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Microchip Technology AT49F001T-90JI
- Part No.:
- AT49F001T-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001T-90JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001T-90JI from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC with 90 ns read access time, 10 µs/byte typical programming time, and sector-based erase architecture including a 16 KB boot block with programmable lockout. It serves as nonvolatile program/data storage in embedded microcontroller boot loaders and firmware update subsystems.
For engineers reviewing the AT49F001T-90JI datasheet, AT49F001T-90JI pinout, AT49F001T-90JI application, or AT49F001T-90JI equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for industrial-grade Flash memory selection.
Technical Context
The AT49F001T-90JI implements a sector-erasable 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). Its command-set-driven operation uses standard CE/OE/WE control lines and supports hardware reset override (12 V on RESET) to unlock the boot block.
It features DATA polling (I/O7 complement detection) and toggle-bit (I/O6 toggling) methods for end-of-program/erase cycle detection, internal program timing, and hardware data protection via VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line gating (OE low/CE high/WE high inhibits writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - provides sufficient space for boot code + configuration data in resource-constrained systems. |
| Read Access Time | 90 ns max - enables direct execution from Flash (XIP) in 8-bit microcontrollers operating up to ~11 MHz bus frequency. |
| Byte Programming Time | 10 µs typical (50 µs max) - allows rapid field updates of small firmware patches without long write stalls. |
| Erase Cycle Time | 10 seconds max for full chip or sector erase - supports predictable maintenance windows during firmware upgrades. |
| Endurance | 10,000 program/erase cycles - qualifies for industrial applications requiring multi-year field updates. |
| Operating Voltage | 5.0 V ±10% - eliminates need for external voltage translators in legacy 5 V logic systems. |
| Temperature Range | −40°C to +85°C (Industrial) - ensures reliable operation in extended-temperature embedded environments. |
| Standby Current | 100 µA CMOS (max 300 µA at Industrial temp) - enables low-power sleep modes in battery-backed or energy-sensitive systems. |
Pinout & Package
AT49F001T-90JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package (JEDEC MS-016, Variation AE), measuring 12.47 mm × 14.99 mm × 3.35 mm (max height), with gull-wing leads and pin 1 identifier notch.
| 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 locations 00000H–1FFFFH. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface for read/write operations; supports byte-level programming and DATA polling on I/O7/I/O6. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; dual-line control prevents bus contention. |
| OE | Output Enable | Active-low output gate; controls data bus tristate; used with CE for flexible timing and shared-bus arbitration. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence; initiates programming/erase cycles. |
| RESET | Hardware Reset Input | Active-low reset; halts ongoing operations and forces high-impedance outputs; 12 V input overrides boot block lockout (not available on N(T) variants). |
| VCC | Power Supply | +5.0 V ±10% supply; powers core logic and array; VCC sense circuitry disables programming if voltage drops below ~3.8 V. |
| GND | Ground Reference | Signal and power return path; decoupling required near VCC pin to maintain noise immunity during fast transitions. |
| NC | No Connect | Pin 1 in PLCC package is NC (no internal connection); must be left unconnected per datasheet specification. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16 KB boot block (1C000H–1FFFFH) can be permanently locked via command sequence, protecting bootloader integrity while allowing runtime updates to application sectors. |
| 5V-Only In-System Reprogrammability | Eliminates need for 12 V programming supplies; compatible with standard 5 V microcontroller buses and simplifies PCB design and system-level firmware update infrastructure. |
| DATA Polling & Toggle Bit Detection | Enables software-controlled wait-state management during programming/erase without timers or external status signals - reduces CPU overhead and improves deterministic timing. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line gating prevent accidental writes due to power glitches, EMI, or software errors - critical for field-deployed reliability. |
| Industrial Temperature Operation | Rated for −40°C to +85°C case temperature with guaranteed 100 µA standby current and 90 ns read timing - suitable for automotive body control, industrial HMI, and telecom edge equipment. |
Applications
| Industrial PLC Firmware Storage | Embedded Bootloader Memory |
|---|---|
|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile storage for boot code, application firmware, and user-configurable parameters; accessed via 8-bit parallel bus during cold start and runtime updates. Use Value: Sector erase capability enables selective reprogramming of application modules without disturbing protected bootloader, reducing downtime during field upgrades. |
Use Scenario: Hosting secure boot code for ARM Cortex-M or 8051-based devices where tamper-resistant startup sequence is mandatory. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector; executes first instructions after power-on; supports XIP with 90 ns access latency. Use Value: Boot block lockout prevents corruption of critical startup routines during over-the-air updates, ensuring system recoverability after failed firmware loads. |
| Medical Device Configuration Storage | Telecom Edge Equipment Parameter Memory |
|
Use Scenario: Retaining calibration data, device serial numbers, and regulatory compliance settings in portable diagnostic instruments requiring long-term data retention and audit trails. IC Role / Device Role / Timing Role: Parameter storage element interfaced to microcontroller's parallel bus; updated infrequently but with strict write-protection requirements. Use Value: Two independent 8 KB parameter blocks allow A/B versioning of calibration tables, enabling safe rollback and validation before committing changes. |
