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Microchip Technology AT49F001N-55JI
- Part No.:
- AT49F001N-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001N-55JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,048
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Product details
Overview
AT49F001N-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 loaders. It features 55 ns read access time, 10 µs typical byte programming, 10-second chip erase, sector architecture with 16K-byte boot block, and hardware data protection. It operates across –40°C to +85°C industrial temperature range.
For engineers reviewing the AT49F001N-55JI datasheet, AT49F001N-55JI pinout, AT49F001N-55JI application, or AT49F001N-55JI equivalent, key selection considerations include its PLCC-32 industrial-grade packaging, boot-block lockout capability, DATA polling/Toggle Bit end-of-program detection, and compatibility with standard microprocessor bus timing without high-voltage programming signals.
Technical Context
The AT49F001N-55JI implements a command-based architecture using CE/OE/WE control lines identical to EPROM interfaces, enabling drop-in replacement in legacy systems. Its internal logic supports six distinct command sequences-including Chip Erase, Sector Erase, Byte Program, Boot Block Lockout, and Product Identification-latched via address/data patterns on standard write cycles.
Memory organization includes one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). The RESET pin is DC-connected (not functional for reset or override), distinguishing it from the AT49F001T variant where RESET enables boot-block reprogramming at 12 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 55 ns max - enables direct execution from flash (XIP) in systems with ≤18 MHz bus clocks. |
| Byte Programming Time | 10 µs typical - allows rapid field updates of configuration parameters or calibration data. |
| Chip Erase Time | 10 seconds - deterministic, internally timed operation requiring no external timing control or polling overhead. |
| Endurance | 10,000 program/erase cycles - validated for applications requiring infrequent but reliable firmware upgrades over product lifetime. |
| Power Dissipation | 275 mW active (50 mA @ 5 V), 100 µA CMOS standby - suitable for low-power industrial control and battery-backed systems. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives, PLCs, and instrumentation. |
Pinout & Package
AT49F001N-55JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE, with pin 1 identifier and 1.27 mm pitch. Pin 1 is designated by a corner chamfer and corresponds to A7 in the top-view pinout.
| 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 without decoding. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8-bit microcontrollers; supports true read/write data transfer without direction control pins. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - prevents bus contention in shared-memory systems. |
| OE | Output Enable | Active-low output gate; used with CE to control data bus assertion - enables flexible timing control during burst reads. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge for command entry and byte programming - eliminates need for separate write clock. |
| RESET | DC Input (No Function) | Pin 9 in PLCC; labeled "DC" (Don't Connect) per datasheet - not connected internally and must be left floating or tied to VCC/GND per board layout rules. |
| VCC | Power Supply | +5 V ±10% supply; powers all internal logic and charge pumps - requires local 0.1 µF ceramic decoupling adjacent to pin. |
| GND | Ground Reference | Signal and power ground return; must be low-impedance connection to minimize noise coupling during programming cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | Enables permanent protection of boot code (00000H–03FFFH) while allowing runtime updates to parameter and application memory - critical for secure firmware boot integrity. |
| DATA Polling & Toggle Bit Detection | Allows software-driven confirmation of programming/erase completion without fixed delays - reduces CPU wait states and improves system responsiveness. |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks writes) prevent accidental corruption during power transients. |
| 5V-Only Operation | Eliminates need for 12 V or 21 V programming supplies - simplifies power design and enables in-system reprogramming via standard logic-level signals. |
| Industrial Temperature Range | Rated for –40°C to +85°C operation with guaranteed 55 ns access time - ensures timing compliance in extended-temperature industrial deployments. |
Applications
| Industrial PLC Firmware Storage | Embedded Controller Boot Memory |
|---|---|
Use Scenario: Storing boot loader and firmware images in programmable logic controllers deployed in factory automation cabinets with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing XIP-capable instruction fetch with 55 ns latency to meet real-time scan cycle deadlines. Use Value: Boot block lockout prevents unauthorized modification of safety-critical startup code while permitting field-upgradable application logic in main memory blocks. |
Use Scenario: Serving as primary code storage for 8-bit microcontrollers in HVAC control units exposed to automotive-grade thermal cycling. IC Role / Device Role / Timing Role: Standalone Flash memory interfaced directly to MCU address/data bus; replaces masked ROM for post-production firmware tuning. Use Value: 10,000-cycle endurance and 10 µs byte programming enable calibration data updates during manufacturing test and service recalibration. |
| Medical Device Configuration Storage | Point-of-Sale Terminal Parameter Memory |
Use Scenario: Retaining device-specific calibration coefficients and regulatory compliance settings in portable diagnostic equipment requiring long-term data retention. IC Role / Device Role / Timing Role: Parameter block storage (two 8K-byte sections) accessed via standard read cycles during device initialization. Use Value: Hardware data protection (VCC sense, noise filtering) ensures configuration integrity during brown-out conditions common in battery-operated medical devices. |
