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Microchip Technology AT49F001-55JI
- Part No.:
- AT49F001-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001-55JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001-55JI 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 delivers 55 ns read access time, 10 µs typical byte programming, 10-second chip erase, 10,000 write cycles, and hardware data protection - enabling reliable firmware updates in industrial temperature environments (–40°C to +85°C).
For engineers reviewing the AT49F001-55JI datasheet, AT49F001-55JI pinout, AT49F001-55JI application, or AT49F001-55JI equivalent, key selection criteria include its PLCC-32 industrial-grade packaging, sector-based architecture with 16KB boot block lockout, DATA polling/Toggle Bit end-of-program detection, and 5V-only command interface eliminating high-voltage programming circuitry.
Technical Context
The AT49F001-55JI implements a standard parallel Flash interface with CE/OE/WE control logic and supports full-chip and sector-erase operations via six-cycle software command sequences. Its internal program controller manages timing for byte programming (tBP = 10–50 µs) and erase (tEC = 10 s), with automatic pulse generation and no external clocks required.
It features dual-mode operation: standard read mode (CE/OE low, WE high) and command mode triggered by specific address/data sequences on falling/rising edges of CE or WE. The RESET pin enables system-level reset and - uniquely in the AT49F001(T) variant - 12V override for boot block reprogramming, though this function is disabled in the AT49F001N(T) variant (which includes AT49F001-55JI).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - sufficient for boot code, configuration tables, and firmware images in microcontroller-based systems. |
| Read Access Time | 55 ns max - enables direct execution from Flash (XIP) in timing-critical embedded applications without wait states at 18 MHz bus speeds. |
| Byte Programming Time | 10 µs typical - allows rapid field updates of small data segments without blocking system operation for extended periods. |
| Erase Cycle Time | 10 seconds max for full chip erase - deterministic timing simplifies host firmware timeout handling during firmware recovery sequences. |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delays or external status monitoring hardware. |
| Write Endurance | 10,000 program/erase cycles - validated for long-term use in industrial logging, calibration storage, and infrequent firmware upgrades. |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, motor drives, and outdoor communications equipment without derating. |
| Power Dissipation | 275 mW active (50 mA @ 5V), 100 µA CMOS standby - supports low-power modes in battery-backed or energy-constrained systems. |
Pinout & Package
AT49F001-55JI is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC-32), JEDEC MS-016 compliant, with lead coplanarity ≤ 0.102 mm and body dimensions 12.47 × 14.99 mm (max). Pin 1 identifier is a beveled corner; pins are J-leaded with 1.27 mm pitch.
| 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 0x00000–0x1FFFF. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface for read data output and program data input; compatible with standard microprocessor data buses. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; controls device activation in multi-chip memory systems. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, preventing bus contention during shared-memory transfers. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command sequences; inhibits writes if held high. |
| RESET | Reset Input | Active-low system reset; halts ongoing program/erase and forces outputs to high-Z; not functional for boot block override in AT49F001N(T) variants like AT49F001-55JI. |
| VCC | Power Supply | +5.0 V ±10% supply; powers core logic and I/O buffers; internal voltage sensing disables programming if VCC < 3.8 V. |
| GND | Ground Reference | Signal and power return path; decoupling capacitor (0.1 µF) required within 10 mm of VCC/GND pins per datasheet layout guidelines. |
| NC | No Connect | Pin 32 in PLCC package - internally unconnected; must remain floating per datasheet; not to be tied to VCC, GND, or signals. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16 KB boot block (0x1C000–0x1FFFF) programmable lockout prevents accidental overwrite of critical startup code - essential for fail-safe bootloader integrity. |
| 5V-Only Reprogramming | Eliminates need for +12 V programming supplies or charge pumps; reduces BOM count and PCB complexity in cost-sensitive industrial designs. |
| Hardware Data Protection | VCC sense (<3.8 V inhibits write), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low / CE high / WE high blocks programming) prevent spurious writes. |
| DATA Polling & Toggle Bit | Two independent, software-accessible methods to detect program/erase completion - enables robust host firmware without hardware status lines or timers. |
| Industrial Temperature Range | –40°C to +85°C operation with guaranteed 55 ns access and 100 µA standby current - suitable for DIN-rail PLCs, HVAC controllers, and factory automation nodes. |
Applications
| Industrial PLC Firmware Storage | Embedded Boot Loader Memory |
|---|---|
Use Scenario: Storing ladder logic programs and I/O configuration tables in programmable logic controllers deployed in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage IC providing direct-read execution capability and in-system reprogrammability via RS-485 or CAN-based update protocols. Use Value: 55 ns access ensures deterministic scan cycle timing; 10,000 write cycles support decades of field firmware revisions without hardware replacement. |
Use Scenario: Holding secure boot code and cryptographic keys in microcontroller-based edge gateways requiring tamper-resistant startup sequence execution. IC Role / Device Role / Timing Role: Boot block-protected Flash memory ensuring first-instruction fetch integrity while allowing runtime parameter updates in main memory sectors. Use Value: Boot block lockout (enabled via 6-byte command sequence) prevents corruption of verified startup routines during OTA updates to application firmware. |
| Medical Device Configuration Storage | Automotive Diagnostic Module Memory |
