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Microchip Technology AT29LV256-15JI
- Part No.:
- AT29LV256-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV256-15JI.pdf
- Description:
- IC FLASH 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,324
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Product details
Overview
AT29LV256-15JI from Atmel is a 3.3V-only, 256K-bit (32K × 8) in-system Flash memory IC with 150 ns read access time, 512 sectors of 64 bytes each, software-controlled sector erase/program, and industrial temperature range (–40°C to +85°C). It operates without high-voltage programming, supports DATA polling and toggle-bit status detection, and is used in embedded firmware storage for microcontroller-based systems requiring field-upgradable code.
For engineers reviewing the AT29LV256-15JI datasheet, AT29LV256-15JI pinout, AT29LV256-15JI application, or AT29LV256-15JI equivalent, key selection considerations include its 3.3V-only operation, sector-based reprogramming architecture, CMOS standby current of 50 µA, hardware and software data protection, and PLCC-32 packaging for industrial-grade reliability.
Technical Context
The AT29LV256-15JI implements a sector-erase Flash architecture with internal address/data latching for 64-byte loads, automatic erase-before-program sequencing, and dual status detection (I/O7 DATA polling and I/O6 toggle bit). Its control logic responds to CE/OE/WE timing per JEDEC-compliant read and byte-load waveforms.
It features hardware safeguards including VCC sense (<1.8V inhibit), 10 ms power-on delay, noise filtering (<15 ns pulse rejection), and three-level software data protection using the 5555h/2AAAh/A0h command sequence. Input levels tolerate 0–5.5V on address/control pins while I/O pins are limited to 0–3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 × 8), sufficient for boot code or configuration data in 8-bit microcontroller systems |
| Read Access Time | 150 ns max - enables direct execution from Flash in systems with ≤6.7 MHz bus timing |
| Supply Voltage | 3.3 V ± 0.3 V - compatible with modern low-voltage logic families without level-shifting |
| Active Current | 15 mA max at 5 MHz - supports low-power active operation in battery-backed or energy-constrained designs |
| Standby Current | 50 µA max (industrial temp) - enables long-term retention with minimal quiescent draw |
| Sector Size | 64 bytes × 512 sectors - allows fine-grained firmware updates without full-chip erasure |
| Endurance | >10,000 program/erase cycles per sector - suitable for field-upgradable applications with infrequent but critical updates |
Pinout & Package
AT29LV256-15JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), pin-compatible with industry-standard MS-016AE footprint. The package provides robust thermal and mechanical performance for industrial PCB environments.
| 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 | 8-bit parallel interface; I/O7 used for DATA polling status, I/O6 for toggle-bit detection during programming |
| CE | Chip Enable | Active-low chip select; must be stable before address setup; inhibits programming when high |
| OE | Output Enable | Active-low output control; high-Z state prevents bus contention; must be high during programming |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data during byte load; controls programming initiation |
| VCC | Power Supply | +3.3 V supply; includes internal VCC sense circuitry that disables programming if voltage drops below ~1.8 V |
| GND | Ground Reference | Signal and power ground reference; decoupling required within 1 cm of VCC pin for stable operation |
| NC / DC | No Connect / Don't Connect | Unbonded pins (PLCC pins 4, 13, 29); must remain unconnected per datasheet to avoid latch-up or timing faults |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-command sequence (5555h/2AAAh/A0h) required before any sector programming - prevents accidental writes during power transitions or noise events |
| Internal Program Control | On-chip timer and erase/program sequencer eliminate external controller overhead - reduces firmware complexity for in-system updates |
| DATA Polling & Toggle Bit | Dual asynchronous status reporting via I/O7 (complement-to-data) and I/O6 (toggle) - enables non-blocking polling without dedicated status registers |
| CMOS/TTL Compatibility | Inputs accept 0–5.5 V; outputs drive standard TTL loads - simplifies integration into mixed-voltage legacy systems |
| Industrial Temperature Range | –40°C to +85°C operation - qualified for deployment in automotive ECUs, industrial PLCs, and outdoor telemetry hardware |
Applications
| Embedded Firmware Storage | Industrial Controller Configuration |
|---|---|
|
Use Scenario: Storing boot loader and application firmware in a programmable logic controller (PLC) with field-update capability. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; serves as primary instruction memory mapped to microcontroller address space. Use Value: Enables remote firmware patches without hardware replacement; 64-byte sector granularity minimizes update window and risk of corruption. |
Use Scenario: Holding calibration tables and operational parameters in an industrial motor drive unit subject to environmental stress. IC Role / Device Role / Timing Role: Parameter EEPROM replacement; accessed during startup and runtime via standard memory-mapped reads/writes. Use Value: 10,000-cycle endurance and –40°C to +85°C rating ensure reliable parameter retention over 10+ years in harsh factory environments. |
| Medical Device Boot Memory | Telecom Edge Node Code Storage |
|
Use Scenario: Secure boot image storage in a Class II medical infusion pump requiring regulatory-compliant firmware integrity. IC Role / Device Role / Timing Role: Read-only boot ROM during power-on initialization; write-enabled only during authenticated update sequences. Use Value: Hardware VCC-sense and software lock prevent unauthorized or partial writes - supports IEC 62304 traceability requirements. |
