usually 5 days.
3.What payment methods are accepted for AT49F002T-90PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002T-90PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002T-90PC?
AT49F002T-90PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002T-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 AT49F002T-90PC?
For technical support, including AT49F002T-90PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002T-90PC requirements.
6.How does Aetrix verify that AT49F002T-90PC is sourced from the original manufacturer or authorized distributors?
All AT49F002T-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 AT49F002T-90PC meets industry standards.
7.What is the process for return or replacement of AT49F002T-90PC?
All AT49F002T-90PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002T-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 AT49F002T-90PC part is unused and in its original packaging.
Return procedure for AT49F002T-90PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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