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Microchip Technology AT29C040A-10PI
- Part No.:
- AT29C040A-10PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT29C040A-10PI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,762
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Product details
Overview
AT29C040A-10PI from Microchip Technology (formerly Atmel) is a 4-Mbit (512K × 8) CMOS Flash memory IC designed for in-system reprogrammability in embedded boot code storage. It operates exclusively from a single 5V ±10% supply, delivers 100 ns read access time, supports 256-byte sector programming with internal latching, and features hardware and software data protection. It is used in industrial microcontroller boot loaders where reliable firmware update capability and EEPROM-like endurance are required.
For engineers reviewing the AT29C040A-10PI datasheet, AT29C040A-10PI pinout, AT29C040A-10PI application, or AT29C040A-10PI equivalent, key selection criteria include sector-based reprogramming timing (10 ms), dual 16 KB boot block lockout, DATA polling/Toggle Bit program status detection, and industrial temperature operation (−40°C to +85°C) in PDIP-32 package.
Technical Context
The AT29C040A-10PI implements a sector-erase-and-program architecture with 2048 independent 256-byte sectors. Its internal control logic handles automatic erase-before-write sequencing, eliminating external high-voltage circuitry. Address and data latches free the bus during programming, enabling background operations.
It supports two distinct data protection mechanisms: hardware-level VCC sensing (inhibits programming below 3.8 V) and software-controlled 3-byte command sequence (enables/disables write protection globally). Boot block lockout uses a 7-command algorithm to permanently disable programming of either the lower or upper 16 KB region.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8 bits) - provides sufficient space for full boot firmware images in resource-constrained systems |
| Read Access Time | 100 ns - enables direct execution from flash (XIP) in timing-critical MCU boot sequences |
| Sector Size | 256 bytes - allows fine-grained firmware updates without erasing entire device |
| Program Cycle Time | 10 ms per sector - defines minimum time between successive sector writes during field updates |
| Endurance | >10,000 write/erase cycles per sector - ensures long-term reliability in devices requiring frequent firmware patches |
| Operating Voltage | 5 V ±10% - eliminates need for dedicated programming voltage rails or charge pumps |
| Temperature Range | −40°C to +85°C - qualified for industrial-grade embedded applications including motor drives and PLCs |
| Standby Current | 100 µA - minimizes power draw in always-on systems during idle periods |
Pinout & Package
AT29C040A-10PI is supplied in a 32-lead Plastic Dual Inline Package (PDIP), 0.600" wide, with standard through-hole mounting. Pin functions are electrically identical to TSOP variants but physically arranged for DIP layout compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A7 select byte within sector, A8–A18 select sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8-bit microcontrollers; supports byte load and DATA polling on I/O7 |
| CE | Chip Enable | Active-low chip select; must be low for read, program, or identification modes; controls device power state |
| OE | Output Enable | Active-low output control; high-Z when high, enables bus sharing; must be high during programming |
| WE | Write Enable | Active-low write strobe; initiates byte load and sector programming; toggling enables Toggle Bit detection |
| NC | No Connect | Unbonded pin; no electrical function; must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Data Protection | VCC sense (3.8 V threshold), 5 ms power-on delay, and noise filtering (15 ns pulse rejection) prevent accidental writes during brown-out or EMI events |
| Software Data Protection | Three-byte unlock sequence (5555H/2AAAH/5555H) required before each sector program cycle; remains active across power cycles |
| Dual Boot Block Lockout | Independent 16 KB blocks at 0x00000–0x03FFF and 0x7C000–0x7FFFF support secure boot from either low or high memory addresses |
| Program Status Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) provide real-time feedback without external timers or interrupts |
| Internal Latching Architecture | Latches 256 bytes of sector data internally during load phase, freeing address/data bus for concurrent system operations |
Applications
| Industrial PLC Firmware Storage | Embedded Motor Control Boot Loader |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in factory environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding initialization code and runtime configuration; accessed at power-up and during over-the-air updates. Use Value: Industrial temperature rating (−40°C to +85°C) and hardware data protection ensure reliable operation during voltage transients common in industrial power distribution. | Use Scenario: Hosting bootloader and safety-critical startup routines for brushless DC motor controllers in HVAC and industrial automation systems. IC Role / Device Role / Timing Role: Primary boot ROM mapped into MCU reset vector space; supports in-field firmware patching via CAN or UART without removing PCB. Use Value: Sector-based programming (256-byte granularity) enables safe incremental updates while preserving validated motor calibration tables in locked boot blocks. |
| Medical Diagnostic Equipment BIOS | Telecom Remote Terminal Configuration |
Use Scenario: Storing certified diagnostic imaging firmware and regulatory compliance metadata in Class II medical devices requiring traceable firmware revisions. IC Role / Device Role / Timing Role: Secure, tamper-resistant firmware repository with software data protection enabled to prevent unauthorized modification. Use Value: >10,000 endurance cycles and boot block lockout allow repeated firmware validation and version rollbacks during clinical deployment and regulatory audits. | Use Scenario: Holding configuration profiles and protocol stacks for outdoor DSLAM remote terminals exposed to extended thermal cycling and humidity. IC Role / Device Role / Timing Role: Field-upgradable configuration store accessed by embedded ARM processor during cold start and network re-synchronization. Use Value: 100 µA standby current extends battery backup life during grid outages; PDIP-32 package simplifies manual replacement in legacy field units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT29C040-10PI | Legacy version without software data protection enable/disable commands; lacks SDP feature and product identification mode | Not suitable for systems requiring field-programmable write protection or automated part identification | Select AT29C040A-10PI when secure firmware updates or system-level device enumeration are required |
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns access, 3.3 V operation; requires separate 12 V for boot block protection; no Toggle Bit | Designed for 3.3 V systems; incompatible voltage domain and protection scheme | Choose only if migrating to 3.3 V platform and accepting higher programming complexity |
Compared with AT29C040-10PI and SST39VF400A-70-4C-NHE, the AT29C040A-10PI uniquely combines 5 V-only operation, integrated software/hardware protection, and dual boot block lockout in a single industrial-grade PDIP package-making it optimal for legacy 5 V embedded systems requiring field-upgradable, tamper-resistant firmware storage.
