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Home > Products > Integrated Circuits (ICs) > Memory > Configuration PROMs for FPGAs

Microchip Technology AT17LV256-10NC

Name: AT17LV256-10NC
Brand: Microchip Technology
SKU: AT17LV256-10NC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT17LV256-10NC

Manufacturer:: Microchip Technology

Category:: Configuration PROMs for FPGAs

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AT17LV256-10NC.pdf

Description:: IC EEPROM FPGA 256KB 8-SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AT17LV256-10NC from Microchip Technology (formerly Atmel) is a 256-Kbit serial EEPROM FPGA configuration memory, supporting both 3.3V and 5.0V operation, with in-system programmability via two-wire bus, programmable reset polarity, and cascading capability for multi-FPGA systems. It targets SRAM-based FPGA bootloading in industrial embedded control and reconfigurable logic applications.

For engineers reviewing the AT17LV256-10NC datasheet, AT17LV256-10NC pinout, AT17LV256-10NC application, or AT17LV256-10NC equivalent, key selection criteria include voltage compatibility (3.3V/5V), industrial temperature range (−40°C to +85°C), 8-lead SOIC package footprint, standby current ≤100 µA, and CEO-enabled daisy-chain support for scalable configuration memory.

Technical Context

The AT17LV256-10NC implements a serial master-mode interface synchronized to an external FPGA-provided CCLK signal, using CE, RESET/OE, and SER_EN to manage address counter enable, reset, and programming mode entry. Its internal EEPROM array stores bitstream data accessed sequentially on DATA line with timing-critical delays (e.g., TCAC ≤ 80 ns at 3.3V).

It supports cascaded configurations via CEO output driving CE of the next device, enabling multi-device chains without external controllers. The device uses a low-power CMOS EEPROM process with 100,000 write cycles and 90-year data retention at 85°C, and features programmable reset polarity and write protection via WP pin.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	256 Kbit (262,144 × 1-bit) - sufficient to configure mid-density Xilinx XC4000 or Altera FLEX devices.
Supply voltage	3.3 V ±10% or 5.0 V ±10% - dual-voltage support enables reuse across legacy 5V and modern 3.3V FPGA platforms.
Operating temperature	−40°C to +85°C - qualified for industrial environments without derating.
Standby current	≤100 µA at 3.3V - enables low-power system sleep modes when CE is high.
Max clock frequency	10 MHz at 3.3V (industrial) - sets upper bound on FPGA configuration speed; compatible with XC4000-series CCLK timing.
Data retention	90 years at 85°C - ensures long-term reliability in unattended industrial deployments.
Write endurance	100,000 cycles - supports field firmware updates and reconfiguration during product lifecycle.

Pinout & Package

AT17LV256-10NC is packaged in an 8-lead SOIC (8S1) with 1.27 mm pitch, 5.99 mm × 5.99 mm body, and 1.75 mm max height per JEDEC MS-012 AA. Pinout matches standard 8-lead SOIC footprint and is pin-compatible with AT17LV65/128/256 family variants.

Pin/Terminal	Circuit Role	Design Meaning
1 DATA	I/O (open-collector)	Bidirectional serial data line: outputs configuration bits during FPGA boot; accepts programming data in ISP mode.
2 CLK	Input	Asynchronous clock input driven by FPGA CCLK; increments internal address counter on rising edge.
3 RESET/OE	Input	Programmable active-Low reset / active-High output enable; resets address counter and tri-states DATA when asserted.
4 CE	Input	Chip enable (active Low); enables read access and counter increment when LOW; forces standby mode when HIGH.
5 GND	Power	Ground reference; requires 0.2 µF decoupling capacitor near VCC pin.
6 CEO	Output	Chip Enable Output (active Low); signals end-of-data to next device in cascade chain; not present on AT17LV65.
7 SER_EN	Input	Serial enable (active High); must be tied to VCC for FPGA loading; pulled LOW to enter two-wire ISP mode.
8 VCC	Power	3.3V or 5.0V supply; supports mixed-voltage system integration with appropriate level-shifting.

Key Features

Feature	Design Value
In-system programmability	Two-wire serial interface (SER_EN + DATA/CLK) enables field firmware updates without socket removal or dedicated programmers.
Cascadable configuration	CEO output drives CE of next device, allowing seamless expansion beyond 256 Kbit using multiple AT17LV256-10NC units in daisy chain.
Programmable reset polarity	User-configurable RESET/OE logic polarity via EEPROM bytes - eliminates need for external inverters in FPGA designs with non-standard reset timing.
Low-power standby	100 µA max ICCS at 3.3V/85°C - reduces system power budget during idle or partial-reconfiguration phases.
Industrial-grade reliability	90-year data retention at 85°C and 100,000 write cycles - meets long-lifecycle requirements for factory automation and infrastructure equipment.

