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Microchip Technology AT29LV040A-20TC
- Part No.:
- AT29LV040A-20TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29LV040A-20TC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,985
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Product details
Overview
AT29LV040A-20TC from Atmel is a 4-Mbit (512K × 8) 3.3V-only Flash memory IC organized as 524,288 words by 8 bits, featuring 2048 × 256-byte sectors, 20 ms max sector program time, and 150 ns read access. It supports in-system reprogramming via software data protection and includes two 16K-byte boot blocks with independent lockout for secure firmware storage in embedded controllers.
For engineers reviewing the AT29LV040A-20TC datasheet, AT29LV040A-20TC pinout, AT29LV040A-20TC application, or AT29LV040A-20TC equivalent, key selection criteria include sector-based erase/program architecture, CMOS/TTL-compatible I/O, boot block lockout capability, DATA polling and toggle-bit end-of-program detection, and industrial temperature support (–40°C to +85°C).
Technical Context
The AT29LV040A-20TC implements a sector-erase Flash architecture with internal address/data latches for 256-byte loads, automatic erase-before-program sequencing, and dual-line chip enable (CE)/output enable (OE) control to prevent bus contention. Its programming algorithm requires a three-byte command sequence (5555H/2AAAH/A0H) followed by byte-by-byte loading within 150 µs intervals.
Hardware protections include VCC sense (<1.8V inhibit), 10 ms power-on delay, noise filtering (<15 ns pulse rejection), and CE/OE/WE state-dependent program inhibition. Input levels tolerate 0–5.5V on address/control pins while I/O lines are limited to 0–3.6V, enabling mixed-voltage system interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling firmware storage for mid-complexity microcontrollers without external expansion. |
| Read Access Time | 200 ns max (tACC), compatible with 5 MHz bus timing in legacy 8/16-bit embedded systems. |
| Supply Voltage | 3.3 V ± 0.3 V only - eliminates need for 5V/12V programming supplies and simplifies power design. |
| Active Current | 15 mA max at 5 MHz - enables low-power operation in battery-backed or energy-constrained applications. |
| Standby Current | 50 µA max (industrial temp), reducing quiescent power in always-on systems like industrial PLCs. |
| Sector Size | 256 bytes per sector - allows fine-grained firmware updates without erasing full device contents. |
| Endurance | 10,000 write/erase cycles per sector - supports field-upgradable firmware with multi-year service life. |
Pinout & Package
AT29LV040A-20TC is housed in a 32-lead Thin Small Outline Package (TSOP, Type 1), compliant with JEDEC MO-142 BD, measuring 20.0 mm × 8.0 mm × 1.2 mm (max height). Pin 1 identifier is marked with a notch or dot; package is Pb/halide-free per ordering code suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A7 select byte within 256-byte sector during programming. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access; inhibits programming if held high. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, preventing bus conflicts. |
| WE | Write Enable | Active-low write control; initiates byte load during programming; must be high during read operations. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit multiplexed data path for read outputs and program inputs; supports DATA polling on I/O7 and toggle-bit detection on I/O6. |
| GND / VCC | Power Terminals | GND (Pin 16), VCC (Pin 32); decoupling capacitor required near VCC to maintain stable 3.3V supply during sector programming. |
| NC | No Connect | Pins 15 and 31 are unconnected - must remain floating; no external pull-up/down required. |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555H/2AAAH/A0H) prevents accidental writes - essential for field-deployed firmware integrity. |
| Boot Block Lockout | Two independent 16K-byte blocks (lowest/highest addresses) can be permanently locked to protect bootloader code from overwrite. |
| DATA Polling & Toggle Bit | I/O7 complement-read and I/O6 toggling provide real-time, hardware-agnostic program completion signaling without timer dependencies. |
| Single-Cycle Sector Erase/Program | Entire 256-byte sector erased and programmed in ≤20 ms - eliminates separate erase step and reduces update latency. |
| CMOS/TTL-Compatible I/O | Input thresholds (VIL = 0.6 V, VIH = 2.0 V) and output drive (VOH = 2.4 V @ –100 µA) ensure interoperability with both logic families. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
|
Use Scenario: Storing firmware and configuration data in programmable logic controllers operating in harsh factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-level update capability and boot block lockout to preserve critical startup routines. Use Value: Enables remote firmware patches without full device reflash; 10,000-cycle endurance supports multi-year maintenance cycles in unattended deployments. |
Use Scenario: Holding certified bootloader and safety-critical initialization code in Class II medical instruments requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure, lockable memory region ensuring bootloader integrity and preventing unauthorized modification of startup sequences. Use Value: Dual boot blocks allow fail-safe fallback execution; industrial temperature rating (–40°C to +85°C) ensures reliability across clinical and transport conditions. |
| Automotive Body Control Module | Legacy Industrial HMI Controller |
|
Use Scenario: Storing calibration tables and feature-enabling parameters in body control units where ECU reprogramming occurs over CAN diagnostics. IC Role / Device Role / Timing Role: In-system programmable Flash with 3.3V-only interface, eliminating level-shifting circuitry in 3.3V microcontroller domains. Use Value: 200 ns read access meets timing budgets of 8051- and ARM7-based BCUs; software protection prevents corruption during voltage transients on vehicle power rails. |
