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Microchip Technology AT29LV256-15JC-T
- Part No.:
- AT29LV256-15JC-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV256-15JC-T.pdf
- Description:
- IC FLASH 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,301
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Product details
Overview
AT29LV256-15JC-T from Atmel is a 3.3V-only, 256 Kbit (32K × 8) Flash memory IC with 150 ns read access time, 512 sectors of 64 bytes each, and software-controlled sector erase/program functionality. It operates across commercial temperature range (0°C to 70°C), supports CMOS/TTL-compatible I/O, and delivers 15 mA active current and 40 µA standby current - ideal for embedded firmware storage in space-constrained industrial controllers.
For engineers reviewing the AT29LV256-15JC-T datasheet, AT29LV256-15JC-T pinout, AT29LV256-15JC-T application, or AT29LV256-15JC-T equivalent, key selection criteria include sector-based reprogrammability, 3V-only operation without high-voltage programming, DATA polling and toggle-bit program status detection, and PLCC-32 packaging for socketed in-system updates.
Technical Context
The AT29LV256-15JC-T implements a sector-erase architecture where each of its 512 sectors (64 bytes) is independently programmable via a three-byte software unlock sequence (AAh→55h→A0h). Programming requires no external high voltage - all operations occur at VCC = 3.3V ±0.3V, with internal timers managing erase-before-write cycles.
It uses standard parallel interface control logic: CE and OE low + WE high enables read mode; WE low + CE low + OE high initiates byte load; DATA polling on I/O7 or toggle-bit behavior on I/O6 signals program completion. 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 bits) - sufficient for boot code, configuration tables, or small firmware images in microcontroller-based systems. |
| Read Access Time | 150 ns max - enables direct execution from flash (XIP) in 5 MHz bus systems without wait states. |
| Supply Voltage | 3.3V ±0.3V - eliminates need for dedicated 5V or 12V programming supplies; compatible with modern low-voltage logic rails. |
| Endurance | >10,000 program/erase cycles per sector - supports field firmware updates over product lifetime in industrial equipment. |
| Standby Current | 40 µA (CMOS, commercial temp) - critical for battery-backed or energy-sensitive applications requiring ultra-low quiescent power. |
| Sector Size | 64 bytes - allows fine-grained updates without erasing full device; reduces risk of corruption during partial reprogramming. |
| Operating Temp | 0°C to 70°C - validated for commercial-grade embedded systems including point-of-sale terminals and instrumentation front-ends. |
Pinout & Package
AT29LV256-15JC-T is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), pin-compatible with JEDEC MS-016AE standard. The package features gull-wing leads, surface-mount compatibility, and a body size of 13.9 mm × 13.9 mm × 3.56 mm (max height), suitable for reflow soldering and socketed prototyping.
| 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; I/O7 used for DATA polling, I/O6 for toggle-bit status indication during program/erase. |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high-Z output when asserted high - prevents bus contention in multi-device systems. |
| OE | Output Enable | Active-low output control; decouples data bus during reads when CE is low but OE is high - enables shared-bus timing flexibility. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge; used with CE for byte-load initiation and software command sequencing. |
| VCC | Power Supply | +3.3V supply input; includes internal VCC sense circuitry that inhibits programming if voltage drops below ~1.8V. |
| GND | Ground Reference | Signal and power ground; pin 16 in PLCC-32 layout - designated as primary reference for all I/O and internal logic. |
| NC / DC | No Connect / Don't Connect | Pins 4, 13, 29 (PLCC top view) are unconnected; must remain floating - no pull-up/down or routing required. |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h→2AAAh→5555h) prevents accidental writes - essential for robust field firmware updates without hardware write-protect jumpers. |
| Sector Program Architecture | 512 independent 64-byte sectors enable localized reprogramming - avoids full-chip erase delays and preserves valid data in adjacent sectors. |
| DATA Polling & Toggle Bit | Dual asynchronous status mechanisms (I/O7 complement, I/O6 toggling) eliminate need for fixed delay timers - improves system responsiveness and simplifies host controller firmware. |
| 3.3V-Only Operation | Eliminates external charge pumps or high-voltage generators - reduces BOM count, PCB area, and EMI concerns in compact embedded designs. |
| Wide Input Voltage Tolerance | Address/control pins accept 0–5.5V inputs - allows direct interfacing with legacy 5V microcontrollers without level-shifting circuitry. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing firmware update images and calibration parameters in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; provides 150 ns read latency for deterministic scan-cycle execution. Use Value: Enables remote firmware patches without hardware replacement; 10,000-cycle endurance supports >5 years of scheduled updates under typical maintenance intervals. |
Use Scenario: Holding device-specific calibration coefficients and safety-critical boot code in portable diagnostic instruments operating on battery power. IC Role / Device Role / Timing Role: Low-power persistent memory; 40 µA standby current extends battery life between calibrations; sector granularity isolates updates from operational data. Use Value: Eliminates need for external EEPROM or battery-backed SRAM; 3.3V-only operation simplifies power architecture and reduces component count. |
| Point-of-Sale Terminal Boot ROM | Network Router Configuration Store |
