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

Microchip Technology AT17LV256-10CC

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

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Part No.:: AT17LV256-10CC

Manufacturer:: Microchip Technology

Category:: Configuration PROMs for FPGAs

Package:: 8-TDFN

Datasheet:: AT17LV256-10CC.pdf

Description:: IC SRL CONFG EEPROM 256K LV 8LAP

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Product details

Overview

AT17LV256-10CC from Microchip Technology (formerly Atmel) is a 256-Kbit serial EEPROM FPGA configuration memory designed for reliable, in-system programmable storage of bitstreams in SRAM-based FPGAs. It supports both 3.3V and 5.0V operation, features programmable reset polarity, cascading capability via CEO output, and is rated for 100,000 write cycles with 90-year data retention at 85°C (industrial grade). It interfaces directly with Xilinx XC3000/XC4000/Spartan, Altera FLEX/APEX, and Atmel AT40K/AT94K devices.

For engineers reviewing the AT17LV256-10CC datasheet, AT17LV256-10CC pinout, AT17LV256-10CC application, or AT17LV256-10CC equivalent, key selection criteria include its 8-lead LAP (6 mm × 6 mm) package compatibility with SOIC footprints, dual-voltage support, low-power standby current (<100 µA at 3.3V), and verified interoperability with industry-standard FPGA master serial configuration protocols.

Technical Context

The AT17LV256-10CC implements a serial-access configuration memory architecture optimized for FPGA boot loading: it uses a synchronous clock-driven address counter triggered by CLK, with CE and RESET/OE controlling tri-state DATA output and counter reset. Its SER_EN pin enables two-wire ISP mode, while CEO provides daisy-chain enable signaling between cascaded configurators - a feature confirmed present on AT17LV256 devices per Pin Description Table and Figure 2-4.

Unlike later AT17LV family members (e.g., AT17LV512), the AT17LV256-10CC includes WP (Write Protect) input but excludes WP1/WP2 and READY pins. Its timing is defined by AC parameters including TCAC (CLK-to-DATA delay ≤80 ns at 3.3V industrial), FMAX (10 MHz max clock frequency), and THOE (OE high time ≥25 ns to guarantee counter reset), all validated for 8-lead LAP, PDIP, and SOIC packages per Tables 17–20.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	256 Kbit (262,144 × 1-bit) - sufficient for mid-complexity FPGA configurations such as Xilinx Spartan-II or Altera FLEX 10K devices.
Supply voltage	3.3V (±10%) or 5.0V (±5% commercial / ±10% industrial) - enables drop-in use across legacy 5V and modern 3.3V FPGA systems without level-shifting.
Standby current	<100 µA at 3.3V industrial - ensures minimal power draw during FPGA configuration hold or system sleep states.
Endurance	100,000 write cycles - supports repeated reprogramming during development, field updates, and manufacturing test cycles.
Data retention	90 years at 85°C (industrial) - guarantees long-term reliability in embedded control, telecom, and industrial automation applications.
Max clock frequency	10 MHz (3.3V industrial) - aligns with standard FPGA CCLK timing budgets for robust, noise-immune serial loading.
Operating temperature	−40°C to +85°C - qualified for extended industrial environments without derating.

Pinout & Package

AT17LV256-10CC is packaged in an 8-lead Leadless Array Package (LAP), 6 mm × 6 mm × 1.04 mm body, pin pitch 1.27 mm, pin-compatible with 8-lead SOIC footprints. Thermal resistance θJA = 115.71°C/W (commercial) per Table 21-1.

Pin	Circuit Role	Design Meaning
1 (DATA)	I/O bidirectional open-collector	Serial data path for configuration bitstream output to FPGA DIN; also used for two-wire ISP programming.
2 (CLK)	Input	Drives internal address/bit counter; synchronized to FPGA CCLK for deterministic bitstream delivery.
3 (RESET/OE)	Input	Programmable active-Low reset / active-High output enable; controls DATA driver state and counter reset.
4 (CE)	Input	Chip enable (active Low); disables counter and forces DATA into high-impedance when High, enabling low-power standby.
5 (VCC)	Power	Single-supply input supporting 3.3V or 5.0V; requires 0.2 µF decoupling capacitor to GND.
6 (SER_EN)	Input	Serial enable (High = FPGA load mode; Low = two-wire ISP programming mode).
7 (CEO)	Output	Chip Enable Output (active Low); signals end-of-data to next cascaded AT17LV device in daisy-chain topology.
8 (GND)	Ground	Reference return path; must be connected with low-inductance layout to minimize noise coupling into DATA/CLK lines.