Use Scenario: Replacing obsolete EPROMs in aging human-machine interface controllers used in manufacturing test equipment. IC Role / Device Role / Timing Role: Drop-in replacement for 27C040 EPROMs with identical pinout (32-pin TSOP), supporting same PCB layout and address decoding. Use Value: Eliminates UV-erasure requirement and socket-based programming; 150 µA standby current extends uptime in mains-powered but intermittently active systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-70-4C-EKE | 4 Mbit, 70 ns access, 3.3V supply, 48-pin TSOP; lacks boot block lockout and uses different command set. | Higher speed but larger footprint; no dedicated boot protection - requires external software safeguards. | Select when faster read performance is prioritized over secure bootloader isolation. |
| MX29LV400CBTI-70G | 4 Mbit, 70 ns access, 3.3V supply, 48-pin TSOP; includes CFI compliance and top/bottom boot block options. | CFI support simplifies auto-detection in generic flash programmers; boot block size differs (8K/16K vs. AT29LV040A's fixed 16K). | Choose for standardized flash abstraction layers or when migrating from other Macronix-based designs. |
Compared with SST39VF400A-70-4C-EKE and MX29LV400CBTI-70G, the AT29LV040A-20TC offers tighter integration of boot block lockout and sector programming in a compact 32-pin TSOP, making it optimal for space-constrained legacy upgrades where firmware security and pin compatibility are primary concerns.
Availability
AT29LV040A-20TC is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT29LV040A-20TC 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, nonvolatile memory, and secure authentication solutions for embedded systems.
The AT29LV040A belongs to Atmel's 3.3V-only Flash memory product line, designed specifically for in-system programmability, firmware upgradability, and robust operation in industrial and automotive control applications.
FAQ
What is the maximum operating temperature range for the AT29LV040A-20TC?
The AT29LV040A-20TC is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in Section 6 of the datasheet under "DC and AC Operating Range", where the "-20" speed grade and "TC" suffix denote TSOP packaging and industrial-grade thermal performance. The device maintains full functionality-including 200 ns read access and 20 ms sector programming-across this full range.
Does the AT29LV040A-20TC require external high-voltage programming signals?
No, the AT29LV040A-20TC operates exclusively from a 3.3V supply and does not require external 12V or 5V programming voltages. Programming is enabled through a software-controlled three-byte unlock sequence (5555H/2AAAH/A0H) applied via standard I/O lines, making it compatible with in-system reprogramming using only the host microcontroller's native 3.3V interface.
How is end-of-program detection implemented in the AT29LV040A-20TC?
The AT29LV040A-20TC provides two hardware-supported methods: DATA polling on I/O7 (complement of last loaded byte until completion) and toggle-bit detection on I/O6 (repeated reads cause I/O6 to alternate until programming finishes). Both mechanisms eliminate the need for fixed-timing delays and allow deterministic synchronization in real-time firmware update routines.
Can both boot blocks in the AT29LV040A-20TC be locked independently?
Yes, the AT29LV040A-20TC features two 16K-byte boot blocks-one at the lowest addresses (00000H–03FFFH) and one at the highest (FC000H–FFFFFH)-each with independent lockout activation. Section 4.9 confirms that the lockout feature can be enabled separately for either block using a seven-command algorithm, and once activated, prevents all erase and program operations to that specific block.
What package type does the AT29LV040A-20TC use, and is it RoHS-compliant?
The AT29LV040A-20TC uses a 32-lead Thin Small Outline Package (TSOP, Type 1), per JEDEC MO-142 BD. As stated in Section 26.2 and Feature list, it is offered in a green (Pb/halide-free) packaging option, meeting RoHS Directive 2011/65/EU requirements. The "TC" suffix explicitly denotes TSOP packaging with commercial/industrial temperature grading.
AT29LV040A-20TC 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:
- 20ms
- Access Time:
- 200 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT29LV040A-20TC FAQ
1.How can I place an order for AT29LV040A-20TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV040A-20TC 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 AT29LV040A-20TC reliable?
The price and inventory of AT29LV040A-20TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV040A-20TC is usually 5 days.
3.What payment methods are accepted for AT29LV040A-20TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV040A-20TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV040A-20TC?
AT29LV040A-20TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV040A-20TC 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 AT29LV040A-20TC?
For technical support, including AT29LV040A-20TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV040A-20TC requirements.
6.How does Aetrix verify that AT29LV040A-20TC is sourced from the original manufacturer or authorized distributors?
All AT29LV040A-20TC 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 AT29LV040A-20TC meets industry standards.
7.What is the process for return or replacement of AT29LV040A-20TC?
All AT29LV040A-20TC units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV040A-20TC, 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 AT29LV040A-20TC part is unused and in its original packaging.
Return procedure for AT29LV040A-20TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29LV040A-20TC Tags
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