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Microchip Technology AT17LV256-10CU
- Part No.:
- AT17LV256-10CU
- Manufacturer:
- Microchip Technology
- Category:
- Configuration PROMs for FPGAs
- Package:
- 8-TDFN
- Datasheet:
-
AT17LV256-10CU.pdf
- Description:
- IC SRL CONFIG EEPROM 256K 8-LAP
- Quantity:
- Payment:
- Shipping:
Inventory:4,229
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Product details
Overview
AT17LV256-10CU from Microchip Technology (formerly Atmel) is a 256-kbit serial EEPROM FPGA configuration memory designed to store and load bitstreams into SRAM-based FPGAs in Master Serial mode. It supports dual-voltage operation (3.0–5.5 V), offers programmable reset polarity, enables in-system programming via 2-wire bus, and features cascading capability via CEO output. It is used in industrial embedded FPGA systems requiring reliable, low-power nonvolatile configuration storage.
For engineers reviewing the AT17LV256-10CU datasheet, AT17LV256-10CU pinout, AT17LV256-10CU application, or AT17LV256-10CU equivalent, key selection criteria include its 256-kbit density, 8-lead LAP package compatibility with SOIC footprints, support for Xilinx/Altera/Atmel FPGA families, cascading readiness, and industrial temperature range (−40°C to +85°C).
Technical Context
The AT17LV256-10CU implements a serial-access EEPROM architecture optimized for FPGA configuration loading, using CLK-driven address incrementing and tri-state DATA output synchronized to CE/RESET/OE control. Its internal logic includes a programmable reset polarity latch and a write-protection mechanism tied to WP input during SER_EN-low programming mode.
It operates in two distinct functional modes: FPGA loading mode (SER_EN = High), where it responds to external FPGA clock and control signals; and ISP mode (SER_EN = Low), where it accepts 2-wire serial programming commands. The CEO output enables daisy-chain configuration of multiple devices without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 262,144 × 1-bit (256 kbit) - sufficient to configure mid-complexity SRAM FPGAs such as Xilinx XC4000 or Altera FLEX series. |
| Supply Voltage Range | 3.0 V to 5.5 V - supports both 3.3 V and 5.0 V system rails without level-shifting. |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments with no derating required. |
| Max Clock Frequency | 10 MHz at 3.3 V / 12.5 MHz at 5.0 V - matches typical FPGA CCLK timing budgets for fast configuration. |
| Write Endurance | 100,000 cycles - enables field reprogramming for design iteration or firmware updates. |
| Data Retention | 90 years at 85°C - ensures long-term reliability in unattended or sealed industrial deployments. |
| Standby Current | <50 µA at 3.3 V - minimizes power draw when CE is high and FPGA is idle. |
Pinout & Package
AT17LV256-10CU is packaged in an 8-lead Leadless Array Package (LAP), 6 mm × 6 mm × 1.04 mm body, pin pitch 1.27 mm, RoHS-compliant CuNiAu finish. This package is footprint-compatible with standard 8-lead SOIC (JEDEC MS-012), enabling drop-in replacement on legacy PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DATA | Three-state bidirectional data I/O | Open-collector output during FPGA loading; bidirectional for ISP programming; requires external pull-up. |
| CLK | Configuration clock input | Synchronizes bitstream readout; driven by FPGA's CCLK; defines timing for address increment and data output. |
| WP | Write protect input (active high) | When high, blocks writes to lowest memory block; disabled by default (internal pull-down); only available on AT17LV65/128/256. |
| RESET/OE | Programmable active-low reset / output enable | Resets internal address counter when low; enables DATA driver when high and CE is low; polarity configurable during programming. |
| CE | Chip enable input (active low) | Enables address counter and DATA driver when low; forces standby mode (<50 µA) when high. |
| GND | Ground reference | 0 V reference for all signals; requires 0.2 µF decoupling capacitor near VCC pin. |
| CEO | Chip enable output (active low) | Signals end-of-data to next device in cascade chain; goes low after final bit is read; not present on AT17LV65/128. |
| VCC | Power supply | Accepts 3.0–5.5 V; powers EEPROM core and I/O; must be stable before RESET/OE release. |
