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Microchip Technology AT49F001T-12JI
- Part No.:
- AT49F001T-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001T-12JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001T-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 architecture with 16K-byte boot block (address range 1C000H–1FFFFH) and lockout capability.
For engineers reviewing the AT49F001T-12JI datasheet, AT49F001T-12JI pinout, AT49F001T-12JI application, or AT49F001T-12JI equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases in industrial firmware storage, and validated alternative parts for design continuity and supply resilience.
Technical Context
The AT49F001T-12JI implements a command-based Flash architecture requiring six-byte sequences for chip/sector erase and boot lockout enable. Its internal program control logic eliminates external high-voltage programming circuitry, supporting standard 5V microprocessor bus timing with CE/OE/WE control lines.
It uses a sector-organized memory map: one 16K-byte boot block (1C000H–1FFFFH), two 8K-byte parameter blocks (1A000H–1BFFFH and 18000H–19FFFH), and two main memory blocks (10000H–17FFFH and 00000H–0FFFFH). Boot block lockout is enforced at ≤5.5V, but override is possible via 12V on RESET - a feature present only on the T-suffix variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 1 Mbit (131,072 × 8 bits); supports firmware image storage for 8-bit microcontrollers with address space up to 20 bits. |
| Read Access Time | 120 ns max (tACC); ensures compatibility with 8 MHz Z80 or 6502-based systems without wait states. |
| Byte Programming Time | 10 µs typical (tBP); enables fast field updates of configuration parameters or calibration data. |
| Erase Cycle Time | 10 seconds max (tEC); allows full-chip or sector-level erasure without external timing circuitry. |
| Operating Voltage | 5.0 V ±10%; single-supply operation eliminates need for charge pumps or dual-rail regulators. |
| Standby Current | 100 µA CMOS (ISB1, commercial temp); reduces power in sleep-mode embedded controllers. |
| Endurance | 10,000 write/erase cycles; sufficient for firmware update logs or infrequently modified system tables. |
| Temperature Range | –40°C to +85°C (industrial grade); qualified for deployment in motor drives, PLCs, and industrial HMIs. |
Pinout & Package
AT49F001T-12JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package (JEDEC MS-016, Variation AE), with lead pitch 1.27 mm, body size 12.45 × 14.95 mm, and pin 1 identifier marked by corner chamfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 20-bit address bus (A0–A16 active; A17–A19 implied by sector decoding); supports full 1Mbit addressing with external decoding for sector selection. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and 68K families; supports byte-wide reads and writes without multiplexing. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; enables bus isolation in multi-device systems. |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during shared-memory access or DMA transfers. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge (CE-controlled) or rising edge (CE-held); initiates command sequences. |
| RESET | Reset Input | Active-low reset; halts ongoing program/erase and forces high-Z outputs; 12V input enables boot block override - unique to T-suffix devices. |
| VCC | Power Supply | +5.0 V ±10% supply; powers core logic and I/O buffers; decoupling required within 1 cm per JEDEC guidelines. |
| GND | Ground Reference | Signal and power return; requires low-inductance connection to minimize noise during erase/program pulses. |
| NC | No Connect | Pin 1 (PLCC top view) is NC; must remain unconnected per datasheet - not tied to VCC, GND, or any signal. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K-byte boot block (1C000H–1FFFFH) can be permanently write-protected via command sequence, securing bootloader code against accidental overwrite. |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low/CE high/WE high blocks writes) prevent spurious writes. |
| DATA Polling & Toggle Bit | Real-time status feedback: I/O7 complement indicates ongoing program cycle; I/O6 toggling signals active erase/program - eliminates need for fixed delay timers. |
| 5V-Only Reprogrammability | No external 12V programming voltage required; all commands executed using standard 5V logic levels, simplifying PCB layout and power design. |
| Industrial Temperature Rating | –40°C to +85°C operation confirmed per ordering code suffix 'I'; suitable for under-hood automotive modules and factory-floor controllers. |
Applications
| Industrial PLC Firmware Storage | Embedded HMI Configuration Memory |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O mapping tables in programmable logic controllers deployed in manufacturing cells. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; executes as memory-mapped ROM during MCU boot and runtime. Use Value: Enables remote firmware updates without removing the module; boot block lockout prevents corruption of critical startup routines during field upgrades. |
Use Scenario: Holding display language packs, touchscreen calibration data, and user profile settings in human-machine interface panels. IC Role / Device Role / Timing Role: Parameter EEPROM replacement; accessed via parallel bus during GUI initialization and runtime configuration changes. Use Value: 10 µs/byte programming allows rapid saving of user preferences; sector erase isolates language updates from calibration data. |
| Motor Drive Bootloader Storage | Legacy Industrial Instrumentation |
Use Scenario: Hosting secure bootloader code that validates and loads application firmware in servo drive controllers. IC Role / Device Role / Timing Role: Protected boot memory; mapped to reset vector address space (1C000H–1FFFFH) for direct CPU fetch on power-up. Use Value: 12V RESET override allows factory recovery of corrupted boot code; 10,000-cycle endurance supports lifetime field recalibration. |
Use Scenario: Replacing obsolete EPROMs in legacy test equipment and process analyzers requiring long-term data retention. IC Role / Device Role / Timing Role: Pin-compatible Flash drop-in for 27C010/27C020 sockets; operates with identical CE/OE/WE timing and 5V supply. Use Value: 120 ns access time meets original EPROM timing specs; PLCC-32 package fits existing sockets without adapter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF010-120-4C-NHE | 5V, 1 Mbit, 120 ns access, PLCC-32; lacks RESET-based boot override and has no dedicated boot block lockout command. | Supports basic firmware storage but cannot enforce immutable bootloader protection without external logic. | Select when boot security is managed externally; verify sector erase compatibility with existing firmware update routines. |
| MX29LV160CBTI-12G | 3V/5V tolerant, 16 Mbit, 120 ns, TSOP-48; includes CFI-compliant command set and wider voltage range but different pinout and density. | Requires PCB redesign and firmware adaptation due to 48-pin TSOP packaging and extended address bus (A0–A20). | Choose for future-proofing with higher density and lower voltage headroom; not a drop-in replacement for AT49F001T-12JI. |
Compared with SST39VF010-120-4C-NHE and MX29LV160CBTI-12G, the AT49F001T-12JI uniquely combines industrial-grade PLCC packaging, dedicated boot block lockout with 12V override, and strict 5V-only operation - making it optimal for legacy 8-bit systems requiring field-recoverable, tamper-resistant firmware storage.
