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Microchip Technology AT49F040-12JI
- Part No.:
- AT49F040-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F040-12JI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,166
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Product details
Overview
AT49F040-12JI from Atmel is a 4-megabit (512K × 8) 5-volt-only parallel Flash memory IC in a 32-lead PLCC package, featuring 55 ns read access time, 10-second chip erase, and byte-programming at 50 µs/byte. It integrates a 16-Kbyte boot block with hardware lockout for secure firmware storage and supports DATA polling and toggle-bit status detection for program/erase cycle monitoring - used in embedded system boot code storage and field-upgradable firmware modules.
For engineers reviewing the AT49F040-12JI datasheet, AT49F040-12JI pinout, AT49F040-12JI application, or AT49F040-12JI equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in industrial controllers and legacy BIOS systems, and validated alternative parts with documented functional and timing differences.
Technical Context
The AT49F040-12JI implements a single-voltage 5V-only architecture with internal command register control for byte programming and software-controlled chip erase via six-byte command sequences. Its memory array is organized as 524,288 × 8 bits, with dedicated boot block (00000H–03FFFH) physically isolated and programmable only before lockout activation.
Operation modes include standard EPROM-like read (CE/OE low, WE high), byte programming (CE low, WE low, OE high), and hardware data protection via VCC sense (<3.8V inhibition), noise filtering (<15 ns pulse rejection), and multi-signal inhibit logic (OE low / CE high / WE high).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - provides full 512 KB of nonvolatile storage for boot firmware or configuration data |
| Read Access Time | 120 ns - maximum tACC for industrial temperature range (-40°C to +85°C) |
| Byte Programming Time | 50 µs - enables rapid field updates without external high-voltage circuitry |
| Chip Erase Time | 10 seconds - full-array erase completed autonomously after software command initiation |
| Boot Block Size | 16 Kbytes (00000H–03FFFH) - fixed bottom-sector region with optional permanent write lockout |
| Supply Voltage | 5V ±10% - single-rail operation compatible with legacy 5V microcontroller buses |
| Standby Current | 300 µA - CMOS ISB1 spec at industrial temperature, enabling low-power hold states |
Pinout & Package
AT49F040-12JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE, with lead pitch 1.27 mm and body size 13.9 × 13.9 mm. Pin 1 marked by index notch; pins arranged in counter-clockwise order starting from top-left corner in top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing (A0 LSB to A18 MSB) |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface for read data output and program data input |
| CE | Chip Enable | Active-low device select; required low for all operations except standby |
| OE | Output Enable | Active-low read control; places I/O pins in high-Z when high |
| WE | Write Enable | Active-low signal initiating byte programming or command latching |
| VCC | Power Supply | +5V supply pin; must be stable ≥3.8V to permit programming |
| GND | Ground Reference | Signal and power return path; decoupling required near VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Operation | Eliminates need for +12V programming voltage, simplifying PCB design and reducing BOM count |
| DATA Polling Status | I/O7 complements last programmed byte during write; enables precise end-of-program detection without timers |
| Toggle Bit (I/O6) | Toggles during active program/erase; provides asynchronous status feedback independent of address/data |
| Hardware Data Protection | VCC sense, noise filtering, and multi-signal inhibit prevent accidental writes under brown-out or EMI conditions |
| Boot Block Lockout | Irreversible 16-Kbyte sector protection activated via 6-byte command sequence; secures bootloader integrity |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Module |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing reliable code execution on power-up and field firmware updates via RS-485 or CAN interfaces. Use Value: 10,000 write cycles and 300 µA industrial-grade standby current ensure long-term reliability and low maintenance in unattended deployments. | Use Scenario: Holding BIOS initialization code and hardware configuration tables in desktop motherboards using ISA/LPC bus architectures. IC Role / Device Role / Timing Role: Parallel Flash memory mapped into CPU address space for direct XIP (execute-in-place) boot code execution. Use Value: 120 ns read access meets legacy chipset timing requirements while 16-Kbyte boot block prevents corruption of critical POST routines. |
| Embedded Network Router Bootloader | Military Communication Terminal Memory |
Use Scenario: Hosting secure bootloader and recovery image in enterprise-grade network routers requiring remote firmware upgrades. IC Role / Device Role / Timing Role: Field-upgradable firmware storage with hardware lockout protecting first-stage boot code from overwrite during OTA updates. Use Value: Boot block lockout ensures bootloader persistence across 50+ firmware revisions; DATA polling enables deterministic update completion signaling. | Use Scenario: Storing mission-critical initialization sequences and cryptographic keys in ruggedized communication terminals deployed in extended temperature ranges. IC Role / Device Role / Timing Role: Radiation-tolerant (non-EEPROM) nonvolatile memory for cold-start boot sequence in MIL-STD-810G environments. Use Value: Industrial temperature rating (-40°C to +85°C) and 10,000-cycle endurance meet DoD lifecycle requirements for field-deployed hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-120EC | 4 Mbit (512K × 8), 120 ns access, 3.0–3.6V supply - requires dual-voltage support and different command set | Designed for 3.3V systems; incompatible with 5V-only buses without level translation | Select only if migrating to 3.3V platform; not drop-in for AT49F040-12JI's 5V architecture |
| SST39VF040-120-4C-NHE | 4 Mbit (512K × 8), 120 ns access, 3.0–3.6V supply, 100 µA standby - lacks boot block lockout feature | No hardware-protected boot sector; relies on software-based write protection schemes | Use where boot security is managed externally; avoid when immutable bootloader integrity is mandatory |
Compared with AM29LV040B-120EC and SST39VF040-120-4C-NHE, the AT49F040-12JI uniquely delivers 5V-only operation with integrated boot block lockout - eliminating level shifters and providing hardware-enforced firmware partitioning essential for safety-critical boot paths.
