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Microchip Technology AT49LV040-70TI
- Part No.:
- AT49LV040-70TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49LV040-70TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,132
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Product details
Overview
AT49LV040-70TI from Atmel is a 4-megabit (512K × 8) single-voltage Flash memory IC operating at 3.0V–3.6V, featuring 70 ns read access time, 16 KB boot block with programmable lockout, and 10,000 write/erase cycles. It serves as nonvolatile program storage in embedded microcontroller systems requiring in-system reprogrammability without high-voltage programming.
For engineers reviewing the AT49LV040-70TI datasheet, AT49LV040-70TI pinout, AT49LV040-70TI application, or AT49LV040-70TI equivalent, key selection considerations include boot-sector protection logic, 30 µs byte-programming timing, CMOS standby current of 50 µA, and compatibility with standard 32-pin PLCC/TSOP footprints for legacy industrial controller upgrades.
Technical Context
The AT49LV040-70TI implements a bottom-boot architecture with fixed 16 KB protected sector (00000H–03FFFH), enabling secure bootloader storage while allowing main array (496 KB) updates via six-byte software command sequences. Its internal program control logic eliminates external high-voltage generators.
Read operation follows EPROM-like timing: data appears on I/O0–I/O7 when CE and OE are low and WE is high; outputs enter high-impedance state if either CE or OE goes high. Erase and program cycles use Data Polling (I/O7 complement) or Toggle Bit (I/O6 toggling) for cycle completion detection without external clocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - supports full firmware images for 8-bit microcontrollers with minimal address decoding. |
| Read Access Time | 70 ns - enables direct interface to 14 MHz Z80 or 8051 derivatives without wait states. |
| Supply Voltage | 3.0V–3.6V - compatible with modern 3.3V logic rails and eliminates need for dual-voltage regulators. |
| Boot Block Size | 16 KB (00000H–03FFFH) - isolates critical startup code from field updates to prevent bricking during firmware patches. |
| Byte Programming Time | 30 µs typical - allows real-time parameter logging at ≥33 kB/s sustained write rate. |
| Chip Erase Time | 10 seconds max - enables full-field firmware replacement within acceptable maintenance windows. |
| Endurance | 10,000 write/erase cycles - sufficient for >5 years of daily configuration updates in industrial HMI applications. |
| Standby Current | 50 µA CMOS - extends battery life in portable diagnostic tools using backup coin-cell power. |
Pinout & Package
AT49LV040-70TI is available in 32-lead TSOP (8 × 14 mm, package code 32V) and PLCC (32J) packages. Pin functions are identical across both packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0 least significant bit. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; tristated during read/write transitions to prevent bus contention. |
| CE | Chip Enable | Active-low chip select; must be stable before address setup to meet tCS = 0 ns requirement. |
| OE | Output Enable | Active-low output control; used with CE to implement dual-line bus arbitration per JEDEC standards. |
| WE | Write Enable | Active-low write strobe; latches address on falling edge and data on rising edge for byte programming. |
| VCC | Power Supply | 3.0V–3.6V supply; hardware data protection disables programming if VCC < 1.8V. |
| GND | Ground Reference | Signal and power ground common to all I/O and control pins; decoupling required per 0.1 µF near VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Bottom Boot Block Lockout | Software-enabled permanent write protection for 16 KB sector (00000H–03FFFH), preventing accidental bootloader corruption during field updates. |
| Data Polling Detection | I/O7 returns complement of programmed data until completion, enabling host MCU to poll status without timers or interrupts. |
| Toggle Bit Status Monitoring | I/O6 toggles during erase/program cycles, providing asynchronous completion signal usable with any microcontroller GPIO. |
| Hardware Data Protection | Three-layer safeguard: VCC sense (<1.8V inhibits programming), control-line inhibit (OE low/CE high/WE high), and 15 ns noise filter on WE/CE inputs. |
| Input Voltage Tolerance | Address and control inputs accept 0–5.5V signals while powered at 3.0V–3.6V, simplifying level-shifting in mixed-voltage systems. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing ladder logic programs and I/O mapping tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile program memory with boot-sector protection ensuring safe firmware upgrades without disrupting runtime control loops. Use Value: 10,000 endurance cycles support >10 years of scheduled firmware revisions; 50 µA standby current minimizes power draw during PLC sleep modes. | Use Scenario: Retaining calibration coefficients, patient history logs, and safety-critical boot code in portable ultrasound and infusion pump systems. IC Role / Device Role / Timing Role: Secure configuration storage with hardware write-inhibit and voltage-sense protection to prevent data loss during battery swaps. Use Value: Bottom-boot architecture isolates FDA-required bootloader from user-modifiable parameters; 30 µs byte programming enables real-time sensor offset adjustments. |
| Automotive Diagnostic Tool Memory | Legacy Embedded Controller Upgrade |
Use Scenario: Holding OBD-II protocol stacks and vehicle-specific DTC databases in handheld scan tools operating across temperature ranges from −40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-rated Flash memory serving as field-upgradable code repository with deterministic 70 ns read latency for real-time CAN message parsing. Use Value: Industrial-grade −40°C to +85°C operation ensures reliability in under-hood test environments; 3.0V–3.6V supply matches automotive 3.3V rail specifications. | Use Scenario: Replacing obsolete EPROMs (e.g., 27C040) in legacy industrial motion controllers where PCB layout prohibits redesign. IC Role / Device Role / Timing Role: Pin-compatible Flash replacement with identical 32-pin TSOP/PLCC footprint and EPROM-style read protocol. Use Value: Eliminates UV erasers and high-voltage programmers; software-controlled erase/program allows in-situ firmware patches without removing the board. |
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-NHE | 4 Mbit, 70 ns access, 3.0V–3.6V, but uses top-boot architecture and lacks hardware VCC-sense protection. | Boot sector located at highest addresses (7C000H–7FFFFH); requires firmware relocation for drop-in replacement. | Select when top-boot layout aligns with existing bootloader design and voltage monitoring is handled externally. |
| MX29LV400CTT-70G | 4 Mbit, 70 ns, 3.0V–3.6V, bottom-boot, but requires 12V VPP for sector erase and has 200 ms typical sector erase time. | Not suitable for in-system programming without high-voltage circuitry; incompatible with AT49LV040-70TI's zero-VPP architecture. | Choose only if legacy system already includes 12V programming supply and can tolerate longer erase latency. |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTT-70G, the AT49LV040-70TI uniquely combines bottom-boot protection, zero-VPP programming, and hardware VCC-sense - making it the only option that guarantees safe in-system firmware updates on existing 3.3V-only PCBs without layout changes or external voltage generation.