| SER_EN | Serial enable input | Must be tied high for FPGA loading; pulled low to enter 2-wire ISP mode; internal pull-up not present. |
Key Features
| Feature | Design Value |
|---|---|
| In-system programmability (ISP) | Enables field updates via 2-wire interface without removing device; eliminates need for dedicated programmers in production test. |
| Cascadable CEO output | Allows daisy-chaining multiple AT17LV256-10CU units to support larger FPGA configurations or multi-FPGA boards with single clock source. |
| Programmable reset polarity | Permits matching FPGA reset behavior (active-low or active-high) without external inverters, simplifying board-level timing design. |
| Dual-voltage compatibility | Eliminates voltage translation circuitry when interfacing with mixed 3.3 V/5.0 V FPGA platforms or legacy designs. |
| Low-power standby mode | Draws <50 µA when CE is high - critical for battery-backed or energy-constrained FPGA systems during sleep states. |
Applications
| Industrial PLC Configuration Storage | Xilinx Spartan FPGA 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: Nonvolatile configuration memory providing deterministic boot-time FPGA initialization under industrial power cycling conditions. Use Value: Ensures zero-latency FPGA reconfiguration after cold start; 90-year data retention prevents field failures due to bitstream corruption over decades of service. | Use Scenario: Loading configuration data into Xilinx Spartan-3 or Spartan-6 FPGAs used in motor control gate drivers and real-time I/O modules. IC Role / Device Role / Timing Role: Master Serial mode configuration EEPROM synchronized to FPGA's CCLK for deterministic bitstream delivery. Use Value: Eliminates external microcontroller dependency; leverages built-in FPGA boot logic; supports seamless firmware upgrades via ISP without hardware redesign. |
| Altera FLEX-Based Communication Gateway | Multi-FPGA Test Equipment |
Use Scenario: Configuring Altera FLEX 10K-series FPGAs in protocol conversion gateways connecting legacy RS-485 fieldbus to Ethernet/IP networks. IC Role / Device Role / Timing Role: Dual-voltage (3.3 V/5.0 V) configuration memory enabling direct interface to mixed-signal FPGA I/O banks without level shifters. Use Value: Reduces BOM count and layout complexity; supports hot-swap reconfiguration during network maintenance windows. | Use Scenario: Providing independent configuration storage for multiple Xilinx Virtex FPGAs on automated test equipment (ATE) mainframes requiring parallel FPGA initialization. IC Role / Device Role / Timing Role: Cascaded AT17LV256-10CU units delivering sequential bitstreams to each FPGA via CEO-to-CE daisy chain. Use Value: Enables synchronized, single-clock-domain configuration of up to 8+ FPGAs; eliminates timing skew between FPGA startups across large backplanes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FPGA configuration memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT17LV512-10CU | 512-kbit density (2× capacity); identical 8-lead LAP package and pinout; same voltage/temperature specs. | Supports larger FPGAs (e.g., Xilinx XC5200, Altera APEX) requiring >256 kbit configuration data. | Select when future FPGA upgrades demand higher bitstream capacity without changing PCB layout. |
| XCF02SVOG20C | 2-Mbit serial PROM from Xilinx; 20-pin TSSOP; 3.3 V only; no CEO cascade output; supports JTAG and master serial modes. | Designed specifically for Xilinx FPGAs; lacks dual-voltage support and cascading CEO; requires different footprint and layout. | Choose only for Xilinx-only designs where higher density and JTAG programming are prioritized over cross-vendor compatibility and cascade simplicity. |
Compared with AT17LV512-10CU, the AT17LV256-10CU offers half the memory at lower cost and power, while retaining identical footprint and cascade capability; versus XCF02SVOG20C, it provides broader FPGA vendor support and simpler daisy-chaining but less density and no JTAG interface.
Availability
AT17LV256-10CU is available at Aetrix Electronics and suitable for industrial PLCs, FPGA-based motor drives, communication gateways, and automated test equipment requiring stable component supply across extended product lifecycles.