Key Features

Feature	Design Value
In-system programmability (ISP)	Enables field firmware updates via two-wire bus without removing the device - critical for remote system maintenance and version rollouts.
Cascadable CEO output	Allows seamless daisy-chaining of multiple AT17LV256-10CC units to support larger FPGA bitstreams or multi-FPGA systems without external logic.
Programmable reset polarity	Permits configuration for either active-Low RESET or active-High OE behavior - eliminates need for external inverters in mixed-FPGA designs.
Dual-voltage operation	Eliminates voltage translation circuitry when interfacing with both legacy 5V and modern 3.3V FPGA families, reducing BOM count and board space.
Emulation of AT24CXXX EEPROMs	Enables reuse of existing AT24CXXX-based programming infrastructure and software tools, lowering integration effort.

Applications

Industrial PLC Configuration	Xilinx Spartan-II Boot Memory
Use Scenario: Storing FPGA configuration bitstreams in programmable logic controllers deployed in factory automation environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Primary nonvolatile configuration memory providing deterministic, single-shot boot loading upon power-up or watchdog-triggered reset. Use Value: 90-year data retention at 85°C and −40°C to +85°C operating range ensure unattended operation over full product lifecycle without bitstream corruption.	Use Scenario: Supplying configuration data to Xilinx Spartan-II FPGAs in cost-sensitive communications interface cards requiring fast, reliable initialization. IC Role / Device Role / Timing Role: Master serial configuration EEPROM synchronized to FPGA CCLK; delivers 256 Kbit bitstream at up to 10 MHz. Use Value: Pin-compatible 8-lead LAP package allows direct replacement of SOIC footprint memories, minimizing PCB redesign effort.
Altera FLEX 10K System Boot	Multi-FPGA Daisy-Chain Configuration
Use Scenario: Configuring Altera FLEX 10K series FPGAs in legacy industrial motion control boards where 5V supply rails remain in use. IC Role / Device Role / Timing Role: Voltage-flexible configuration memory supporting 5.0V ±10% industrial operation without level shifters or regulators. Use Value: Dual-voltage support avoids redesign when migrating from older 5V-only systems to hybrid 3.3V/5V platforms.	Use Scenario: Cascading three AT17LV256-10CC devices to configure a large Xilinx Virtex FPGA requiring >700 Kbit of configuration memory. IC Role / Device Role / Timing Role: First-stage configurator asserting CEO to enable second-stage CE, enabling automatic handoff after end-of-data detection. Use Value: Hardware-managed daisy-chain eliminates need for FPGA GPIO or microcontroller intervention during multi-device boot sequences.

Industrial PLC Configuration

Xilinx Spartan-II Boot Memory

Use Scenario: Storing FPGA configuration bitstreams in programmable logic controllers deployed in factory automation environments with wide temperature swings and EMI exposure.

IC Role / Device Role / Timing Role: Primary nonvolatile configuration memory providing deterministic, single-shot boot loading upon power-up or watchdog-triggered reset.

Use Value: 90-year data retention at 85°C and −40°C to +85°C operating range ensure unattended operation over full product lifecycle without bitstream corruption.

Use Scenario: Supplying configuration data to Xilinx Spartan-II FPGAs in cost-sensitive communications interface cards requiring fast, reliable initialization.

IC Role / Device Role / Timing Role: Master serial configuration EEPROM synchronized to FPGA CCLK; delivers 256 Kbit bitstream at up to 10 MHz.

Use Value: Pin-compatible 8-lead LAP package allows direct replacement of SOIC footprint memories, minimizing PCB redesign effort.

Altera FLEX 10K System Boot

Multi-FPGA Daisy-Chain Configuration

Use Scenario: Configuring Altera FLEX 10K series FPGAs in legacy industrial motion control boards where 5V supply rails remain in use.

IC Role / Device Role / Timing Role: Voltage-flexible configuration memory supporting 5.0V ±10% industrial operation without level shifters or regulators.

Use Value: Dual-voltage support avoids redesign when migrating from older 5V-only systems to hybrid 3.3V/5V platforms.

Use Scenario: Cascading three AT17LV256-10CC devices to configure a large Xilinx Virtex FPGA requiring >700 Kbit of configuration memory.

IC Role / Device Role / Timing Role: First-stage configurator asserting CEO to enable second-stage CE, enabling automatic handoff after end-of-data detection.

Use Value: Hardware-managed daisy-chain eliminates need for FPGA GPIO or microcontroller intervention during multi-device boot sequences.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT17LV256-10PC	Same 256-Kbit capacity and electrical specs, but in 8-lead PDIP package (0.300" width) instead of LAP.	Used where through-hole assembly, prototyping, or socket-based debugging is required; not surface-mount compatible with AT17LV256-10CC footprint.	Select when manual soldering, breadboarding, or legacy board repair necessitates DIP form factor.
AT17LV256-10CU	Identical functionality and LAP package, but RoHS-compliant (Pb/halide-free) and rated for industrial temperature only (−40°C to +85°C).	Required for new designs targeting green compliance and extended temperature operation; not suitable for commercial-grade (0°C to +70°C) applications.	Select for environmentally regulated deployments or where long-term supply continuity favors green variants.

