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Microchip Technology AT29C040A-10PC
- Part No.:
- AT29C040A-10PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT29C040A-10PC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
AT29C040A-10PC 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 features 100 ns read access time, 5 V ±10% single-supply operation, 2048 × 256-byte sectors, hardware/software data protection, and two 16 KB boot blocks with independent lockout-used in microcontroller-based system startup firmware storage.
For engineers reviewing the AT29C040A-10PC datasheet, AT29C040A-10PC pinout, AT29C040A-10PC application, or AT29C040A-10PC equivalent, key selection criteria include sector-program timing (10 ms), DATA polling/Toggle Bit end-of-write detection, boot block lockout behavior, and compatibility with 5 V TTL/CMOS buses in legacy industrial controller designs.
Technical Context
The AT29C040A-10PC implements a sector-erase-and-program architecture where each 256-byte sector must be fully loaded before internal auto-erase and programming commence. Address latching occurs on falling CE or WE edges, with A0–A7 selecting byte offset and A8–A18 specifying sector address during write pulses.
It supports dual data validation methods: DATA polling via I/O7 complement detection and Toggle Bit monitoring on I/O6 during program/erase cycles. Hardware protection includes VCC sense (<3.8 V inhibit), 5 ms power-on delay, OE/CE/WE state locking, and 15 ns noise filtering on control inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8 bits), organized as 2048 sectors of 256 bytes each |
| Read Access Time | 100 ns max - enables direct execution from flash in 8-bit microcontroller systems without wait states |
| Program Cycle Time | 10 ms per sector - defines minimum time between successive sector writes in firmware update routines |
| Supply Voltage | 5 V ±10% - eliminates need for charge pumps or auxiliary voltage rails in legacy 5 V designs |
| Standby Current | 100 µA typical - supports low-power hold modes in battery-backed industrial controllers |
| Endurance | >10,000 program/erase cycles per sector - ensures field-upgradable firmware reliability over product lifetime |
| Operating Temp | 0°C to +70°C (Commercial) - validated for use in non-extended-temperature industrial enclosures |
Pinout & Package
AT29C040A-10PC is supplied in a 32-lead, 0.600" wide plastic dual in-line package (PDIP), pin-compatible with industry-standard 32-pin EPROM sockets and legacy board layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A7 = byte offset within sector, A8–A18 = sector address |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8-bit microcontrollers; supports byte load and DATA polling on I/O7/I/O6 |
| CE | Chip Enable | Active-low chip select; latches address on falling edge; must be low with OE high and WE low for byte loading |
| OE | Output Enable | Active-low output control; high during programming to disable outputs and prevent bus contention |
| WE | Write Enable | Active-low write strobe; falling edge latches data; used with CE for sector programming and software command entry |
| NC | No Connect | Pin 32 is unconnected - must remain floating; not used for device identification or timing |
Key Features
| Feature | Design Value |
|---|---|
| Two 16 KB Boot Blocks with Independent Lockout | Enables secure storage of primary and fallback boot code; lockout prevents accidental overwrite during field updates |
| Hardware + Software Data Protection | VCC sense, 5 ms power-on delay, and 3-byte unlock sequence prevent unintended writes during brown-out or reset conditions |
| DATA Polling & Toggle Bit Detection | I/O7 complement and I/O6 toggling provide real-time, bus-compatible status feedback without requiring external timers or interrupts |
| Single 5 V Supply Operation | Eliminates need for 12 V programming voltage - simplifies power design and enables in-circuit reprogramming via standard logic-level signals |
| CMOS/TTL Input/Output Compatibility | Supports direct interfacing with both legacy 5 V TTL microcontrollers and modern low-power CMOS peripherals without level shifters |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Code |
|---|---|
Use Scenario: Storing ladder logic interpreter and I/O configuration in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding executable firmware that initializes CPU, configures peripherals, and loads runtime engine at power-up. Use Value: 100 ns read access enables zero-wait-state execution; boot block lockout prevents corruption of critical startup code during remote firmware patches. | Use Scenario: Hosting BIOS-equivalent startup code in medical diagnostic equipment with long product lifecycles and infrequent field updates. IC Role / Device Role / Timing Role: Primary boot ROM providing verified initialization sequence before loading application firmware from secondary storage. Use Value: >10,000 endurance cycles support decade-long service life; software data protection prevents miswrites during power cycling in clinical settings. |
| Automotive Diagnostic Tool Memory | Point-of-Sale Terminal Configuration Storage |
Use Scenario: Holding vehicle protocol stacks (J1850, CAN) and calibration tables in handheld OBD-II scanners used across temperature ranges. IC Role / Device Role / Timing Role: Field-updatable flash memory storing communication firmware and vehicle-specific parameter sets accessed at system boot. Use Value: Commercial-grade 0°C to +70°C rating matches handheld tool thermal profile; sector erase allows selective update of protocol modules without full reflash. | Use Scenario: Storing localized language packs, tax rate tables, and peripheral driver configurations in retail ECR terminals deployed globally. IC Role / Device Role / Timing Role: Configurable nonvolatile memory enabling regional customization and regulatory compliance updates without hardware change. Use Value: 256-byte sector granularity permits fine-grained updates; hardware VCC sense prevents corruption during brief AC line sags in store power systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT29C040-10PC | No software data protection feature enabled by default; lacks SDP enable/disable algorithm and related command sequences | Suitable for cost-sensitive designs where firmware integrity is managed externally | Select when boot block lockout and software protection are unnecessary and legacy compatibility with pre-SDP firmware loaders is required |
| MX29LV040CTTI-10G | 3 V/5 V tolerant supply (VCC = 2.7–3.6 V or 4.5–5.5 V); 70 ns read access; supports CFI query mode | Designed for mixed-voltage systems and newer controllers with 3.3 V I/O; requires different initialization sequence | Select when migrating to lower-power 3.3 V platforms or requiring standardized CFI-compliant firmware update infrastructure |
Compared with AT29C040-10PC, the AT29C040A-10PC adds mandatory software data protection and refined boot block lockout control, while MX29LV040CTTI-10G offers voltage flexibility and faster access but requires redesign of programming firmware and power delivery.
