EPM7256SRC208-10N

Overview

The EPM7256SRC208-10N is a Complex Programmable Logic Device (CPLD) from Intel's (formerly Altera) MAX 7000S family. Introduced in the late 1990s, this 5V-powered device remains relevant for legacy system maintenance and industrial applications requiring deterministic timing. With 256 macrocells and 10ns propagation delays, it bridges the gap between discrete logic and FPGAs. The 208-pin RQFP package offers robust connectivity options while maintaining a compact footprint. As an SRAM-based device, it requires configuration at power-up but retains programming during operation. Its architecture supports combinatorial and sequential logic implementations, making it versatile for control-oriented designs.

Structure and Working Principle

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The device's architecture consists of multiple Logic Array Blocks (LABs), each containing 16 macrocells. These connect through a Programmable Interconnect Array (PIA), allowing flexible routing. Each macrocell can implement either combinatorial or registered logic functions with programmable polarity. Configuration occurs via JTAG interface or parallel programming modes, storing the logic pattern in on-chip EEPROM cells. The 10ns timing specification ensures predictable performance for critical control applications. Power consumption varies with switching activity but typically operates below 500mW in most implementations.

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Key Features

The 10ns pin-to-pin delay makes this CPLD suitable for high-speed control applications where timing consistency matters. The 256-macrocell capacity allows implementation of moderately complex state machines or bus interfaces. In-system programmability enables field updates without physical replacement. Notable features include 5V TTL compatibility, 100% utilization of all pins as I/O, and hot-socketing capability. The device supports multiple clock sources with programmable skew control. Security features include a programmable bitstream encryption option to protect intellectual property.

Application Areas

Primary applications include industrial control systems, where it performs logic consolidation and interface translation between disparate components. Common uses involve legacy PCI bridging, UART multiplexing, and custom timing generators in test equipment. In telecommunications, the device handles protocol conversion and signal conditioning tasks. Automotive applications include dashboard instrument clusters and simple ECU functions. The military/aerospace sector employs these CPLDs for radiation-tolerant designs when packaged in appropriate enclosures.

Maintenance and Precautions

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While robust, these CPLDs require proper ESD handling during installation. The 208-pin package demands careful soldering—recommended reflow profiles should not exceed 220°C for more than 60 seconds. Power supply decoupling is critical, with at least 0.1μF capacitors required near every VCC pin. For long-term reliability, avoid exceeding the 70°C ambient temperature specification in enclosed designs. When programming multiple units, verify voltage levels on the configuration interface to prevent lock-up conditions. Regularly back up programming files as obsolete support tools become harder to maintain.

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B2B Procurement Guide

When sourcing EPM7256SRC208-10N, verify authenticity as counterfeit devices exist in the market. Authorized distributors typically offer better traceability than brokers. Consider minimum order quantities—prices drop significantly for lots of 100+ units. Lead times vary; new old stock (NOS) ships immediately but may carry date code risks. For production volumes, explore pin-compatible alternatives like the EPM7256AETC100-10 for potential cost savings. Always request sample testing before large purchases to confirm functionality with your toolchain.