Availability
AT29C040A-10PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded motor control boot loader, and medical diagnostic equipment BIOS requiring stable component supply across extended lifecycle programs.
Supply support for AT29C040A-10PI 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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog components, and nonvolatile memory solutions for industrial, automotive, and communications markets.
The AT29C040A product line delivers 5-volt-only Flash memory optimized for in-system reprogrammability in legacy embedded systems, emphasizing robustness, sector-level flexibility, and secure boot code storage.
FAQ
What is the maximum operating temperature range for the AT29C040A-10PI?
The AT29C040A-10PI is rated for industrial operation from −40°C to +85°C. This specification is confirmed in the Ordering Information table and DC/AC Operating Range section of the official datasheet. The "I" suffix in the part number explicitly denotes industrial temperature qualification. AT29C040A-10PI maintains full functionality-including 100 ns read access, 10 ms sector programming, and hardware data protection-across this full range.
Does the AT29C040A-10PI require external high-voltage programming signals?
No, the AT29C040A-10PI does not require external high-voltage programming signals. It is a 5-volt-only device: all read, program, and erase operations execute using only the standard VCC supply (5 V ±10%). Programming is initiated via standard logic-level WE and CE pulses, with internal circuitry handling erase-and-write sequencing. This eliminates the need for 12 V programming rails or charge pumps-confirmed in the Features list and Device Operation section.
How does the boot block lockout feature work on the AT29C040A-10PI?
The AT29C040A-10PI contains two 16 KB boot blocks-one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Lockout is enabled via a 7-command software algorithm that permanently disables programming and erasure of the selected block. Once activated, the locked block retains its contents across power cycles and prevents chip erase. AT29C040A-10PI supports independent lockout of either or both blocks, as detailed in the Boot Block Lockout Feature Enable Algorithm.
Can the AT29C040A-10PI be used in place of the AT29C040-10PI?
Yes, the AT29C040A-10PI is a functional upgrade of the AT29C040-10PI and maintains pin-for-pin and software compatibility. However, AT29C040A-10PI adds critical features absent in the older version: software data protection (SDP), product identification mode (manufacturer/device codes 1F/A4), and enhanced boot block lockout. Systems relying solely on hardware protection will operate identically, but new designs should leverage AT29C040A-10PI's expanded security capabilities.
What methods are available to detect program completion on the AT29C040A-10PI?
The AT29C040A-10PI provides two hardware-supported methods: DATA polling and Toggle Bit detection. During programming, reading the last loaded byte returns the complement on I/O7 (DATA polling); alternatively, I/O6 toggles between 0 and 1 until completion (Toggle Bit). Both methods are valid at any time during the 10 ms cycle and require no external timing components-fully documented in the Device Operation section and supported across all operating temperatures for AT29C040A-10PI.
AT29C040A-10PI 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:
- 100 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-10PI FAQ
1.How can I place an order for AT29C040A-10PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-10PI 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-10PI reliable?
The price and inventory of AT29C040A-10PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-10PI is usually 5 days.
3.What payment methods are accepted for AT29C040A-10PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-10PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-10PI?
AT29C040A-10PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-10PI 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-10PI?
For technical support, including AT29C040A-10PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-10PI requirements.
6.How does Aetrix verify that AT29C040A-10PI is sourced from the original manufacturer or authorized distributors?
All AT29C040A-10PI 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-10PI meets industry standards.
7.What is the process for return or replacement of AT29C040A-10PI?
All AT29C040A-10PI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-10PI, 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-10PI part is unused and in its original packaging.
Return procedure for AT29C040A-10PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29C040A-10PI Tags
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