Availability
AT49LV040-70TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive diagnostic tool memory requiring stable component supply across extended temperature ranges.
Supply support for AT49LV040-70TI 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, designs high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and aerospace applications.
The AT49LV series targets legacy system upgrades requiring EPROM-compatible Flash with enhanced security features like boot-block lockout and hardware voltage sensing - specifically for cost-sensitive, long-lifecycle embedded controllers.
FAQ
What is the maximum operating temperature range for the AT49LV040-70TI?
The AT49LV040-70TI is rated for industrial temperature operation from −40°C to +85°C, as confirmed by its ordering suffix "TI" and the DC/AC operating range table in the official Atmel datasheet. This specification ensures reliable performance in harsh environments such as factory floors and automotive under-hood applications where thermal cycling exceeds commercial-grade limits. The AT49LV040-70TI maintains full 70 ns read access time and 30 µs byte programming timing across this entire range.
Does the AT49LV040-70TI require external high-voltage programming circuitry?
No, the AT49LV040-70TI does not require external high-voltage programming circuitry. It operates with a single 3.0V–3.6V supply for both read and write operations, using internally generated programming voltages. All erase and program commands are executed via six-byte software sequences applied to standard address/data buses - eliminating the need for 12V VPP generators or UV erasers. This feature is explicitly documented in the "To allow for simple in-system reprogrammability" section of the AT49LV040-70TI datasheet.
How is boot block protection enabled on the AT49LV040-70TI?
Boot block protection on the AT49LV040-70TI is enabled by executing a specific six-byte software command sequence: load 0xAA to address 5555H, 0x55 to 2AAAH, then 0x80 to 5555H, followed by 0xAA to 5555H, 0x55 to 2AAAH, and finally 0x40 to 5555H. After a 1-second pause, the boot sector (00000H–03FFFH) becomes permanently write-protected. This process is detailed in the "Boot Block Lockout Feature Enable Algorithm" section of the AT49LV040-70TI datasheet and verified by the manufacturer code 1FH and device code 13H response during product identification mode.
Can the AT49LV040-70TI be used as a direct replacement for the AT29LV040A?
No, the AT49LV040-70TI is not a direct replacement for the AT29LV040A. While both are 4 Mbit Flash devices with 3.0V–3.6V operation, the AT29LV040A uses a different command set (e.g., 0x555/0x2AA addressing), lacks the dedicated 16 KB bottom-boot lockout feature, and has slower 90 ns read access time. The AT49LV040-70TI's unique six-byte erase/lock sequences and 70 ns timing require firmware-level adaptation. Cross-reference validation confirms no pinout or timing compatibility exists between these two families.
What packaging options are available for the AT49LV040-70TI?
The AT49LV040-70TI is offered in three packaging variants: 32-lead PLCC (package code 32J), 32-lead TSOP with 8 × 20 mm footprint (32T), and 32-lead TSOP with compact 8 × 14 mm footprint (32V). All share identical pinout and electrical characteristics. The "TI" suffix denotes industrial temperature rating and applies uniformly across these packages. Mechanical dimensions and land patterns are defined in JEDEC standards MS-016 AE (PLCC) and MO-142 BA (TSOP), as specified in the AT49LV040-70TI datasheet packaging information section.
AT49LV040-70TI 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:
- 50µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49LV040-70TI FAQ
1.How can I place an order for AT49LV040-70TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV040-70TI 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 AT49LV040-70TI reliable?
The price and inventory of AT49LV040-70TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV040-70TI is usually 5 days.
3.What payment methods are accepted for AT49LV040-70TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV040-70TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV040-70TI?
AT49LV040-70TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV040-70TI 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 AT49LV040-70TI?
For technical support, including AT49LV040-70TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV040-70TI requirements.
6.How does Aetrix verify that AT49LV040-70TI is sourced from the original manufacturer or authorized distributors?
All AT49LV040-70TI 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 AT49LV040-70TI meets industry standards.
7.What is the process for return or replacement of AT49LV040-70TI?
All AT49LV040-70TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV040-70TI, 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 AT49LV040-70TI part is unused and in its original packaging.
Return procedure for AT49LV040-70TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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