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Microchip Technology AT49F001-12JI
- Part No.:
- AT49F001-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001-12JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,036
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Product details
Overview
AT49F001-12JI 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 microcontroller systems. It features 55 ns read access time, 10 µs/byte typical programming, 10-second chip erase, hardware data protection, and sector-based architecture with a 16 KB boot block supporting programming lockout. It is commonly deployed in industrial firmware storage and boot loader applications.
For engineers reviewing the AT49F001-12JI datasheet, AT49F001-12JI pinout, AT49F001-12JI application, or AT49F001-12JI equivalent, key selection considerations include its industrial temperature range (–40°C to +85°C), PLCC-32 package, 5V single-supply operation, boot block write protection, and compatibility with standard microprocessor bus timing for CE/OE/WE control.
Technical Context
The AT49F001-12JI implements a sector-organized Flash architecture with one 16 KB boot block (address range 1C000H–1FFFFH), two 8 KB parameter blocks, and two main memory blocks (32 KB and 64 KB). It uses command-based software control for erase and program operations without requiring external high-voltage programming signals.
It supports DATA polling (I/O7 complement) and toggle-bit detection (I/O6) for end-of-program/erase cycle monitoring, and includes VCC sense, noise filtering, and input-level inhibition to prevent inadvertent writes. The RESET pin enables system reset and - when driven to 12 V - overrides boot block lockout for reprogramming.
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 plus configuration data in resource-constrained systems. |
| Read Access Time | 120 ns max (tACC), 55 ns typical - meets timing requirements for 8-bit microcontrollers running at ≤8 MHz with wait-state-free operation. |
| Byte Programming Time | 10 µs typical (tBP), 50 µs max - enables rapid field updates of small firmware patches or calibration tables. |
| Chip Erase Time | 10 seconds max (tEC) - allows predictable firmware recovery cycles during manufacturing or field service. |
| Endurance | 10,000 program/erase cycles - supports long-term field upgrades over product lifetime in industrial equipment. |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5V logic families and eliminates need for voltage translation in 5V systems. |
| Temperature Range | –40°C to +85°C (industrial grade) - suitable for deployment in factory automation, motor drives, and outdoor embedded controllers. |
Pinout & Package
AT49F001-12JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE, with lead coplanarity ≤0.102 mm and body dimensions 12.45 mm × 14.95 mm × 3.35 mm (max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0–A16 map directly to memory location bits. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface for read/write transfers; high-impedance when CE or OE is inactive. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; prevents bus contention. |
| OE | Output Enable | Active-low output control; used with CE to gate data output without affecting internal state. |
| WE | Write Enable | Active-low signal initiating byte programming, sector erase, or command latching; synchronized with address/data edges. |
| RESET | Reset Input | Active-low system reset; forces outputs to high-Z; 12 V on this pin overrides boot block lockout (not available on N(T) variants). |
| NC | No Connect | Pin 1 in PLCC package is unconnected - must be left floating or tied to ground per layout guidelines. |
| VCC | Power Supply | +5 V supply; requires local 0.1 µF ceramic decoupling close to pin for stable read/write operation. |
| GND | Ground Reference | Signal and power return; separate ground plane recommended to minimize noise coupling during erase cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16 KB boot sector (1C000H–1FFFFH) can be permanently write-protected via command sequence, ensuring bootloader integrity across firmware updates. |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and triple-input inhibit (OE low / CE high / WE high) prevent accidental writes. |
| Two End-of-Operation Detection Methods | DATA polling (I/O7 complement) and toggle-bit (I/O6 toggling) allow flexible, interrupt-driven or polling-based firmware update coordination. |
| 5V-Only In-System Reprogrammability | Eliminates need for external 12 V programming supplies; compatible with standard microprocessor write cycles using CE/OE/WE timing. |
| Low Power Standby | 100 µA CMOS standby current (ISB1) minimizes quiescent power in battery-backed or energy-sensitive applications. |
Applications
| Industrial PLC Firmware Storage | Embedded Boot Loader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast 120 ns read access enabling deterministic boot execution and real-time task loading. Use Value: Industrial temperature rating (–40°C to +85°C) and 10,000-cycle endurance ensure reliable operation over 10+ years of scheduled firmware updates. |
Use Scenario: Hosting secure boot code that initializes CPU, configures peripherals, and validates application image integrity before execution. IC Role / Device Role / Timing Role: Boot block (16 KB) with hardware-enforced programming lockout serves as tamper-resistant root-of-trust storage. Use Value: Boot block lockout prevents unauthorized modification of bootloader while allowing field updates to application sectors via standard 5V commands. |
| Motor Drive Parameter Calibration | Legacy 5V System BIOS/Configuration Storage |
Use Scenario: Retaining motor-specific tuning parameters (PID gains, current limits, commutation offsets) across power cycles in variable-frequency drives. IC Role / Device Role / Timing Role: Parameter blocks (2 × 8 KB) provide dedicated, independently erasable zones for field-serviceable calibration data. Use Value: Sector erase capability enables safe, atomic updates of calibration sets without disturbing boot or application code. |
