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Microchip Technology AT29C040A-12PI
- Part No.:
- AT29C040A-12PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT29C040A-12PI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT29C040A-12PI from Atmel is a 4-Mbit (512K × 8) 5-volt-only Flash memory IC organized as 524,288 words by 8 bits, featuring 90 ns read access time, 256-byte sector architecture, hardware/software data protection, and two 16K-byte boot blocks with independent programming lockout - used in embedded firmware storage for industrial controllers requiring in-system reprogrammability.
For engineers reviewing the AT29C040A-12PI datasheet, AT29C040A-12PI pinout, AT29C040A-12PI application, or AT29C040A-12PI equivalent, this page delivers verified timing specs, sector-program behavior, boot-block lockout logic, DATA polling and TOGGLE BIT status detection methods, and industrial-grade (-40°C to +85°C) operation under 5V ±10% supply.
Technical Context
The AT29C040A-12PI implements sector-based reprogramming: each 256-byte sector is erased and programmed in a single internal cycle with 10 ms typical duration, using latched address/data and automatic internal control timer. It supports both WE- and CE-controlled byte loading with 150 µs inter-byte timing constraint.
It integrates dual-layer data protection: hardware-level VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and software-controlled 3-byte unlock sequence (AAh/55h/A0h) before any sector write. Boot block lockout uses a 7-command enable algorithm and persists across power cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling full firmware image storage for mid-complexity microcontrollers |
| Read Access Time | 120 ns max (tACC), compatible with 8 MHz bus timing in legacy industrial systems |
| Sector Size | 256 bytes per sector, allowing fine-grained firmware updates without full chip erase |
| Program Cycle Time | 10 ms typical per sector, enabling predictable update latency in field-deployed devices |
| Endurance | >10,000 program/erase cycles per sector, supporting long-life field maintenance |
| Supply Voltage | 5 V ±10%, eliminating need for dedicated programming voltage rails |
| Operating Temperature | -40°C to +85°C (industrial grade), validated for factory automation and motor drives |
Pinout & Package
AT29C040A-12PI is supplied in a 32-lead Plastic Dual Inline Package (PDIP), 0.600" wide (32P6), with through-hole mounting and industry-standard footprint.
| 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 byte load; high disables outputs and inhibits programming |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low control for byte loading and sector programming initiation; paired with CE for dual-signal safety |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit CMOS/TTL-compatible data path; I/O7 used for DATA polling, I/O6 for TOGGLE BIT status monitoring |
| VCC | Power Supply | +5 V ±10% main supply; powers core logic and I/O buffers |
| GND | Ground Reference | Signal and power return; required for stable 5V operation and noise immunity |
| NC | No Connect | Unbonded pin; must remain unconnected to avoid parasitic coupling or latch-up risk |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Reprogramming | Eliminates need for 12V programming supplies, simplifying PCB design and reducing BOM count |
| 2048 × 256-Byte Sectors | Enables modular firmware updates - only modified sectors require reprogramming, minimizing downtime |
| Hardware Data Protection | VCC sense, 5 ms power-on delay, and noise filtering prevent accidental writes during brown-out or EMI events |
| Boot Block Lockout | Independent 16K-byte lockout for upper/lower memory regions secures bootloader code against corruption |
| DATA Polling & TOGGLE BIT | Dual asynchronous status reporting via I/O7 and I/O6 allows real-time program completion detection without timers |
Applications
| Firmware Storage in PLCs | Industrial HMI Configuration Memory |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O mapping tables in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-level update capability and boot block lockout to preserve startup routines. Use Value: Enables field firmware patches without full chip erase; lockout prevents accidental overwrite of critical boot code during remote updates. |
Use Scenario: Retaining display configuration, language packs, and calibration data in human-machine interface terminals operating in harsh industrial settings. IC Role / Device Role / Timing Role: Reliable parameter storage with 10,000-cycle endurance and -40°C to +85°C operation for long-term deployment. Use Value: Maintains user-specific settings across power cycles and firmware upgrades; low 100 µA standby current extends backup battery life. |
| Embedded Controller Bootloader Storage | Legacy Instrumentation Firmware Archive |
Use Scenario: Hosting secure bootloader code in microcontroller-based motor drives where firmware integrity is safety-critical. IC Role / Device Role / Timing Role: Dual 16K boot blocks store primary and fallback bootloaders, independently lockable to prevent corruption. Use Value: Ensures fail-safe recovery: if primary bootloader fails, locked secondary block remains intact and executable. |
Use Scenario: Archiving calibration constants and device-specific firmware revisions in test and measurement equipment with 15+ year service life. IC Role / Device Role / Timing Role: High-reliability Flash memory with 90 ns read access and proven >10,000 cycle endurance for infrequent updates. Use Value: Guarantees data retention over decades; 5V-only operation avoids voltage translation complexity in aging designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV400CBTI-70G | 3.3V core supply (5V I/O tolerant), 70 ns access, 512K × 8 organization, CFI-compliant command set | Requires level-shifting for pure 5V systems; lacks boot block lockout; supports JEDEC-standard erase commands | Preferred when migrating to lower-power 3.3V systems with CFI-based toolchain support |
| AM29LV400BT-70REF | 3.3V supply, 70 ns access, same density, top-boot configuration, no software data protection | Boot block layout differs (top vs. dual); no SDP feature; requires external hardware write protect for security | Used where top-boot alignment matches existing board layout and external hardware protection suffices |
Compared with MX29LV400CBTI-70G and AM29LV400BT-70REF, the AT29C040A-12PI provides native 5V-only operation, dual independent boot block lockout, and integrated software data protection - making it uniquely suited for legacy 5V industrial systems requiring robust, self-contained firmware security without external components.
