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Microchip Technology AT49F001AN-55JU
- Part No.:
- AT49F001AN-55JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001AN-55JU.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,876
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Product details
Overview
AT49F001AN-55JU 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 45 ns read access time, 30 µs/byte programming, 3-second chip erase, 10,000 write cycles, and features hardware data protection with boot block lockout for secure firmware storage in industrial control applications.
For engineers reviewing the AT49F001AN-55JU datasheet, AT49F001AN-55JU pinout, AT49F001AN-55JU application, or AT49F001AN-55JU equivalent, this page provides verified technical context, sector architecture details, PLCC-32 package mapping, real-world use scenarios, and validated alternative parts for firmware storage design-in.
Technical Context
The AT49F001AN-55JU implements a sector-based 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 software-triggered chip/sector erase and byte programming without high-voltage inputs.
Hardware protection includes VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and dual-line write inhibit (OE low, CE high, or WE high). The RESET pin is NC on this variant, disabling both reset functionality and boot block lockout override - distinguishing it from T-suffix variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - sufficient for bootloader + configuration data in 8-bit MCU systems. |
| Read Access Time | 55 ns max - compatible with 12–18 MHz bus timing in legacy industrial controllers. |
| Byte Programming Time | 30 µs typical - enables field firmware patching with minimal system interruption. |
| Chip Erase Time | 3 seconds max - allows full reprogramming within tight maintenance windows. |
| Endurance | 10,000 program/erase cycles - supports multi-year field updates in programmable logic controllers. |
| Power Dissipation | 20 mA active / 50 µA CMOS standby - suitable for low-power industrial nodes with battery backup. |
| Operating Voltage | 5.0 V ±10% - eliminates need for auxiliary voltage rails in 5V legacy designs. |
| Temperature Range | –40°C to +85°C - qualified for industrial ambient environments without derating. |
Pinout & Package
AT49F001AN-55JU 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 chamfer; pins are numbered counterclockwise starting from the pin-1 identifier.
| 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 read access - prevents bus contention. |
| OE | Output Enable | Active-low output control; used with CE to gate data outputs during read - enables shared-bus arbitration. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence - enables standard microprocessor timing. |
| I/O0–I/O7 | Data I/O Bus | 8-bit bidirectional data path; supports DATA polling (I/O7 complement) and toggle bit (I/O6) for cycle completion detection. |
| GND | Ground | Signal reference plane; pin 17 in PLCC - requires low-inductance connection to minimize noise during programming. |
| VCC | Power Supply | +5V supply; must exceed 3.8V for programming - internal VCC sense prevents inadvertent writes during brownout. |
| RESET | No Connect (NC) | Pin 1 in PLCC is unconnected - disables reset functionality and boot block lockout override per datasheet note. |
| NC | No Connect | Pin 32 in PLCC is unconnected - must remain floating; not usable as strap or debug pin. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Independent erasure of boot block (16K), two parameter blocks (8K each), and two main blocks (32K/64K) - enables selective firmware updates without full chip erase. |
| Boot Block Lockout | Software-enabled permanent write protection for 00000H–03FFFH region - secures bootloader against accidental overwrite in deployed systems. |
| DATA Polling & Toggle Bit | Real-time program/erase status via I/O7 complement or I/O6 toggling - eliminates need for fixed delay timers in host firmware. |
| Hardware Data Protection | VCC sense, noise filtering, and three-pin inhibit (OE/CE/WE) - prevents spurious writes during power transients or EMI events. |
| 5V-Only Operation | No external 12V required for programming or boot block override - simplifies power design and eliminates HV charge pumps. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Bootloader Memory |
|---|---|
|
Use Scenario: Storing and updating ladder logic firmware in DIN-rail mounted programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage IC providing direct 8-bit parallel interface to Z80 or 8051-class MCUs; operates at 55 ns read timing synchronized to system clock. Use Value: Sector erase enables field updates to I/O module drivers without reloading full application, reducing downtime during maintenance. |
Use Scenario: Hosting secure boot code and hardware initialization routines in medical diagnostic equipment where firmware integrity is critical and field upgrades are infrequent but essential. IC Role / Device Role / Timing Role: Boot memory device mapped to CPU reset vector; boot block lockout ensures bootloader remains unaltered across 10,000+ field updates. Use Value: Hardware-enforced write protection prevents corruption from software bugs or malware, meeting IEC 62304 Class C requirements. |
| Automotive Body Control Module EEPROM Replacement | Point-of-Sale Terminal Configuration Storage |
|
Use Scenario: Replacing serial EEPROM in automotive BCMs for storing calibration tables and feature-enable bits, requiring robustness against load-dump transients and extended temperature cycling. IC Role / Device Role / Timing Role: Parallel Flash memory interfaced via dedicated address/data bus; withstands –40°C to +85°C with <50 µA standby current. Use Value: 5V-only operation avoids level-shifting complexity; 10,000-cycle endurance exceeds vehicle lifetime requirements for reprogramming during recalls. |
