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Microchip Technology AT29LV256-15JI-T
- Part No.:
- AT29LV256-15JI-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV256-15JI-T.pdf
- Description:
- IC FLASH 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,956
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Product details
Overview
AT29LV256-15JI-T from Atmel is a 3.3V-only, 256 Kbit (32K × 8) Flash memory IC designed for in-system reprogrammability in embedded microcontroller systems. It features 150 ns read access time, sector-based programming (512 sectors × 64 bytes), software data protection, and operates across -40°C to +85°C industrial temperature range.
For engineers reviewing the AT29LV256-15JI-T datasheet, AT29LV256-15JI-T pinout, AT29LV256-15JI-T application, or AT29LV256-15JI-T equivalent, key selection criteria include 3V-only operation, sector erase/program architecture, DATA polling and toggle-bit status detection, CMOS/TTL-compatible I/O, and PLCC-32 packaging for legacy board compatibility.
Technical Context
The AT29LV256-15JI-T implements a sector-erase Flash architecture with internal latching of 64-byte sectors during program cycles, enabling bus release for concurrent operations. Its software-controlled programming requires a three-byte unlock sequence (AAh→55h→A0h) before each sector load, and automatic internal erase precedes programming without separate erase command.
It supports dual status detection: DATA polling on I/O7 (complement-to-data during programming) and toggle-bit behavior on I/O6. Hardware protections include VCC sense (<1.8V inhibit), 10 ms power-on delay, noise filtering (<15 ns pulse rejection), and control-line gating (OE high/CE high/WE high inhibits write).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32,768 words × 8 bits); sufficient for firmware storage in 8-bit microcontrollers and boot code in legacy industrial controllers. |
| Read Access Time | 150 ns max; enables direct execution from flash (XIP) in systems with ≤6.7 MHz bus timing budgets. |
| Supply Voltage | 3.0 V to 3.6 V only; eliminates need for 5V/12V programming voltages and simplifies power design in 3.3V systems. |
| Active Current | 15 mA typical at 5 MHz; allows low-power operation in battery-backed or energy-constrained embedded applications. |
| Standby Current | 40 µA CMOS standby (industrial temp); supports ultra-low-power sleep modes in always-on monitoring devices. |
| Endurance | 10,000 program/erase cycles per sector; suitable for field-upgradable firmware with infrequent updates over 10+ year product life. |
| Operating Temperature | -40°C to +85°C; qualified for industrial automation, motor drives, and outdoor metering equipment. |
Pinout & Package
AT29LV256-15JI-T is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), compliant with JEDEC MS-016 AE. The package features gull-wing leads, 1.27 mm pitch, and a 13.9 mm × 13.9 mm body size with index mark for orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus; A0–A5 select byte within 64-byte sector, A6–A14 select sector (0–511). |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; supports true read/write with tristate outputs controlled by CE/OE. |
| CE | Chip Enable | Active-low chip select; must be low for read or write; high-Z output when high (prevents bus contention). |
| OE | Output Enable | Active-low output gate; controls data assertion on I/O lines independently of CE for multiplexed bus sharing. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge; used with CE for byte-load sequencing. |
| VCC | Power Supply | +3.3 V ±0.3 V supply; powers core logic and I/O buffers; supports 0–5.5 V input tolerance on control pins. |
| GND | Ground | Reference for all signals and power; dedicated pin ensures stable reference under switching noise. |
| NC / DC | No Connect / Don't Connect | Unbonded or unused pins; must remain unconnected per datasheet to avoid latch-up or timing violation. |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) required before every sector program; prevents accidental writes during power transients or noise events. |
| Sector Program Architecture | 512 independent 64-byte sectors; enables granular firmware updates without full-chip erase-reducing update time and wear on unaffected sectors. |
| Status Detection Methods | Dual-mode: DATA polling on I/O7 (complement read) and toggle-bit on I/O6; provides flexible, hardware-agnostic polling for any host controller. |
| Hardware Write Inhibit | VCC sense, 10 ms power-on delay, and noise filtering (<15 ns) ensure robustness against brown-out, ESD, and EMI-induced spurious writes. |
| Input Voltage Tolerance | Control inputs (CE/OE/WE/A0–A14) tolerate 0–5.5 V while powered from 3.3 V; enables direct interfacing with 5V microcontrollers without level shifters. |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot Code |
|---|---|
|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory-floor environments with wide ambient temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into microcontroller address space; accessed via standard parallel bus with 150 ns timing compliance. Use Value: Industrial temperature rating (-40°C to +85°C) and 10,000-cycle endurance ensure reliable field updates over 15-year equipment lifetimes without recalibration or replacement. |
Use Scenario: Holding boot loader and safety-critical initialization routines in Class II medical instruments requiring long-term data retention and regulatory traceability. IC Role / Device Role / Timing Role: Secure, software-protected boot memory; uses DATA polling to confirm write completion before system handoff-critical for deterministic startup. Use Value: Software data protection prevents unauthorized or corrupted firmware loads, satisfying IEC 62304 software lifecycle requirements for medical device software validation. |
| Automotive Body Control Module | Point-of-Sale Terminal Configuration |
|
