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Microchip Technology AT49F040-12JC
- Part No.:
- AT49F040-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F040-12JC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,803
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Product details
Overview
AT49F040-12JC from Atmel is a 4-megabit (512K × 8) 5-volt-only parallel Flash memory IC in 32-lead PLCC package, featuring 120 ns maximum read access time, 50 µs/byte programming, and 10-second chip erase - used for firmware storage and boot code retention in embedded controllers and industrial PLCs.
For engineers reviewing the AT49F040-12JC datasheet, AT49F040-12JC pinout, AT49F040-12JC application, or AT49F040-12JC equivalent, key selection considerations include boot block lockout support, 5V-only operation without high-voltage programming, DATA polling/Toggle Bit end-of-cycle detection, and compatibility with legacy EPROM-based address/data bus interfaces.
Technical Context
The AT49F040-12JC implements a single-voltage 5V Flash architecture with internal program control logic and hardware data protection including VCC sense (<3.8V inhibit), noise filtering (<15 ns pulse rejection), and dual-line enable control (CE/OE). Its memory array is partitioned into a 16 KB boot block (00000H–03FFFH) and 496 KB main memory.
Operation modes include standard EPROM-like read (CE/OE low, WE high), byte programming via 4-bus-cycle command sequences, and software-controlled chip erase using six-byte command sequences at specific addresses (e.g., 5555H/2AAAH). Boot block lockout is enabled permanently via a dedicated 6-cycle command sequence and verified by reading I/O0 at address 00002H in product ID mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), enabling full firmware images for 8-bit microcontrollers |
| Read Access Time | 120 ns max - supports direct interface to 8-MHz Z80 or 68K-based systems without wait states |
| Byte Programming Time | 50 µs typical - allows rapid field updates of configuration data or calibration tables |
| Chip Erase Time | 10 seconds max - enables full reprogramming in production test or field recovery |
| Boot Block Size | 16 KB (00000H–03FFFH) - reserves lowest-address region for secure bootloader code |
| End-of-Cycle Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed timing delays in host firmware |
| Power Dissipation | 275 mW active (50 mA @ 5V), 100 µA CMOS standby - suitable for low-power industrial modules |
Pinout & Package
AT49F040-12JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE, with 1.27 mm pitch, 1.64–1.67 mm body height, and lead coplanarity ≤0.10 mm. Pin 1 marked by index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A17 used for main memory, A18 selects boot vs. main region |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path; I/O0 indicates boot lockout status during product ID mode; I/O6 = Toggle Bit; I/O7 = DATA polling indicator |
| CE | Chip Enable | Active-low global enable; must be low for read/write; high-Z output when high; used with OE for bus contention control |
| OE | Output Enable | Active-low output gate; controls data bus drivers independently of CE; required low for read access |
| WE | Write Enable | Active-low write strobe; latches address on falling edge, data on rising edge; must be low for programming/erase commands |
| VCC | Power Supply | +5.0 V ±10%; powers core logic and I/O buffers; VCC sense circuit disables programming if <3.8 V |
| GND | Ground | Reference for all inputs/outputs; decoupling capacitor required near pin for stable read/write timing |
Key Features
| Feature | Design Value |
|---|---|
| 5V-only operation | Eliminates need for +12V programming supply - simplifies power design and enables in-system reprogramming via standard logic-level signals |
| 16 KB boot block with lockout | Prevents accidental overwrite of bootloader code after activation - ensures system recoverability even during main memory field updates |
| Hardware data protection | Combines VCC monitoring, noise filtering, and multi-signal inhibit (OE high / CE high / WE high) to prevent spurious writes in electrically noisy environments |
| DATA polling & Toggle Bit | Allows host processor to poll completion asynchronously - removes dependency on fixed timing margins and improves system responsiveness |
| 10,000 write/erase cycles | Supports long-term field deployment in applications requiring periodic firmware or parameter updates (e.g., HVAC controllers, metering devices) |
Applications
| Industrial PLC Firmware Storage | Legacy System EPROM Replacement |
|---|---|
|
Use Scenario: Storing ladder logic programs and I/O configuration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI. IC Role / Device Role / Timing Role: Nonvolatile firmware storage device with 120 ns read access, directly interfaced to 80C32 or 80C188 CPU address/data buses. Use Value: Boot block lockout prevents corruption of startup routines during remote firmware updates; 100 µA standby current extends battery backup runtime during power loss. |
Use Scenario: Drop-in replacement for obsolete 27C040 EPROMs in legacy test equipment and medical analyzers where UV erasure is no longer feasible. IC Role / Device Role / Timing Role: Pin-compatible Flash memory emulating EPROM read behavior while adding in-circuit reprogrammability. Use Value: Eliminates need for EPROM programmers and UV erasers; 5V-only operation avoids redesign of existing 5V-only PCBs. |
| Embedded Controller Bootloader | Communications Module Configuration Storage |
|
Use Scenario: Holding secure boot code in network routers and base station controllers that require tamper-resistant initialization sequences before loading application firmware. IC Role / Device Role / Timing Role: Boot block-resident bootloader executing immediately after reset; main memory stores upgradable application image. Use Value: Permanent boot lockout ensures bootloader integrity across 10,000+ field updates; DATA polling enables deterministic boot timing. |
