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Microchip Technology AT49F001AN-55JI
- Part No.:
- AT49F001AN-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001AN-55JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,117
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Product details
Overview
AT49F001AN-55JI from Atmel is a 1 Mbit (128K × 8) 5V-only in-system reprogrammable Flash memory with 55 ns read access time, 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 AT49F001AN-55JI datasheet, AT49F001AN-55JI pinout, AT49F001AN-55JI application, or AT49F001AN-55JI equivalent, key selection criteria include its PLCC-32 package, 5V single-supply operation, hardware data protection features, and boot-block security for secure boot code retention.
Technical Context
The AT49F001AN-55JI implements a sector-erase Flash architecture with one 16K-byte boot block, two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). Its command interface uses standard CE/OE/WE control lines and supports software-controlled chip erase, sector erase, and byte programming via six-cycle command sequences.
It features DATA polling (I/O7 complement detection) and toggle-bit (I/O6) methods for end-of-program/erase cycle detection, plus hardware safeguards including VCC sense (<3.8V inhibit), noise filtering (<15 ns pulse rejection), and write-inhibit logic (OE low, CE high, or WE high).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - directly maps to 16-bit microcontroller data bus without glue logic. |
| Read Access Time | 55 ns maximum - enables direct interfacing with 12–18 MHz microcontrollers without wait states. |
| Byte Programming Time | 30 µs typical - supports real-time firmware patching in embedded applications with minimal latency. |
| Erase Cycle Time | 3 seconds maximum for full chip erase - allows rapid field updates during maintenance windows. |
| Endurance | 10,000 program/erase cycles - qualifies for long-life industrial control firmware storage. |
| Power Dissipation | 20 mA active current / 50 µA CMOS standby - suitable for low-power battery-backed or energy-conscious systems. |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5V logic families and eliminates need for voltage translators. |
Pinout & Package
AT49F001AN-55JI is housed in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE. Pin 1 is marked by a corner notch; pin 1 is NC (no connect) on this variant.
| 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 control; used with CE to prevent bus contention during shared-memory access. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges for command and programming cycles. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; carries command data, program data, and read outputs; supports DATA polling on I/O7 and toggle-bit on I/O6. |
| VCC | Power Supply | +5V ±10% supply; internal VCC sense disables programming if voltage drops below ~3.8V. |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal logic. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-impedance outputs; not used for boot-lock override (unavailable on AN variant). |
| NC | No Connect | Pin 1 is NC - must be left unconnected; no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Independent erasability of boot block (16K), parameter blocks (2×8K), and main memory (32K+64K) enables selective firmware updates without full reflash. |
| Boot Block Lockout | Hardware-enforced write protection for boot code region (00000H–03FFFH); once enabled, prevents accidental overwrite under 5.5V - critical for system boot integrity. |
| DATA Polling & Toggle Bit | Dual asynchronous status reporting (I/O7 complement and I/O6 toggling) eliminates need for fixed timing delays during programming/erase, simplifying host controller firmware. |
| Hardware Data Protection | VCC sensing, noise filtering, and multi-signal write inhibit (OE/CE/WE) prevent spurious writes during power transients or EMI events. |
| 5V-Only Operation | No external high-voltage programming supply required - reduces BOM count and PCB complexity versus EPROM or older Flash devices. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast random-access reads and field-upgradable sectors; provides deterministic 55 ns read timing for real-time scan cycles. Use Value: Sector erase allows updating application logic without disturbing boot loader or safety-critical startup routines, reducing downtime during firmware revisions. |
Use Scenario: Holding certified boot code and calibration parameters in Class II medical instruments requiring regulatory-compliant firmware integrity and traceability. IC Role / Device Role / Timing Role: Secure boot memory with permanent lockout capability for validated startup sequence; operates reliably over –40°C to +85°C for clinical environment deployment. Use Value: Boot block lockout ensures FDA-submitted boot code remains immutable post-certification, meeting IEC 62304 software lifecycle requirements. |
| Automotive Body Control Module | Legacy Industrial HMI Firmware |
Use Scenario: Storing configurable vehicle settings and diagnostic firmware in body control modules where ECU reprogramming occurs via CAN-based service tools. IC Role / Device Role / Timing Role: In-system reprogrammable Flash memory interfaced via 8-bit parallel bus to 8051 or similar MCU; supports byte-level updates during dealer flash procedures. Use Value: 30 µs/byte programming enables efficient partial updates of feature tables (e.g., lighting profiles), minimizing service time at repair facilities. |
