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Microchip Technology AT49F001-90JI
- Part No.:
- AT49F001-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001-90JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001-90JI 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 16KB boot block, two 8KB parameter blocks, and two main memory blocks (32KB + 64KB).
For engineers reviewing the AT49F001-90JI datasheet, AT49F001-90JI pinout, AT49F001-90JI application, or AT49F001-90JI equivalent, this page delivers verified technical context, exact pin functions for PLCC-32 package, real-world use cases in boot firmware and parameter storage, and validated alternative parts with documented functional and application-level differences.
Technical Context
The AT49F001-90JI implements a command-register-based architecture requiring six-byte software sequences for chip/sector erase and boot lockout enable. Its internal program control logic handles timing autonomously-no external clocks needed-and supports DATA polling (I/O7 complement) and toggle-bit (I/O6) methods for cycle completion detection.
It uses standard EPROM-compatible control signals (CE/OE/WE) for read operation and integrates VCC sense, noise filtering (<15 ns pulse rejection), and multi-input inhibit logic to prevent inadvertent writes. The RESET pin enables system-level reset and-on non-N(T) variants-12V override of boot block lockout, though this feature is disabled on AT49F001N(T) variants including AT49F001-90JI.
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 loader + configuration data in 8-bit/16-bit MCU systems. |
| Read Access Time | 90 ns maximum - meets timing requirements for 10 MHz bus interfaces without wait states. |
| Byte Programming Time | 10 µs typical (50 µs max) - enables fast field updates of small configuration records or calibration tables. |
| Chip Erase Time | 10 seconds maximum - deterministic erase duration simplifies host firmware timeout handling. |
| Endurance | 10,000 write/erase cycles - supports long-term field reprogramming in industrial controllers and instrumentation. |
| Power Dissipation | 275 mW active (55 ns @ 5V), <100 µA CMOS standby - suitable for low-power embedded systems with battery backup. |
| Operating Voltage | 5.0 V ±10% - eliminates need for dedicated programming voltage rails; compatible with legacy 5V logic buses. |
Pinout & Package
AT49F001-90JI 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 12.5 mm × 14.9 mm, and coplanarity ≤0.102 mm.
| 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 0x00000–0x1FFFF. |
| 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 tri-state buffer enable independently of CE, enabling flexible bus arbitration. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing; inhibits programming if held high. |
| I/O0–I/O7 | Data Input/Output | Bi-directional 8-bit data bus; carries command bytes, program data, and read outputs; supports DATA polling on I/O7 and toggle-bit on I/O6. |
| RESET | Reset Input | Active-low system reset; halts ongoing operations and forces outputs to high-Z; 12V override capability disabled on AT49F001N(T) variants like AT49F001-90JI. |
| VCC | Power Supply | +5.0 V ±10% supply; powers core logic and I/O buffers; VCC sense circuitry disables programming if voltage drops below ~3.8 V. |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal circuitry. |
| NC | No Connect | Pin 1 in PLCC package is NC - must remain unconnected per datasheet; not usable as spare I/O or tie point. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16KB boot block (0x1C000–0x1FFFF) supports permanent secure firmware storage; lockout enabled via 6-byte command sequence prevents accidental overwrite during field updates. |
| Hardware Data Protection | VCC sense, OE/CE/WE inhibit logic, and 15 ns noise filter eliminate spurious writes - critical for reliability in electrically noisy industrial environments. |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggling provide real-time, software-driven confirmation of program/erase completion - removes need for fixed delays or external status monitoring. |
| 5V-Only Reprogrammability | Eliminates requirement for 12V programming supplies or charge pumps - simplifies PCB design and reduces BOM cost in 5V systems. |
| CMOS Standby Current | ≤100 µA at VCC = 5V - enables ultra-low-power retention in battery-backed applications such as smart meters and remote sensors. |
Applications
| Boot Firmware Storage | Industrial Parameter Configuration |
|---|---|
Use Scenario: Storing bootloader code that initializes CPU, configures peripherals, and loads application firmware from external media or network. IC Role / Device Role / Timing Role: Nonvolatile code storage with guaranteed integrity; boot block lockout ensures first-stage firmware remains uncorrupted during application updates. Use Value: Prevents system brickage during field firmware upgrades by isolating immutable boot code from modifiable application sectors. |
Use Scenario: Retaining calibrated sensor offsets, PID tuning constants, and device-specific settings across power cycles in PLC modules and motor drives. IC Role / Device Role / Timing Role: Parameter block (8KB ×2) provides dedicated, fast-access storage for runtime-critical configuration data updated infrequently but read frequently. Use Value: Enables zero-latency access to calibrated values without EEPROM wear-out concerns or slow I²C/SPI overhead. |
| Main Memory Data Logging | Firmware Field Update Buffer |
Use Scenario: Capturing timestamped operational events (e.g., fault logs, temperature history) in energy meters and HVAC controllers. IC Role / Device Role / Timing Role: Main memory blocks (32KB + 64KB) serve as circular buffer storage; sector erase allows selective overwriting without full chip erase. Use Value: Supports >10,000 erase cycles - sufficient for 10+ years of daily logging at 3-event/sec rate in industrial deployments. |
