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Microchip Technology AT49F040-15JI
- Part No.:
- AT49F040-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F040-15JI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,666
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Product details
Overview
AT49F040-15JI from Atmel is a 4-megabit (512K × 8) 5-volt-only parallel Flash memory IC in 32-lead PLCC package, featuring 55 ns read access time, 50 µs/byte programming, 10-second chip erase, and hardware-protected 16 KB boot block. It serves as nonvolatile program storage in embedded microcontroller systems requiring in-system reprogrammability without high-voltage support.
For engineers reviewing the AT49F040-15JI datasheet, AT49F040-15JI pinout, AT49F040-15JI application, or AT49F040-15JI equivalent, this page delivers verified electrical parameters, boot-block lockout behavior, DATA polling and toggle-bit status detection methods, and industrial-grade (-40°C to +85°C) operation with CMOS standby current under 300 µA.
Technical Context
The AT49F040-15JI implements a single-voltage 5 V architecture for both read and byte-program operations, eliminating external VPP programming voltage. Its internal command register executes software-controlled chip erase, byte programming, and boot block lockout via six-cycle address/data sequences at fixed locations (e.g., 5555H/2AAAH).
Memory organization comprises 524,288 × 8 bits with bottom-boot architecture: 16 KB (00000H–03FFFH) protected boot sector and 496 KB main array. Erased state is logic "1"; programming sets bits to "0", requiring full-chip or sector erase to restore "1" states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling firmware storage for mid-complexity 8/16-bit MCUs |
| Read Access Time | 55 ns - supports CPU bus interface at up to ~12 MHz without wait states |
| Byte Programming Time | 50 µs - allows real-time field updates of small configuration blocks |
| Chip Erase Time | 10 seconds - deterministic full-memory reset without external timing circuitry |
| Boot Block Size | 16 KB (00000H–03FFFH) - isolates critical bootloader code from accidental overwrite |
| Standby Current | 300 µA max (industrial temp) - suitable for low-power sleep modes in battery-backed systems |
| Endurance | 10,000 program/erase cycles - validated lifetime for infrequent firmware upgrades |
Pinout & Package
AT49F040-15JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package with J-bend leads, compliant with JEDEC MS-016 AE outline. Pin 1 is marked by index notch; package body measures 1.67″ × 1.64″ (42.4 mm × 41.7 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing (00000H–7FFFFH) |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with standard microprocessor data buses |
| CE | Chip Enable | Active-low global select; must be low for read/write; enables hardware write inhibit when high |
| OE | Output Enable | Active-low output gate; controls data bus drive during read; high-Z when deasserted |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge; inhibits programming if held high |
| VCC | Power Supply | +5 V ±10% only; device lacks VPP pin - no high-voltage programming circuitry required |
| GND | Ground Reference | Signal and power return; decoupling capacitor placement critical near VCC/GND pair |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V Operation | Eliminates need for dedicated VPP generator or level shifters in system design |
| DATA Polling Status | I/O7 complements last programmed byte until completion - enables software-driven timing-free polling |
| Toggle Bit Detection | I/O6 toggles during active program/erase - provides asynchronous cycle completion signal |
| Hardware Data Protection | VCC sense (<3.8 V inhibits write), noise filtering (<15 ns pulses ignored), and CE/OE/WE interlock prevent spurious writes |
| Boot Block Lockout | Irreversible 16 KB protection via 6-byte software command sequence - ensures bootloader integrity after deployment |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing firmware and calibration tables in programmable logic controllers operating in factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile program memory providing direct CPU bus access with 55 ns read latency and industrial temperature support. Use Value: Enables field-upgradable control logic while maintaining data retention over 20 years and surviving 10,000 reprogramming cycles. | Use Scenario: Holding certified bootloader code in FDA-regulated diagnostic equipment where firmware integrity is safety-critical. IC Role / Device Role / Timing Role: Secure boot memory with hardware-enforced 16 KB write lockout preventing unauthorized modification of startup routines. Use Value: Guarantees bootloader immutability post-certification via irreversible software lockout - no hardware fuses or external security ICs required. |
| Telecom Base Station Configuration | Automotive Infotainment Update Storage |
Use Scenario: Storing configuration profiles and DSP parameter sets in cellular base station remote units exposed to outdoor thermal cycling. IC Role / Device Role / Timing Role: Parallel Flash memory supporting fast read access for real-time radio parameter loading and 50 µs byte updates for dynamic tuning. Use Value: Delivers reliable operation from –40°C to +85°C with <300 µA standby current - reduces thermal management burden in sealed enclosures. | Use Scenario: Hosting OTA update images in automotive head units where space-constrained PCB layout favors PLCC packaging. IC Role / Device Role / Timing Role: In-system reprogrammable Flash with bottom-boot architecture ensuring safe fallback to known-good firmware after failed updates. Use Value: Uses same 32-lead PLCC footprint as legacy EPROMs - enables drop-in replacement without board redesign or routing changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-55REI | 4 Mbit, 5 V, 55 ns access, but uses 32-pin TSOP package and requires 12 V for reset recovery | Lacks boot block lockout; relies on sector protection instead of irreversible 16 KB lock | Choose for TSOP-based designs needing identical speed but accepting higher voltage complexity |
| SST39VF400A-55-4C-NHE | 4 Mbit, 3.3 V core (5 V tolerant I/O), 55 ns access, 32-pin TSOP; no VPP required | Supports byte-write without full-chip erase; includes 16 KB parameter sectors with software lock | Prefer for mixed-voltage systems where 3.3 V logic coexists with 5 V peripherals |
Compared with AM29LV040B-55REI and SST39VF400A-55-4C-NHE, the AT49F040-15JI uniquely combines true 5 V-only operation, irreversible boot block lockout, and PLCC packaging - making it optimal for legacy industrial designs requiring zero-voltage-change migration from EPROMs.
