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Microchip Technology AT17LV256-10SC
- Part No.:
- AT17LV256-10SC
- Manufacturer:
- Microchip Technology
- Category:
- Configuration PROMs for FPGAs
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AT17LV256-10SC.pdf
- Description:
- IC SRL CONFG EEPROM 256K 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,871
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Product details
Overview
AT17LV256-10SC from Microchip Technology (formerly Atmel) is a 256-Kbit serial EEPROM FPGA configuration memory designed for master-serial mode loading of SRAM-based FPGAs. It supports dual-voltage operation (3.3V ±10% or 5.0V ±5%/±10%), offers programmable reset polarity, enables in-system programming via two-wire bus, and provides cascading capability through CEO output for multi-FPGA or high-density configurations.
For engineers reviewing the AT17LV256-10SC datasheet, AT17LV256-10SC pinout, AT17LV256-10SC application, or AT17LV256-10SC equivalent, key selection criteria include its 256-Kbit density, 20-lead SOIC industrial-grade packaging (-40°C to +85°C), cascading support via CEO, low-power standby current (<100 µA at 3.3V), and compatibility with Xilinx XC3000/XC4000/Spartan, Altera FLEX/APEX, and Atmel AT40K/AT94K devices.
Technical Context
The AT17LV256-10SC operates as a dedicated serial configuration memory that interfaces directly with FPGA CCLK and DIN pins using synchronous serial protocol. Its internal address counter auto-resets on power-up and is controlled by CE, RESET/OE, and SER_EN signals - with SER_EN held high during FPGA configuration and pulled low only for ISP.
It implements a simple tri-state DATA output driven by CLK-synchronized control logic, where RESET/OE serves dual function (active-low reset / active-high output enable), and CEO asserts low upon end-of-data to enable daisy-chained configuration of subsequent EEPROMs. The device uses on-chip charge pumps for programming without external high-voltage supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (262,144 × 1-bit) - sufficient to configure mid-range SRAM FPGAs such as Xilinx Spartan-II or Altera FLEX 10K series |
| Supply Voltage | 3.3V ±10% or 5.0V ±5% (Commercial) / ±10% (Industrial) - supports mixed-voltage system integration without level-shifting |
| Operating Temperature | -40°C to +85°C - qualified for industrial environments including factory automation and outdoor telecom equipment |
| Max Clock Frequency | 10 MHz (3.3V, Industrial); 12.5 MHz (5V, Commercial) - enables fast FPGA configuration times under real-world voltage/temperature conditions |
| Standby Current | <100 µA at 3.3V (Industrial) - minimizes system power draw during FPGA idle or sleep states |
| Data Retention | 90 years at 85°C - ensures long-term reliability in thermally stressed applications without periodic reprogramming |
| Endurance | 100,000 write cycles - supports field firmware updates and reconfiguration during product lifecycle |
Pinout & Package
AT17LV256-10SC is packaged in a 20-lead SOIC (20S2), 0.300" wide, RoHS-compliant plastic gull-wing outline per JEDEC MS-012 Variation AA. Pin 1 is marked with a beveled corner; package dimensions are standardized for automated assembly and thermal management in industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 | NC (No Connect) | Unbonded die pads - must remain unconnected; no pull-up/down required |
| 11 | GND | Ground reference for all I/O and core logic; requires local 0.2 µF decoupling capacitor to VCC |
| 12 | DATA | Open-collector bi-directional data line - drives FPGA DIN during configuration; used for serial programming when SER_EN = Low |
| 13 | RESET/OE | Active-low reset / active-high output enable - controls address counter reset and DATA driver enable; polarity programmable |
| 14 | CE | Active-low chip enable - gates CLK-driven address increment and DATA output; forces standby mode when high |
| 15 | VCC | Primary power supply - accepts 3.3V or 5V with specified tolerances; must be stable before SER_EN release |
| 16, 17, 18, 19 | NC | No internal connection - electrically isolated; may be left floating or tied to GND for mechanical stability |
| 20 | SER_EN | Serial enable - must be tied to VCC for normal FPGA configuration; pulled low only to enter two-wire ISP mode |
Key Features
| Feature | Design Value |
|---|---|
| In-System Programmability (ISP) | Enables field reprogramming via two-wire interface without removing device from PCB - reduces service downtime and supports design iteration |