Use Scenario: Holding new firmware images prior to atomic swap-and-boot in medical devices and telecom edge nodes. IC Role / Device Role / Timing Role: Dual main memory blocks allow one block to run active firmware while the other receives and validates updates - enabling safe, rollback-capable OTA updates. Use Value: Eliminates downtime during firmware deployment and guarantees recovery to known-good version after failed update. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002-90JI | 2 Mbit (256K × 8), same PLCC-32 package, identical command set and timing - double density with no interface change. | Supports larger boot images or extended parameter sets; requires no PCB redesign but may increase cost and power slightly. | Select when future firmware growth or additional configuration space is anticipated; pinout and software drivers remain fully compatible. |
| SST39VF010-90-4C-NHE | 1 Mbit, 3.3V/5V tolerant, 90 ns access, PLCC-32; lacks boot block lockout and RESET-based override, but adds single-byte write capability. | Better suited for mixed-voltage systems; missing hardware boot protection increases risk of accidental corruption in unattended updates. | Choose for 3.3V-centric designs or where voltage flexibility outweighs boot security; verify host firmware compatibility with different command sequences. |
Compared with AT49F002-90JI, the AT49F001-90JI offers lower density and cost for simpler applications; compared with SST39VF010-90-4C-NHE, it provides stronger boot integrity via hardware lockout but requires strict 5V operation - making it preferable for legacy 5V industrial controllers where firmware security is prioritized over voltage flexibility.
Availability
AT49F001-90JI is available at Aetrix Electronics and suitable for industrial automation, embedded controller boot storage, and instrumentation parameter retention requiring stable component supply across extended product lifecycles.
Supply support for AT49F001-90JI 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 AT49F series Flash memories, ensuring long-term documentation, qualification, and supply chain continuity.
The AT49F001 product line was designed specifically for 5V embedded systems needing reliable, in-system reprogrammable nonvolatile storage with hardware-enforced boot code protection and deterministic erase/program timing.
FAQ
What is the operating temperature range for AT49F001-90JI?
The AT49F001-90JI is rated for industrial temperature operation from –40°C to +85°C. This is confirmed by its ordering suffix "I" and the DC/AC operating range table in the datasheet, which specifies ISB1 (standby current) up to 300 µA under industrial conditions. The "90" denotes 90 ns maximum access time at this temperature range.
Does AT49F001-90JI support boot block programming lockout?
Yes, AT49F001-90JI supports boot block programming lockout. As an AT49F001(N)(T) variant, it implements the 16KB boot block (address range 0x1C000–0x1FFFF) with lockout enabled via a documented six-byte command sequence. Once activated, programming and erasure of the boot block are inhibited at 5.5 V or less - a key security feature for bootloader integrity.
What package type is used for AT49F001-90JI?
AT49F001-90JI uses the 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as "32J" in Atmel's ordering nomenclature. This is explicitly listed in the AT49F001 Ordering Information table, where "AT49F001-90JI" maps to package code 32J, and confirmed by mechanical drawings labeled "32J – PLCC" in the datasheet.
Can AT49F001-90JI be reprogrammed using only 5V supply?
Yes, AT49F001-90JI is a 5-volt-only Flash memory. It requires no high-voltage programming supply: all read, program, and erase operations execute using standard 5.0 V ±10% VCC. This is stated in the Features section ("Single Voltage Operation – 5V Read / 5V Reprogramming") and reinforced by the absence of VPP pin or 12V programming requirements in its pinout and command definitions.
How is the end of a program cycle detected on AT49F001-90JI?
AT49F001-90JI supports two hardware-assisted methods: DATA polling (monitoring I/O7 for complement-to-programmed-data) and Toggle Bit (observing I/O6 toggling state). Both are active during byte programming and erase cycles; once complete, I/O7 returns true data and I/O6 stops toggling - enabling precise, delay-free host firmware synchronization without fixed timeouts.
AT49F001-90JI 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)
AT49F001-90JI FAQ
1.How can I place an order for AT49F001-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001-90JI 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 AT49F001-90JI reliable?
The price and inventory of AT49F001-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001-90JI is usually 5 days.
3.What payment methods are accepted for AT49F001-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001-90JI?
AT49F001-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001-90JI 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 AT49F001-90JI?
For technical support, including AT49F001-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001-90JI requirements.
6.How does Aetrix verify that AT49F001-90JI is sourced from the original manufacturer or authorized distributors?
All AT49F001-90JI 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 AT49F001-90JI meets industry standards.
7.What is the process for return or replacement of AT49F001-90JI?
All AT49F001-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001-90JI, 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 AT49F001-90JI part is unused and in its original packaging.
Return procedure for AT49F001-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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