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Microchip Technology AT29LV256-20JI
- Part No.:
- AT29LV256-20JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV256-20JI.pdf
- Description:
- IC FLASH 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,076
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Product details
Overview
AT29LV256-20JI from Atmel is a 3.3V-only, 256 Kbit (32K × 8) in-system Flash memory with 200 ns maximum read access time, 15 mA active current, 50 µA industrial-grade standby current, and sector-based reprogrammability across 512 × 64-byte sectors. It operates over –40°C to +85°C and supports software-controlled sector erase/program without high-voltage programming.
For engineers reviewing the AT29LV256-20JI datasheet, AT29LV256-20JI pinout, AT29LV256-20JI application, or AT29LV256-20JI equivalent, key selection criteria include its 3V-only operation, DATA polling and toggle-bit program status detection, hardware write protection (VCC sense, noise filtering), PLCC-32 packaging, and compatibility with microprocessor bus interfaces requiring CMOS/TTL-level I/O.
Technical Context
The AT29LV256-20JI implements sector-based Flash architecture with internal address/data latches for 64-byte loads, automatic erase-before-program, and embedded control timers. Its software data protection requires a three-byte command sequence (AAh/55h/A0h at specific addresses) to enable programming - preventing accidental writes during power transitions or noise events.
Hardware protection includes VCC sense (<1.8V inhibit), 10 ms power-on delay, CE/OE/WE state-based program inhibition, and 15 ns noise filtering on WE/CE inputs. Input levels tolerate 0–5.5V 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 firmware storage in resource-constrained embedded controllers |
| Read Access Time | 200 ns max - meets timing requirements for 5 MHz bus operation with margin |
| VCC Supply Range | 3.3 V ± 0.3 V - compatible with standard 3.3V logic rails; no separate VPP required |
| Active Current | 15 mA at 5 MHz - enables low-power operation in battery-backed or portable systems |
| Standby Current | 50 µA at –40°C to +85°C - supports long-term retention in always-on industrial monitoring nodes |
| 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 boot code storage |
Pinout & Package
AT29LV256-20JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), JEDEC MS-016AE compliant, with 1.44 mm body height and 0.53 mm lead pitch. Pin 1 is marked by a corner notch and index area.
| 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; supports true read/write data transfer and DATA polling (I/O7) or toggle-bit detection (I/O6) |
| CE | Chip Enable | Active-low chip select; must be low for read or program; high disables outputs and enters standby mode |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention; must be high during program cycles |
| WE | Write Enable | Active-low write strobe; controls byte loading during sector programming; falling edge latches address/data |
| NC | No Connect | Unbonded pin; must remain unconnected per design - not usable as spare I/O |
| DC | Don't Connect | Internally unused; electrically isolated - must not be tied to any voltage or signal |
| VCC | Power Supply | 3.3V ± 0.3V main supply; powers core logic and I/O buffers; monitored for hardware write inhibit |
| GND | Ground Reference | Primary return path for VCC and all I/O; requires low-impedance connection to minimize noise during programming |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) required before each sector program - prevents inadvertent writes during reset or EMI events |
| DATA Polling & Toggle Bit | I/O7 complements last loaded byte until program completes; I/O6 toggles during operation - enables real-time status monitoring without dedicated status registers |
| Single-Cycle Sector Erase/Program | Entire 64-byte sector erased and programmed in ≤20 ms - eliminates need for external erase commands or multi-step protocols |
| Hardware Write Inhibit | VCC sense, 10 ms power-on delay, and 15 ns input noise filtering ensure robustness against brown-out or transient-induced corruption |
| Wide Input Voltage Tolerance | Address and control inputs accept 0–5.5V signals - simplifies interface to 5V microcontrollers without level shifters |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing updatable firmware for programmable logic controllers operating in harsh factory environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability via RS-485 or CAN bus; provides deterministic 200 ns read latency for real-time scan cycle execution. Use Value: Enables remote firmware patches without hardware replacement; 10,000-cycle endurance supports multi-year field upgrades; industrial temp rating ensures reliability at –40°C to +85°C. |
Use Scenario: Holding certified bootloader and calibration data in Class II medical instruments requiring traceable, tamper-resistant memory with audit-ready update logs. IC Role / Device Role / Timing Role: Secure boot memory accessed during power-on self-test; software protection prevents unauthorized modification of safety-critical startup routines. Use Value: Dual protection (software unlock + VCC sensing) meets IEC 62304 SW safety requirements; 50 µA standby current extends battery life in portable diagnostics units. |
| Automotive Body Control Module | Telecom Remote Node Configuration |
Use Scenario: Storing vehicle-specific configuration tables (e.g., door lock logic, lighting profiles) in BCMs subject to automotive qualification and vibration stress. IC Role / Device Role / Timing Role: EEPROM-replacement Flash memory interfaced to 8-bit MCU via parallel bus; supports over-the-air (OTA) parameter updates via diagnostic CAN. Use Value: PLCC-32 package offers superior mechanical reliability vs. TSOP under thermal cycling; sector granularity allows updating only affected parameters without disrupting active functions. |
