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Microchip Technology AT49F002AT-55TI
- Part No.:
- AT49F002AT-55TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F002AT-55TI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,096
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Product details
Overview
AT49F002AT-55TI from Atmel is a 2 Mbit (256K × 8) 5V-only in-system reprogrammable Flash memory IC with 55 ns read access time, 20 µs/byte programming, and sector-based erase architecture including one 16K-byte boot block (address range 3C000H–3FFFFH), two 8K-byte parameter blocks, and four main memory blocks. It operates across the industrial temperature range (−40°C to +85°C) and supports standard EPROM-like CE/OE/WE control for embedded firmware storage.
For engineers reviewing the AT49F002AT-55TI datasheet, AT49F002AT-55TI pinout, AT49F002AT-55TI application, or AT49F002AT-55TI equivalent, key selection considerations include boot block lockout behavior (enabled via command sequence, override via 12V RESET), DATA polling/toggle bit end-of-program detection, and TSOP-32 package compatibility with 5V-only system buses requiring nonvolatile code storage with field-upgradable sectors.
Technical Context
The AT49F002AT-55TI implements a sector-erasable Flash architecture with dedicated 16K-byte boot block (3C000H–3FFFFH), two 8K-byte parameter blocks (3A000H–3BFFFH and 38000H–39FFFH), and four main memory blocks (30000H–37FFFH, 20000H–2FFFFH, 10000H–1FFFFH, 00000H–0FFFFH). Its command-set-driven operation uses six-cycle sequences for chip/sector erase and four-cycle sequences for byte programming, all executed with standard 5V logic levels-no high-voltage programming required.
Hardware data protection includes VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low, CE high, or WE high blocks writes). The RESET pin enables boot block reprogramming override at 12V ±0.5V-a feature absent in AN(T) variants-and forces high-impedance output during reset transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized for byte-wide parallel bus interfacing |
| Read Access Time | 55 ns maximum-enables direct replacement of fast EPROMs in legacy 5V microcontroller systems |
| Byte Programming Time | 20 µs typical-supports rapid in-field firmware patching without external timing circuitry |
| Erase Cycle Time | 4 seconds maximum for full chip erase-allows predictable update windows in production test and field service |
| End-of-Program Detection | DATA polling (I/O7 complement) and toggle bit (I/O6 toggling)-eliminates need for fixed delay timers in host firmware |
| Power Dissipation | 30 mA active current / 100 µA CMOS standby-suitable for low-power industrial controllers with sleep/wake cycles |
| Write Endurance | 10,000 program/erase cycles-validated for repeated firmware updates over product lifetime |
Pinout & Package
AT49F002AT-55TI is packaged in a 32-lead Plastic Thin Small Outline Package (TSOP, Type I, 8 × 20 mm), compliant with JEDEC MO-142 Variation BD. Pin 9 is no-connect (NC) per datasheet specification.
| 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 Inputs/Outputs | Bi-directional 8-bit data bus; 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 mode |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low write strobe; latches addresses/data during command and programming cycles |
| RESET | Reset Input | Active-low reset; 12V ±0.5V applied to override boot block lockout-critical for secure firmware recovery |
| VCC | Power Supply | +5V ±10% supply; internal VCC sense disables programming if voltage drops below 3.8V |
| GND | Ground | Reference for all I/O and power pins; decoupling required near VCC pin per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for dual-voltage regulators or charge pumps-reduces BOM cost and board space in 5V-only systems |
| Boot Block Programming Lockout | 16K-byte region (3C000H–3FFFFH) permanently protected after command activation-ensures bootloader integrity during field updates |
| Sector Erase Architecture | Independent erasure of two 8K-byte parameter blocks and four main memory blocks-enables granular firmware partitioning and wear leveling |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibition prevent accidental writes-critical for reliability in electrically noisy industrial environments |
| Green Packaging Option | Pb/halide-free TSOP package compliant with RoHS Directive 2002/95/EC-meets environmental compliance requirements for global shipments |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-erase capability enabling incremental firmware updates without full reflash; 55 ns access ensures real-time instruction fetch latency compliance. Use Value: Boot block lockout prevents corruption of critical startup routines during remote updates, while 10,000-cycle endurance supports multi-year field deployment with periodic patches. | Use Scenario: Hosting secure bootloader code in engine control units where tamper-resistant firmware initialization is mandated by OEM functional safety requirements. IC Role / Device Role / Timing Role: Trusted boot memory with 12V RESET override for emergency recovery-used during diagnostic flash programming sessions requiring bootloader revalidation. Use Value: Dedicated 16K-byte boot block (3C000H–3FFFFH) isolates immutable startup code from application memory, satisfying ASIL-B traceability and anti-rollback requirements. |
| Medical Device Configuration Storage | Networking Equipment Parameter Tables |
Use Scenario: Retaining calibrated sensor offsets, user preferences, and regulatory audit logs in portable diagnostic instruments operating under battery-backed standby conditions. IC Role / Device Role / Timing Role: Low-power nonvolatile storage with 100 µA CMOS standby current-minimizes battery drain during extended idle periods between measurements. Use Value: Sector architecture allows independent erase of parameter blocks without disturbing calibration constants stored in the boot block, ensuring data continuity across firmware upgrades. | Use Scenario: Holding MAC address tables, VLAN configurations, and QoS policy rules in managed Ethernet switches requiring persistent, field-updatable settings. IC Role / Device Role / Timing Role: Parallel-interface Flash memory mapped into CPU address space for deterministic register-level access during packet processing interrupts. Use Value: 20 µs/byte programming enables rapid table updates during link flapping events, while DATA polling eliminates polling overhead in interrupt-service routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002A-55TI | Same density, speed, and TSOP-32 package; boot block at 00000H–03FFFH (not 3C000H–3FFFFH) | Requires address remapping in host firmware; lacks 12V RESET override for boot block | Select when legacy address layout compatibility is prioritized over secure boot recovery capability |
| AT49F002ANT-55TI | Includes NC pin on pin 1 (PLCC) and pin 9 (TSOP); identical electrical specs and sector map to AT49F002AT-55TI | No functional difference in TSOP-32; NC pin has no impact on PCB layout or signal routing | Select when sourcing flexibility across AT49F002A(N)(T) family variants is needed without design change |
Compared with AT49F002A-55TI, AT49F002AT-55TI provides relocated boot block addressing and 12V RESET override-critical for secure boot recovery-while AT49F002ANT-55TI offers identical functionality with explicit NC pin documentation, simplifying validation across multiple package variants.