Use Scenario: Retaining calibrated sensor offsets, user preferences, and regulatory audit logs in portable ultrasound or infusion pump systems requiring long-term data retention. IC Role / Device Role / Timing Role: Parameter block Flash memory (two 8 KB sectors) used for field-updatable calibration data with hardware write protection. Use Value: Sector-erase independence allows updating calibration tables without erasing boot code or application binaries - minimizing downtime during service events. |
Use Scenario: Storing OBD-II diagnostic firmware and vehicle-specific adaptation data in aftermarket scan tools operating across multiple vehicle platforms. IC Role / Device Role / Timing Role: Field-reprogrammable Flash IC interfacing with 8-bit/16-bit microcontrollers via standard parallel bus for rapid firmware patch deployment. Use Value: 5V-only operation simplifies power design; 10-second erase time enables sub-minute firmware updates during dealership service procedures. |
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 | 512 Kbit (64K × 8), 55 ns access, 3.3 V operation - half the density and lower voltage; no boot block lockout. | Not suitable for 1 Mbit boot image storage; requires level-shifting for 5 V systems; lacks dedicated protected boot sector. | Select only if system uses 3.3 V I/O and firmware size ≤ 64 KB; verify voltage compatibility before substitution. |
| MX29LV010TC-55G | 1 Mbit (128K × 8), 55 ns, 3.0–3.6 V operation; includes CFI query support but no hardware RESET pin or boot lockout command set. | Requires external 3.3 V regulator; lacks AT49F001-55JI's industrial-temp PLCC-32 package and boot block security feature. | Prefer for cost-sensitive 3.3 V designs where boot protection is handled in software; avoid in legacy 5 V bus systems. |
Compared with SST39VF010-55-4C-NHE and MX29LV010TC-55G, the AT49F001-55JI provides full 5 V compatibility, integrated boot block lockout, and industrial-grade PLCC packaging - making it uniquely suited for retrofitting and long-lifecycle 5 V embedded systems requiring hardware-enforced firmware integrity.
Availability
AT49F001-55JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded boot loader memory, and medical device configuration storage requiring stable component supply across extended product lifecycles.
Supply support for AT49F001-55JI 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, including datasheets, errata, and long-term manufacturing commitments for industrial-grade variants.
The AT49F001 product line was designed specifically for 5 V embedded systems needing in-system reprogrammable nonvolatile memory with hardware-based data protection and sector-level erase flexibility - targeting industrial control, instrumentation, and legacy microcontroller platforms.
FAQ
What is the operating temperature range for the AT49F001-55JI?
The AT49F001-55JI is rated for industrial operation from –40°C to +85°C. This range is validated across all electrical specifications including 55 ns read access time, 100 µA standby current, and reliable byte programming performance - making it suitable for deployment in harsh environments such as factory floors, outdoor telecom cabinets, and automotive under-hood modules where thermal cycling occurs.
Does the AT49F001-55JI support boot block protection, and how is it enabled?
Yes, the AT49F001-55JI supports boot block programming lockout for its 16 KB boot sector (address range 0x1C000–0x1FFFF). It is enabled via a six-cycle software command sequence: load 0xAA to address 0x5555, 0x55 to 0x2AAA, 0x80 to 0x5555, then 0xAA/0x55/0x40 to 0x5555. Once activated, the boot block cannot be erased or programmed at ≤5.5 V - ensuring bootloader integrity in field-deployed systems.
What package type is used for the AT49F001-55JI, and what are its key mechanical features?
The AT49F001-55JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC-32) package, JEDEC MS-016 compliant. Key features include J-leads with 1.27 mm pitch, body size 12.47 × 14.99 mm (max), lead coplanarity ≤ 0.102 mm, and pin 1 identified by a beveled corner. This surface-mount package offers robust thermal and mechanical reliability for reflow-soldered industrial PCBs.
How does the AT49F001-55JI indicate completion of a byte programming cycle?
The AT49F001-55JI provides two hardware-supported methods: DATA polling (reading the programmed byte returns complemented data on I/O7 until completion, then true data) and Toggle Bit (I/O6 toggles between 0 and 1 during programming and stops upon completion). Both methods allow host firmware to poll asynchronously without fixed delays - critical for deterministic real-time update sequences in the AT49F001-55JI.
Is the RESET pin on the AT49F001-55JI functional for boot block override?
No. The RESET pin on the AT49F001-55JI - as an AT49F001N(T) variant - supports only standard system reset functionality (halting operations and forcing outputs to high-Z). The 12 V boot block override feature is explicitly disabled in AT49F001N(T) devices per the datasheet; it is available only on AT49F001(T) variants. Therefore, AT49F001-55JI boot block protection is irreversible under normal 5 V operation.
AT49F001-55JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- 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)
AT49F001-55JI FAQ
1.How can I place an order for AT49F001-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001-55JI 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 AT49F001-55JI reliable?
The price and inventory of AT49F001-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001-55JI is usually 5 days.
3.What payment methods are accepted for AT49F001-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001-55JI?
AT49F001-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001-55JI 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 AT49F001-55JI?
For technical support, including AT49F001-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001-55JI requirements.
6.How does Aetrix verify that AT49F001-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F001-55JI 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 AT49F001-55JI meets industry standards.
7.What is the process for return or replacement of AT49F001-55JI?
All AT49F001-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001-55JI, 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 AT49F001-55JI part is unused and in its original packaging.
Return procedure for AT49F001-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001-55JI Tags
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