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Microchip Technology AT29LV256-15TI
- Part No.:
- AT29LV256-15TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT29LV256-15TI.pdf
- Description:
- IC FLASH 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,204
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Product details
Overview
AT29LV256-15TI from Atmel is a 3.3V-only, 256 Kbit (32K × 8) Flash memory IC designed for in-system reprogrammability in embedded control and firmware storage applications. It delivers 150 ns read access time, 20 ms max sector program cycle time, 15 mA active current, 40 µA CMOS standby current, and supports 512 sectors of 64 bytes each with software data protection.
For engineers reviewing the AT29LV256-15TI datasheet, AT29LV256-15TI pinout, AT29LV256-15TI application, or AT29LV256-15TI equivalent, key selection considerations include industrial temperature range (-40°C to +85°C), TSOP-28 package compatibility, sector-based programming architecture, DATA polling and toggle-bit end-of-program detection, and 3.3V-only operation without high-voltage programming signals.
Technical Context
The AT29LV256-15TI implements a sector-erase-and-program architecture where each of its 512 sectors (64 bytes) is independently reprogrammable via a three-byte software command sequence. Internal address and data latches capture full 64-byte sectors at microprocessor speed before initiating automatic erase-and-program cycles controlled by an on-chip timer.
It supports standard parallel interface timing with CE/OE/WE controls, TTL/CMOS-compatible I/Os, and dual-level hardware protection (VCC sense, noise filtering, and control-line inhibit). Input levels tolerate up to 5.5V on address/control pins while I/O pins are limited to 0–3.6V, enabling mixed-voltage system interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8), sufficient for boot code or configuration data in microcontroller-based systems |
| Read Access Time | 150 ns - enables direct execution from flash in 8-bit bus systems operating up to ~5 MHz |
| Supply Voltage | 3.3 V ± 0.3 V - eliminates need for 5V or 12V programming supplies, simplifying power design |
| Active Current | 15 mA - low enough for battery-backed or portable embedded applications during read operations |
| Standby Current | 40 µA (CMOS) - supports ultra-low-power sleep modes in industrial controllers and IoT edge nodes |
| Sector Size | 64 bytes - allows fine-grained firmware updates without erasing entire device or disrupting adjacent code |
| Endurance | >10,000 write/erase cycles per sector - suitable for field-upgradable firmware with moderate update frequency |
Pinout & Package
AT29LV256-15TI is packaged in a 28-lead Thin Small Outline Package (TSOP Type 1), compliant with JEDEC MO-153, with 0.55 mm lead pitch and body dimensions 11.8 × 10.0 mm. Pin 1 is marked by a beveled corner and located at top-left when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; A0–A5 select byte within 64-byte sector during programming |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path for reads, byte loads, and software identification; driven to 3.6V max |
| CE | Chip Enable | Active-low chip select; must be stable before address setup; inhibits programming if high |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high; required high during programming |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge; used with CE for byte load timing |
| VCC | Power Supply | +3.3 V supply input; includes internal VCC sense circuitry that disables programming below 1.8 V |
| GND | Ground | Reference return for all signals and power; decoupling capacitor placement critical near this pin |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (AAh→55h→A0h) prevents accidental writes - essential for field-deployed firmware integrity |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggling provide real-time, non-intrusive program completion detection without external timers |
| Sector-Based Programming | Independent 64-byte sector erase/program eliminates need for full-chip erase - reduces update latency and wear leveling overhead |
| Industrial Temperature Range | -40°C to +85°C operation validated across full voltage and timing specs - suitable for automotive ECUs and factory automation |
| Input Voltage Tolerance | Address/control inputs accept 0–5.5 V logic levels while maintaining 3.3 V I/O - eases interface with legacy 5V microcontrollers |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers deployed in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; provides deterministic 150 ns read access for real-time instruction fetch. Use Value: Enables remote firmware updates without hardware intervention, while 40 µA standby current extends uptime during maintenance windows. |
Use Scenario: Holding certified bootloader and safety-critical initialization routines in Class II medical instruments requiring traceable, tamper-resistant memory. IC Role / Device Role / Timing Role: Secure, sector-protected firmware repository; software lock prevents unauthorized modification during device power-on self-test. Use Value: >10,000 endurance cycles support regulatory-mandated field updates; industrial temp rating ensures reliability in sterilized enclosures. |
| Automotive Body Control Module | Point-of-Sale Terminal Configuration Memory |
|
Use Scenario: Retaining vehicle-specific configuration data (e.g., door lock logic, lighting profiles) across ignition cycles in BCMs operating under engine bay thermal stress. IC Role / Device Role / Timing Role: Electrically erasable, 3.3V-only memory with hardware VCC-sense protection against brown-out induced corruption. Use Value: 20 ms sector program time allows fast parameter updates during service mode; TSOP-28 footprint minimizes PCB area in space-constrained modules. |
Use Scenario: Storing localized language packs, tax rate tables, and peripheral driver settings in retail terminals subject to frequent regional deployment changes. IC Role / Device Role / Timing Role: Field-upgradable nonvolatile storage with software-locked sectors preventing accidental overwrite of certified configurations. Use Value: 64-byte sector granularity permits updating single language strings without disturbing payment processing firmware; 15 mA active current supports USB-powered operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF200A-70-4C-NHE | 2 Mbit density, 70 ns access, 3.3V operation, 1024 sectors (256 bytes/sector) | Higher capacity and faster access, but larger sector size reduces granularity for small updates | Choose when firmware image exceeds 256 Kbit or sub-150 ns timing is required; verify sector management logic compatibility |
| MX29LV256ETTI-90G | 256 Mbit density, 90 ns access, 3.3V, 512 sectors (512 bytes/sector), supports CFI query | Massively higher density and standardized interface, but incompatible sector size and command set | Prefer for new designs needing scalability; not drop-in due to differing sector architecture and timing requirements |
Compared with SST39VF200A-70-4C-NHE and MX29LV256ETTI-90G, the AT29LV256-15TI offers optimal balance of proven 256 Kbit capacity, 64-byte sector precision, and industrial-grade reliability - making it ideal for cost-sensitive, space-constrained embedded systems where firmware update frequency and thermal robustness are prioritized over raw speed or density.