Supply support for AT17LV256-10CU 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 legacy Atmel FPGA configuration products including the AT17LV family.
The AT17LV product line was engineered to deliver robust, low-cost, serial EEPROM-based configuration solutions for SRAM-based FPGAs across Xilinx, Altera, and Atmel FPGA platforms, emphasizing ease of integration and industrial reliability.
FAQ
What is the memory organization of the AT17LV256-10CU?
The AT17LV256-10CU contains 262,144 bits organized as 262,144 × 1-bit. It does not support byte-wide access; data is read serially, one bit per clock cycle, aligned to FPGA configuration requirements. This structure eliminates address bus overhead and matches the bit-serial nature of FPGA configuration streams.
Does the AT17LV256-10CU support both 3.3 V and 5.0 V FPGA interfaces?
Yes, the AT17LV256-10CU operates across 3.0 V to 5.5 V, making it compatible with both 3.3 V and 5.0 V FPGA I/O standards without external level shifters. Input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive strength (VOH ≥ 2.4 V at 3.3 V, VOL ≤ 0.4 V) are specified across the full voltage range per datasheet Tables 10-2 and 10-3.
Can the AT17LV256-10CU be programmed in-circuit?
Yes, the AT17LV256-10CU supports in-system programming (ISP) via its 2-wire serial interface when SER_EN is pulled low. Programming occurs at the same VCC supply voltage (no external high-voltage source needed), and industry-standard algorithms handle reset polarity and block protection settings during programming.
Is the AT17LV256-10CU pin-compatible with other AT17LV variants in the same package?
Yes, the AT17LV256-10CU shares identical pinout and electrical characteristics with AT17LV65-10CU and AT17LV128-10CU in the 8-lead LAP (8CN4) package. However, AT17LV512/010/002/040 devices use different pinouts and lack WP and CEO pins - they are not pin-compatible.
What is the purpose of the CEO pin on the AT17LV256-10CU?
The CEO (Chip Enable Output) pin on the AT17LV256-10CU asserts low after the final configuration bit is read, signaling the next device in a daisy chain to begin outputting its data. This enables seamless cascading of multiple AT17LV256-10CU units without external glue logic or timing control, reducing system complexity in multi-FPGA designs.
AT17LV256-10CU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TDFN
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Programmable Type:
- Serial EEPROM
- Memory Size:
- 256Kb
- Voltage - Supply:
- 3V ~ 3.6V, 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LAP (6x6)
AT17LV256-10CU FAQ
1.How can I place an order for AT17LV256-10CU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT17LV256-10CU 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 AT17LV256-10CU reliable?
The price and inventory of AT17LV256-10CU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT17LV256-10CU is usually 5 days.
3.What payment methods are accepted for AT17LV256-10CU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT17LV256-10CU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT17LV256-10CU?
AT17LV256-10CU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT17LV256-10CU 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 AT17LV256-10CU?
For technical support, including AT17LV256-10CU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT17LV256-10CU requirements.
6.How does Aetrix verify that AT17LV256-10CU is sourced from the original manufacturer or authorized distributors?
All AT17LV256-10CU 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 AT17LV256-10CU meets industry standards.
7.What is the process for return or replacement of AT17LV256-10CU?
All AT17LV256-10CU units undergo pre-shipment inspection (PSI). If there is an issue with AT17LV256-10CU, 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 AT17LV256-10CU part is unused and in its original packaging.
Return procedure for AT17LV256-10CU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT17LV256-10CU Tags
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AT17LV512A-10PU
Microchip Technology
-
EPCQ4ASI8N
Intel
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AT17LV256-10PU
Microchip Technology
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AT17LV256-10NU
Microchip Technology
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EPCQ16ASI8N
Intel
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AT17LV010-10PU
Microchip Technology
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EPCQ32ASI8N
Intel
-
EPCQ64ASI16N
Intel
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EPCQ128ASI16N
Intel
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AT17LV512A-10JU
Microchip Technology
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AT17LV512-10JU
Microchip Technology
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AT17LV010-10JU
Microchip Technology
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