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Microchip Technology AT49F040-90JI
- Part No.:
- AT49F040-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F040-90JI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,211
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Product details
Overview
AT49F040-90JI from Atmel is a 4-megabit (512K × 8) 5V-only parallel Flash memory IC used for nonvolatile program/data storage in embedded systems. It features 55 ns read access time, 50 µs byte programming, 10-second chip erase, 16 KB boot block with hardware lockout, and operates across -40°C to +85°C industrial temperature range. It serves as firmware storage in microcontroller-based boot loaders.
For engineers reviewing the AT49F040-90JI datasheet, AT49F040-90JI pinout, AT49F040-90JI application, or AT49F040-90JI equivalent, key selection criteria include industrial-grade temperature support, PLCC-32 packaging, boot-block write protection, DATA polling/Toggle Bit status detection, and 5V-only single-supply reprogrammability without high-voltage programming pins.
Technical Context
The AT49F040-90JI implements a standard parallel Flash architecture with address latching on the falling edge of CE or WE (whichever occurs last) and data latching on the rising edge (whichever occurs first). Its internal command register executes 4-bus-cycle byte programming and 6-byte software chip erase sequences using address/data patterns at fixed locations (e.g., 5555H/2AAAH).
It supports three primary operational modes: Read (CE/OE low, WE high), Byte Program (CE low, OE high, WE low), and Standby (CE high). Hardware data protection includes VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and multi-signal inhibit (OE low, CE high, or WE high blocks writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8); provides full 8-bit data bus interface for legacy microcontrollers and FPGA configuration. |
| Read Access Time | 90 ns max; ensures compatibility with 11 MHz bus timing in industrial 8051 or Z80-based systems. |
| Byte Programming Time | 50 µs typical; enables fast field firmware patching without external high-voltage generators. |
| Chip Erase Time | 10 seconds max; allows full memory reset during production programming or recovery procedures. |
| Boot Block Size | 16 KB (00000H–03FFFH); isolates critical boot code from accidental overwrite during application updates. |
| Operating Voltage | 5.0 V ±10%; eliminates need for dual-voltage regulators or charge pumps in 5V system designs. |
| Temperature Range | -40°C to +85°C; qualified for industrial control panels, motor drives, and outdoor instrumentation. |
| Endurance | 10,000 program/erase cycles; supports long-term field update capability in deployed equipment. |
Pinout & Package
AT49F040-90JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package with standard 0.5-inch body size and J-bend leads. Pin 1 is marked by an index notch at the top-left corner in top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A17 used for main array, A18 selects upper/lower half. |
| CE | Chip Enable | Active-low chip select; must be low for any read/write operation; enables bus isolation when high. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high to prevent bus contention. |
| WE | Write Enable | Active-low write strobe; latches input data on rising edge; controls byte programming initiation. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read, program, and status polling (DATA Polling on I/O7, Toggle Bit on I/O6). |
| VCC | Power Supply | +5V supply pin; powers core logic and I/O buffers; requires local 0.1 µF decoupling per datasheet layout guidelines. |
| GND | Ground Reference | Signal and power ground return; must be connected to system ground plane with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for +12V programming voltage rails, simplifying PCB power design and reducing BOM cost. |
| Hardware Boot Block Lockout | Permanent write protection for 16 KB boot sector after activation via 6-byte command sequence; prevents corruption of startup firmware. |
| DATA Polling Status Detection | I/O7 returns complement of programmed data until completion, enabling software-driven timing-free program cycle termination. |
| Toggle Bit (I/O6) | I/O6 toggles during active program/erase; stabilizes when operation completes-provides asynchronous status without dedicated BUSY pin. |
| CMOS Standby Current | 100 µA max at VCC = 5V; reduces power consumption in sleep-mode embedded systems with persistent nonvolatile storage. |
| VCC Sense Protection | Automatically disables programming if VCC drops below ~3.8 V, preventing partial writes and data corruption during brown-out conditions. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot Memory |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing direct 8-bit bus interface to 80C51 or 80C188 CPU; accessed via standard memory-mapped read cycles with 90 ns timing margin. Use Value: Industrial temperature rating (-40°C to +85°C) and hardware boot lockout ensure reliable boot execution after power cycling or EMI events. | Use Scenario: Holding boot loader code and initial RAM initialization routines in older 8-bit/16-bit embedded systems where external ROM is required before DRAM initialization. IC Role / Device Role / Timing Role: Primary boot device mapped to lowest 16 KB address space (00000H–03FFFH); accessed during CPU reset vector fetch with no wait states required at 5 MHz bus speed. Use Value: Bottom-boot architecture and lockout feature guarantee that boot code remains intact during field updates to application firmware stored in higher memory regions. |
| Medical Device Configuration Storage | Telecom Line Card Parameter Memory |