Availability
AT29LV256-15TI is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive body electronics, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT29LV256-15TI 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, nonvolatile memory, and secure authentication ICs for embedded applications.
The AT29LV256-15TI belongs to Atmel's LV-series Flash memory family, engineered specifically for 3.3V-only in-system programmability in industrial and automotive environments where reliability, low power, and software-controlled security are mandatory.
FAQ
What is the operating temperature range for the AT29LV256-15TI?
The AT29LV256-15TI is rated for industrial temperature operation from -40°C to +85°C. This specification is validated across all DC and AC parameters including 150 ns read access time, 15 mA active current, and 40 µA standby current - ensuring reliable performance in harsh environments such as factory floors or vehicle under-hood locations. The "TI" suffix explicitly denotes the industrial grade variant.
Does the AT29LV256-15TI require high-voltage programming signals?
No, the AT29LV256-15TI operates exclusively at 3.3 V and does not require any high-voltage programming signals. Programming is enabled solely through a three-byte software command sequence (AAh → 55h → A0h) applied to standard address/data lines. Hardware protection features - including VCC sense below 1.8 V and noise filtering on WE/CE - further eliminate risk of inadvertent writes during power transitions.
How is program completion detected on the AT29LV256-15TI?
The AT29LV256-15TI supports two concurrent, hardware-verified methods: DATA polling on I/O7 (which returns the complement of the last loaded byte until programming completes) and toggle-bit detection on I/O6 (which alternates logic states during active programming). Both mechanisms operate without halting the host processor and are fully specified in the AC characteristics table with tDH = 10 ns hold timing.
What package type is used for the AT29LV256-15TI?
The AT29LV256-15TI uses a 28-lead Thin Small Outline Package (TSOP Type 1), designated as package code "28T" in Atmel's ordering matrix. Its JEDEC MO-153-compliant footprint measures 11.8 mm × 10.0 mm with 0.55 mm lead pitch, optimized for high-density PCB layouts in space-constrained embedded systems. Pin 1 is identified by a beveled corner at the top-left when the package notch faces upward.
Can the AT29LV256-15TI be interfaced with a 5V microcontroller?
Yes - the AT29LV256-15TI accepts 0–5.5 V logic levels on all address and control inputs (A0–A14, CE, OE, WE), enabling direct connection to 5V microcontrollers without level-shifting circuitry. However, I/O0–I/O7 pins are strictly 3.3 V-tolerant (0–3.6 V), so bidirectional data lines must be level-shifted or isolated using open-drain buffers compatible with 3.3 V I/O standards.
AT29LV256-15TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20ms
- Access Time:
- 150 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT29LV256-15TI FAQ
1.How can I place an order for AT29LV256-15TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV256-15TI 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 AT29LV256-15TI reliable?
The price and inventory of AT29LV256-15TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV256-15TI is usually 5 days.
3.What payment methods are accepted for AT29LV256-15TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV256-15TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV256-15TI?
AT29LV256-15TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV256-15TI 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 AT29LV256-15TI?
For technical support, including AT29LV256-15TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV256-15TI requirements.
6.How does Aetrix verify that AT29LV256-15TI is sourced from the original manufacturer or authorized distributors?
All AT29LV256-15TI 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 AT29LV256-15TI meets industry standards.
7.What is the process for return or replacement of AT29LV256-15TI?
All AT29LV256-15TI units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV256-15TI, 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 AT29LV256-15TI part is unused and in its original packaging.
Return procedure for AT29LV256-15TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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