Use Scenario: Holding line-card initialization profiles, DSP coefficient sets, and protocol stack parameters in DSLAM or base station remote units operating in uncontrolled telecom cabinets. IC Role / Device Role / Timing Role: Field-upgradable configuration memory accessed during card initialization and dynamic service provisioning. Use Value: 10,000-cycle endurance and industrial temp rating ensure >10-year service life under repeated provisioning cycles in thermally stressed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F001N-90JI | Same density, timing, and sector architecture, but boot block address range is 00000H–03FFFH (not 1C000H–1FFFFH); lacks RESET pin override for boot block unlock. | Designed for systems where boot code resides in lowest memory region; not suitable when legacy layout requires top-of-memory boot vector. | Select only if boot block location at 00000H matches system memory map and 12 V RESET override is unnecessary. |
| SST39VF010-90-4C-NHE | 1 Mbit, 90 ns, 3.3 V operation (not 5 V); different command set; no hardware RESET override; 32-pin TSOP package only. | Requires level-shifting in 5 V systems; incompatible with existing 5 V-only control logic and timing margins. | Consider only for new 3.3 V designs prioritizing lower power; not a drop-in replacement for AT49F001T-90JI. |
Compared with AT49F001N-90JI and SST39VF010-90-4C-NHE, the AT49F001T-90JI uniquely supports top-address boot block placement (1C000H–1FFFFH) and 12 V RESET-based boot sector reprogramming - essential for legacy 5 V systems requiring field-recoverable bootloader updates without hardware redesign.
Availability
AT49F001T-90JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded bootloader memory, medical device configuration storage, and telecom edge equipment parameter memory requiring stable component supply across extended product lifecycles.
Supply support for AT49F001T-90JI 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, delivering high-reliability, mature-process Flash memory solutions for industrial and automotive applications.
The AT49F001 product line was designed specifically for 5 V in-system reprogrammable nonvolatile storage in microcontroller-based systems requiring robust boot code protection and field-upgradable firmware without external high-voltage circuitry.
FAQ
What is the boot block address range for AT49F001T-90JI?
The AT49F001T-90JI boot block occupies memory addresses 1C000H to 1FFFFH (16 KB), distinct from the AT49F001N variant's 00000H–03FFFH range. This top-of-memory layout aligns with common reset vector conventions in 8-bit microcontrollers and is fixed for the "T" suffix part. The AT49F001T-90JI datasheet confirms this mapping in Section 6 and the Command Definitions table.
Does AT49F001T-90JI support 12 V programming voltage?
No - the AT49F001T-90JI is a 5 V-only device: all read, program, and erase operations use standard 5 V logic levels. However, applying 12.0 V ±0.5 V to the RESET pin (pin 29 in PLCC) temporarily overrides the boot block programming lockout, enabling chip/sector erase or byte programming of the protected region. This is a hardware feature, not a programming voltage requirement.
How is end-of-program detection implemented in AT49F001T-90JI?
The AT49F001T-90JI supports two hardware-assisted methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and Toggle Bit (I/O6 toggles between 0 and 1 during active programming/erase). Both allow the host microcontroller to poll asynchronously without timers or external status lines, reducing firmware complexity and improving timing predictability during AT49F001T-90JI write cycles.
What is the purpose of the NC pin on AT49F001T-90JI PLCC package?
Pin 1 of the AT49F001T-90JI's 32-lead PLCC package is designated NC (No Connect) and must remain unconnected. This is explicitly stated in the datasheet's Pin Configurations section and confirmed in the Ordering Information table for all "J"-suffixed variants. Connecting or routing this pin risks undefined behavior or damage, as it has no internal bond wire or circuit connection.
Can AT49F001T-90JI be used in place of AT49F001-90JI?
No - AT49F001-90JI is not a valid part number in the Atmel/Microchip documentation. The correct base part numbers are AT49F001, AT49F001N, AT49F001T, and AT49F001NT. The "T" suffix in AT49F001T-90JI denotes the top-address boot block configuration (1C000H–1FFFFH), which is functionally and electrically distinct from the "N" or base variants. Substituting without verifying boot block location and RESET functionality may cause system boot failure.
AT49F001T-90JI 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:
- 90 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-90JI FAQ
1.How can I place an order for AT49F001T-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001T-90JI 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-90JI reliable?
The price and inventory of AT49F001T-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001T-90JI is usually 5 days.
3.What payment methods are accepted for AT49F001T-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001T-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001T-90JI?
AT49F001T-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001T-90JI 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-90JI?
For technical support, including AT49F001T-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001T-90JI requirements.
6.How does Aetrix verify that AT49F001T-90JI is sourced from the original manufacturer or authorized distributors?
All AT49F001T-90JI 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-90JI meets industry standards.
7.What is the process for return or replacement of AT49F001T-90JI?
All AT49F001T-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001T-90JI, 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-90JI part is unused and in its original packaging.
Return procedure for AT49F001T-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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