CS82C37A

Specialized Overview

The CS82C37A is a CMOS high-performance programmable Direct Memory Access (DMA) controller manufactured by Harris Corporation. It serves as an enhanced version of the industry-standard NMOS 8237A, fabricated using advanced 2-micron CMOS technology. The device maintains pin compatibility with NMOS designs while offering increased functionality and significantly reduced power consumption. Key electrical specifications include a maximum clock frequency of 8 MHz, four DMA channels, and an 8-bit external data bus width. It supports address buses up to 16 bits wide and operates within a commercial temperature range of 0°C to 70°C.

Specialized Feature Summary

• Four independent maskable channels with autoinitialization capability
• Fully static CMOS design permitting low power operation and gated clock functionality
• Compatible with NMOS 8237A for direct replacement in existing systems
• Supports memory-to-memory transfers and cascading to any number of channels

Specialized Applications

• Data transfer operations in IBM PC/AT compatible systems
• High-speed peripheral interfacing requiring direct memory access
• Embedded systems utilizing 8086, 8088, or 80286 processors

Specialized Procurement Notes

Verify component authenticity through manufacturer documentation or authorized distributors. Confirm package type and suffix codes match specific system requirements. Check RoHS compliance status as older CMOS components may not meet current environmental standards. Ensure proper handling procedures are followed due to potential sensitivity to electrostatic discharge during installation.

Specialized Selection Notes

Select this component when upgrading from NMOS 8237A designs to reduce power consumption without changing board layout. Consider the 8 MHz clock limit for timing-critical applications. Verify that the 4-channel capacity meets system I/O requirements. Evaluate thermal management needs if operating near the upper temperature limit.

Specialized Part Context

The CS82C37A belongs to the Harris 82C37 family of DMA controllers. It is part of a lineage including variants like CD82C37A and CP82C37A, which share core architectural features but differ in packaging, speed grades, or industrial temperature ratings. This specific designation represents the standard commercial grade CMOS implementation.

Specialized Replacement Considerations

Direct pin-compatible replacements include the NMOS 8237A, though performance characteristics will differ. Other Harris variants such as CD82C37A offer similar functionality with potentially different package options. Third-party CMOS equivalents may exist but require verification of electrical parameters and timing specifications.