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Microchip Technology AT49F001T-55JI
- Part No.:
- AT49F001T-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001T-55JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,169
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Product details
Overview
AT49F001T-55JI from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded controllers and boot firmware applications. It features 55 ns read access time, 10 µs typical byte programming, 10-second chip erase, sector-based architecture (16K boot block + two 8K parameter blocks + 32K/64K main memory), and hardware data protection with VCC sense and noise filtering.
For engineers reviewing the AT49F001T-55JI datasheet, AT49F001T-55JI pinout, AT49F001T-55JI application, or AT49F001T-55JI equivalent, key selection considerations include industrial temperature range (–40°C to +85°C), PLCC-32 package compatibility, boot block lockout functionality with 12V RESET override, DATA polling and toggle-bit program/erase status detection, and 5V-only command interface eliminating high-voltage programming circuitry.
Technical Context
The AT49F001T-55JI implements a command-register-based architecture requiring six-byte software sequences for chip/sector erase and boot lockout enablement. Its memory map places the 16K boot block at address range 1C000H–1FFFFH - distinct from the AT49F001(N) variant - enabling secure bootloader storage while permitting independent reprogramming of parameter and main memory blocks.
Operation relies on standard microprocessor control signals (CE/OE/WE) with dual-line bus contention prevention; RESET is active-low and supports 12V override for boot block reprogramming. Internal timing eliminates external clocks during erase, and hardware protections (VCC sense <3.8V inhibit, WE/CE pulse rejection <15 ns) prevent inadvertent writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - sufficient for compact boot firmware and configuration data storage. |
| Read Access Time | 55 ns maximum - enables direct interfacing with 12–15 MHz microcontrollers without wait states. |
| Byte Programming Time | 10 µs typical (50 µs max) - supports fast field updates of small data segments without system interruption. |
| Erase Cycle Time | 10 seconds typical for full chip erase - deterministic timing allows precise host software scheduling of background erase operations. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and toggle-bit (I/O6 toggling) - eliminates need for fixed delay timers during programming/erasing. |
| Power Dissipation | 275 mW active (50 mA @ 5V), 100 µA CMOS standby - suitable for low-power industrial systems with intermittent firmware access. |
| Endurance | 10,000 write/erase cycles - validated for long-term field deployment in programmable logic controllers and instrumentation. |
Pinout & Package
AT49F001T-55JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC-32) package per JEDEC MS-016, Variation AE, with pin 1 identifier and J-leads. Dimensions: 12.45 mm × 14.95 mm × 3.35 mm (max height). Lead coplanarity ≤0.102 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0–A16 directly map to memory locations 00000H–1FFFFH. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface for read data output and program data input; high-impedance when CE or OE is high. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; inhibits programming if held high. |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention; high disables outputs to high-Z state. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences; noise-filtered against <15 ns glitches. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces outputs to high-Z; 12V input enables boot block override (not available on N(T) variants). |
| VCC | Power Supply | +5V ±10% supply; internal VCC sense disables programming if voltage drops below ~3.8V. |
| GND | Ground | Reference ground for all I/O and internal circuitry; decoupling required near VCC pin. |
| NC | No Connect | Pin 32 in PLCC package - must remain unconnected; not internally bonded. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K boot block (1C000H–1FFFFH) supports permanent or 12V-overridable write protection - ensures bootloader integrity across firmware updates. |
| 5V-Only Command Interface | Eliminates external high-voltage generators; all read, program, erase, and lockout commands executed using standard 5V logic levels. |
| Hardware Data Protection | VCC sense, WE/CE noise filtering (<15 ns), and control-line inhibition (OE low/CE high/WE high) prevent spurious writes during power transients or noise events. |
| Two End-of-Operation Detection Methods | DATA polling (I/O7 complement) and toggle-bit (I/O6 toggling) provide redundant, software-pollable status - improves reliability in interrupt-constrained environments. |
| Industrial Temperature Range | Specified for –40°C to +85°C operation - qualified for use in programmable automation controllers, motor drives, and outdoor telemetry systems. |
Applications
| Industrial PLC Firmware Storage | Embedded Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage IC providing 55 ns read access to support real-time scan cycle execution; boot block holds immutable startup routines. Use Value: Sector erase capability allows selective update of application logic without disturbing bootloader or calibration data, reducing field maintenance downtime. |
Use Scenario: Hosting secure boot code in microcontroller-based medical devices requiring regulatory-compliant firmware validation and anti-tampering. IC Role / Device Role / Timing Role: Dedicated boot memory IC with 12V RESET override enabling authorized recovery of corrupted bootloader - critical for FDA Class II device fail-safe operation. Use Value: Boot block lockout prevents unauthorized modification while allowing certified service personnel to restore functionality via controlled 12V signal injection. |
| Telecom Equipment Parameter Storage | Automotive Diagnostic Module Memory |