Use Scenario: Hosting secure bootloader and encrypted application images in retail payment terminals subject to PCI compliance requirements. IC Role / Device Role / Timing Role: Read-only execution memory with software write protection; 150 ns access ensures fast cold-boot times (<500 ms). Use Value: Prevents unauthorized firmware modification via the three-byte unlock sequence - satisfies tamper-resistance requirements for financial hardware. |
Use Scenario: Storing routing table defaults, MAC address pools, and failover configurations in enterprise-grade SOHO routers. IC Role / Device Role / Timing Role: Field-upgradable configuration store; PLCC-32 package allows socketed replacement during service; sector erase minimizes downtime during config reloads. Use Value: Reduces service call frequency by enabling remote config recovery; 64-byte sector size aligns with typical DHCP or DNS record storage blocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV256EITI-15G | Same density (256 Mbit), 150 ns access, but uses 32-pin TSOP-I package and supports CFI query mode - lacks hardware product ID pins. | Designed for high-volume SMT production; no PLCC socket support; requires CFI-aware bootloader initialization. | Select when migrating to surface-mount-only assembly and firmware already supports Common Flash Interface protocols. |
| EN29LV256A-15BPI | Pin-compatible PLCC-32, identical 150 ns timing and 3.3V operation, but offers extended temperature range (-40°C to +85°C) and 100,000-cycle endurance. | Validated for industrial edge gateways exposed to thermal cycling; higher endurance suits frequent OTA update scenarios. | Choose for new designs requiring broader temp range or longer field life - drop-in replacement with no layout change. |
Compared with MX29LV256EITI-15G and EN29LV256A-15BPI, the AT29LV256-15JC-T provides verified PLCC-32 socket compatibility and Atmel's mature software unlock protocol, making it optimal for legacy system maintenance and low-volume field-service upgrades where firmware toolchain stability is prioritized over raw endurance or CFI feature set.
Availability
AT29LV256-15JC-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and point-of-sale terminal boot ROM requiring stable component supply, long-lifecycle support, and socketed field-replaceability.
Supply support for AT29LV256-15JC-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, nonvolatile memory, and secure authentication ICs for embedded systems.
The AT29LV256 product line was designed for in-system programmable Flash memory applications in cost-sensitive, space-constrained embedded systems requiring reliable firmware storage without high-voltage programming infrastructure.
FAQ
What is the maximum operating temperature range for the AT29LV256-15JC-T?
The AT29LV256-15JC-T is rated for commercial temperature operation from 0°C to 70°C. Its ordering code suffix "C" explicitly denotes this range, and the PLCC-32 package is characterized and tested across this interval for all AC/DC parameters including 150 ns read access and 40 µA standby current.
Does the AT29LV256-15JC-T require external high-voltage programming signals?
No, the AT29LV256-15JC-T performs all programming and erase operations using only its 3.3V supply rail - no external 12V or 5V programming voltage is needed. Internal circuitry generates necessary voltages, and software commands (AAh→55h→A0h) initiate sector programming, making AT29LV256-15JC-T suitable for simple in-system updates.
How many program/erase cycles can the AT29LV256-15JC-T endure per sector?
The AT29LV256-15JC-T guarantees typical endurance of more than 10,000 program/erase cycles per sector. This specification is measured under standard conditions (VCC = 3.3V, TA = 25°C) and applies individually to each of its 512 sectors - enabling repeated field firmware updates without premature wear-out.
What package type does the AT29LV256-15JC-T use, and is it socket-compatible?
The AT29LV256-15JC-T uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) per JEDEC MS-016AE. Its pinout and mechanical dimensions are fully socket-compatible with standard 32-pin PLCC sockets, supporting easy prototyping, in-circuit debugging, and field-level component replacement without PCB rework.
Can the AT29LV256-15JC-T interface directly with a 5V microcontroller?
Yes - the AT29LV256-15JC-T accepts 0–5.5V logic levels on address and control inputs (A0–A14, CE, OE, WE), allowing direct connection to 5V microcontrollers without level shifters. However, I/O0–I/O7 pins are limited to 0–3.6V and must interface only with 3.3V-tolerant or level-shifted data buses to prevent damage.
AT29LV256-15JC-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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29LV256-15JC-T FAQ
1.How can I place an order for AT29LV256-15JC-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV256-15JC-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 AT29LV256-15JC-T reliable?
The price and inventory of AT29LV256-15JC-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV256-15JC-T is usually 5 days.
3.What payment methods are accepted for AT29LV256-15JC-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV256-15JC-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV256-15JC-T?
AT29LV256-15JC-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV256-15JC-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 AT29LV256-15JC-T?
For technical support, including AT29LV256-15JC-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV256-15JC-T requirements.
6.How does Aetrix verify that AT29LV256-15JC-T is sourced from the original manufacturer or authorized distributors?
All AT29LV256-15JC-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 AT29LV256-15JC-T meets industry standards.
7.What is the process for return or replacement of AT29LV256-15JC-T?
All AT29LV256-15JC-T units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV256-15JC-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 AT29LV256-15JC-T part is unused and in its original packaging.
Return procedure for AT29LV256-15JC-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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