Use Scenario: Holding localized language packs, tax tables, and peripheral driver configurations in retail terminals operating continuously in commercial environments. IC Role / Device Role / Timing Role: Field-updatable memory partitioned into main memory blocks (32K/64K) for versioned firmware and parameter blocks for region-specific data. Use Value: Sector erase capability allows independent updating of tax tables without erasing full firmware - minimizing downtime during regulatory updates. |
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, 3.3 V core (5 V tolerant I/O), PLCC-32; lacks boot block lockout and RESET pin functionality. | Requires level-shifting for pure 5 V systems; no hardware-protected boot sector - relies on software-only protection schemes. | Select when migrating to lower-voltage systems or when boot security is managed externally. |
| MX29LV160BTC-55G | 55 ns access, 16 Mbit density, 3 V supply, TSOP-48; includes CFI-compliant command set and wider voltage tolerance (2.7–3.6 V). | Higher density and modern package; incompatible pinout and voltage domain - not a drop-in replacement. | Select for new designs prioritizing scalability and industry-standard CFI interface over legacy 5 V compatibility. |
Compared with SST39VF010-55-4C-NHE and MX29LV160BTC-55G, the AT49F001N-55JI provides unique 5 V-only operation with hardware-enforced boot block protection and PLCC-32 industrial packaging - making it irreplaceable in legacy 5 V controller upgrades where physical and electrical compatibility are mandatory.
Availability
AT49F001N-55JI is available at Aetrix Electronics and suitable for industrial PLCs, embedded controller boot memory, medical device configuration storage, and point-of-sale terminal parameter memory requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT49F001N-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 AT49F001 family of parallel Flash memories, emphasizing reliability, longevity, and industrial qualification.
The AT49F001 series was designed specifically for 5 V embedded systems requiring in-system reprogrammability without high-voltage programming circuitry - targeting industrial control, instrumentation, and legacy microcontroller platforms.
FAQ
What is the operating temperature range for the AT49F001N-55JI?
The AT49F001N-55JI is rated for industrial operation from –40°C to +85°C. This range is validated across all specified DC and AC parameters, including the 55 ns read access time and 10 µs byte programming performance. The "I" suffix in the part number explicitly denotes industrial temperature qualification, distinguishing it from commercial-grade variants like AT49F001N-55JC.
Does the AT49F001N-55JI support hardware boot block protection?
Yes, the AT49F001N-55JI supports hardware-enforced boot block programming lockout for its 16K-byte boot sector (00000H–03FFFH). Once enabled via the documented six-cycle command sequence, the boot block becomes permanently write-protected under standard 5 V operation. This feature is implemented in silicon and does not rely on software flags or fuse bits.
What package type is used for the AT49F001N-55JI?
The AT49F001N-55JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's ordering information. It conforms to JEDEC standard MS-016, Variation AE, with a 1.27 mm lead pitch and pin 1 identified by a corner chamfer. Pin 9 is a DC (Don't Connect) terminal and must remain unconnected.
Can the AT49F001N-55JI be programmed using standard microprocessor write cycles?
Yes, the AT49F001N-55JI is programmed exclusively using standard 5 V microprocessor write cycles - no external high-voltage programming signals are required. All operations (byte program, sector erase, chip erase, lockout enable) are initiated by specific address/data command sequences latched on CE or WE edges, fully compatible with 8051, Z80, and 68K bus protocols.
How is end-of-program detection implemented in the AT49F001N-55JI?
The AT49F001N-55JI provides two hardware-supported end-of-program detection methods: DATA polling (I/O7 complements last loaded byte until completion) and Toggle Bit (I/O6 toggles during operation and stabilizes upon completion). Both methods allow the host processor to poll asynchronously without fixed timing delays, reducing firmware overhead and improving system efficiency.
AT49F001N-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)
AT49F001N-55JI FAQ
1.How can I place an order for AT49F001N-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001N-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 AT49F001N-55JI reliable?
The price and inventory of AT49F001N-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001N-55JI is usually 5 days.
3.What payment methods are accepted for AT49F001N-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001N-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001N-55JI?
AT49F001N-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001N-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 AT49F001N-55JI?
For technical support, including AT49F001N-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001N-55JI requirements.
6.How does Aetrix verify that AT49F001N-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F001N-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 AT49F001N-55JI meets industry standards.
7.What is the process for return or replacement of AT49F001N-55JI?
All AT49F001N-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001N-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 AT49F001N-55JI part is unused and in its original packaging.
Return procedure for AT49F001N-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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