Availability
AT29C040A-10PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot code, and automotive diagnostic tool memory requiring stable component supply and long-term obsolescence management.
Supply support for AT29C040A-10PC 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 acquired Atmel in 2016 and maintains full support for legacy Atmel Flash products including the AT29C040A series.
The AT29C040A belongs to Atmel's 5-volt-only Flash memory family, engineered for drop-in replacement of UV-erasable EPROMs in industrial and telecom systems requiring field-upgradable firmware without high-voltage programming circuitry.
FAQ
What is the maximum read access time specified for the AT29C040A-10PC?
The AT29C040A-10PC has a maximum read access time of 100 ns under commercial temperature and voltage conditions. This value is guaranteed across the full operating range (0°C to +70°C, VCC = 4.5 V to 5.5 V) and enables zero-wait-state operation with many 8-bit and 16-bit microcontrollers. The "-10" suffix in the part number explicitly denotes this 100 ns speed grade, distinguishing it from slower -12 (120 ns) and -15 (150 ns) variants.
Does the AT29C040A-10PC require high-voltage programming signals?
No, the AT29C040A-10PC operates with 5 V only and does not require high-voltage programming signals such as 12 V. All programming commands-including sector erase, byte load, software data protection enable/disable, and boot block lockout-are executed using standard 5 V logic levels applied to CE, WE, OE, and the data bus. This eliminates external charge pumps and simplifies in-system reprogramming in legacy 5 V designs.
How does the boot block lockout feature work on the AT29C040A-10PC?
The AT29C040A-10PC contains two 16 KB boot blocks-one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Each can be independently locked using a seven-command software algorithm. Once activated, the locked block becomes read-only: no erasure or programming is possible, even via chip erase. Lockout status is verified by reading address 0x00002 (lower block) or 0xFFFF2 (upper block), where FF indicates locked and FE indicates unlocked.
What methods are available to detect completion of a program cycle on the AT29C040A-10PC?
The AT29C040A-10PC provides two hardware-supported methods: DATA polling and Toggle Bit detection. In DATA polling, reading the last loaded byte returns its complement on I/O7 until programming completes, then returns true data. In Toggle Bit mode, repeated reads cause I/O6 to toggle between 0 and 1 during programming and stabilize upon completion. Both methods operate over the standard data bus without external components or timers.
Is the AT29C040A-10PC pin-compatible with standard 32-pin EPROM sockets?
Yes, the AT29C040A-10PC uses a 32-lead PDIP package (32P6) with 0.600" width and standard 0.1" pin pitch, matching the footprint and pinout of industry-standard 27C040 and 27C080 EPROMs. This allows direct socket replacement in existing designs without PCB modification, preserving layout, signal routing, and timing margins established for EPROM-based systems.
AT29C040A-10PC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT29C040A-10PC FAQ
1.How can I place an order for AT29C040A-10PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-10PC 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-10PC reliable?
The price and inventory of AT29C040A-10PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-10PC is usually 5 days.
3.What payment methods are accepted for AT29C040A-10PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-10PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-10PC?
AT29C040A-10PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-10PC 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-10PC?
For technical support, including AT29C040A-10PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-10PC requirements.
6.How does Aetrix verify that AT29C040A-10PC is sourced from the original manufacturer or authorized distributors?
All AT29C040A-10PC 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-10PC meets industry standards.
7.What is the process for return or replacement of AT29C040A-10PC?
All AT29C040A-10PC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-10PC, 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-10PC part is unused and in its original packaging.
Return procedure for AT29C040A-10PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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