Use Scenario: Storing protocol stack binaries and configuration profiles in a cellular base station remote radio unit (RRU). IC Role / Device Role / Timing Role: Field-upgradable firmware repository accessed over SPI-to-parallel bridge; supports hot-swappable module replacement. Use Value: 150 ns access time meets real-time packet processing latency budgets; PLCC-32 package withstands thermal cycling in outdoor enclosures. |
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 (256K × 8), 70 ns access, 3.3 V operation, 100,000 write cycles, TSOP-48 package | Higher density and endurance; requires PCB redesign due to 48-pin TSOP vs. 32-pin PLCC | Preferred where larger code space and longer field life are required; not drop-in compatible |
| MX29LV256DTTI-90G | 256 Mbit (32M × 8), 90 ns access, 3.3 V, 100,000 cycles, TSOP-56 package; supports CFI query mode | Massively higher capacity and faster timing; lacks software data protection command set of AT29LV256-15JI | Selected for new designs needing scalability; legacy AT29LV256-15JI users retain compatibility via pinout adaptation only |
Compared with SST39VF200A-70-4C-NHE and MX29LV256DTTI-90G, the AT29LV256-15JI offers proven industrial reliability in PLCC-32, deterministic 150 ns timing, and mature software protection - making it optimal for cost-sensitive, long-lifecycle embedded systems where pinout stability and firmware update safety are prioritized over raw speed or density.
Availability
AT29LV256-15JI is available at Aetrix Electronics and suitable for industrial automation controllers, medical device boot memory, and telecom edge node firmware storage requiring stable component supply across extended product lifecycles.
Supply support for AT29LV256-15JI 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 embedded applications.
The AT29LV256 family was designed specifically for in-system programmable firmware storage in resource-constrained 8-bit and 16-bit microcontroller platforms, emphasizing low-voltage operation, sector-level update flexibility, and industrial-grade reliability.
FAQ
What is the operating temperature range for the AT29LV256-15JI?
The AT29LV256-15JI is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Ordering Information table and DC Operating Range section of the datasheet, and applies to all electrical parameters including read access time, standby current (50 µA max), and programming endurance. The "I" suffix in the part number explicitly denotes industrial grade.
Does the AT29LV256-15JI require high-voltage programming signals?
No, the AT29LV256-15JI operates with 3.3 V only - no high-voltage (e.g., 12 V) programming signal is required. Programming is enabled solely through the three-byte software command sequence (5555h/2AAAh/A0h) followed by byte loads, as defined in the Software Protected Program Waveform and Programming Algorithm sections. Hardware protection ensures programming is inhibited if VCC falls below ~1.8 V.
How many sectors does the AT29LV256-15JI have, and what is the sector size?
The AT29LV256-15JI contains 512 sectors, each 64 bytes in size. This is explicitly stated in the Features list and elaborated in the Device Operation section: "512 Sectors (64 bytes/sector)" and "A6 to A14 specify the sector address." Sector addressing is orthogonal to byte addressing (A0–A5), enabling independent update of any 64-byte block without affecting adjacent sectors.
What package type is used for the AT29LV256-15JI?
The AT29LV256-15JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), designated as package code "32J" in the Ordering Information table. Mechanical dimensions and footprint comply with JEDEC standard MS-016AE, and the package drawing is provided on page 11 of the datasheet. Pins marked NC or DC (e.g., PLCC pins 4, 13, 29) must remain unconnected.
How is end-of-program detection implemented in the AT29LV256-15JI?
The AT29LV256-15JI supports two hardware-confirmed methods: DATA polling on I/O7 (complement of loaded data until completion) and toggle-bit detection on I/O6 (repeated toggling between 0 and 1 during programming). Both are detailed in dedicated waveform and characteristics sections (pages 8–9), and can be initiated at any time during the cycle - no additional control signals or status registers are needed.
AT29LV256-15JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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:
- 32-PLCC (13.97x11.43)
AT29LV256-15JI FAQ
1.How can I place an order for AT29LV256-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV256-15JI 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 AT29LV256-15JI reliable?
The price and inventory of AT29LV256-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV256-15JI is usually 5 days.
3.What payment methods are accepted for AT29LV256-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV256-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV256-15JI?
AT29LV256-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV256-15JI 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 AT29LV256-15JI?
For technical support, including AT29LV256-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV256-15JI requirements.
6.How does Aetrix verify that AT29LV256-15JI is sourced from the original manufacturer or authorized distributors?
All AT29LV256-15JI 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 AT29LV256-15JI meets industry standards.
7.What is the process for return or replacement of AT29LV256-15JI?
All AT29LV256-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV256-15JI, 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 AT29LV256-15JI part is unused and in its original packaging.
Return procedure for AT29LV256-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29LV256-15JI Tags
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