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Microchip Technology AT49F001A-55JI
- Part No.:
- AT49F001A-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001A-55JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001A-55JI from Atmel is a 1 Mbit (128K × 8) 5V-only in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 55 ns read access time, 30 µs/byte programming, 3-second chip erase, 10,000 write cycles, and hardware data protection - enabling reliable firmware updates in industrial control and boot loader applications.
For engineers reviewing the AT49F001A-55JI datasheet, AT49F001A-55JI pinout, AT49F001A-55JI application, or AT49F001A-55JI equivalent, this page provides verified technical context, sector architecture details, boot block lockout behavior, PLCC-32 package mapping, and real-world design implications for system-level reprogramming and data integrity.
Technical Context
The AT49F001A-55JI implements a sector-organized Flash architecture with one 16K-byte boot block (address range 00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (32K + 64K bytes). Its command-set-driven operation uses standard CE/OE/WE controls and supports hardware reset-based boot block override at 12 V.
It features dual end-of-operation detection via DATA polling (I/O7 complement → true data) and Toggle Bit (I/O6 toggling → stable), both usable during byte programming or sector/chip erase. Internal program control eliminates external timing components, and VCC sense (<3.8 V) plus noise filtering (<15 ns pulses rejected) enforce robust hardware data protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - sufficient for full boot code + configuration data in 8-bit MCU systems. |
| Read Access Time | 55 ns max - enables direct execution from Flash (XIP) in systems with ≤18 MHz bus timing. |
| Byte Programming Time | 30 µs typical - allows rapid field updates of small firmware patches without system downtime. |
| Chip Erase Time | 3 seconds max - supports fast factory or field reprogramming of entire memory space. |
| Endurance | 10,000 program/erase cycles - validated for long-term use in industrial logging or configuration storage. |
| Power Dissipation | 20 mA active / 50 µA CMOS standby - suitable for low-power embedded systems with sleep/wake cycles. |
| Operating Voltage | 5.0 V ±10% - single-supply compatibility with legacy 5V logic and microcontrollers. |
Pinout & Package
AT49F001A-55JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 compliant, with 12.3–12.6 mm × 14.9–15.1 mm footprint and 1.27 mm lead pitch. Pin 1 identifier is a corner chamfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A11 is don't-care in 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 on falling/rising edges per command cycle timing. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; carries command data, product ID codes, and memory contents. |
| RESET | Reset Input | Active-low reset; at 12 V enables boot block override - not available on AN/T variants. |
| NC | No Connect | Pin 1 in PLCC is NC for AT49F001AN(T); not bonded - must be left floating or tied to ground per layout rules. |
| VCC / GND | Power Supply | 5 V supply and ground pins; decoupling required within 10 mm of VCC pin for stable read/write margins. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot sector (00000H–03FFFH) can be permanently write-protected via command sequence - ensures bootloader integrity across firmware updates. |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulse rejection), and control-line interlock (OE low/CE high/WE high blocks writes) prevent accidental corruption. |
| Two End-of-Operation Detection Methods | DATA polling (I/O7 complement → true data) and Toggle Bit (I/O6 toggling → stable) allow flexible, non-blocking host software synchronization. |
| 12 V RESET Override | Applying 12 V ±0.5 V to RESET pin unlocks protected boot block for chip/sector erase or byte programming - critical for recovery after lockout activation. |
| Standard Microprocessor Interface | Uses CE/OE/WE control signals identical to EPROMs - enables drop-in replacement in existing 5V memory designs without logic redesign. |
Applications
| Industrial PLC Firmware Storage | Embedded Boot Loader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in harsh industrial environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile code storage IC providing XIP-capable read access and in-system reprogrammability via RS-485 or CAN-based update protocols. Use Value: 55 ns access time enables deterministic instruction fetch; 10,000-cycle endurance supports decades of field firmware revisions without hardware replacement. |
Use Scenario: Hosting secure boot code that initializes CPU, configures peripherals, and validates application image checksums before execution. IC Role / Device Role / Timing Role: Boot block-protected Flash memory ensuring immutable first-stage bootloader while allowing dynamic update of application partition. Use Value: Boot block lockout prevents accidental overwrites; 12 V RESET override enables emergency recovery - eliminating need for external programmers in deployed systems. |
| Legacy 5V Microcontroller Upgrade | Parameter Configuration Storage |
Use Scenario: Replacing obsolete EPROMs (e.g., 27C010) in legacy 8051 or Z80-based instrumentation with in-system reprogrammable Flash. IC Role / Device Role / Timing Role: Pin-compatible 5V Flash memory using identical CE/OE/WE timing and address/data bus interface. Use Value: Eliminates UV erasers and socket programming; 30 µs/byte programming enables quick calibration data patching during production test. |
Use Scenario: Retaining user-configurable settings (e.g., sensor calibration offsets, communication baud rates) across power cycles in medical diagnostic equipment. IC Role / Device Role / Timing Role: Parameter block (8K × 2) Flash storage accessed via dedicated sector erase - isolating config data from main firmware updates. Use Value: Independent 8K-byte parameter blocks allow atomic, wear-leveled updates without disturbing boot or application code - enhancing data reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001MT-55REI | 3V core with 5V I/O tolerant; 55 ns access; 100K endurance; no boot block lockout. | Requires level-shifting in pure 5V systems; lacks hardware-protected boot sector. | Choose when migrating to lower-voltage systems or when boot block protection is unnecessary. |
| SST39VF010-55-4C-NHE | 3.3V only; 55 ns access; 100K endurance; top-boot sector (16K) with software lock. | Not 5V compatible; different sector map (top-boot vs. bottom-boot); no 12 V override. | Prefer for new 3.3V designs where higher endurance and smaller voltage margin are acceptable trade-offs. |
Compared with AM29LV001MT-55REI and SST39VF010-55-4C-NHE, the AT49F001A-55JI uniquely combines 5V-only operation, bottom-boot architecture with hardware-enforced lockout, and 12 V RESET override - making it irreplaceable in legacy 5V industrial systems requiring guaranteed bootloader integrity and field recovery capability.
