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Microchip Technology AT29C040A-15JC
- Part No.:
- AT29C040A-15JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C040A-15JC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,670
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Product details
Overview
AT29C040A-15JC from Atmel is a 4-Mbit (512K × 8) 5-volt-only Flash memory IC organized in 2048 sectors of 256 bytes each, featuring 150 ns read access time, sector-based reprogramming with internal latches, and hardware/software data protection. It serves as nonvolatile program storage in embedded microcontroller systems requiring in-system reprogrammability without high-voltage programming.
For engineers reviewing the AT29C040A-15JC datasheet, AT29C040A-15JC pinout, AT29C040A-15JC application, or AT29C040A-15JC equivalent, this page delivers verified technical context, sector-program timing, boot block lockout behavior, DATA polling and toggle-bit status detection, and real-world design implications for industrial firmware storage and BIOS/UEFI code retention.
Technical Context
The AT29C040A-15JC implements a sector-erase-and-program architecture where each 256-byte sector is erased and written in a single internal cycle using an on-chip timer; address and data are latched internally during byte load, freeing the bus for concurrent operations. Programming requires no external high voltage-only standard 5V ±10% supply and valid WE/CE/OE control sequences.
It supports dual data-status methods: DATA polling on I/O7 (complement-to-data during programming, true data upon completion) and toggle-bit detection on I/O6 (toggling until program end). Boot block lockout applies independently to two 16K-byte regions (lowest and highest addresses), disabling erase/write permanently once enabled via a 7-command sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling full firmware images for 8-bit MCUs or boot code for 16/32-bit processors |
| Read Access Time | 150 ns max - defines minimum CPU wait-state requirement for zero-wait-state operation at ≤6.67 MHz bus clock |
| Sector Size | 256 bytes - matches typical MCU page-write buffer sizes and enables fine-grained firmware updates without full chip erase |
| Program Cycle Time | 10 ms per sector - determines maximum firmware patch rate (100 sectors/sec) and impacts system update latency |
| Endurance | >10,000 write/erase cycles per sector - supports field-upgradable devices with multi-year over-the-air update schedules |
| VCC Supply | 5 V ±10% - eliminates need for dedicated programming voltage rails; compatible with legacy 5V logic systems |
| Standby Current | 100 µA (CMOS) - enables low-power retention in battery-backed embedded controllers during sleep modes |
Pinout & Package
AT29C040A-15JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 compliant, with 1.27 mm pitch, 12.45 mm × 14.95 mm body, and pin 1 identifier notch. Pin layout supports standard 5V parallel memory bus interfacing with no level-shifting required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A8–A18 select sector, A0–A7 select byte within sector |
| CE | Chip Enable | Active-low chip select; must be low for read or program; high disables outputs and enters CMOS standby mode |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention; must be high during program cycles |
| WE | Write Enable | Active-low write strobe; controls byte loading and initiates internal program cycle when CE is also low |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit data path for read, byte load, and status polling; I/O7 used for DATA polling, I/O6 for toggle-bit detection |
| NC | No Connect | Unbonded pin; must remain unconnected per Atmel design - no pull-up/down or routing allowed |
| VCC | Power Supply | +5 V ±10% main supply; powers core logic and I/O drivers; decoupling capacitor required near pin |
| GND | Ground Reference | Signal and power ground return; separate analog/digital grounding not required due to CMOS architecture |
Key Features
| Feature | Design Value |
|---|---|
| Two Independent 16K-Byte Boot Blocks | Enables secure bootloader storage with permanent lockout-prevents accidental overwrite of startup code in field-deployed systems |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), 5 ms power-on delay, and noise filtering (<15 ns pulses ignored) prevent spurious writes during brown-out or EMI events |
| Software Data Protection | Three-command enable/disable sequence (AAh/55h/A0h or 80h/AAh/55h/20h) secures all sectors against unauthorized firmware modification |
| Internal Address/Data Latching | Latches full 256-byte sector data and address during byte load phase-eliminates need for external address/data hold logic in host controller |
| DATA Polling & Toggle Bit | Dual asynchronous status reporting: I/O7 complement indicates active programming; I/O6 toggling provides alternative polling channel for robust interrupt-driven firmware updates |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS/UEFI Code Retention |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in harsh factory environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile program memory holding runtime firmware; accessed via parallel bus during cold start and updated via in-system programming during maintenance windows. Use Value: Sector-level erasure allows incremental updates without full chip reflash; 10,000-cycle endurance supports >5 years of quarterly firmware patches under industrial duty cycles. |
Use Scenario: Holding BIOS initialization code and hardware configuration tables in desktop motherboards and industrial single-board computers using legacy 5V ISA or LPC interfaces. IC Role / Device Role / Timing Role: Boot ROM replacement for EPROMs; provides faster 150 ns read access than 27C040 EPROMs while retaining identical pinout and voltage compatibility. Use Value: Boot block lockout prevents corruption of critical startup routines during OS-level flash utilities; hardware VCC sensing blocks writes during power ramp-up. |
| Embedded Medical Device Bootloader | Automotive Instrument Cluster Code Storage |
Use Scenario: Secure bootloader storage in Class II medical devices requiring FDA-compliant firmware integrity, with field-upgrade capability and tamper-resistant code protection. IC Role / Device Role / Timing Role: Primary boot memory containing signed verification routines; loaded at power-on reset before application code execution begins. Use Value: Software data protection + independent boot block lockout ensures bootloader remains immutable unless explicitly unlocked via authenticated service tool-meeting IEC 62304 traceability requirements. |
