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Microchip Technology AT29C040A-12TI
- Part No.:
- AT29C040A-12TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C040A-12TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,070
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Product details
Overview
AT29C040A-12TI from Atmel is a 4-megabit (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, and industrial temperature range (–40°C to +85°C). It supports in-system reprogramming via single-cycle erase-and-program, hardware/software data protection, and dual 16K-byte boot blocks with independent lockout - used in embedded firmware storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the AT29C040A-12TI datasheet, AT29C040A-12TI pinout, AT29C040A-12TI application, or AT29C040A-12TI equivalent, key selection considerations include sector-based programming timing (10 ms), DATA polling/Toggle Bit end-of-write detection, CMOS/TTL I/O compatibility, VCC sense-based hardware write inhibit, and PLCC-32/TSOP-32 package options for board-level compatibility with legacy 8-bit microcontroller systems.
Technical Context
The AT29C040A-12TI implements a sector-erase Flash architecture where each of 2048 sectors (256 bytes each) is independently programmable using internal address/data latches and an autonomous control timer. Programming requires no external high voltage - only 5V ±10% supply and standard TTL/CMOS logic levels.
Its dual boot block lockout enables secure firmware partitioning: lower 16K bytes (0x00000–0x03FFF) and upper 16K bytes (0x7C000–0x7FFFF) can be individually protected against accidental overwrite via seven-command software enable sequence. Hardware data protection includes VCC sense (<3.8V inhibition), 5 ms power-on delay, and noise filtering on WE/CE inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), enabling full BIOS/firmware images for 8-bit MCUs without external expansion. |
| Read Access Time | 120 ns max (tACC), compatible with 8 MHz Z80/8051 bus timing without wait states. |
| Sector Size | 256 bytes per sector - matches typical bootloader page boundaries and simplifies firmware update granularity. |
| Program Cycle Time | 10 ms per sector - deterministic timing allows precise host-side timeout management during field updates. |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage rails in system design. |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, motor drives, and telecom line cards. |
| Endurance | >10,000 program/erase cycles per sector - supports frequent field firmware patching over product lifetime. |
| Standby Current | 300 µA max (industrial grade) - critical for low-power battery-backed configuration storage. |
Pinout & Package
AT29C040A-12TI is available in 32-lead PLCC (32J) and TSOP-32 (32T) packages. The industrial-grade variant uses the same pinout across both packages, with NC (No Connect) on Pin 16 in PLCC and Pin 16 in TSOP Type 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit addressing for full 524,288-word space; A8–A18 define sector address during programming. |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path; supports DATA polling on I/O7 and Toggle Bit on I/O6. |
| CE | Chip Enable | Active-low chip select - must be low with OE low and WE high for read; inhibits programming if held high. |
| OE | Output Enable | Active-low output control - places outputs in high-Z when high; required high during byte load/program cycles. |
| WE | Write Enable | Active-low write strobe - initiates byte load on falling edge; combined with CE for sector programming timing. |
| VCC | Power Supply | +5 V ±10% supply - powers core logic and charge pumps; VCC sense disables programming below 3.8 V. |
| GND | Ground Reference | Signal and power ground - decoupling capacitor placement near Pin 16 (PLCC) or Pin 16 (TSOP) minimizes noise during sector writes. |
| NC | No Connect | Pin 16 is unconnected in both PLCC and TSOP packages - must remain floating, not tied to VCC/GND. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle sector erase & program | Eliminates separate erase command - reduces host firmware complexity and update latency. |
| Hardware data protection | VCC sense + 5 ms power-on delay prevents spurious writes during brown-out or cold start. |
| Software data protection | Three-command unlock sequence (AAh/55h/A0h) prevents accidental writes without explicit host authorization. |
| Dual boot block lockout | Independent 16K-byte lockout for lower/upper memory regions - secures primary and fallback firmware images. |
| DATA polling & Toggle Bit | Real-time write completion detection via I/O7 complement or I/O6 toggling - avoids fixed delays and improves update throughput. |
| CMOS standby current | 300 µA max at –40°C to +85°C - extends battery life in always-on configuration storage applications. |
Applications
| Industrial PLC Firmware Storage | Legacy BIOS Module |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in programmable logic controllers deployed in factory-floor environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-level update capability; 120 ns read access ensures real-time scan cycle execution without bus wait states. Use Value: Dual boot block lockout prevents corruption of primary runtime firmware during remote field updates, while 10,000-cycle endurance supports 10+ years of maintenance patches. | Use Scenario: Holding POST routines, hardware initialization code, and CMOS setup data in x86-based industrial motherboards requiring long-term component availability. IC Role / Device Role / Timing Role: EPROM-replacement Flash memory interfaced directly to ISA bus; TTL-compatible I/Os eliminate level-shifting components. Use Value: 5V-only operation and 256-byte sector granularity simplify legacy system redesigns, avoiding costly PCB respins for voltage rail changes. |
| Telecom Line Card Bootloader | Motor Drive Configuration Memory |