Availability
AT49F001A-55JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded boot loader memory, legacy 5V microcontroller upgrades, parameter configuration storage, and secure code retention requiring stable component supply across extended product lifecycles.
Supply support for AT49F001A-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 devices for industrial, automotive, and consumer applications.
The AT49F001A-55JI belongs to Atmel's early-generation 5V Flash memory product line, designed specifically for in-system reprogrammability in legacy 5V embedded systems requiring robust boot code protection and field-upgradable firmware.
FAQ
What is the boot block address range for AT49F001A-55JI?
The AT49F001A-55JI uses the AT49F001A(N) variant addressing scheme, with its 16K-byte boot block located at 00000H–03FFFH. This bottom-boot configuration places critical startup code at the lowest memory addresses, aligning with standard 8051 and Z80 reset vector expectations. The AT49F001A-55JI does not use the top-boot (1C000H–1FFFFH) map reserved for AT49F001A(T) variants.
Does AT49F001A-55JI support 12 V RESET override for boot block reprogramming?
Yes, AT49F001A-55JI supports 12 V ±0.5 V applied to the RESET pin to temporarily disable boot block programming lockout. This feature allows chip erase, sector erase, or byte programming of the protected boot sector - a critical recovery mechanism absent in AT49F001AN(T) variants. The override is active only while 12 V is present; lockout re-engages when RESET returns to TTL levels.
How does hardware data protection work in AT49F001A-55JI?
AT49F001A-55JI implements three hardware protections: (1) VCC sense circuitry disables programming if supply drops below ~3.8 V; (2) any of OE low, CE high, or WE high inhibits write cycles; and (3) input noise filter rejects pulses <15 ns on WE/CE. These features collectively prevent spurious writes during power transients, bus contention, or EMI events - ensuring data integrity without software overhead.
What package type is used for AT49F001A-55JI?
AT49F001A-55JI uses the 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated as "32J" in Atmel's ordering nomenclature. Its dimensions are 12.3–12.6 mm × 14.9–15.1 mm with 1.27 mm lead pitch and JEDEC MS-016, Variation AE compliance. Pin 1 is identified by a corner chamfer, and the package is rated for industrial temperature range (-40°C to +85°C).
Can AT49F001A-55JI be used as a direct replacement for EPROMs like 27C010?
Yes, AT49F001A-55JI is designed as a functional and pin-compatible replacement for 1 Mbit EPROMs such as the 27C010 in 5V systems. It uses identical CE/OE/WE control signaling, same 32-pin PLCC footprint, and EPROM-like read timing. Unlike EPROMs, it requires no UV erasure and supports in-circuit byte programming - enabling field updates without removing the device from the board.
AT49F001A-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)
AT49F001A-55JI FAQ
1.How can I place an order for AT49F001A-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001A-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 AT49F001A-55JI reliable?
The price and inventory of AT49F001A-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001A-55JI is usually 5 days.
3.What payment methods are accepted for AT49F001A-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001A-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001A-55JI?
AT49F001A-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001A-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 AT49F001A-55JI?
For technical support, including AT49F001A-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001A-55JI requirements.
6.How does Aetrix verify that AT49F001A-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F001A-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 AT49F001A-55JI meets industry standards.
7.What is the process for return or replacement of AT49F001A-55JI?
All AT49F001A-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001A-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 AT49F001A-55JI part is unused and in its original packaging.
Return procedure for AT49F001A-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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