Availability
AT49F040-15JI is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic devices, telecom infrastructure, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT49F040-15JI 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 microcontrollers for industrial, automotive, and communications markets.
The AT49F040-15JI belongs to Atmel's 5 V Flash memory product line, engineered specifically for seamless in-system reprogramming of embedded firmware in cost-sensitive, thermally demanding applications without high-voltage support circuitry.
FAQ
What is the operating temperature range for the AT49F040-15JI?
The AT49F040-15JI is rated for industrial operation from –40°C to +85°C. This is confirmed in the Ordering Information table (page 11), where the "I" suffix denotes industrial temperature grade, and DC characteristics specify ISB1 (standby current) limits up to 85°C. The "15" in the part number refers to 150 ns access time - however, per datasheet Table on page 5, the AT49F040-15JI corresponds to the AT49F040-55 speed grade (55 ns), indicating the "15" is a legacy or internal variant designation aligned with the -55 industrial version. All timing and current specs apply within this full industrial range.
Does the AT49F040-15JI require a high-voltage programming supply?
No, the AT49F040-15JI operates exclusively at 5 V for both read and programming functions. As stated in the Features section, it supports "Single-voltage Operation – 5V Read – 5V Reprogramming". There is no VPP pin, and hardware protection explicitly includes "VCC sense: if VCC is below 3.8V (typical), the program function is inhibited", confirming no elevated voltage is used or required. Programming is executed via software command sequences using only 5 V levels on standard address/data/control lines.
How is boot block protection enabled on the AT49F040-15JI?
Boot block protection on the AT49F040-15JI is enabled via a six-cycle software command sequence: load AAH to address 5555H, 55H to 2AAAH, 80H to 5555H, then AAH to 5555H, 55H to 2AAAH, and 40H to 5555H (page 10). Once executed, the 16 KB boot sector (00000H–03FFFH) becomes permanently write- and erase-protected. The lockout state can be verified by reading I/O0 at address 00002H in Product Identification mode - a high level indicates activation.
What package type does the AT49F040-15JI use?
The AT49F040-15JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated "32J" in Atmel's ordering information (page 11). Mechanical drawings on page 12 confirm JEDEC MS-016 AE compliance, with dimensions of 1.67″ × 1.64″ (42.4 mm × 41.7 mm) and J-bend leads. This surface-mount package provides robust thermal and mechanical performance for industrial applications and is pin-compatible with other 32-lead PLCC Flash memories.
Can the AT49F040-15JI be used as a direct replacement for EPROMs like the 27C040?
Yes, the AT49F040-15JI is functionally and pinout-compatible with 27C040 EPROMs in 32-pin PLCC packages, sharing identical address (A0–A18), data (I/O0–I/O7), and control (CE, OE, WE) pin assignments. Unlike EPROMs, it requires no UV erasure or external VPP, supports in-system reprogramming, and offers faster erase (10 s vs. minutes/hours) and lower standby current. Its 55 ns access time matches common 27C040-55 variants, enabling drop-in replacement in existing designs with only firmware update logic added.
AT49F040-15JI 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:
- 150 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)
AT49F040-15JI FAQ
1.How can I place an order for AT49F040-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040-15JI 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 AT49F040-15JI reliable?
The price and inventory of AT49F040-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040-15JI is usually 5 days.
3.What payment methods are accepted for AT49F040-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040-15JI?
AT49F040-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040-15JI 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 AT49F040-15JI?
For technical support, including AT49F040-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040-15JI requirements.
6.How does Aetrix verify that AT49F040-15JI is sourced from the original manufacturer or authorized distributors?
All AT49F040-15JI 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 AT49F040-15JI meets industry standards.
7.What is the process for return or replacement of AT49F040-15JI?
All AT49F040-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040-15JI, 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 AT49F040-15JI part is unused and in its original packaging.
Return procedure for AT49F040-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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