CS82C237-12

Specialized Overview

The CS82C237-12 is a CMOS High Performance Programmable DMA Controller manufactured by Harris Corporation. It serves as an enhanced version of the industry standard 8237A Direct Memory Access controller, fabricated using advanced 2-micron CMOS process technology. The device is pin-compatible with NMOS designs and offers increased functionality, improved performance, and significantly reduced power consumption compared to its predecessors. Key electrical parameters include a maximum clock frequency of 8 MHz and support for a 16-bit address bus width. The component features four DMA channels and an 8-bit external data bus width. It operates within a commercial temperature range and utilizes a DIP40 package form factor.

Specialized Feature Summary

• Enhanced Direct Memory Access (DMA) controller functionality compatible with industry standard 8237A specifications
• Fully static design architecture permitting gated clock operation for optimized power reduction
• Supports memory-to-memory transfer capabilities alongside direct peripheral-to-memory data movement
• Includes memory block initialization feature for efficient system setup and data management

Specialized Applications

• Data transfer between external devices and system memory in microcomputer systems
• Integration with 80C286, 80286, 80186, 80C86, 8086, 80C88, 8088, 8085, Z80, and NSC800 processor buses
• High-performance embedded systems requiring low-power DMA operations

Specialized Procurement Notes

Verify the specific manufacturer source, as Harris Corporation's semiconductor assets were acquired by other entities such as Intersil and subsequently Renesas. Confirm the availability of the CS82C237-12 variant specifically, noting that CD82C37A is the documented equivalent in public databases. Check for moisture sensitivity level (MSL 3) requirements during storage and handling. Ensure compliance with export control classifications if applicable to your region.

Specialized Selection Notes

Select this component when a pin-compatible replacement for NMOS 8237A controllers is required with lower power consumption. The 8 MHz maximum clock speed suits applications not demanding higher throughput. Verify that the 16-bit address bus width meets the memory addressing requirements of the target system. Consider the DIP40 package constraints for PCB layout and socket compatibility during the design phase.

Specialized Part Context

The CS82C237-12 belongs to the Harris 82C37 family of programmable DMA controllers. This series represents the CMOS evolution of the classic Intel 8237A, offering superior noise immunity and power efficiency. The 'CS' prefix typically denotes the ceramic or specific commercial grade variant within Harris's lineup, while the '-12' suffix indicates the speed grade. These components were critical in 1980s and early 1990s computing architectures.

Specialized Replacement Considerations

The CD82C37A is the primary documented substitute within the Harris ecosystem, offering identical functionality and pinout. Other generic 82C37A-compatible CMOS controllers from manufacturers like National Semiconductor or Texas Instruments may serve as functional replacements if pin compatibility and timing specifications are verified against the original design requirements.