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Microchip Technology AT49F001AT-55JI
- Part No.:
- AT49F001AT-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001AT-55JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001AT-55JI from Atmel is a 1 Mbit (128K × 8) 5V-only in-system reprogrammable Flash memory with 55 ns read access time, 3-second chip erase cycle, 30 µs/byte programming, and sector-based architecture including a 16K-byte boot block with programmable lockout. It operates across the industrial temperature range (–40°C to +85°C) and is used in embedded firmware storage for microcontroller-based systems requiring field-upgradable code.
For engineers reviewing the AT49F001AT-55JI datasheet, AT49F001AT-55JI pinout, AT49F001AT-55JI application, or AT49F001AT-55JI equivalent, this device delivers deterministic timing for legacy 8-bit bus interfaces, hardware data protection against inadvertent writes, and boot-sector integrity control-critical for secure bootloader implementations in industrial controllers and telecom edge devices.
Technical Context
The AT49F001AT-55JI implements a standard parallel Flash interface with CE/OE/WE control logic and supports software command sequences for sector erase, chip erase, byte programming, and boot block lockout enable/disable. Its internal program control logic eliminates external high-voltage circuitry, enabling true 5V-only operation.
Memory organization is fixed at 131,072 words × 8 bits, partitioned into one 16K-byte boot block (address range 1C000H–1FFFFH), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). The RESET pin enables boot block override at 12V, but only on T-suffix variants-not AN(T) variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), directly maps to 128KB firmware image storage |
| Read Access Time | 55 ns max - ensures compatibility with 12–18 MHz 8-bit microcontrollers without wait states |
| Byte Programming Time | 30 µs typical - enables rapid field updates of small configuration or calibration data |
| Chip Erase Time | 3 seconds max - allows full firmware replacement within tight maintenance windows |
| Endurance | 10,000 write/erase cycles - supports multi-year field upgrade cycles in deployed equipment |
| Operating Voltage | 5.0 V ±10% - eliminates need for auxiliary voltage rails in legacy 5V system designs |
| Standby Current | 50 µA CMOS - enables low-power retention during system sleep modes |
Pinout & Package
AT49F001AT-55JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 compliant, with 1.27 mm pitch and body size 12.45 × 14.95 mm. Pin 1 identifier is a corner chamfer; pins are arranged in counter-clockwise order starting from top-left when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 131K-word addressing; A11–A16 are don't-care in some command cycles |
| 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 gate; controls data bus drive to prevent contention during shared-bus operation |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming |
| RESET | Reset / Boot Override | Logic-high = normal operation; 12V pulse enables boot block reprogramming even when lockout is active |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; supports DATA polling (I/O7) and toggle bit (I/O6) for program/erase status detection |
| VCC | Power Supply | +5V supply; internal voltage sensing disables programming if VCC drops below ~3.8V |
| GND | Ground | Reference for all I/O and power pins; decoupling required per JEDEC PLCC layout guidelines |
| NC | No Connect | Pin 32 (PLCC) is unconnected; must remain floating or tied to GND per design rules |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot block (1C000H–1FFFFH) can be permanently write-protected via software command, securing bootloader code |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibit (OE low/CE high/WE high) prevent accidental writes |
| DATA Polling & Toggle Bit | I/O7 complement indicates programming progress; I/O6 toggling signals erase/program completion-no external timer needed |
| 5V-Only Reprogrammability | No external 12V programming voltage required; all commands executed using standard 5V logic levels |
| Industrial Temperature Range | Specified for –40°C to +85°C case temperature, validated for use in enclosed industrial enclosures without forced cooling |
Applications
| Industrial PLC Firmware Storage | Telecom Line Card Bootloader |
|---|---|
|
Use Scenario: Storing firmware images and configuration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with deterministic 55 ns read latency, interfaced directly to 8051 or Z80-derived microcontrollers via parallel bus. Use Value: Sector erase capability allows independent update of application code while preserving boot loader integrity; 10,000-cycle endurance supports >5 years of scheduled field upgrades. |
Use Scenario: Hosting secure boot code and field-upgradable DSP firmware on carrier-grade DSLAM line cards operating in central office cabinets. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector; RESET pin used for 12V-activated boot block reprogramming during service interventions. Use Value: Boot block lockout prevents corruption of critical startup routines during remote firmware pushes; 50 µA standby current minimizes thermal load in densely packed line card chassis. |
| Medical Diagnostic Equipment BIOS | Automotive Body Control Module |
|
Use Scenario: Storing calibrated sensor initialization parameters and safety-critical boot routines in portable ultrasound and ECG devices. IC Role / Device Role / Timing Role: Firmware storage with hardware write protection; accessed during cold start before OS loads, requiring guaranteed read timing under battery brownout conditions. Use Value: VCC sense circuitry inhibits writes below 3.8V, preventing partial programming during power-up/down transients; industrial temp rating covers extended operation in non-climate-controlled clinical settings. |
Use Scenario: Holding vehicle-specific configuration data and low-level CAN protocol stacks in body control modules subjected to automotive thermal cycling. IC Role / Device Role / Timing Role: Parameter block (8K × 2) stores trim values and feature-enable flags; main memory blocks hold application firmware updated via dealer diagnostic tools. Use Value: Independent sector erase enables selective reprogramming of calibration data without disturbing core firmware; 3-second chip erase meets OEM flash tooling time budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001BT-55REI | 3V core with 5V I/O tolerance; 55 ns access; 1 Mbit density; no RESET-based boot override | Lacks 12V RESET override for boot block; requires level-shifting in pure 5V systems | Choose for lower active power (15 mA vs. 20 mA) and extended voltage flexibility where boot override is unused |
| MX29LV001CTTI-55G | 3V-only operation; 55 ns access; same 1 Mbit density; boot block at 00000H–03FFFH (not top-aligned) | Boot block location differs (bottom vs. top); incompatible command set for lockout/override | Choose only if redesigning PCB to accommodate 3V supply and revised address decoding for bottom-boot architecture |
Compared with AM29LV001BT-55REI and MX29LV001CTTI-55G, the AT49F001AT-55JI provides unique top-aligned boot block addressing (1C000H–1FFFFH) and hardware-enabled 12V RESET override-enabling secure, field-serviceable bootloader updates without firmware changes or PCB modifications.