Availability
AT29C040A-12PI is available at Aetrix Electronics and suitable for industrial automation, embedded controller firmware storage, and legacy instrumentation requiring stable component supply with long lifecycle support.
Supply support for AT29C040A-12PI 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.
The AT29C040A-12PI belongs to Atmel's 5-volt-only Flash family, designed specifically for in-system reprogrammability in industrial and automotive applications where high-voltage programming is impractical.
FAQ
What is the maximum read access time for the AT29C040A-12PI?
The AT29C040A-12PI has a maximum address-to-output delay (tACC) of 120 ns, as specified in its industrial-grade (-40°C to +85°C) timing bin. This value is guaranteed across temperature and voltage extremes and enables compatibility with 8 MHz system buses. The "12" in the part number directly denotes this 120 ns speed grade, distinguishing it from faster (90 ns) or slower (150 ns, 200 ns) variants.
Does the AT29C040A-12PI support in-system programming without high voltage?
Yes, the AT29C040A-12PI supports true 5-volt-only in-system programming: no external 12V supply is needed. Programming is initiated via standard 5V command sequences (e.g., AAh/55h/A0h for software data protection unlock), and all internal erase and program operations are powered solely from VCC = 5V ±10%. This eliminates high-voltage circuitry and simplifies field update infrastructure.
How does the boot block lockout function work on the AT29C040A-12PI?
The AT29C040A-12PI features two independent 16K-byte boot blocks - one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Each can be permanently locked via a 7-command software algorithm. Once enabled, that block becomes read-only: no erase or program commands affect it, even during chip erase. Lockout state persists across power cycles and is detectable via software product identification mode.
What methods are available to detect end-of-program on the AT29C040A-12PI?
The AT29C040A-12PI provides two hardware-supported status detection methods: DATA polling (monitoring complement-to-data on I/O7) and TOGGLE BIT (observing I/O6 toggling between 0 and 1). Both operate asynchronously during programming and require no external clock or timer. Either method confirms completion before initiating the next read or write cycle, ensuring deterministic firmware update sequencing.
Is the AT29C040A-12PI pin-compatible with other densities in Atmel's 5V Flash family?
No, the AT29C040A-12PI is not pin-compatible with lower-density members like the AT29C020 (2 Mbit) or AT29C010 (1 Mbit), due to differing address pin counts (A0–A18 vs. A0–A16/A0–A15). However, it shares identical pinout, timing model, and command set with same-density variants (e.g., AT29C040A-90PI, AT29C040A-15PI), differing only in tACC specification and temperature grading.
AT29C040A-12PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT29C040A-12PI FAQ
1.How can I place an order for AT29C040A-12PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-12PI 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-12PI reliable?
The price and inventory of AT29C040A-12PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-12PI is usually 5 days.
3.What payment methods are accepted for AT29C040A-12PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-12PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-12PI?
AT29C040A-12PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-12PI 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-12PI?
For technical support, including AT29C040A-12PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-12PI requirements.
6.How does Aetrix verify that AT29C040A-12PI is sourced from the original manufacturer or authorized distributors?
All AT29C040A-12PI 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-12PI meets industry standards.
7.What is the process for return or replacement of AT29C040A-12PI?
All AT29C040A-12PI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-12PI, 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-12PI part is unused and in its original packaging.
Return procedure for AT29C040A-12PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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