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Microchip Technology AT29C040A-15TI
- Part No.:
- AT29C040A-15TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C040A-15TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,178
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Product details
Overview
AT29C040A-15TI from Atmel is a 4-megabit (512K × 8) 5-volt-only Flash memory IC organized as 524,288 words by 8 bits, featuring 256-byte sector architecture, 150 ns read access time, and industrial temperature range (–40°C to +85°C). It supports in-system reprogramming via single-cycle erase-and-program per sector and integrates hardware/software data protection for embedded firmware storage in microcontroller boot applications.
For engineers reviewing the AT29C040A-15TI datasheet, AT29C040A-15TI pinout, AT29C040A-15TI application, or AT29C040A-15TI equivalent, key selection criteria include sector-based programming timing (10 ms), DATA polling/Toggle Bit end-of-write detection, dual 16K boot block lockout, CMOS/TTL compatibility, and industrial-grade reliability with >10,000 write cycles.
Technical Context
The AT29C040A-15TI implements a sector-erase Flash architecture with 2048 independent 256-byte sectors, each internally latched during byte-load programming. Its control logic uses CE/OE/WE three-line interface with EPROM-like read behavior and dedicated software command sequences (e.g., 5555h/2AAAh) for data protection and product identification.
It features dual-level data security: hardware protection (VCC sense <3.8 V, 5 ms power-on delay, noise filtering on WE/CE) and software protection (three-byte unlock sequence), plus boot block lockout enabled via seven-command algorithm for secure lower/upper 16K regions. Programming completion is verified via I/O7 DATA polling or I/O6 Toggle Bit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), enabling full firmware image storage for 8-bit MCUs |
| Read Access Time | 150 ns max - meets timing requirements for 6.67 MHz bus operation |
| Sector Size | 256 bytes - allows fine-grained firmware updates without erasing entire device |
| Program Cycle Time | 10 ms per sector - enables predictable in-system update latency |
| Endurance | >10,000 write/erase cycles per sector - supports field firmware upgrades over product lifetime |
| Supply Voltage | 5 V ±10% - eliminates need for external voltage translators in legacy 5V systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial control and automotive under-hood environments |
| Standby Current | 300 µA max - reduces power budget in always-on embedded systems |
Pinout & Package
AT29C040A-15TI is packaged in a 32-lead PLCC (32J) with gull-wing leads, JEDEC MS-016 compliant, footprint size 12.46 mm × 14.99 mm × 3.35 mm (max height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 524,288-word addressing; A8–A18 select sector, A0–A7 select byte within sector |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high disables outputs and enables standby mode |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low write strobe; controls byte loading and initiates internal program cycle when CE and OE are properly asserted |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit data path for reading stored firmware or loading new sector data; supports DATA polling on I/O7 and Toggle Bit on I/O6 |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O buffers; VCC sense circuitry inhibits programming if below 3.8 V |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal circuitry |
| NC | No Connect | Unbonded pin; must remain unconnected to avoid unintended coupling or leakage paths |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Reprogramming | Eliminates need for 12V programming supplies, simplifying system power design and enabling true in-circuit updates |
| 256-Byte Sector Architecture | Allows partial firmware updates without erasing unrelated code sections, reducing update risk and downtime |
| Dual 16K Boot Block Lockout | Secures startup code in first/last 16K bytes against accidental overwrite, ensuring system boot integrity |
| Hardware + Software Data Protection | Prevents spurious writes during power-up/down or noise events via VCC sensing, timing delays, and 3-byte unlock sequences |
| DATA Polling & Toggle Bit Detection | Enables real-time program status monitoring without halting host processor - no fixed timeout required |
| CMOS/TTL Input/Output Compatibility | Interoperates directly with legacy 5V microcontrollers, FPGAs, and logic families without level-shifting components |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Boot Code |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-level reprogrammability and hardware write protection to ensure deterministic boot after brownouts. Use Value: Enables remote firmware patches without replacing hardware; 300 µA standby current extends battery-backed runtime during maintenance windows. | Use Scenario: Holding boot loader and safety-critical initialization code in engine control units deployed in under-hood compartments exposed to –40°C cold cranking and +85°C thermal soak. IC Role / Device Role / Timing Role: Secure boot memory with programmable lockout of upper/lower 16K blocks to prevent corruption of bootloader during OTA updates. Use Value: Dual boot block lockout ensures fail-safe recovery path; 10,000-cycle endurance supports multi-year calibration and feature update cycles. |
| Medical Device Configuration Memory | Networking Equipment BIOS Storage |