Applications

Industrial PLC Configuration	FPGA-Based Motor Control
Use Scenario: Reconfigurable logic in programmable logic controllers loads custom I/O mapping and safety logic at power-up. IC Role / Device Role / Timing Role: Serial configuration memory providing bitstream to Xilinx Spartan FPGA; synchronized to 10 MHz CCLK with precise TOE/TCAC timing. Use Value: Enables field-upgradable control algorithms without hardware change; CEO chaining supports dual-FPGA redundancy architectures.	Use Scenario: Real-time motor drive system using Altera FLEX FPGA for PWM generation and current-loop feedback processing. IC Role / Device Role / Timing Role: Master serial boot device delivering configuration data on DATA line, triggered by FPGA CCLK; CE and RESET/OE coordinated with FPGA reset sequence. Use Value: Dual-voltage support allows integration into existing 5V motor drive boards while enabling migration to 3.3V FPGAs; 100,000 write cycles support factory calibration updates.
Reconfigurable Test Equipment	Avionics Signal Processing
Use Scenario: Modular ATE platform where FPGA configuration changes per test fixture to adapt analog/digital stimulus/response patterns. IC Role / Device Role / Timing Role: In-system programmable EEPROM storing multiple bitstreams; SER_EN-controlled ISP mode enables over-the-air reprogramming via host microcontroller. Use Value: Eliminates need for external flash or JTAG programmers; 8-lead SOIC footprint simplifies PCB layout in space-constrained test modules.	Use Scenario: Radiation-tolerant avionics subsystem using Xilinx Virtex FPGA for sensor fusion, requiring guaranteed configuration integrity after power cycling. IC Role / Device Role / Timing Role: Industrial-temperature EEPROM providing certified 90-year data retention; CEO output used to verify successful load completion before enabling FPGA logic. Use Value: Meets DO-254 traceability requirements through deterministic, controller-less boot sequence; green (RoHS) packaging complies with aerospace material directives.

Industrial PLC Configuration

FPGA-Based Motor Control

Use Scenario: Reconfigurable logic in programmable logic controllers loads custom I/O mapping and safety logic at power-up.

IC Role / Device Role / Timing Role: Serial configuration memory providing bitstream to Xilinx Spartan FPGA; synchronized to 10 MHz CCLK with precise TOE/TCAC timing.

Use Value: Enables field-upgradable control algorithms without hardware change; CEO chaining supports dual-FPGA redundancy architectures.

Use Scenario: Real-time motor drive system using Altera FLEX FPGA for PWM generation and current-loop feedback processing.

IC Role / Device Role / Timing Role: Master serial boot device delivering configuration data on DATA line, triggered by FPGA CCLK; CE and RESET/OE coordinated with FPGA reset sequence.

Use Value: Dual-voltage support allows integration into existing 5V motor drive boards while enabling migration to 3.3V FPGAs; 100,000 write cycles support factory calibration updates.

Reconfigurable Test Equipment

Avionics Signal Processing

Use Scenario: Modular ATE platform where FPGA configuration changes per test fixture to adapt analog/digital stimulus/response patterns.

IC Role / Device Role / Timing Role: In-system programmable EEPROM storing multiple bitstreams; SER_EN-controlled ISP mode enables over-the-air reprogramming via host microcontroller.

Use Value: Eliminates need for external flash or JTAG programmers; 8-lead SOIC footprint simplifies PCB layout in space-constrained test modules.

Use Scenario: Radiation-tolerant avionics subsystem using Xilinx Virtex FPGA for sensor fusion, requiring guaranteed configuration integrity after power cycling.

IC Role / Device Role / Timing Role: Industrial-temperature EEPROM providing certified 90-year data retention; CEO output used to verify successful load completion before enabling FPGA logic.

Use Value: Meets DO-254 traceability requirements through deterministic, controller-less boot sequence; green (RoHS) packaging complies with aerospace material directives.

Equivalent & Alternatives

The following parts are listed as comparable options for similar FPGA configuration memory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Xilinx XC18V02	2-Mbit capacity; 3.3V-only supply; no CEO output; different pinout (20-pin PLCC/SOIC)	Supports larger FPGAs (e.g., Virtex-II); lacks cascading capability and dual-voltage operation	Select when higher density is required and system operates exclusively at 3.3V with no daisy-chain needs.
Microchip (Atmel) AT17LV512-10NC	512-Kbit capacity; same 8-lead SOIC package; identical pinout and timing; supports same voltage/temp ranges	Provides double memory depth for XC5200 or early Virtex FPGAs; shares all control logic and ISP interface	Drop-in upgrade path when 256 Kbit proves insufficient; no PCB or firmware changes required.