Use Scenario: Replacing obsolete EPROMs in aging human-machine interface panels used in manufacturing equipment with long production lifecycles. IC Role / Device Role / Timing Role: Drop-in 5V-compatible Flash replacement for 27C010 EPROMs; retains identical PLCC-32 footprint and timing interface (CE/OE/WE). Use Value: Eliminates UV erasers and programming sockets while maintaining backward compatibility - reduces maintenance cost and extends legacy system service life. |
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; TSOP-32 package only - no PLCC option. | Requires level-shifting for pure 5V systems; lacks dedicated boot-block lockout command set. | Prefer when migrating to lower-voltage platforms or when TSOP footprint is mandated. |
| MX29LV001CTTI-55G | 5V-only; 55 ns access; 1 Mbit; PLCC-32 available; boot sector is top-aligned (1C000H–1FFFFH), not bottom-aligned like AT49F001AN. | Boot block location differs - requires address remapping in existing designs using bottom-boot layout. | Choose for new designs needing second-source availability; verify boot sector address mapping against bootloader requirements. |
Compared with AM29LV001BT-55REI and MX29LV001CTTI-55G, the AT49F001AN-55JI uniquely offers bottom-aligned 16K boot block (00000H–03FFFH) with explicit lockout enable/disable commands and native PLCC-32 packaging - making it optimal for retrofitting legacy 5V EPROM-based systems without board redesign.
Availability
AT49F001AN-55JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code retention, automotive body control module updates, and legacy HMI firmware replacement requiring stable component supply and long-term obsolescence management.
Supply support for AT49F001AN-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, nonvolatile memory, and secure authentication ICs.
The AT49F001A(N)(T) family was designed for embedded systems requiring field-upgradable firmware storage with robust data integrity, sector-level flexibility, and 5V system compatibility - targeting industrial, medical, and automotive control applications.
FAQ
What is the boot block address range for AT49F001AN-55JI?
The AT49F001AN-55JI uses the bottom-boot configuration: its 16K-byte boot block occupies addresses 00000H to 03FFFH. This is distinct from the AT49F001AT variant, which places the boot block at 1C000H–1FFFFH. The AT49F001AN-55JI's boot block location is fixed and cannot be relocated via configuration bits.
Does AT49F001AN-55JI support RESET-pin-based boot block override?
No. The AT49F001AN-55JI does not support 12V RESET-pin override of the boot block lockout feature. That functionality is explicitly unavailable on the AN variant per the datasheet note: "The RESET feature is not available for the AT49F001AN(T)." Once enabled, boot block protection is permanent under standard 5V operation.
What package type is used for AT49F001AN-55JI?
The AT49F001AN-55JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's ordering information. Pin 1 is marked by a corner notch and is a no-connect (NC) pin - it must remain unconnected in the PCB layout.
How is end-of-program detection implemented in AT49F001AN-55JI?
The AT49F001AN-55JI supports two hardware 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 programming and stops upon completion). Both methods allow the host controller to poll asynchronously without fixed timing loops.
Is AT49F001AN-55JI compatible with standard EPROM socket footprints?
Yes - the AT49F001AN-55JI in PLCC-32 package is pin-compatible with industry-standard 27C010 EPROMs (1 Mbit, 5V) and shares identical DC and AC timing interfaces (CE/OE/WE control, A0–A16 address, I/O0–I/O7 data). No PCB changes are needed for drop-in replacement, though firmware must implement Flash-specific command sequences instead of EPROM programming algorithms.
AT49F001AN-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)
AT49F001AN-55JI FAQ
1.How can I place an order for AT49F001AN-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001AN-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 AT49F001AN-55JI reliable?
The price and inventory of AT49F001AN-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001AN-55JI is usually 5 days.
3.What payment methods are accepted for AT49F001AN-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001AN-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001AN-55JI?
AT49F001AN-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001AN-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 AT49F001AN-55JI?
For technical support, including AT49F001AN-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001AN-55JI requirements.
6.How does Aetrix verify that AT49F001AN-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F001AN-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 AT49F001AN-55JI meets industry standards.
7.What is the process for return or replacement of AT49F001AN-55JI?
All AT49F001AN-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001AN-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 AT49F001AN-55JI part is unused and in its original packaging.
Return procedure for AT49F001AN-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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