MD8259A/BXA

Specialized Overview

The MD8259A/BXA is a Direct Memory Access (DMA) controller manufactured by Rochester Electronics, LLC. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an external data bus width of 8 bits. The component is designed for compatibility with IAPX 88, IAPX 86, MCS-85, and MCS-80 processor architectures. It features eight external interrupt devices and utilizes a 28-pin Dual In-line Package (DIP). The device functions reliably across a temperature range of -40 °C to 105 °C.

Specialized Feature Summary

• Provides direct memory access control for system data transfer operations
• Compatible with legacy Intel microprocessor families including MCS-80 and MCS-85
• Supports eight independent external interrupt request lines

Specialized Applications

• Legacy computer system maintenance and repair
• Industrial control systems utilizing vintage microprocessors
• Embedded applications requiring DMA functionality in older architectures

Specialized Procurement Notes

Verify the specific package variant and suffix designation when ordering, as Rochester Electronics supplies continuing source components that may differ from original manufacturer specifications. Confirm lead times and availability directly with authorized distributors, as these parts are often subject to lifecycle constraints. Ensure the received unit matches the required pinout and electrical characteristics for your specific application design.

Specialized Selection Notes

Select this component only if your design requires a DMA controller compatible with IAPX 86 or MCS-80 buses. Verify that the 28-pin DIP package fits your PCB layout constraints. Consider the operating temperature range requirements, as the specified range extends to 105 °C. Ensure the 5 V logic levels align with your system's voltage domains before integration.

Specialized Part Context

Rochester Electronics specializes in providing authorized continuing source solutions for end-of-life and obsolete semiconductors. This part represents a continuation of production for legacy components no longer manufactured by original equipment manufacturers. It serves critical markets where redesigning systems is not feasible due to cost or complexity constraints.

Specialized Replacement Considerations

No public confirmed substitute part numbers are available for this specific component. As a specialized continuing source product, direct replacements may require adapter solutions or system modifications to accommodate different pinouts or electrical characteristics.