Use Scenario: Storing localized language packs, tax rate tables, and peripheral driver configurations in retail POS terminals deployed globally with regional compliance needs. IC Role / Device Role / Timing Role: Field-upgradable nonvolatile memory accessed via ISA or LPC bus; sector architecture allows independent update of tax tables without touching UI firmware. Use Value: 3-second chip erase enables rapid reconfiguration during store setup; PLCC package supports wave-soldering in high-volume manufacturing. |
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 | 3.3V core with 5V I/O tolerance; 55 ns read; no boot block lockout; TSOP-32 package. | Lacks hardware boot protection; requires level translation in pure 5V systems; better suited for new 3.3V designs. | Select if migrating to lower-voltage platforms; avoid for drop-in replacement in legacy 5V-only boards. |
| MX29LV001CTTI-55G | 3.3V supply; 55 ns read; boot block at top (1C000H–1FFFFH); PLCC-32; supports RESET-based lockout override. | Requires 3.3V rail; boot block location differs; RESET pin functional - incompatible with AT49F001AN-55JU's NC RESET. | Choose only when redesigning for 3.3V and needing boot override capability; not pin-compatible due to RESET functionality. |
Compared with AM29LV001BT-55REI and MX29LV001CTTI-55G, the AT49F001AN-55JU uniquely offers 5V-only operation with factory-configured NC RESET and fixed bottom-boot architecture - making it irreplaceable in cost-sensitive, voltage-constrained industrial retrofits where board layout cannot change.
Availability
AT49F001AN-55JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded bootloader memory, and automotive body control module EEPROM replacement requiring stable component supply over extended product lifecycles.
Supply support for AT49F001AN-55JU 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 security ICs for industrial, automotive, and consumer applications.
The AT49F001A(N)(T) family was designed as a 5V-only Flash memory solution for in-system reprogramming of firmware and configuration data in resource-constrained embedded systems with legacy parallel buses.
FAQ
What is the function of the RESET pin on AT49F001AN-55JU?
The RESET pin on AT49F001AN-55JU is a No Connect (NC) terminal per the datasheet - it is unconnected internally and must remain floating. Unlike T-suffix variants, this part lacks reset functionality and boot block lockout override capability, simplifying system design but removing runtime reprogramming safeguards.
Does AT49F001AN-55JU support in-system programming without external high voltage?
Yes, AT49F001AN-55JU supports full in-system programming using only 5V supply - no external 12V is required. All commands (chip erase, sector erase, byte program, lockout enable) are executed via standard microprocessor write cycles to specific address/data sequences, eliminating need for HV charge pumps or dedicated programmers.
What is the boot block address range for AT49F001AN-55JU?
The boot block for AT49F001AN-55JU occupies addresses 00000H to 03FFFH (16K bytes), located at the bottom of the memory map. This fixed bottom-boot architecture differs from T-suffix variants that place the boot block at the top (1C000H–1FFFFH), ensuring compatibility with legacy 8051/Z80 reset vector mappings.
How is end-of-program detection implemented in AT49F001AN-55JU?
AT49F001AN-55JU provides two hardware methods: DATA polling (reading last programmed byte returns complement on I/O7 until complete) and Toggle Bit (I/O6 toggles during programming/erase and stabilizes upon completion). Both operate without external clocks and can be polled at any time during the cycle.
Is AT49F001AN-55JU compatible with standard EPROM socket footprints?
Yes, AT49F001AN-55JU in PLCC-32 package (32J) is pin-compatible with industry-standard 32-pin EPROM sockets such as 27C512, sharing identical pinout for A0–A16, I/O0–I/O7, CE, OE, WE, VCC, and GND - enabling direct replacement in existing designs without PCB modification.
AT49F001AN-55JU 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-55JU FAQ
1.How can I place an order for AT49F001AN-55JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001AN-55JU 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-55JU reliable?
The price and inventory of AT49F001AN-55JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001AN-55JU is usually 5 days.
3.What payment methods are accepted for AT49F001AN-55JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001AN-55JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001AN-55JU?
AT49F001AN-55JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001AN-55JU 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-55JU?
For technical support, including AT49F001AN-55JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001AN-55JU requirements.
6.How does Aetrix verify that AT49F001AN-55JU is sourced from the original manufacturer or authorized distributors?
All AT49F001AN-55JU 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-55JU meets industry standards.
7.What is the process for return or replacement of AT49F001AN-55JU?
All AT49F001AN-55JU units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001AN-55JU, 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-55JU part is unused and in its original packaging.
Return procedure for AT49F001AN-55JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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