PALC22V10B-20WMB

The PALC22V10B-20WMB is a CMOS UV-erasable Programmable Array Logic device from the AMD (Vantis) legacy product line, subsequently managed under Cypress Semiconductor. It implements the industry-standard 22V10 architecture with a 20 ns pin-to-pin propagation delay, indicated by the -20 speed grade, and is housed in a windowed ceramic dual-in-line package (CERDIP) to permit ultraviolet erasure and reprogramming. Each of the ten configurable I/O macrocells supports registered or combinatorial operation with selectable output polarity, enabling dense glue logic and state machine integration. The WMB suffix designates a military temperature range device rated for operation from -55°C to +125°C, making the component suitable for high-reliability environments where extended temperature performance and hermetic sealing are mandatory.

Typical applications include legacy aerospace and defense platforms such as flight control interfaces, radar signal processing, and encrypted communication systems, along with industrial control modules that cannot migrate to newer programmable logic due to requalification constraints. As an obsolete part no longer produced by the original manufacturer, procurement is limited to residual distributor stock or tested surplus. Evaluating lot traceability, window lid integrity, and UV-erasable cell retention is essential to avoid latent programming failures. The PALC22V10B-20WMB remains a critical sustainment component where exact functional and timing compatibility must be preserved without board redesign, and it is commonly specified in military-standard avionics and ground-based equipment requiring a drop-in replacement for legacy AMD/Vantis PALs.