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Microchip Technology AT29LV256-15TI-T
- Part No.:
- AT29LV256-15TI-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT29LV256-15TI-T.pdf
- Description:
- IC FLASH 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,881
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Product details
Overview
AT29LV256-15TI-T from Atmel is a 3.3V-only, 256K-bit (32K × 8) Flash memory IC designed for in-system reprogrammability in embedded controllers and firmware storage applications. It features 150 ns read access time, sector-based programming with 512 × 64-byte sectors, software data protection, and operates across -40°C to +85°C industrial temperature range.
For engineers reviewing the AT29LV256-15TI-T datasheet, AT29LV256-15TI-T pinout, AT29LV256-15TI-T application, or AT29LV256-15TI-T equivalent, this page delivers verified electrical parameters, PLCC-32 and TSOP-28 package mapping, sector erase/program timing, DATA polling and toggle bit detection methods, and real-world use cases in firmware update and configuration storage systems.
Technical Context
The AT29LV256-15TI-T implements a sector-erase architecture with internal address/data latching for 64-byte loads, enabling microprocessor-speed data capture before autonomous erase-and-program execution. Its software data protection requires a three-byte command sequence (AAh/55h/A0h) to enable programming, preventing accidental writes during power transitions or noise events.
Hardware protection includes VCC sense (<1.8V inhibition), 10 ms power-on delay, and noise filtering on WE/CE inputs (rejects <15 ns pulses). Read operation mirrors EPROM behavior: CE and OE low with WE high asserts data; outputs enter high-Z when CE or OE is high-supporting bus contention avoidance in shared-memory systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8 bits) - supports full firmware images for 8-bit microcontrollers |
| Read Access Time | 150 ns max - enables direct execution from flash in systems with ≤6.7 MHz bus timing |
| Supply Voltage | 3.0 V to 3.6 V - compatible with 3.3V logic rails without level translation |
| Active Current | 15 mA max at 5 MHz - limits thermal load in compact industrial modules |
| Standby Current | 40 µA CMOS (industrial temp) - extends battery life in always-on configuration storage |
| Sector Size | 64 bytes × 512 sectors - allows fine-grained firmware patching without full chip erase |
| Endurance | 10,000 program/erase cycles per sector - supports field-upgradable devices over 5+ years |
| Operating Temp | -40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor IoT nodes |
Pinout & Package
AT29LV256-15TI-T is available in 28-lead Thin Small Outline Package (TSOP) and 32-lead Plastic J-Leaded Chip Carrier (PLCC). The TI suffix denotes industrial temperature grade (-40°C to +85°C) and TSOP-28 packaging; the -T suffix confirms tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; A6–A14 select sector, A0–A5 select byte within sector |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path; I/O7 used for DATA polling, I/O6 for toggle bit status monitoring |
| CE | Chip Enable | Active-low chip select; must be stable before address setup; inhibits programming if high during write cycle |
| OE | Output Enable | Active-low output control; high-Z state prevents bus contention when disabled; required high during byte load |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data; toggling initiates byte load or polling mode |
| VCC | Power Supply | 3.3V ±0.3V supply; internal VCC sense disables programming below 1.8V |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal logic |
| NC / DC | No Connect / Don't Connect | Unbonded pins (PLCC pins 4, 13, 29–32); must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) required before each sector program - eliminates need for external hardware write protect |
| Internal Sector Erase | Automatic erase prior to programming - removes requirement for separate erase command or external timing control |
| DATA Polling & Toggle Bit | I/O7 complement read and I/O6 toggling provide real-time, bus-compatible program completion detection - no external polling timer needed |
| Single-Cycle Reprogram | 64-byte sector load and simultaneous internal programming - reduces host CPU overhead vs. byte-by-byte EEPROM writes |
| 3.3V-Only Operation | No 12V or 5V programming voltage required - simplifies power design and eliminates charge pump circuitry |
| Industrial Temperature Range | Validated operation from -40°C to +85°C - suitable for deployment in motor drives, PLCs, and outdoor gateways |
Applications
| Firmware Storage | Configuration Memory |
|---|---|
Use Scenario: Storing boot code and application firmware for 8-bit microcontrollers in industrial HMIs. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into MCU address space; accessed via standard read cycles with 150 ns latency. Use Value: Enables field firmware updates without removing the device; sector granularity allows patching without erasing calibration data stored in adjacent sectors. |
Use Scenario: Retaining user settings, calibration coefficients, and network credentials in smart meters. IC Role / Device Role / Timing Role: Configuration storage accessed infrequently but requiring guaranteed retention over 10+ years and >10,000 write cycles. Use Value: 40 µA standby current minimizes battery drain in battery-backed meters; software protection prevents corruption during brown-out events. |
| Embedded BIOS | Legacy System Upgrade |