Use Scenario: Retaining calibrated sensor offsets and regulatory-compliant operational parameters in portable diagnostic equipment requiring traceable configuration history. IC Role / Device Role / Timing Role: Tamper-resistant parameter storage using software data protection to prevent unauthorized modification during service. Use Value: Three-byte unlock sequence ensures only authenticated service tools can modify settings; 150 ns access supports real-time parameter lookup during measurement cycles. | Use Scenario: Hosting BIOS and FPGA configuration bitstreams in enterprise switches where firmware integrity must survive power interruptions during field upgrades. IC Role / Device Role / Timing Role: High-reliability Flash memory with DATA polling support for precise write completion detection in multi-threaded upgrade agents. Use Value: 10 ms sector programming enables atomic firmware commits; Toggle Bit provides secondary verification path for mission-critical deployment validation. |
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 | 4 Mbit, 150 ns access, 3.3 V core with 5 V I/O tolerance; requires VPP = 12 V for programming | Designed for mixed-voltage systems; lacks integrated 5 V-only programming and boot block lockout | Select when migrating to 3.3 V domains with legacy 5 V interface; verify VPP generation capability and absence of boot block security needs |
| SST39VF040-150-4C-NHE | 4 Mbit, 150 ns access, 3.3 V supply; uses different command set and lacks hardware VCC-sense protection | Optimized for low-power portable devices; no industrial temp grade or dual boot block lockout | Choose for cost-sensitive consumer applications where extended temperature range and secure boot are not required |
Compared with AM29LV040B-150EC and SST39VF040-150-4C-NHE, the AT29C040A-15TI uniquely delivers 5 V-only programming, dual 16K boot block lockout, and hardware VCC-sense protection - making it the only option qualified for industrial firmware storage where power stability and boot integrity are non-negotiable.
Availability
AT29C040A-15TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU boot code, medical device configuration memory, and networking equipment BIOS storage requiring stable component supply across extended lifecycle programs.
Supply support for AT29C040A-15TI 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 fabless semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and IoT applications.
The AT29C040A-15TI belongs to Atmel's 5-volt-only Flash family designed specifically for in-system reprogrammability in legacy 5V embedded systems requiring robust firmware storage with sector granularity and hardware-enforced write protection.
FAQ
What is the maximum read access time specified for the AT29C040A-15TI?
The AT29C040A-15TI has a maximum read access time of 150 ns, as confirmed by its ordering code suffix "-15" and AC Read Characteristics table. This timing applies across the full industrial temperature range (–40°C to +85°C) and ensures compatibility with 6.67 MHz system buses. The value is measured from address valid to valid data on I/O0–I/O7 with CE and OE asserted low and WE high.
Does the AT29C040A-15TI require high-voltage programming signals?
No, the AT29C040A-15TI does not require high-voltage programming signals. It is a 5-volt-only Flash device: all programming operations - including sector erase and byte load - are executed using standard 5 V logic levels on CE, OE, and WE pins. Internal charge pumps generate necessary voltages, eliminating external VPP supplies and simplifying system design compared to older EPROM or UV-erasable Flash devices.
How does the boot block lockout feature work on the AT29C040A-15TI?
The AT29C040A-15TI includes 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 against programming via a seven-command software algorithm. Once enabled, the lockout prevents any erase or program operation in that block, preserving critical boot code. Lock status is readable via software product identification mode at addresses 00002H (lower) and 7FFF2H (upper).
What methods are available to detect program completion on the AT29C040A-15TI?
The AT29C040A-15TI supports two hardware-verified methods: DATA polling on I/O7 (complement of loaded data during programming, true data upon completion) and Toggle Bit detection on I/O6 (toggling between 0 and 1 during programming, steady state upon completion). Both methods allow host processors to monitor write status without fixed timeouts, enabling efficient resource utilization during firmware updates.
Is the AT29C040A-15TI compatible with standard EPROM sockets and interfaces?
Yes, the AT29C040A-15TI is pin-compatible with industry-standard 32-pin EPROM packages (PDIP, PLCC, TSOP) and operates with identical CE/OE/WE control timing for read operations. Its outputs are TTL/CMOS compatible, and read behavior mirrors EPROMs: data appears on I/O0–I/O7 when CE and OE are low and WE is high. This allows drop-in replacement in existing EPROM-based designs without board changes.
AT29C040A-15TI 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:
- 150 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-15TI FAQ
1.How can I place an order for AT29C040A-15TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-15TI 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-15TI reliable?
The price and inventory of AT29C040A-15TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-15TI is usually 5 days.
3.What payment methods are accepted for AT29C040A-15TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-15TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-15TI?
AT29C040A-15TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-15TI 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-15TI?
For technical support, including AT29C040A-15TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-15TI requirements.
6.How does Aetrix verify that AT29C040A-15TI is sourced from the original manufacturer or authorized distributors?
All AT29C040A-15TI 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-15TI meets industry standards.
7.What is the process for return or replacement of AT29C040A-15TI?
All AT29C040A-15TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-15TI, 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-15TI part is unused and in its original packaging.
Return procedure for AT29C040A-15TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29C040A-15TI Tags
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