Microchip Technology AT17LV256-10JC

Overview

AT17LV256-10JC from Atmel is a 256-Kbit (262,144 × 1-bit) serial EEPROM FPGA configuration memory supporting both 3.3V and 5.0V operation, featuring in-system programmability via two-wire bus, programmable reset polarity, and cascading capability for multi-FPGA systems. It targets SRAM-based FPGA configuration in industrial embedded control and reconfigurable logic applications.

For engineers reviewing the AT17LV256-10JC datasheet, AT17LV256-10JC pinout, AT17LV256-10JC application, or AT17LV256-10JC equivalent, key selection criteria include voltage flexibility (3.3V/5V), industrial temperature range (−40°C to +85°C), 20-lead PLCC package compatibility, cascading CEO support, and EEPROM endurance (100,000 write cycles).

Technical Context

The AT17LV256-10JC implements a serial master-mode configuration interface synchronized to FPGA CCLK, with tri-state DATA output controlled by RESET/OE and CE. Its address counter auto-resets on power-up and supports programmable active-Low RESET polarity.

It uses a low-power CMOS EEPROM process with dedicated SER_EN pin to enable two-wire ISP mode; during FPGA loading, SER_EN is held high. The CEO output enables daisy-chained configurations by driving CE of the next device upon reaching end-of-memory.

Key Specifications

Pinout & Package

AT17LV256-10JC is packaged in a 20-lead Plastic Leaded Chip Carrier (PLCC) with 1.27 mm lead pitch, JEDEC MS-018 compliant, footprint dimensions 10.033 mm × 10.033 mm × 4.572 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC18V02 and 25LC512, AT17LV256-10JC uniquely combines 3.3V/5V operation, programmable reset polarity, and native CEO-based daisy-chaining-enabling drop-in compatibility across Atmel, Xilinx, and Altera FPGA platforms without redesign.

Availability

AT17LV256-10JC is available at Aetrix Electronics and suitable for industrial PLCs, FPGA-based motor control systems, and reconfigurable test equipment requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.

Supply support for AT17LV256-10JC 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 semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and FPGA configuration solutions.

The AT17LV series was designed specifically as cost-effective, easy-to-integrate serial configuration memory for SRAM-based FPGAs-including Xilinx, Altera, and Atmel's own FPGA families-emphasizing voltage flexibility, industrial reliability, and cascading scalability.

FAQ

What is the memory organization of the AT17LV256-10JC?

The AT17LV256-10JC contains 262,144 words × 1-bit of EEPROM memory, totaling 256 Kbit. This organization is optimized for serial bitstream loading into SRAM-based FPGAs such as Xilinx XC4000 and Altera FLEX devices. Each bit is individually accessible via the serial interface, with automatic address incrementing on CLK edges during configuration mode.

Does the AT17LV256-10JC support both 3.3V and 5.0V operation?

Yes, the AT17LV256-10JC supports dual-voltage operation: 3.3 V ±10% and 5.0 V ±5% (Commercial) or ±10% (Industrial). This allows direct integration into mixed-voltage systems without level shifters. DC and AC characteristics are separately specified for each voltage, and the device automatically adapts timing and drive strength accordingly.

How does the CEO pin function in the AT17LV256-10JC?

The CEO (Chip Enable Output) pin on the AT17LV256-10JC goes Low when the internal address counter reaches its maximum value (end-of-memory). In a daisy chain, this signal drives the CE input of the next AT17LV device, enabling automatic handoff of configuration data. CEO remains Low while CE is Low and OE is High, then follows CE until OE goes Low-ensuring glitch-free cascading.

Can the AT17LV256-10JC be programmed in-system?

Yes, the AT17LV256-10JC supports in-system programming (ISP) via a two-wire serial interface. This is enabled by pulling SER_EN low, allowing field updates using industry-standard programmers or Atmel's ATDH2225 ISP Cable. Programming occurs at the same VCC supply voltage used for operation-no external high-voltage source is required.

What is the operating temperature range for the AT17LV256-10JC?

The AT17LV256-10JC is rated for industrial operation from −40°C to +85°C. This range is validated across all electrical specifications including DC parameters (e.g., VIH/VIL), AC timing (e.g., TCAC, FMAX), and reliability metrics (e.g., 90-year data retention at 85°C). The 20J PLCC package provides θJA = 90°C/W thermal performance under still-air conditions.