The Atmel V5000 is an easy to use, high density programmable logic device. Its simple, regular architecture translates into increased utilization and high performance. The ATV5000 has one programmable combinatorial logic array. This guarantees easy interconnection of and uniform performance from all nodes. "Sum terms", which are easy to use groupings of AND-OR gates, provide combinatorial logic blocks. Sum terms can be wireOR'd together to integrate larger logic blocks. To expand the levels of logic, buried sum terms feed back into the logic array. The 52 I/O pins can each be driven by a register or a sum term. Each I/O pin has an individually enabled input latch. All 128 registers are configurable as D- or T-types without using extra logic gates. Individual sum terms, asynchronous presets, resets and clocks give each flip-flop added flexibility. A direct "clock from pin" option guarantees synchronization and fast clock to output performance. Standard, off-the-shelf third-party software tools and programmers support the ATV5000. This minimizes start-up investment and improves product support. JLCC