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Microchip Technology AT49F002AT-55VI
- Part No.:
- AT49F002AT-55VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F002AT-55VI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,685
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Product details
Overview
AT49F002AT-55VI from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory with 55 ns read access time, 20 µs/byte programming, 4-second chip erase, and sector architecture including one 16K-byte boot block (address range 3C000H–3FFFFH), two 8K-byte parameter blocks, and four main memory blocks. It supports DATA polling and toggle-bit end-of-cycle detection and is used in embedded firmware storage for industrial microcontroller systems requiring field-upgradable code.
For engineers reviewing the AT49F002AT-55VI datasheet, AT49F002AT-55VI pinout, AT49F002AT-55VI application, or AT49F002AT-55VI equivalent, key selection criteria include boot-block lockout behavior under 5.5V operation, TSOP-32 vs. VSOP-32 package compatibility, sector erase timing, hardware data protection thresholds, and RESET-pin override capability at 12V for boot-block reprogramming.
Technical Context
The AT49F002AT-55VI implements a command-based Flash architecture with six-cycle sector erase and four-cycle byte programming sequences using standard CE/OE/WE control logic. Its internal program timer and automatic pulse generation eliminate external timing circuitry, while DATA polling on I/O7 and toggle-bit monitoring on I/O6 provide real-time cycle completion feedback without interrupt overhead.
It features dual-mode boot-block protection: software-enabled lockout prevents reprogramming at ≤5.5V, but 12V applied to RESET overrides the lock for chip/sector erase or byte write-functionality absent in AN(T) variants. The device operates across –40°C to +85°C with CMOS standby current <100 µA and active current ≤30 mA at 5 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), enabling full firmware image storage for mid-complexity 8/16-bit MCUs |
| Read Access Time | 55 ns max - meets timing budgets for 16–20 MHz bus interfaces without wait states |
| Byte Programming Time | 20 µs typical - supports rapid field updates of configuration or calibration data |
| Chip Erase Time | 4 seconds max - enables predictable firmware recovery during production or service |
| Boot Block Size & Location | 16K bytes at 3C000H–3FFFFH - isolates secure bootloader code from application updates |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5V logic rails and eliminates level-shifting needs |
| Endurance | 10,000 program/erase cycles - sufficient for infrequent firmware upgrades over 10+ year product life |
Pinout & Package
AT49F002AT-55VI is supplied in a 32-lead Plastic Thin Small Outline Package (VSOP), 8 mm × 14 mm body, JEDEC MO-142 BA compliant, with gull-wing leads and pin 1 identifier marked. Pin 9 is no-connect (NC) per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A11 is don't-care in command cycles |
| I/O0–I/O7 | Data Bus | Bi-directional 8-bit data path; I/O7 used for DATA polling, I/O6 for toggle-bit status |
| CE | Chip Enable | Active-low chip select; must be low with OE low for read, high to enter standby (<100 µA) |
| OE | Output Enable | Active-low output gate; controls data bus drive; high forces outputs to high-Z |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command cycles |
| RESET | Reset Control | Active-low reset; 12V input enables boot-block override - critical for secure firmware recovery |
| VCC / GND | Power Supply | 5V supply and ground; VCC sense disables programming if voltage drops below 3.8V |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Operation | Eliminates need for 12V programming supplies - simplifies power design and reduces BOM cost |
| Boot Block Lockout | Software-enabled protection of 16K-byte boot sector at 3C000H–3FFFFH ensures bootloader integrity during field updates |
| Hardware Data Protection | VCC sense (<3.8V inhibit), noise filtering (<15 ns pulses ignored), and control-line interlock prevent accidental writes |
| DATA Polling & Toggle Bit | Real-time, non-interrupt end-of-program/erase detection via I/O7 complement or I/O6 toggling - no timer polling required |
| Green Packaging | Pb/halide-free VSOP-32 package complies with RoHS Directive 2011/65/EU without derating |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader |
|---|---|
Use Scenario: Storing upgradeable ladder logic and I/O mapping tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-erase granularity enabling partial updates without disrupting runtime logic execution. Use Value: 4-second chip erase and 20 µs/byte programming allow sub-minute field firmware patches while maintaining >10,000-cycle endurance over 15-year deployment. | Use Scenario: Hosting certified bootloader code in Class IIa medical infusion pumps requiring regulatory-compliant firmware update mechanisms. IC Role / Device Role / Timing Role: Secure boot memory with hardware-enforced write protection for bootloader region (3C000H–3FFFFH). Use Value: 12V RESET override enables authorized service personnel to recover corrupted boot code without replacing the module - meeting IEC 62304 SW lifecycle requirements. |
| Automotive Diagnostic Module | Point-of-Sale Terminal Configuration |
Use Scenario: Storing OBD-II protocol stacks and vehicle-specific calibration data in aftermarket diagnostic tools operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-stable Flash memory interfacing directly to 8-bit MCU buses with no level shifters. Use Value: 55 ns read access and 5V-only operation ensure deterministic response times for real-time CAN message parsing and display rendering. | Use Scenario: Holding localized language packs, tax tables, and payment gateway keys in retail terminals subject to frequent regional compliance updates. IC Role / Device Role / Timing Role: Field-reprogrammable configuration store with parameter-block architecture (two 8K sections) for atomic table swaps. Use Value: Independent 8K parameter block erasure allows zero-downtime tax-table updates without affecting core application code in main memory blocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002ANT-55VI | No RESET pin functionality; boot block lockout cannot be overridden with 12V - permanent protection once enabled | Suitable for applications where boot code must remain immutable after factory programming | Select when absolute bootloader immutability is required and field recovery via RESET is unnecessary |
| SST39VF020-55-4C-NHE | Same density and 55 ns speed, but uses different command set; no 12V RESET override; 3.3V tolerant inputs | Requires redesign of firmware update routines; lacks boot-block address remapping (fixed 00000H–03FFFH) | Choose only if migrating to 3.3V system architecture and accepting modified command sequence implementation |
Compared with AT49F002ANT-55VI, AT49F002AT-55VI provides field-recoverable boot code via 12V RESET override - critical for serviceable embedded systems. Versus SST39VF020, it retains legacy 5V-only compatibility and boot-block relocation (3C000H–3FFFFH), avoiding firmware address-space refactoring.