Use Scenario: Replacing obsolete EPROMs in legacy industrial motherboards requiring BIOS, setup defaults, or hardware configuration storage. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for 27C010/27C020 EPROMs with identical DIP/PLCC footprints and CE/OE/WE interface timing. Use Value: 5V-only operation and 55 ns read speed eliminate need for UV-erasable sockets or 12 V programming adapters in retrofit designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF010-70-4C-NHE | 40 ns faster read (70 ns vs. 120 ns), 3.3 V only, no RESET pin, no boot block lockout override | Requires 3.3 V system; lacks 12 V RESET override for boot block recovery; not pin-compatible with PLCC-32 | Select if migrating to 3.3 V design and prioritizing read speed over boot security features. |
| MX29LV001CTTI-12 | Same 120 ns speed, 3.0–3.6 V supply, top-boot sector (00000H–03FFFH), no 12 V RESET override | Lower voltage operation reduces power; boot block at bottom address; incompatible RESET functionality and command set | Choose for cost-sensitive 3.3 V systems where boot block location matches legacy layout and 12 V override is unnecessary. |
Compared with SST39VF010-70-4C-NHE and MX29LV001CTTI-12, the AT49F001-12JI uniquely combines industrial-grade 5V operation, PLCC-32 packaging, hardware-enforced boot block lockout, and 12 V RESET override - making it the only option supporting secure, field-recoverable firmware in legacy 5V embedded platforms.
Availability
AT49F001-12JI is available at Aetrix Electronics and suitable for industrial automation, motor control, and legacy system retrofits requiring stable component supply, long-lifecycle support, and guaranteed availability of PLCC-packaged Flash memory.
Supply support for AT49F001-12JI 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, application notes, and long-term supply commitments for industrial-grade Flash products.
The AT49F001 series was designed specifically for 5V embedded systems needing in-system reprogrammability without high-voltage programming infrastructure - targeting boot code, firmware, and configuration storage in PLCs, instrumentation, and telecom infrastructure.
FAQ
What is the operating temperature range for the AT49F001-12JI?
The AT49F001-12JI is rated for industrial operation from –40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table of the official datasheet (Rev. 1008D), where the "-12" suffix denotes 120 ns access time and "I" suffix indicates industrial temperature grade. The device maintains full electrical performance across this range, including 100 µA standby current and 50 mA active current.
Does the AT49F001-12JI support boot block programming lockout, and how is it enabled?
Yes, the AT49F001-12JI supports boot block programming lockout for its 16 KB boot sector (1C000H–1FFFFH). It is enabled by executing a six-cycle command sequence: load AAH to 5555H, 55H to 2AAAH, 80H to 5555H, AAH to 5555H, 55H to 2AAAH, and 40H to 5555H. Once activated, the boot block cannot be erased or programmed at ≤5.5 V - a feature confirmed in the "Boot Block Programming Lockout" section of the datasheet.
What package type is used for the AT49F001-12JI, and are there pin-compatible alternatives?
The AT49F001-12JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package (package code 32J), compliant with JEDEC MS-016. Pin-compatible alternatives in the same family include AT49F001-12JC (commercial temp) and AT49F001N-12JI (same package, different boot block address mapping). No non-Atmel part offers identical PLCC-32 pinout, command set, and 5V-only operation.
Can the AT49F001-12JI be reprogrammed in-circuit without removing it from the board?
Yes, the AT49F001-12JI supports full in-system reprogramming using only 5 V supply and standard microprocessor bus timing. No external high-voltage programmer is required. Erase and program operations are initiated via software command sequences applied to the CE/OE/WE interface, as detailed in the "Command Definitions" table and "Device Operation" section of the datasheet.
What is the maximum erase time for the AT49F001-12JI, and does it vary by sector?
The maximum chip erase time for the AT49F001-12JI is 10 seconds (tEC), as specified in the "Program Cycle Characteristics" table. Sector erase time is not separately specified but is implied to be ≤10 seconds since sector erase uses the same internal timing mechanism. The datasheet confirms all erase operations - chip or sector - are internally controlled and require no external clocks.
AT49F001-12JI 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:
- 120 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)
AT49F001-12JI FAQ
1.How can I place an order for AT49F001-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001-12JI 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 AT49F001-12JI reliable?
The price and inventory of AT49F001-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001-12JI is usually 5 days.
3.What payment methods are accepted for AT49F001-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001-12JI?
AT49F001-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001-12JI 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 AT49F001-12JI?
For technical support, including AT49F001-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001-12JI requirements.
6.How does Aetrix verify that AT49F001-12JI is sourced from the original manufacturer or authorized distributors?
All AT49F001-12JI 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 AT49F001-12JI meets industry standards.
7.What is the process for return or replacement of AT49F001-12JI?
All AT49F001-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001-12JI, 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 AT49F001-12JI part is unused and in its original packaging.
Return procedure for AT49F001-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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