Use Scenario: Storing boot code and DSP parameter sets for T1/E1 interface cards operating in central office cabinets with strict thermal management. IC Role / Device Role / Timing Role: Secure boot memory with hardware write-inhibit - VCC sense blocks programming during power-up transients common in shared backplane supplies. Use Value: Industrial temperature rating (–40°C to +85°C) and 300 µA standby current ensure reliable operation in fanless, sealed enclosures. | Use Scenario: Retaining motor calibration coefficients, PID tuning parameters, and safety-critical fault logs in variable-frequency drives subjected to vibration and electrical noise. IC Role / Device Role / Timing Role: Field-updatable configuration store accessed via 8-bit parallel bus; DATA polling enables deterministic firmware recovery after power loss. Use Value: Sector-based programming allows selective update of calibration data without erasing operational logs, reducing downtime during service interventions. |
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 access, 3 V core with 5 V I/O tolerance; requires VPP = 12 V for programming. | Designed for mixed-voltage systems; lacks boot block lockout and software data protection. | Choose for 3.3 V system integration where 5 V I/O compatibility is needed, but verify VPP generation circuitry. |
| SST39VF040-120-4C-NHE | 4 Mbit, 120 ns access, 3.3 V only; uses command register interface instead of toggle-bit polling. | No 5 V operation; different command set and no hardware VCC-sense write inhibit. | Select when migrating to 3.3 V platforms and redesigning firmware for command-register protocol. |
Compared with AT29C040A-12TI, AM29LV040B-120EC adds 3 V core efficiency but introduces high-voltage programming complexity, while SST39VF040-120-4C-NHE offers lower power at 3.3 V but removes 5 V compatibility and hardware safety features critical for industrial retrofit designs.
Availability
AT29C040A-12TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS modules, telecom line card bootloaders, and motor drive configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT29C040A-12TI 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 devices for industrial, automotive, and consumer applications.
The AT29C040A-12TI belongs to Atmel's 5-volt-only Flash family designed specifically for drop-in EPROM replacement in legacy 8-bit systems, emphasizing in-system reprogrammability without high-voltage programming infrastructure.
FAQ
What is the maximum read access time specification for AT29C040A-12TI?
The AT29C040A-12TI has a maximum read access time (tACC) of 120 ns, measured from address valid to valid data on I/O pins under industrial temperature conditions (–40°C to +85°C) and 5 V ±10% supply. This value is guaranteed across the full operating range and aligns with the "-12" speed grade designation in the part number.
Does AT29C040A-12TI require high-voltage programming signals?
No, AT29C040A-12TI does not require high-voltage programming signals. It operates with 5 V ±10% only - all programming commands use standard TTL/CMOS logic levels on CE, WE, and address/data lines. Internal charge pumps generate necessary voltages, eliminating external VPP circuitry.
How many sectors does AT29C040A-12TI have, and what is the size of each sector?
The AT29C040A-12TI contains 2048 sectors, each 256 bytes in size. This sector structure enables granular firmware updates - for example, modifying a single device driver without erasing the entire 4 Mbit array - and matches common bootloader page sizes in 8-bit embedded systems.
What package types are offered for AT29C040A-12TI?
AT29C040A-12TI is offered in two package types: 32-lead PLCC (32J) and 32-lead TSOP Type 1 (32T). Both packages share identical pinouts and electrical characteristics; the choice depends on board assembly requirements - PLCC for through-hole prototyping or socketed designs, TSOP for surface-mount high-density layouts.
Can the boot blocks in AT29C040A-12TI be locked independently?
Yes, AT29C040A-12TI provides independent programming lockout for its two 16K-byte boot blocks - one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Each block can be locked or unlocked separately using distinct seven-command software sequences, enabling flexible secure boot architectures.
AT29C040A-12TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- 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:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT29C040A-12TI FAQ
1.How can I place an order for AT29C040A-12TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-12TI 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-12TI reliable?
The price and inventory of AT29C040A-12TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-12TI is usually 5 days.
3.What payment methods are accepted for AT29C040A-12TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-12TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-12TI?
AT29C040A-12TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-12TI 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-12TI?
For technical support, including AT29C040A-12TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-12TI requirements.
6.How does Aetrix verify that AT29C040A-12TI is sourced from the original manufacturer or authorized distributors?
All AT29C040A-12TI 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-12TI meets industry standards.
7.What is the process for return or replacement of AT29C040A-12TI?
All AT29C040A-12TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-12TI, 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-12TI part is unused and in its original packaging.
Return procedure for AT29C040A-12TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29C040A-12TI Tags
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AT24C02C-XHM-T
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