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GENERAL DESCRIPTION

The PALCE20V8 is an advanced PAL device built with low-power, high-speed, electrically erasable CMOS technology. Its macrocells provide a universal device architecture. The PALCE20V8 is fully compatible with the GAL20V8 and can directly replace PAL20R8 series devices and most 24-pin combinatorial PAL devices.

Device logic is automatically configured according to the user’s design specification. A design is implemented using any of a number of popular design software packages, allowing automatic creation of a programming file based on Boolean or state equations. Design software also verifies the design and can provide test vectors for the finished device. Programming can be accomplished on standard PAL device programmers.

DISTINCTIVE CHARACTERISTICS

◆ Pin and function compatible with all PAL? 20V8 devices

◆ Electrically erasable CMOS technology provides reconfigurable logic and full testability

◆ High-speed CMOS technology

— 5-ns propagation delay for “-5” version

— 7.5-ns propagation delay for “-7” version

◆ Direct plug-in replacement for a wide range of 24-pin PAL devices

◆ Programmable enable/disable control

◆ Outputs individually programmable as registered or combinatorial

◆ Peripheral Component Interconnect (PCI) compliant

◆ Preloadable output registers for testability

◆ Automatic register reset on power-up

◆ Cost-effective 24-pin plastic SKINNY DIP and 28-pin PLCC packages

◆ Extensive third-party software and programmer support

◆ Fully tested for 100% programming and functional yields and high reliability

◆ Programmable output polarity

◆ 5-ns version utilizes a split leadframe for improved performance