Availability
AT49F040-12JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, and embedded network router bootloaders requiring stable component supply across extended lifecycles.
Supply support for AT49F040-12JI 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
Atmel Corporation, now part of Microchip Technology, designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets.
The AT49F040-12JI belongs to Atmel's parallel Flash memory product line, engineered specifically for 5V embedded systems requiring field-upgradable firmware with hardware-secured boot sectors.
FAQ
What is the operating temperature range for the AT49F040-12JI?
The AT49F040-12JI is rated for industrial temperature operation from -40°C to +85°C, as confirmed by Atmel's ordering information table and DC/AC specifications. This range applies to all electrical parameters including 120 ns read access time, 300 µA standby current, and 50 µs byte programming. The "I" suffix in the part number explicitly denotes industrial grade, distinguishing it from commercial-grade variants like AT49F040-12JC.
Does the AT49F040-12JI support in-system programming without high voltage?
Yes, the AT49F040-12JI supports full in-system reprogramming using only 5V - no external high-voltage generator is needed. Its command register architecture accepts six-byte software sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h) to initiate chip erase or boot lockout. This 5V-only capability is central to its design and explicitly stated in the Features section of the datasheet.
How is boot block protection implemented in the AT49F040-12JI?
The AT49F040-12JI implements boot block protection via an irreversible 6-byte command sequence (5555h/AAh → 2AAAh/55h → 5555h/80h → 5555h/AAh → 2AAAh/55h → 5555h/40h) that permanently disables programming and erasure of the 16-Kbyte sector (00000H–03FFFH). Once enabled, the lockout is hardware-enforced and cannot be reversed - verified by reading I/O0 at address 00002H in product ID mode.
What status detection methods does the AT49F040-12JI provide during programming?
The AT49F040-12JI provides two hardware status detection methods: DATA polling (I/O7 complements last written byte until programming completes) and Toggle Bit (I/O6 toggles during active program/erase cycles). Both are usable at any time during the operation and require no external clocks - enabling deterministic, timer-free host synchronization for the AT49F040-12JI's 50 µs byte programming and 10-second chip erase.
Is the AT49F040-12JI pin-compatible with other 32-pin Flash memories?
No - the AT49F040-12JI's pinout is specific to Atmel's parallel Flash family and differs from industry-standard equivalents such as the AM29LV040B or SST39VF040. While all are 32-pin PLCC devices, address pin mapping (e.g., A17/A18 placement), control signal assignment (CE/OE/WE polarity and timing), and command protocol are not interchangeable. Direct replacement requires validation of both physical layout and firmware-level command compatibility for the AT49F040-12JI.
AT49F040-12JI 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:
- 4Mbit
- Memory Organization:
- 512K 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)
AT49F040-12JI FAQ
1.How can I place an order for AT49F040-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040-12JI 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 AT49F040-12JI reliable?
The price and inventory of AT49F040-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040-12JI is usually 5 days.
3.What payment methods are accepted for AT49F040-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040-12JI?
AT49F040-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040-12JI 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 AT49F040-12JI?
For technical support, including AT49F040-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040-12JI requirements.
6.How does Aetrix verify that AT49F040-12JI is sourced from the original manufacturer or authorized distributors?
All AT49F040-12JI 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 AT49F040-12JI meets industry standards.
7.What is the process for return or replacement of AT49F040-12JI?
All AT49F040-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040-12JI, 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 AT49F040-12JI part is unused and in its original packaging.
Return procedure for AT49F040-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F040-12JI Tags
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