Use Scenario: Storing protocol stacks, MAC addresses, and calibration coefficients in cellular IoT modules deployed in remote telemetry applications. IC Role / Device Role / Timing Role: Configuration nonvolatile memory accessed during power-up and firmware update sequences via SPI-to-parallel bridge or direct CPU interface. Use Value: 50 µs/byte programming allows fast over-the-air parameter updates; 10-second chip erase enables full module reconfiguration in under 15 seconds. |
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, 120 ns, 3.3V/5V tolerant, 48-pin TSOP; requires VPP = 12V for sector erase in some modes | Supports mixed-voltage systems; lacks dedicated boot block lockout - uses sector protection instead | Choose for designs needing 3.3V compatibility or higher pin count flexibility; verify VPP sourcing if using sector erase |
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns, 3.3V only, 48-pin TSOP; includes 4× 8-KB parameter sectors and 1× 32-KB boot sector | Higher speed but incompatible voltage domain; boot sector protection is reversible, not permanent | Choose for 3.3V systems requiring faster access; avoid if permanent boot lockout or 5V-only operation is mandatory |
Compared with AM29LV040B-120EC and SST39VF400A-70-4C-NHE, the AT49F040-12JC uniquely delivers permanent 16 KB boot lockout, 5V-only simplicity, and PLCC packaging - making it optimal for industrial retrofits and legacy 5V controller upgrades where voltage tolerance and reversible protection are unnecessary.
Availability
AT49F040-12JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy EPROM replacement, and embedded controller bootloader applications requiring stable component supply, long-lifecycle support, and RoHS-compliant PLCC packaging.
Supply support for AT49F040-12JC 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 fabless semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs.
The AT49F040-12JC belongs to Atmel's parallel Flash memory product line, designed specifically for 5V in-system programmable firmware storage in industrial, telecom, and embedded control applications.
FAQ
What is the operating temperature range for the AT49F040-12JC?
The AT49F040-12JC is rated for commercial temperature operation from 0°C to +70°C. It is packaged in a 32-lead PLCC (32J) and specified with 120 ns maximum access time across this range. Industrial-grade variants (e.g., AT49F040-12JI) extend operation to –40°C to +85°C, but the -12JC suffix explicitly denotes the commercial grade.
Does the AT49F040-12JC support true in-system programming without high voltage?
Yes, the AT49F040-12JC supports full in-system programming using only 5V - no external VPP or high-voltage generator is required. All operations (read, byte program, chip erase, boot lockout) are executed via 5V-only command sequences written to specific address/data locations, making it compatible with standard logic-level microcontroller interfaces.
How is boot block protection activated and verified on the AT49F040-12JC?
Boot block lockout on the AT49F040-12JC is activated by issuing a six-cycle command sequence (AAh → 55h → 80h → AAh → 55h → 40h) to addresses 5555h/2AAAh. Once enabled, it is permanent. Verification is done by entering software product identification mode and reading I/O0 at address 00002h: a logic high confirms lockout is active.
What are the key timing parameters for read and write operations on the AT49F040-12JC?
The AT49F040-12JC specifies tACC and tCE at 120 ns maximum for read access, tBP at 50 µs typical for byte programming, and tEC at 10 seconds maximum for chip erase. Write pulse width (tWP) is 90 ns minimum, and address/data setup/hold times are defined down to 0 ns for CE-controlled operations - enabling tight integration with fast 8-bit CPUs.
Can the AT49F040-12JC be used as a direct replacement for a 27C040 EPROM?
Yes, the AT49F040-12JC is functionally and pinout-compatible with the 27C040 EPROM in read mode (CE/OE low, WE high), delivering identical 512K × 8 organization and parallel interface. Unlike the EPROM, it adds in-system reprogrammability, hardware write protection, and boot block security - requiring only minor firmware changes to implement programming sequences.
AT49F040-12JC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F040-12JC FAQ
1.How can I place an order for AT49F040-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040-12JC 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 AT49F040-12JC reliable?
The price and inventory of AT49F040-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040-12JC is usually 5 days.
3.What payment methods are accepted for AT49F040-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040-12JC?
AT49F040-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040-12JC 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 AT49F040-12JC?
For technical support, including AT49F040-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040-12JC requirements.
6.How does Aetrix verify that AT49F040-12JC is sourced from the original manufacturer or authorized distributors?
All AT49F040-12JC 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 AT49F040-12JC meets industry standards.
7.What is the process for return or replacement of AT49F040-12JC?
All AT49F040-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040-12JC, 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 AT49F040-12JC part is unused and in its original packaging.
Return procedure for AT49F040-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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