PAL20C1CNS

The 24-pin Small PAL family contains six popular PAL archi-tectures. The devices in the Small PAL family draw only 100 mA maximum supply current as compared to 210 mA in the 24-pin Medium PAL devices. These devices offer speeds as fast as 25 ns maximum propagation delay. Na-tional Semiconductor’s Schottky TTL process with titanium tungsten fusible links provides high-speed user-programma-ble replacements for conventional SSI/MSI logic with signif-icant chip-count reduction. Programmable logic devices provide convenient solutions for a wide variety of application-specific functions, including random logic, custom decoders, state machines, etc. By programming fusible links to configure AND/OR gate con-nections, the system designer can implement custom logic as convenient sum-of-products Boolean functions. System prototyping and design iterations can be performed quickly using these off-the-shelf products. A large variety of pro-gramming units and software makes design development and functional testing of PAL devices quick and easy. The Small PAL logic array has between 12 and 20 comple-mentary inputs and up to 10 combinatorial outputs generat-ed by a single programmable AND-gate array with fixed OR-gate connections. The Small PAL family offers a variety of input/output combinations as shown in the Device Types table below. Security fuses can be programmed to prevent direct copying of proprietary logic patterns.