Compared with XC18V02 and AT17LV512-10NC, AT17LV256-10NC offers optimal balance of industrial temperature support, dual-voltage flexibility, and cascading capability for mid-range FPGA configurations-making it preferred for cost-sensitive, field-upgradable embedded systems where 256 Kbit suffices.

Availability

AT17LV256-10NC is available at Aetrix Electronics and suitable for industrial PLCs, FPGA-based motor drives, and reconfigurable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AT17LV256-10NC 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

Microchip Technology acquired Atmel in 2016 and continues to manufacture and support the AT17LV series as legacy FPGA configuration EEPROMs.

The AT17LV product line was designed specifically for reliable, controller-less bootloading of SRAM-based FPGAs in industrial and embedded systems, emphasizing ease of use, voltage flexibility, and long-term data integrity.

FAQ

What is the maximum clock frequency supported by AT17LV256-10NC in industrial temperature range?

The AT17LV256-10NC supports a maximum clock frequency of 10 MHz at 3.3V and −40°C to +85°C. This is verified in Section 17 of the datasheet under AC Characteristics for industrial conditions. The timing parameter FMAX = 10 MHz ensures compatibility with Xilinx XC4000 and Altera FLEX FPGA CCLK requirements. AT17LV256-10NC maintains this performance without derating across its full industrial operating range.

Does AT17LV256-10NC support in-system programming (ISP), and what interface is required?

Yes, AT17LV256-10NC supports in-system programming via a two-wire serial bus. Programming is enabled by pulling SER_EN low, after which DATA and CLK serve as bidirectional serial lines. No external high-voltage programmer is needed-the device generates internal programming voltages. This capability is documented in Section 9 of the datasheet and applies directly to AT17LV256-10NC.

Can AT17LV256-10NC be used in a daisy-chain configuration with other AT17LV devices?

Yes, AT17LV256-10NC supports daisy-chaining via its CEO (Chip Enable Output) pin, which asserts low upon reaching the last memory address and enables the CE input of the next device. This feature is confirmed in Sections 4.9 and 7 of the datasheet and is functional across all AT17LV65/128/256 variants. AT17LV256-10NC's CEO output is fully compatible with AT17LV128-10NC and AT17LV65-10NC in cascaded configurations.

What is the data retention specification for AT17LV256-10NC at 85°C?

AT17LV256-10NC guarantees 90 years of data retention at 85°C for industrial-grade parts, as specified in the "High-reliability" section of the datasheet. This value is measured and validated per industry-standard EEPROM endurance testing protocols and applies specifically to the AT17LV256-10NC variant in its rated temperature range.

Is the AT17LV256-10NC pinout compatible with other members of the AT17LV65/128/256 family?

Yes, AT17LV256-10NC shares identical pinout and functionality with AT17LV65-10NC and AT17LV128-10NC in the same package type (e.g., 8-lead SOIC). Section 2 of the datasheet explicitly states that the pin configuration for AT17LV65/128/256 devices is identical, and Table 1-1 confirms 8-lead SOIC availability for all three. This enables direct substitution within the same package footprint.

AT17LV256-10NC Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Programmable Type:: Serial EEPROM

Memory Size:: 256Kb

Voltage - Supply:: 3V ~ 3.6V, 4.75V ~ 5.25V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AT17LV256-10NC FAQ

1.How can I place an order for AT17LV256-10NC through Aetrix?

Please submit a Request for Quotation (RFQ) for AT17LV256-10NC 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 AT17LV256-10NC reliable?

The price and inventory of AT17LV256-10NC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT17LV256-10NC is usually 5 days.

3.What payment methods are accepted for AT17LV256-10NC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT17LV256-10NC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT17LV256-10NC?

AT17LV256-10NC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT17LV256-10NC 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 AT17LV256-10NC?

For technical support, including AT17LV256-10NC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT17LV256-10NC requirements.

6.How does Aetrix verify that AT17LV256-10NC is sourced from the original manufacturer or authorized distributors?

All AT17LV256-10NC 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 AT17LV256-10NC meets industry standards.

7.What is the process for return or replacement of AT17LV256-10NC?

All AT17LV256-10NC units undergo pre-shipment inspection (PSI). If there is an issue with AT17LV256-10NC, 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 AT17LV256-10NC part is unused and in its original packaging.

Return procedure for AT17LV256-10NC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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