Availability
AT49F002AT-55VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloaders, automotive diagnostic modules, and point-of-sale terminal configuration requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002AT-55VI 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 IoT applications.
The AT49F002A(N)(T) family delivers 5V-only Flash memory optimized for in-system reprogramming in resource-constrained embedded systems where simplicity, reliability, and field-upgradability are essential.
FAQ
What is the boot block address range for AT49F002AT-55VI?
The boot block for AT49F002AT-55VI occupies addresses 3C000H to 3FFFFH (16K bytes), distinct from the AT49F002A(N) variant which places it at 00000H–03FFFH. This relocated boot sector enables flexible memory mapping in systems where lower-address space is reserved for RAM or peripherals. The AT49F002AT-55VI's boot block lockout feature operates within this range and can be overridden using 12V on the RESET pin.
Does AT49F002AT-55VI support 12V programming voltage?
No, AT49F002AT-55VI is a 5V-only Flash memory: all read, program, and erase operations use 5.0 V ±10%. However, 12.0 V ±0.5 V applied to the RESET pin enables override of the boot block programming lockout - this is not a programming voltage but a dedicated recovery signal. The AT49F002AT-55VI does not require or accept 12V on VCC, WE, or any other pin during normal operation.
How does the DATA polling feature work on AT49F002AT-55VI?
During byte programming, reading the last written address returns the complement of the loaded data on I/O7 until programming completes; once valid data appears on I/O7, the cycle is finished. This allows the host MCU to poll asynchronously without timers or interrupts. The AT49F002AT-55VI supports DATA polling at any time during the 20–50 µs programming window, and the feature works identically for sector and chip erase confirmation.
What package type is used for AT49F002AT-55VI?
AT49F002AT-55VI uses a 32-lead Plastic Thin Small Outline Package (VSOP), 8 mm × 14 mm body size, JEDEC MO-142 BA compliant, with gull-wing leads and pin 1 marked. Pin 9 is no-connect (NC). This VSOP variant offers lower profile and better thermal performance than the PLCC (32J) or standard TSOP (32T) options, making it suitable for space-constrained industrial PCB layouts.
Is AT49F002AT-55VI pin-compatible with AT49F002A-55VI?
Yes, AT49F002AT-55VI is pin-compatible with AT49F002A-55VI, AT49F002AN-55VI, and AT49F002ANT-55VI - all share identical 32-pin VSOP footprints, pin functions, and electrical interface. However, functional differences exist: only AT49F002AT-55VI and AT49F002A-55VI support 12V RESET override; AT49F002AN-55VI and AT49F002ANT-55VI omit RESET functionality entirely. Board-level substitution requires firmware validation of boot-block behavior.
AT49F002AT-55VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm 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:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49F002AT-55VI FAQ
1.How can I place an order for AT49F002AT-55VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002AT-55VI 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 AT49F002AT-55VI reliable?
The price and inventory of AT49F002AT-55VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002AT-55VI is usually 5 days.
3.What payment methods are accepted for AT49F002AT-55VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002AT-55VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002AT-55VI?
AT49F002AT-55VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002AT-55VI 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 AT49F002AT-55VI?
For technical support, including AT49F002AT-55VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002AT-55VI requirements.
6.How does Aetrix verify that AT49F002AT-55VI is sourced from the original manufacturer or authorized distributors?
All AT49F002AT-55VI 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 AT49F002AT-55VI meets industry standards.
7.What is the process for return or replacement of AT49F002AT-55VI?
All AT49F002AT-55VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002AT-55VI, 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 AT49F002AT-55VI part is unused and in its original packaging.
Return procedure for AT49F002AT-55VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F002AT-55VI Tags
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