Use Scenario: Retaining network configuration, calibration offsets, and fault logs in DSLAM line cards operating continuously in telecom central offices. IC Role / Device Role / Timing Role: Parameter block (two 8K sections) stores volatile-configuration-critical data; fast 10 µs byte programming enables real-time logging without interrupting data plane. Use Value: Low 100 µA standby current minimizes power draw during idle periods, extending system uptime in battery-backed or energy-harvested deployments. |
Use Scenario: Storing diagnostic trouble codes (DTCs), sensor calibration tables, and ECU firmware patches in OBD-II modules subjected to automotive thermal cycling and electrical noise. IC Role / Device Role / Timing Role: Main memory block (32K/64K) provides robust, endurance-rated storage for mission-critical vehicle data; hardware VCC sense prevents corruption during cold-crank voltage sag. Use Value: 10,000-cycle endurance and –40°C to +85°C qualification ensure reliable operation over 15-year vehicle lifetimes under harsh under-hood conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF010-55-4C-NHE | 55 ns access, 1 Mbit, 3.3V core (5V tolerant I/O), PLCC-32; lacks boot block lockout and 12V RESET override. | Requires level-shifting for pure 5V systems; no hardware-protected boot region - unsuitable where bootloader immutability is mandated. | Select only if migrating to 3.3V design or when boot protection is handled externally via software/firmware. |
| MX29LV160CBTI-55G | 55 ns access, 16 Mbit (2M × 8), 3.0V–3.6V supply, TSOP-48; includes CFI-compliant boot block but no 12V override. | Higher density and lower voltage incompatible with 5V-only legacy designs; different pinout and package preclude drop-in replacement. | Consider for new 3.3V designs needing larger capacity and industry-standard CFI interface; not a functional substitute for AT49F001T-55JI. |
Compared with SST39VF010-55-4C-NHE and MX29LV160CBTI-55G, the AT49F001T-55JI uniquely delivers 5V-only operation with hardware-enforced boot block security and field-recoverable 12V override - making it irreplaceable in legacy industrial controllers requiring guaranteed bootloader integrity without system redesign.
Availability
AT49F001T-55JI is available at Aetrix Electronics and suitable for industrial automation, embedded bootloader, and telecom equipment applications requiring stable component supply, long-lifecycle support, and guaranteed availability of legacy PLCC-packaged Flash memory.
Supply support for AT49F001T-55JI 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
Microchip Technology acquired Atmel in 2016 and maintains full support for the legacy AT49F series Flash memories, ensuring long-term product availability, documentation, and technical resources.
The AT49F001T-55JI belongs to Atmel's 5V-only Flash memory product line, designed specifically for in-system reprogrammability in cost-sensitive, temperature-rugged embedded systems where simplicity, reliability, and bootloader security are prioritized over high density or low voltage.
FAQ
What is the boot block address range for AT49F001T-55JI?
The boot block for AT49F001T-55JI occupies address range 1C000H to 1FFFFH (16 Kbytes). This differs from the base AT49F001(N) variant, which locates the boot block at 00000H–03FFFH. The upper-address placement isolates boot code from main application memory, enhancing security and simplifying memory management in systems with large firmware footprints.
Does AT49F001T-55JI support 12V programming or only 5V operation?
AT49F001T-55JI is strictly a 5V-only device for all normal read, program, and erase operations. However, applying 12.0V ±0.5V to the RESET pin enables override of the boot block programming lockout feature - this is the sole use case for 12V and does not constitute general programming voltage. Standard operation requires only 5V ±10%.
How is end-of-program detection implemented in AT49F001T-55JI?
AT49F001T-55JI provides two hardware-supported methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and toggle-bit detection (I/O6 toggles between 0 and 1 during operation and stabilizes upon completion). Both allow host software to poll asynchronously without fixed delays, improving system responsiveness and reliability.
What package type is used for AT49F001T-55JI?
AT49F001T-55JI is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC-32), compliant with JEDEC MS-016, Variation AE. Pin 1 is marked by a corner notch; pin 32 is NC (no connect). This surface-mount package offers robust mechanical stability and thermal performance for industrial PCB assemblies.
Can AT49F001T-55JI be used in place of AT49F001-55JI?
No - AT49F001T-55JI and AT49F001-55JI are functionally distinct. The "T" suffix denotes a specific memory map variant with boot block relocated to 1C000H–1FFFFH and modified sector erase addressing. Interchanging them will cause incorrect boot code execution or failed erase/program operations due to mismatched address decoding.
AT49F001T-55JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K 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-PLCC (13.97x11.43)
AT49F001T-55JI FAQ
1.How can I place an order for AT49F001T-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001T-55JI 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 AT49F001T-55JI reliable?
The price and inventory of AT49F001T-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001T-55JI is usually 5 days.
3.What payment methods are accepted for AT49F001T-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001T-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001T-55JI?
AT49F001T-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001T-55JI 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 AT49F001T-55JI?
For technical support, including AT49F001T-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001T-55JI requirements.
6.How does Aetrix verify that AT49F001T-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F001T-55JI 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 AT49F001T-55JI meets industry standards.
7.What is the process for return or replacement of AT49F001T-55JI?
All AT49F001T-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001T-55JI, 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 AT49F001T-55JI part is unused and in its original packaging.
Return procedure for AT49F001T-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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