Use Scenario: Storing gauge calibration data and display firmware in automotive instrument clusters operating across -40°C to +85°C ambient range with stringent EMC immunity. IC Role / Device Role / Timing Role: Nonvolatile storage for cluster microcontroller firmware; accessed via 5V parallel interface synchronized to vehicle battery voltage transitions. Use Value: Industrial-grade temperature rating (-40°C to +85°C), 100 µA standby current minimizes parasitic drain on vehicle battery during ignition-off periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-150EC | 3.3 V core with 5 V tolerant I/O; 150 ns access; 4 Mbit density; sector size 64 KB (not 256 B) | Requires level-shifting for pure 5 V systems; larger erase granularity limits partial firmware updates | Select only if migrating to 3.3 V system architecture; not drop-in for AT29C040A-15JC's 5 V-only bus |
| MX29LV040CTTI-15G | 3.3 V supply; 150 ns access; 4 Mbit; 64 KB sectors; supports CFI query mode | Not 5 V compatible; lacks hardware boot block lockout; uses different command set for protection | Use only in new 3.3 V designs with CFI-aware bootloaders; incompatible with AT29C040A-15JC's software protection algorithm |
Compared with AM29LV040B-150EC and MX29LV040CTTI-15G, the AT29C040A-15JC uniquely delivers true 5 V-only operation, 256-byte sector granularity for precise firmware patching, and dual hardware/software lockout mechanisms-making it irreplaceable in legacy 5 V embedded systems requiring field-upgradable, tamper-resistant boot code storage.
Availability
AT29C040A-15JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS/UEFI code retention, and embedded medical device bootloader applications requiring stable component supply and long-term obsolescence management.
Supply support for AT29C040A-15JC 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, nonvolatile memory, and secure authentication ICs, with a legacy of high-reliability Flash products for industrial and automotive markets.
The AT29C040A-15JC belongs to Atmel's 5-volt-only Flash memory product line, designed specifically for seamless EPROM replacement in legacy 5V systems requiring in-system reprogrammability without high-voltage programming infrastructure.
FAQ
What is the maximum operating temperature range for the AT29C040A-15JC?
The AT29C040A-15JC is rated for industrial operation from –40°C to +85°C, as confirmed by its ordering code suffix "I" (AT29C040A-15JI) and validated in the DC and AC Operating Range table. This makes the AT29C040A-15JC suitable for deployment in demanding environments such as factory automation controllers and automotive under-hood modules where thermal stability is critical.
Does the AT29C040A-15JC support true 5 V-only programming without external high voltage?
Yes, the AT29C040A-15JC performs all erase and program operations using only a single 5 V ±10% supply-no external 12 V or higher programming voltage is required. This is a defining feature of Atmel's 5-volt-only Flash family, and the AT29C040A-15JC implements internal charge pumps and timing control to achieve full sector reprogramming under standard logic supply conditions.
How does boot block lockout work on the AT29C040A-15JC?
The AT29C040A-15JC contains two 16K-byte boot blocks-one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Lockout is enabled independently per block via a 7-command software sequence. Once activated, that block becomes permanently read-only: no erase or program commands affect it, and chip erase is disabled if either block is locked. The AT29C040A-15JC supports software detection of lockout status via reads at 0x00002H and 0x7FFF2H.
Can the AT29C040A-15JC be used as a direct replacement for the AT29C040A-12JC or AT29C040A-90JC?
Yes-the AT29C040A-15JC is pin-compatible and functionally identical to other speed grades in the AT29C040A family, differing only in maximum access time (150 ns vs. 120 ns or 90 ns) and corresponding AC timing parameters. All share the same pinout, command set, sector architecture, and protection features. System timing margins must accommodate the slower 150 ns access, but no PCB or firmware changes are needed for substitution.
What package type does the AT29C040A-15JC use, and is it RoHS compliant?
The AT29C040A-15JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated "32J" in Atmel's ordering information. While the original datasheet predates RoHS enforcement, current production lots from authorized distributors (e.g., Digi-Key, Arrow) carry RoHS-compliant labeling and meet lead-free soldering requirements. Always verify compliance via the lot-specific Certificate of Conformance provided with shipment of AT29C040A-15JC units.
AT29C040A-15JC 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:
- 10ms
- Access Time:
- 150 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)
AT29C040A-15JC FAQ
1.How can I place an order for AT29C040A-15JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-15JC 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 AT29C040A-15JC reliable?
The price and inventory of AT29C040A-15JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-15JC is usually 5 days.
3.What payment methods are accepted for AT29C040A-15JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-15JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-15JC?
AT29C040A-15JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-15JC 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 AT29C040A-15JC?
For technical support, including AT29C040A-15JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-15JC requirements.
6.How does Aetrix verify that AT29C040A-15JC is sourced from the original manufacturer or authorized distributors?
All AT29C040A-15JC 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 AT29C040A-15JC meets industry standards.
7.What is the process for return or replacement of AT29C040A-15JC?
All AT29C040A-15JC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-15JC, 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 AT29C040A-15JC part is unused and in its original packaging.
Return procedure for AT29C040A-15JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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