Availability
AT49F001T-12JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded HMI configuration memory, and motor drive bootloader storage requiring stable component supply across extended product lifecycles.
Supply support for AT49F001T-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 legacy Atmel Flash products, including datasheets, application notes, and long-term supply commitments.
The AT49F001T-12JI belongs to Atmel's 5V Flash memory family, designed specifically for in-system reprogrammability in cost-sensitive, industrial-grade 8-bit microcontroller platforms where reliability, pin compatibility, and boot code integrity are critical.
FAQ
What is the function of the RESET pin on the AT49F001T-12JI?
The RESET pin on the AT49F001T-12JI serves dual functions: as an active-low reset signal to halt ongoing operations and force outputs into high-impedance state, and - uniquely for the T-suffix variant - as a 12V override input to reprogram the locked boot block. This 12V capability is absent in N-suffix variants and enables factory recovery of corrupted bootloader code without device replacement. The AT49F001T-12JI datasheet specifies 12.0 V ± 0.5 V for this function.
How does the boot block lockout work on the AT49F001T-12JI?
The AT49F001T-12JI boot block lockout is enabled via a six-byte command sequence (5555h/AAh → 2AAAh/55h → 5555h/80h → 5555h/AAh → 2AAAh/55h → 5555h/40h), after which the 16K-byte region (1C000H–1FFFFH) becomes immune to programming or erasure at ≤5.5 V. Unlike the N-suffix version, the T-suffix allows override using 12V on RESET. Once enabled, the lockout persists until power cycle, and status is readable at address 1C002H via I/O0.
What package type is used for the AT49F001T-12JI?
The AT49F001T-12JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's ordering guide. Its dimensions conform to JEDEC MS-016, Variation AE: body size 12.45 × 14.95 mm, lead pitch 1.27 mm, and pin 1 identified by a corner chamfer. Pin 1 is a no-connect (NC) terminal and must remain unattached per datasheet requirements.
Can the AT49F001T-12JI replace older EPROMs like the 27C010?
Yes, the AT49F001T-12JI is a functional and pin-compatible replacement for 27C010 EPROMs in PLCC-32 sockets, offering identical 1 Mbit (128K × 8) organization, 5V operation, and CE/OE/WE control interface. Its 120 ns read access time meets or exceeds 27C010-120 timing, and in-system reprogrammability eliminates UV erasers. However, firmware must be adapted to support Flash command sequences instead of EPROM write protocols.
What is the maximum erase time for the AT49F001T-12JI?
The maximum erase time for the AT49F001T-12JI is 10 seconds for a full chip erase (tEC), as specified in the datasheet AC characteristics table. Sector erase times are not individually specified but fall within the same 10-second bound. During erase, ICC rises to 90 mA, and the device internally manages timing - no external clocks or delays are required. Status can be monitored via DATA polling (I/O7) or Toggle Bit (I/O6) detection.
AT49F001T-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)
AT49F001T-12JI FAQ
1.How can I place an order for AT49F001T-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001T-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 AT49F001T-12JI reliable?
The price and inventory of AT49F001T-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001T-12JI is usually 5 days.
3.What payment methods are accepted for AT49F001T-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001T-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001T-12JI?
AT49F001T-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001T-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 AT49F001T-12JI?
For technical support, including AT49F001T-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001T-12JI requirements.
6.How does Aetrix verify that AT49F001T-12JI is sourced from the original manufacturer or authorized distributors?
All AT49F001T-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 AT49F001T-12JI meets industry standards.
7.What is the process for return or replacement of AT49F001T-12JI?
All AT49F001T-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001T-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 AT49F001T-12JI part is unused and in its original packaging.
Return procedure for AT49F001T-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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