Use Scenario: Retaining calibration coefficients, user preferences, and safety-critical configuration parameters in Class II medical instruments requiring long-term data retention and tamper resistance. IC Role / Device Role / Timing Role: Secure nonvolatile storage element interfaced to microcontroller via GPIO-controlled CE/OE/WE signals; accessed only during setup or maintenance mode. Use Value: 10,000 write cycles and 20-year data retention meet IEC 62304 requirements for configurable medical devices without battery-backed SRAM. | Use Scenario: Storing line-specific DSP initialization parameters and protocol stack configuration in carrier-grade DSLAM or VoIP gateway line cards subject to frequent firmware upgrades. IC Role / Device Role / Timing Role: Field-upgradable Flash memory sharing address/data bus with DSP; erased and reprogrammed in-system using host processor commands. Use Value: Software-controlled chip erase and byte programming enable zero-downtime parameter updates without removing the line card from service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-90EC | 4 Mbit (512K × 8), 3.3V/5V tolerant, 90 ns access, 12 V programming not required; lacks dedicated boot block lockout. | Supports mixed-voltage systems but requires external logic for 5V-only bus compatibility; no hardware-enforced boot protection. | Select when migrating to 3.3V domains or needing voltage flexibility; verify timing margins with 5V I/O drivers. |
| SST39VF400A-90-4C-NHE | 4 Mbit (512K × 8), 3.3V only, 90 ns access, bottom-boot architecture, 16 KB protected sector; requires 3.3V supply and level-shifting for 5V buses. | Lower power consumption (30 mA active), but incompatible with native 5V microcontrollers without translation. | Choose for new 3.3V designs prioritizing power efficiency; avoid in existing 5V-only systems due to voltage mismatch. |
Compared with AM29LV040B-90EC and SST39VF400A-90-4C-NHE, the AT49F040-90JI offers guaranteed 5V-only operation, industrial temperature support, and hardware-enforced boot block lockout-making it optimal for legacy 5V embedded systems requiring robust firmware integrity without voltage translation or external protection logic.
Availability
AT49F040-90JI is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller boot loaders, medical device configuration storage, telecom line card parameter memory, and embedded instrumentation requiring stable component supply over extended product lifecycles.
Supply support for AT49F040-90JI 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49F040-90JI belongs to Atmel's 5V parallel Flash memory product line, designed specifically for in-system reprogrammability in legacy 5V embedded platforms where simplicity, reliability, and industrial temperature operation are critical.
FAQ
What is the operating temperature range for the AT49F040-90JI?
The AT49F040-90JI is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table on page 5 of the official Atmel datasheet (Rev. 0998D–03/01), where the "-90JI" suffix explicitly denotes the industrial grade variant. The device maintains full functionality-including 90 ns read access and 50 µs byte programming-across this entire range.
Does the AT49F040-90JI require high-voltage programming signals?
No, the AT49F040-90JI does not require high-voltage programming signals. It operates exclusively from a single 5V supply for both read and byte programming functions. Programming is enabled via standard 5V logic-level commands executed through the address/data bus using a defined 6-byte software sequence. Hardware protection features-including VCC sense below 3.8 V-actively inhibit programming if supply voltage is insufficient, ensuring safe operation without external voltage boosters.
How is boot block protection implemented in the AT49F040-90JI?
The AT49F040-90JI implements boot block protection via a one-time hardware lockout feature for the 16 KB sector at addresses 00000H–03FFFH. Activation requires executing a specific six-command sequence (load AAH to 5555H, 55H to 2AAAH, then 40H to 5555H) while in standard operation mode. Once enabled, the boot block becomes permanently read-only: no erase or program commands affect it, and software identification reads I/O0 = high at address 00002H to confirm lock status.
What package type is used for the AT49F040-90JI?
The AT49F040-90JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, designated as "32J" in Atmel's ordering information (page 11 of the datasheet). This surface-mount package features a square body with J-shaped leads, 0.5-inch nominal outline, and pin 1 identified by a corner notch. It is distinct from the PDIP ("32P6") and TSOP ("32T") variants also offered in the AT49F040 family.
Can the AT49F040-90JI be used in a 5V microcontroller system without level shifting?
Yes, the AT49F040-90JI is fully compatible with 5V microcontroller systems without level shifting. Its DC specifications-including VIH = 2.0 V min, VIL = 0.8 V max, VOH = 2.4 V min (IOH = -400 µA), and VOL = 0.45 V max (IOL = 2.1 mA)-are aligned with standard TTL/5V CMOS logic families. The device draws 50 mA active current and interfaces directly to 8051, 80C188, or similar 5V CPUs using standard memory-mapped bus protocols.
AT49F040-90JI 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:
- 4Mbit
- Memory Organization:
- 512K 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)
AT49F040-90JI FAQ
1.How can I place an order for AT49F040-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040-90JI 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 AT49F040-90JI reliable?
The price and inventory of AT49F040-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040-90JI is usually 5 days.
3.What payment methods are accepted for AT49F040-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040-90JI?
AT49F040-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040-90JI 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 AT49F040-90JI?
For technical support, including AT49F040-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040-90JI requirements.
6.How does Aetrix verify that AT49F040-90JI is sourced from the original manufacturer or authorized distributors?
All AT49F040-90JI 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 AT49F040-90JI meets industry standards.
7.What is the process for return or replacement of AT49F040-90JI?
All AT49F040-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040-90JI, 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 AT49F040-90JI part is unused and in its original packaging.
Return procedure for AT49F040-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F040-90JI Tags
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