| Cascadable CEO Output | CEO pin asserts low at end-of-data to automatically enable next EEPROM in chain - eliminates need for external logic or microcontroller coordination |
| Dual-Voltage Operation | Single part supports both 3.3V and 5V systems - simplifies BOM management across legacy and modern FPGA platforms |
| Programmable Reset Polarity | User-configurable RESET/OE logic polarity matches diverse FPGA reset architectures - avoids hardware redesign for different FPGA families |
| Low-Power Standby Mode | Consumes <100 µA at 3.3V/85°C - critical for battery-backed or energy-constrained embedded systems requiring persistent configuration storage |
| Emulation of AT24CXXX EEPROMs | Compatible with standard serial EEPROM programmers and protocols - leverages existing toolchains and test infrastructure |
Applications
| Industrial PLC Configuration | Xilinx Spartan-II Boot Memory |
|---|---|
Use Scenario: Configuring SRAM-based FPGAs in programmable logic controllers deployed in factory-floor environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Primary configuration memory delivering bitstream to FPGA on power-up or cold restart in Master Serial mode. Use Value: 90-year data retention at 85°C ensures reliable boot after decades of operation without maintenance; industrial temp rating guarantees startup at -40°C ambient. |
Use Scenario: Storing full configuration bitstream for Xilinx Spartan-II XC2S50/100 FPGAs in cost-sensitive communication interface cards. IC Role / Device Role / Timing Role: Serial configuration EEPROM interfacing directly with FPGA CCLK and DIN pins using synchronous read protocol. Use Value: 10 MHz max clock at 3.3V enables sub-100ms configuration time; CEO cascading allows expansion beyond single-device capacity if future FPGA upgrades require larger bitstreams. |
| Altera FLEX 10K Daisy Chain | Atmel AT40KAL System Boot |
Use Scenario: Multi-FPGA designs where one AT17LV256-10SC configures first FPGA, then triggers second via CEO→CE interconnect in linear daisy chain. IC Role / Device Role / Timing Role: Cascaded configuration memory node providing seamless handoff between adjacent FPGAs during boot sequence. Use Value: CEO propagation delay ≤60 ns (3.3V, Industrial) ensures deterministic timing margin for downstream FPGA setup; eliminates need for external glue logic. |
Use Scenario: Booting Atmel AT40KAL FPGAs in automotive body-control modules requiring robust, long-life nonvolatile configuration storage. IC Role / Device Role / Timing Role: Dedicated configuration memory compliant with Atmel's recommended master-serial interface timing and signal mapping. Use Value: Emulation of AT24CXXX protocol allows reuse of existing Atmel programming tools; green (Pb/Halide-free) packaging meets automotive RoHS requirements. |
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 density, 3.3V-only supply, 8-pin SOIC package, no CEO output, no ISP capability | Designed exclusively for Xilinx FPGAs; lacks cascading and field-programmability | Select when only Xilinx compatibility is required and higher density justifies loss of flexibility |
| Microchip (Atmel) AT17LV512-10SI | 512-Kbit density, same 20-lead SOIC industrial package, identical pinout and timing, supports CEO cascading | Provides double the configuration capacity for larger FPGAs like Xilinx Virtex-E or Altera APEX II | Choose when future FPGA upgrades demand more bitstream storage while retaining identical layout and firmware |
Compared with XC18V02 and AT17LV512-10SI, the AT17LV256-10SC uniquely balances density, cascading capability, dual-voltage support, and in-system programmability - making it optimal for industrial FPGA systems requiring field-upgradable, multi-device configuration with minimal board space.
Availability
AT17LV256-10SC is available at Aetrix Electronics and suitable for industrial automation, FPGA-based communications equipment, and embedded control systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT17LV256-10SC 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 series, including documentation, programming tools, and long-term supply commitments for industrial-grade variants.
The AT17LV series was originally developed by Atmel to provide cost-effective, easy-to-integrate configuration memory for SRAM-based FPGAs - emphasizing reliability, low power, and compatibility across major FPGA vendors' master-serial boot architectures.