Use Scenario: Storing calibration tables and feature-enable bits in automotive BCMs operating under engine-bay thermal stress and load-dump voltage transients. IC Role / Device Role / Timing Role: In-system reprogrammable Flash memory; leverages hardware VCC sense and noise filtering to reject false writes during ignition cycling. Use Value: 3.3V-only operation eliminates need for external charge pumps; 40 µA standby current minimizes parasitic drain on vehicle battery during extended parking. |
Use Scenario: Retaining localized language packs, tax rate tables, and peripheral driver configurations in retail POS terminals subject to frequent regional redeployment. IC Role / Device Role / Timing Role: Field-upgradable configuration store; sector-based erase allows selective update of tax tables without disturbing payment stack firmware. Use Value: 64-byte sector granularity reduces update window and risk of corruption-enabling safe over-the-air (OTA) configuration patches via serial bootloader. |
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, 3.0–3.6 V; lacks hardware VCC sense and noise filtering; uses different unlock sequence (5555h/2AAAh/5555h → 5555h/2AAAh/10h). | Higher density and faster access, but lower write robustness; requires tighter layout control for noise immunity. | Choose for new designs needing higher capacity and speed where legacy PLCC-32 footprint isn't required. |
| MX29LV256DTTC-90G | 256 Kbit, 90 ns access, 2.7–3.6 V; supports both sector and chip erase; includes CFI query mode; no toggle-bit support-relies on RY/BY# pin. | Requires RY/BY# signal routing and CFI-aware bootloader; not pin-compatible due to different pinout (TSOP-48 vs PLCC-32). | Prefer for systems already using Macronix toolchains and requiring CFI-compliant auto-configuration. |
Compared with SST39VF200A-70-4C-NHE and MX29LV256DTTC-90G, the AT29LV256-15JI-T offers proven industrial reliability with hardware-level write safeguards and PLCC-32 compatibility for drop-in replacement in legacy boards-making it optimal for maintenance and EOL mitigation rather than greenfield designs.
Availability
AT29LV256-15JI-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot code, and automotive body control module applications requiring stable component supply and long-term obsolescence management.
Supply support for AT29LV256-15JI-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 fabless semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT29LV256 product line was designed specifically for 3.3V in-system reprogrammable firmware storage in resource-constrained 8-bit and 16-bit embedded systems-emphasizing robustness, sector granularity, and backward compatibility with EPROM interfaces.
FAQ
What is the correct power supply range for AT29LV256-15JI-T?
The AT29LV256-15JI-T requires a single 3.0 V to 3.6 V supply (VCC = 3.3 V ±0.3 V). Operation outside this range-especially below 2.7 V-will disable programming functions due to built-in VCC sense circuitry. The device draws 15 mA active current and 40 µA standby current within this range, making it suitable for low-power industrial applications.
How does software data protection work on AT29LV256-15JI-T?
AT29LV256-15JI-T requires a precise three-byte unlock sequence (write AAh to address 5555h, then 55h to 2AAAh, then A0h to 5555h) before any sector programming. This sequence must be repeated before each 64-byte sector load. Without it, WE/CE pulses initiate internal timers but do not alter memory contents-ensuring immunity to noise or glitch-induced writes.
Can AT29LV256-15JI-T be used with a 5V microcontroller?
Yes-AT29LV256-15JI-T accepts 0–5.5 V logic levels on address and control inputs (A0–A14, CE, OE, WE) while operating from a 3.3 V supply. This allows direct connection to 5V microcontrollers without level shifters. However, I/O0–I/O7 pins are limited to 0–3.6 V and must not exceed VCC + 0.6 V, so bidirectional data lines require voltage translation if the MCU drives them above 3.6 V.
What is the sector organization of AT29LV256-15JI-T?
The AT29LV256-15JI-T contains 512 independent sectors, each 64 bytes wide (total 32,768 bytes). Sector addresses are selected using A6–A14; byte addresses within a sector use A0–A5. Programming requires loading all 64 bytes of a sector-unloaded bytes default to FFh-and triggers automatic sector erase before programming, eliminating need for explicit erase commands.
How is end-of-program detection implemented in AT29LV256-15JI-T?
AT29LV256-15JI-T supports two hardware-confirmed methods: DATA polling on I/O7 (returns complement of last loaded byte until complete, then true data) and toggle-bit detection on I/O6 (toggles between 0/1 during programming, stops when complete). Both methods allow host software to poll without external timing dependencies-critical for deterministic firmware update sequences in safety-critical systems.
AT29LV256-15JI-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 32-PLCC (13.97x11.43)
AT29LV256-15JI-T FAQ
1.How can I place an order for AT29LV256-15JI-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV256-15JI-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 AT29LV256-15JI-T reliable?
The price and inventory of AT29LV256-15JI-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV256-15JI-T is usually 5 days.
3.What payment methods are accepted for AT29LV256-15JI-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV256-15JI-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV256-15JI-T?
AT29LV256-15JI-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV256-15JI-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 AT29LV256-15JI-T?
For technical support, including AT29LV256-15JI-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV256-15JI-T requirements.
6.How does Aetrix verify that AT29LV256-15JI-T is sourced from the original manufacturer or authorized distributors?
All AT29LV256-15JI-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 AT29LV256-15JI-T meets industry standards.
7.What is the process for return or replacement of AT29LV256-15JI-T?
All AT29LV256-15JI-T units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV256-15JI-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 AT29LV256-15JI-T part is unused and in its original packaging.
Return procedure for AT29LV256-15JI-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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