Compared with AT17LV256-10PC and AT17LV256-10CU, the AT17LV256-10CC offers commercial-temperature-rated (0°C to +70°C) operation in a compact, surface-mount 8-lead LAP package - making it optimal for high-volume, space-constrained consumer and industrial electronics where RoHS is not mandated and ambient temperatures remain within commercial limits.

Availability

AT17LV256-10CC is available at Aetrix Electronics and suitable for industrial PLCs, FPGA-based communications interfaces, legacy 5V motion control systems, and multi-FPGA daisy-chain configurations requiring stable component supply and long-term obsolescence management.

Supply support for AT17LV256-10CC 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 maintains full support for the legacy AT17LV FPGA configuration EEPROM portfolio, including datasheets, application notes, and long-term supply commitments.

The AT17LV series was originally developed by Atmel to provide cost-effective, pin-compatible configuration memory solutions for SRAM-based FPGAs - emphasizing ease of integration, dual-voltage flexibility, and field-programmability without external controllers.

FAQ

What is the primary function of the AT17LV256-10CC in an FPGA system?

The AT17LV256-10CC serves as a dedicated serial configuration EEPROM that stores and delivers the bitstream required to initialize SRAM-based FPGAs such as Xilinx Spartan-II, Altera FLEX 10K, and Atmel AT40K devices. It operates in master serial mode, driven by the FPGA's CCLK signal, and outputs configuration data on the DATA line synchronously with CLK edges. Its design eliminates the need for external microcontrollers during boot, enabling autonomous, repeatable FPGA configuration at power-up or reset.

Does the AT17LV256-10CC support both 3.3V and 5.0V supply voltages simultaneously?

No - the AT17LV256-10CC operates on a single VCC supply, selectable at design time as either 3.3V (±10%) or 5.0V (±5% commercial / ±10% industrial). It does not support dual-supply operation. The device's I/O thresholds and DC characteristics are internally scaled to match the applied VCC, ensuring correct logic levels and timing margins under either voltage. This flexibility allows one AT17LV256-10CC design to serve both legacy 5V and modern 3.3V FPGA platforms without hardware modification.

Can the AT17LV256-10CC be programmed in-circuit without removal from the PCB?

Yes - the AT17LV256-10CC supports In-System Programming (ISP) via a two-wire serial bus when the SER_EN pin is pulled Low. This enables field updates, firmware revisions, and manufacturing programming without desoldering. Programming occurs at the same VCC supply voltage used for normal operation, with internal charge pumps generating required programming voltages. Industry-standard programmers like the Atmel ATDH2225 ISP Cable or compatible third-party tools can be used, and the process preserves all other device functionality including CEO daisy-chaining and reset polarity configuration.

What is the role of the CEO pin on the AT17LV256-10CC, and is it available on all package types?

The CEO (Chip Enable Output) pin on the AT17LV256-10CC is an active-Low open-collector output that asserts Low when the internal address counter reaches its maximum value (end-of-memory), signaling completion of configuration data transfer. In daisy-chain topologies, CEO of one AT17LV256-10CC drives the CE input of the next device, enabling automatic handoff. Per Pin Description Table and Figures 2-1 through 2-5, CEO is present and functional on all AT17LV256-10CC package variants - including 8-lead LAP (pin 7), 8-lead PDIP (pin 7), 8-lead SOIC (pin 7), 20-lead PLCC (pin 14), and 20-lead SOIC (pin 14).

How does the programmable reset polarity feature work on the AT17LV256-10CC?

The AT17LV256-10CC allows users to configure the RESET/OE pin's logic polarity via four programmable EEPROM bytes - selecting either active-Low RESET (default for most Xilinx FPGAs) or active-High OE (common for certain Altera implementations). This setting is retained across power cycles and is performed during initial programming using an industry-standard programmer or ISP tool. Once set, the device interprets the pin accordingly: in RESET mode, a Low pulse resets the address counter and tri-states DATA; in OE mode, a High level enables DATA output. No external components are needed to adapt to differing FPGA reset architectures.

AT17LV256-10CC Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TDFN

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-LAP (6x6)

AT17LV256-10CC FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your AT17LV256-10CC 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 AT17LV256-10CC?

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

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

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

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

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

Return procedure for AT17LV256-10CC:

1.Submit a request within 90 days.

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

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