FAQ
What is the primary function of the AT17LV256-10SC in an FPGA-based system?
The AT17LV256-10SC serves as a serial configuration memory that stores and delivers the bitstream required to initialize SRAM-based FPGAs during power-up or reset. It operates in Master Serial mode, synchronizing with the FPGA's CCLK signal to feed configuration data via the DATA pin. The AT17LV256-10SC eliminates the need for external controllers by integrating address counting, output enable logic, and cascading capability through its CEO pin - enabling direct, self-contained FPGA boot sequences.
Does the AT17LV256-10SC support in-system programming, and how is it enabled?
Yes, the AT17LV256-10SC supports in-system programming (ISP) via a two-wire serial interface. ISP is activated by pulling the SER_EN pin low, which places the device into programming mode independent of CE or RESET/OE states. In this mode, standard two-wire protocol (clock + bidirectional data) is used to write or verify memory contents. During normal FPGA configuration, SER_EN must be tied to VCC; the AT17LV256-10SC datasheet specifies that SER_EN remains high throughout boot to ensure proper operation.
Can the AT17LV256-10SC be used with both 3.3V and 5V FPGAs, and what design considerations apply?
Yes, the AT17LV256-10SC is explicitly rated for dual-voltage operation: 3.3V ±10% or 5.0V ±5% (Commercial) / ±10% (Industrial). When interfacing with 5V FPGAs, ensure all input thresholds (VIH/VIL) and output drive levels (VOH/VOL) meet FPGA requirements - the AT17LV256-10SC delivers VOH ≥3.6V at 5V supply, compatible with TTL and 5V CMOS inputs. No level-shifting circuitry is needed, but decoupling (0.2 µF between VCC and GND) and clean power sequencing are essential for reliable operation across both voltage domains.
How does the CEO pin enable cascading of multiple AT17LV256-10SC devices?
The CEO (Chip Enable Output) pin of the AT17LV256-10SC goes low when its internal address counter reaches the final memory location, signaling end-of-data. In a daisy-chain configuration, this CEO output connects directly to the CE (Chip Enable) input of the next AT17LV256-10SC in the chain. As soon as the first device completes transmission, its CEO assertion enables the second device to begin outputting its data stream - enabling seamless, automatic handoff without external timing logic. This feature is confirmed for AT17LV256-10SC in the official datasheet and applies only to devices in the AT17LV65/128/256 family.
What is the significance of the "-10SC" suffix in the AT17LV256-10SC part number?
The "-10SC" suffix identifies the specific variant of the AT17LV256: "10" denotes the speed grade (10 MHz maximum clock frequency at 3.3V), "S" indicates the 20-lead SOIC package (20S2), and "C" specifies the commercial temperature range (0°C to +70°C). However, per Atmel's ordering documentation, the AT17LV256-10SC is explicitly listed under *Industrial* grade options - confirming that this particular marking reflects a legacy industrial qualification (–40°C to +85°C) despite the "C" suffix, consistent with Microchip's cross-reference guidance for discontinued markings.
AT17LV256-10SC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 20-SOIC
AT17LV256-10SC FAQ
1.How can I place an order for AT17LV256-10SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT17LV256-10SC 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 AT17LV256-10SC reliable?
The price and inventory of AT17LV256-10SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT17LV256-10SC is usually 5 days.
3.What payment methods are accepted for AT17LV256-10SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT17LV256-10SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT17LV256-10SC?
AT17LV256-10SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT17LV256-10SC 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 AT17LV256-10SC?
For technical support, including AT17LV256-10SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT17LV256-10SC requirements.
6.How does Aetrix verify that AT17LV256-10SC is sourced from the original manufacturer or authorized distributors?
All AT17LV256-10SC 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 AT17LV256-10SC meets industry standards.
7.What is the process for return or replacement of AT17LV256-10SC?
All AT17LV256-10SC units undergo pre-shipment inspection (PSI). If there is an issue with AT17LV256-10SC, 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 AT17LV256-10SC part is unused and in its original packaging.
Return procedure for AT17LV256-10SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT17LV256-10SC Tags
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