Use Scenario: Retaining service provisioning data and protocol stack configurations in DSLAM line cards deployed in telecom central offices with strict uptime requirements. IC Role / Device Role / Timing Role: Field-upgradable configuration store accessed during cold start and dynamic reconfiguration; DATA polling enables precise timing of firmware activation after download. Use Value: 200 ns read speed ensures sub-microsecond response to management queries; 3.3V-only operation aligns with modern telecom power architectures and reduces BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF256A-20-4C-NHE | Same density (256 Kbit), 200 ns access, but uses 3.0–3.6V range and has 12 µA typical standby current; lacks hardware VCC-sense inhibit | Lower standby current suits ultra-low-power sleep modes; missing VCC-sense may require external supervisor IC in brown-out-prone systems | Select when minimizing quiescent power is critical and system already includes voltage monitoring |
| MX29LV256ETTI-20G | Identical pinout (PLCC-32), same 200 ns timing, but rated for extended temp (–40°C to +105°C); supports CFI query mode for auto-detection | Higher max temperature supports under-hood automotive use; CFI support simplifies driver development in Linux BSPs | Select for extended-temperature deployments or when standardized flash interface abstraction is required |
Compared with SST39VF256A-20-4C-NHE and MX29LV256ETTI-20G, the AT29LV256-20JI offers unique hardware-level VCC-sense write protection and proven industrial reliability in legacy designs, making it preferred where deterministic fail-safe behavior under marginal supply conditions is mandatory.
Availability
AT29LV256-20JI is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, automotive body electronics, and telecom infrastructure requiring stable component supply across extended lifecycle commitments.
Supply support for AT29LV256-20JI 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 systems.
The AT29LV256 product line was designed for cost-sensitive, in-system programmable nonvolatile memory applications in industrial and automotive control systems where reliability, low-voltage operation, and sector-level update flexibility are essential.
FAQ
What is the guaranteed read access time for AT29LV256-20JI?
The AT29LV256-20JI guarantees a maximum read access time of 200 ns across its full industrial temperature range (–40°C to +85°C) and supply voltage (3.0V to 3.6V). This specification is validated under worst-case AC conditions including tACC and tCE timing parameters, ensuring reliable integration into 5 MHz microprocessor buses without wait-state insertion.
Does AT29LV256-20JI require high-voltage programming?
No, the AT29LV256-20JI does not require high-voltage programming. It operates exclusively from a single 3.3V supply, with all programming controlled by software commands (AAh/55h/A0h sequence) and internal timing. Hardware protections - including VCC sensing below 1.8V and 10 ms power-on delay - prevent unintended writes even during unstable supply conditions.
How many program/erase cycles can AT29LV256-20JI endure per sector?
The AT29LV256-20JI is specified for greater than 10,000 program/erase cycles per sector. This endurance applies independently to each of its 512 sectors, enabling repeated field updates of firmware modules or configuration data without wear leveling - critical for long-lifecycle industrial equipment and medical devices.
What package type is used for AT29LV256-20JI?
The AT29LV256-20JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), JEDEC MS-016AE compliant. This surface-mount package features gull-wing leads, a ceramic-like thermal profile, and mechanical robustness suited for high-reliability applications including automotive and industrial control boards.
Can AT29LV256-20JI interface directly with a 5V microcontroller?
Yes - the AT29LV256-20JI accepts 0–5.5V logic levels on address and control inputs (A0–A14, CE, OE, WE), allowing direct connection to 5V microcontrollers without level-shifting circuitry. However, I/O0–I/O7 pins are limited to 0–3.6V and must interface only with 3.3V-compatible data buses or use bidirectional level translators if driven by 5V outputs.
AT29LV256-20JI 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:
- 200 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)
AT29LV256-20JI FAQ
1.How can I place an order for AT29LV256-20JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV256-20JI 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 AT29LV256-20JI reliable?
The price and inventory of AT29LV256-20JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV256-20JI is usually 5 days.
3.What payment methods are accepted for AT29LV256-20JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV256-20JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV256-20JI?
AT29LV256-20JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV256-20JI 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 AT29LV256-20JI?
For technical support, including AT29LV256-20JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV256-20JI requirements.
6.How does Aetrix verify that AT29LV256-20JI is sourced from the original manufacturer or authorized distributors?
All AT29LV256-20JI 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 AT29LV256-20JI meets industry standards.
7.What is the process for return or replacement of AT29LV256-20JI?
All AT29LV256-20JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV256-20JI, 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 AT29LV256-20JI part is unused and in its original packaging.
Return procedure for AT29LV256-20JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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