Availability
AT49F001AT-55JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, telecom line card bootloaders, medical diagnostic BIOS, and automotive body control module applications requiring stable component supply and long-term lifecycle support.
Supply support for AT49F001AT-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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for embedded systems.
The AT49F001A(T) series was designed as a drop-in replacement for EPROMs in legacy 5V systems, delivering in-system reprogrammability without requiring high-voltage programming infrastructure.
FAQ
What is the boot block address range for AT49F001AT-55JI?
The AT49F001AT-55JI has its 16K-byte boot block located at address range 1C000H to 1FFFFH (top-aligned), distinct from the AT49F001A(N) variant which places it at 00000H–03FFFH. This top alignment simplifies memory mapping for reset vector execution in many 8-bit microcontroller designs. The AT49F001AT-55JI datasheet confirms this range in Section 4 and the Block Diagram.
Does AT49F001AT-55JI support 12V RESET-based boot block override?
Yes, the AT49F001AT-55JI supports 12V ±0.5V applied to the RESET pin to temporarily disable boot block lockout and allow reprogramming-even after lockout has been enabled. This feature is explicitly documented for T-suffix variants in the "Boot Block Programming Lockout Override" section and is not available on AN(T) variants. The AT49F001AT-55JI's RESET pin functionality is confirmed in the Absolute Maximum Ratings and Operating Modes tables.
What package type is used for AT49F001AT-55JI?
The AT49F001AT-55JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's ordering information table. Its dimensions (12.45 × 14.95 mm body, 1.27 mm lead pitch) comply with JEDEC MS-016, Variation AE. Pin 1 is identified by a corner chamfer, and pin 32 is NC-verified in the PLCC mechanical drawing and Pin Configurations diagram.
How does AT49F001AT-55JI detect end-of-program without external timing?
The AT49F001AT-55JI provides two hardware methods: DATA polling (I/O7 returns complement of written data until completion, then true data) and Toggle Bit (I/O6 toggles during programming/erasing and stops when complete). Both are usable at any time during the cycle and eliminate need for fixed delay timers. These mechanisms are specified in the AC Characteristics and Waveforms sections of the AT49F001AT-55JI datasheet.
Is AT49F001AT-55JI compatible with standard EPROM socket footprints?
Yes-the AT49F001AT-55JI uses identical pinout, voltage levels, and read timing (CE/OE/WE control) as industry-standard 27C010 EPROMs, making it a functional drop-in replacement in existing sockets. However, write operations require software command sequences instead of high-voltage pulses, so host firmware must be updated to issue proper unlock/program commands. This compatibility is confirmed in the "READ" and "Device Operation" sections of the AT49F001AT-55JI documentation.
AT49F001AT-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)
AT49F001AT-55JI FAQ
1.How can I place an order for AT49F001AT-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001AT-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 AT49F001AT-55JI reliable?
The price and inventory of AT49F001AT-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001AT-55JI is usually 5 days.
3.What payment methods are accepted for AT49F001AT-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001AT-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001AT-55JI?
AT49F001AT-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001AT-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 AT49F001AT-55JI?
For technical support, including AT49F001AT-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001AT-55JI requirements.
6.How does Aetrix verify that AT49F001AT-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F001AT-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 AT49F001AT-55JI meets industry standards.
7.What is the process for return or replacement of AT49F001AT-55JI?
All AT49F001AT-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001AT-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 AT49F001AT-55JI part is unused and in its original packaging.
Return procedure for AT49F001AT-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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