Overview
The EPM7256BFC100-5 is a member of Altera's MAX 7000B family of CPLDs, offering non-volatile, high-density programmable logic for industrial and embedded systems. With 256 macrocells and a 100-pin Fine-Pitch Ball Grid Array (FBGA) package, this device provides flexible logic integration with 5ns maximum pin-to-pin delays. Introduced in the late 1990s, this CPLD remains relevant for legacy system maintenance and certain new designs requiring deterministic timing. The device supports 3.3V operation and features in-system programmability (ISP) through the Joint Test Action Group (JTAG) interface, allowing field updates without physical removal.
Structure and Working Principle
The EPM7256BFC100-5 employs a programmable AND/fixed OR architecture with multiple Logic Array Blocks (LABs), each containing 16 macrocells. The device's interconnect structure uses a Programmable Interconnect Array (PIA) to route signals between LABs, enabling complex logic implementations. Power-on initialization loads configuration from internal EEPROM cells, providing instant operation. The 5ns speed grade indicates propagation delays between registers, making this device suitable for clock frequencies up to approximately 200MHz in typical applications. I/O pins support various standards including 3.3V LVTTL and LVCMOS.
Key Features
This CPLD offers several distinctive features including 5,000 usable gates, 256 programmable flip-flops, and up to 160 user I/O pins in the FBGA package. The device includes programmable power-saving modes that reduce standby current by up to 50%. Notable technical characteristics include 3.3V core voltage operation, built-in JTAG boundary scan testing support, and hot-socketing capability that prevents bus contention during live insertion. The architecture supports both combinatorial and registered logic implementations with individual output slew rate control for noise-sensitive applications.
Application Areas
Primary applications include bus interface logic in industrial control systems, where the device bridges different microprocessor buses or implements glue logic between ASICs. The deterministic timing makes it suitable for real-time control applications like motor drives and sensor interfaces. Other common uses include protocol conversion (e.g., UART to SPI), address decoding in embedded systems, and state machine implementations. The device frequently appears in legacy telecom equipment, test instrumentation, and military/aerospace systems requiring radiation-tolerant solutions through additional shielding.
Maintenance and Precautions
When working with the EPM7256BFC100-5, proper ESD handling procedures are essential due to the FBGA package's sensitivity. Thermal management should ensure junction temperatures remain below 125°C, with adequate airflow or heatsinking in high-ambient environments. For reliability, power supply sequencing should follow manufacturer guidelines to prevent latch-up. Designers should account for potential obsolescence risks, as this device has been in production for over two decades. Regular firmware backups are recommended when using in-system programming capabilities.
B2B Procurement Guide
When sourcing the EPM7256BFC100-5, verify authenticity through authorized distributors like Arrow or Avnet, as counterfeit devices are common in the secondary market. Lead times may vary significantly; consider alternative MAX 7000B family members for better availability. Volume pricing typically begins at around $15 per unit for 100+ quantities, with potential discounts up to 30% for larger orders. For new designs, evaluate whether modern FPGA alternatives like Intel's MAX 10 series might offer better long-term supply security and enhanced features.
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