Availability
AT49F002AT-55TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU bootloader memory, medical device configuration storage, and networking equipment parameter tables requiring stable component supply and long-term lifecycle support.
Supply support for AT49F002AT-55TI 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 security ICs, with a legacy of robust industrial-grade nonvolatile memory solutions.
The AT49F002A(N)(T) product line delivers 5V-only in-system reprogrammable Flash memory for embedded systems requiring field-upgradable firmware with hardware-enforced boot code protection and sector-level erase granularity.
FAQ
What is the boot block address range for AT49F002AT-55TI?
The boot block for AT49F002AT-55TI occupies address range 3C000H to 3FFFFH (16K bytes), distinct from the AT49F002A-55TI's 00000H–03FFFH mapping. This relocation enables separation of secure bootloader code from application firmware in memory-mapped systems, and is confirmed in Section 4.6 and Note 3 of the datasheet. The AT49F002AT-55TI boot block lockout feature, once enabled, prevents reprogramming at ≤5.5V but allows override via 12V on the RESET pin.
Does AT49F002AT-55TI require high-voltage programming signals?
No, AT49F002AT-55TI operates with single 5V supply only-no high-voltage programming signals are required. All commands (read, program, erase, lockout) use standard 5V logic levels on CE, OE, WE, and address/data lines. Programming is internally generated via the command register, and the 12V RESET override is strictly for boot block recovery-not routine programming. This eliminates external charge pumps and simplifies system power design compared to older Flash technologies.
How is end-of-program detection implemented in AT49F002AT-55TI?
AT49F002AT-55TI provides two hardware-supported end-of-program detection methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and toggle bit (I/O6 toggles between 0 and 1 during programming and stabilizes upon completion). Both methods eliminate software timing loops, reduce host CPU overhead, and are usable at any point during the 20 µs typical programming cycle. These features are documented in Sections 4.8 and 4.9 of the datasheet.
What is the function of the RESET pin on AT49F002AT-55TI?
The RESET pin on AT49F002AT-55TI serves dual roles: (1) active-low reset that halts ongoing operations and places outputs in high-impedance state, and (2) 12V ±0.5V override input to reprogram the locked boot block-even after lockout activation. This override capability is exclusive to AT49F002AT-55TI and AT49F002A-55TI; it is not available on AN(T) variants. The RESET pin's dual functionality is critical for secure bootloader recovery in deployed systems.
Is AT49F002AT-55TI compatible with standard EPROM interfaces?
Yes, AT49F002AT-55TI is designed for drop-in compatibility with standard EPROM interfaces: it uses identical CE/OE/WE control signaling, outputs valid data within 55 ns of address/CE assertion, and presents high-impedance outputs when deselected. Its byte-wide parallel interface, 256K × 8 organization, and EPROM-like read protocol allow direct substitution in existing 5V microcontroller systems without bus controller modification-confirmed in Section 4.1 "Read" of the datasheet.
AT49F002AT-55TI 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:
- 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-TSOP
AT49F002AT-55TI FAQ
1.How can I place an order for AT49F002AT-55TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002AT-55TI 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-55TI reliable?
The price and inventory of AT49F002AT-55TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002AT-55TI is usually 5 days.
3.What payment methods are accepted for AT49F002AT-55TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002AT-55TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002AT-55TI?
AT49F002AT-55TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002AT-55TI 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-55TI?
For technical support, including AT49F002AT-55TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002AT-55TI requirements.
6.How does Aetrix verify that AT49F002AT-55TI is sourced from the original manufacturer or authorized distributors?
All AT49F002AT-55TI 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-55TI meets industry standards.
7.What is the process for return or replacement of AT49F002AT-55TI?
All AT49F002AT-55TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002AT-55TI, 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-55TI part is unused and in its original packaging.
Return procedure for AT49F002AT-55TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F002AT-55TI Tags
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