Use Scenario: Replacing obsolete EPROMs in legacy PC motherboards or industrial controllers requiring BIOS updates. IC Role / Device Role / Timing Role: Drop-in replacement for 27C256 EPROMs using identical 28-pin DIP footprint and read protocol. Use Value: Eliminates UV eraser dependency and socket programming; 3.3V compatibility avoids level-shifter redesign in existing 5V systems with mixed-voltage I/O. |
Use Scenario: Retrofitting aging instrumentation with field-upgradable firmware while retaining original PCB layout. IC Role / Device Role / Timing Role: Pin-compatible TSOP-28 replacement for discontinued 29F256 or 28F256 devices in same socket. Use Value: Same 28-pin footprint and identical control signal timing (tACC = 150 ns) enables zero-layout-change upgrade path with no firmware modification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF256A-70-4C-NHE | 70 ns read access, 3.0–3.6V supply, 512 × 64-byte sectors, same TSOP-28 package | Higher speed enables tighter timing margins in fast-bus systems; lacks hardware VCC sense protection | Select when system requires sub-100 ns read performance and can manage external write protection logic |
| MX29LV256EITI-70G | 70 ns read access, 2.7–3.6V supply, 512 × 64-byte sectors, TSOP-28, supports CFI query mode | Broad voltage range improves robustness in fluctuating 3.3V rails; CFI support simplifies auto-detection in bootloader code | Prefer for new designs needing wider supply tolerance and standardized JEDEC interface discovery |
Compared with AT29LV256-15TI-T, SST39VF256A offers faster read timing but less integrated hardware protection, while MX29LV256E provides broader voltage operation and CFI compliance at the cost of slightly higher standby current (100 µA vs. 40 µA).
Availability
AT29LV256-15TI-T is available at Aetrix Electronics and suitable for industrial control panels, smart metering systems, and legacy embedded BIOS upgrades requiring stable component supply and long-term lifecycle support.
Supply support for AT29LV256-15TI-T 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 innovator known for microcontrollers, Flash memory, and secure authentication ICs.
The AT29LV256 product line was engineered for reliable, in-system programmable nonvolatile storage in resource-constrained embedded systems-prioritizing low-voltage operation, sector-level flexibility, and robust data retention under industrial environmental stress.
FAQ
What is the maximum read access time specified for AT29LV256-15TI-T?
The AT29LV256-15TI-T has a maximum read access time (tACC) of 150 ns, measured from address valid to valid data on I/O lines under commercial and industrial temperature ranges at VCC = 3.0–3.6 V. This value is guaranteed by characterization and applies to both PLCC-32 and TSOP-28 packages of the AT29LV256-15TI-T.
Does AT29LV256-15TI-T require high-voltage programming signals?
No, the AT29LV256-15TI-T operates with 3.3V-only programming-no 12V or 5V auxiliary supplies are needed. Programming is enabled solely through a software unlock sequence (AAh/55h/A0h) applied to standard address/data lines, making it compatible with 3.3V microcontroller buses without level shifters or charge pumps.
How many program/erase cycles is AT29LV256-15TI-T rated for?
The AT29LV256-15TI-T is rated for typical endurance of >10,000 program/erase cycles per sector. This specification is validated across the full industrial temperature range (-40°C to +85°C) and reflects sector-level wear leveling-each of the 512 sectors may be independently cycled up to this limit without affecting others.
What package types are offered for AT29LV256-15TI-T?
The AT29LV256-15TI-T is specifically packaged in a 28-lead Thin Small Outline Package (TSOP), indicated by the "TI" suffix (T = TSOP, I = Industrial grade). While the base AT29LV256 family also includes PLCC-32 and PDIP-28 variants, the -TI-T designation confirms TSOP-28 with industrial temperature qualification and tape-and-reel delivery.
How does AT29LV256-15TI-T indicate completion of a sector program cycle?
The AT29LV256-15TI-T supports two hardware-confirmed methods: DATA polling (reading I/O7 returns complement of last loaded byte until completion, then true data) and Toggle Bit detection (I/O6 toggles between 0 and 1 during programming, then stabilizes). Both methods operate without halting the host processor and are usable at any point during the 20 ms max program cycle.
AT29LV256-15TI-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for AT29LV256-15TI-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV256-15TI-T 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-T reliable?
The price and inventory of AT29LV256-15TI-T 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-T is usually 5 days.
3.What payment methods are accepted for AT29LV256-15TI-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV256-15TI-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV256-15TI-T?
AT29LV256-15TI-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV256-15TI-T 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-T?
For technical support, including AT29LV256-15TI-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV256-15TI-T requirements.
6.How does Aetrix verify that AT29LV256-15TI-T is sourced from the original manufacturer or authorized distributors?
All AT29LV256-15TI-T 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-T meets industry standards.
7.What is the process for return or replacement of AT29LV256-15TI-T?
All AT29LV256-15TI-T units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV256-15TI-T, 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-T part is unused and in its original packaging.
Return procedure for AT29LV256-15TI-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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