TD8259A-2

Specialized Overview

The TD8259A-2 is an interrupt controller manufactured by Rochester Electronics, LLC. It is compatible with IAPX 88, IAPX 86, MCS-85, and MCS-80 bus architectures. The device utilizes NMOS technology and is housed in a CDIP28 or DIP-28 package. It features an 8-bit external data bus width and supports eight external interrupt sources. The component operates within a supply voltage range of 4.5 V to 5.5 V, with a nominal voltage of 5 V. The operating temperature range extends from -40 °C to 85 °C. The package dimensions include a length of 37.15 mm and a maximum seated height of 5.72 mm.

Specialized Feature Summary

• Compatible with IAPX 88, IAPX 86, MCS-85, and MCS-80 bus standards
• Supports eight external interrupt devices
• NMOS technology construction
• Ceramic glass-sealed dual in-line package

Specialized Applications

• IAPX 88 system integration
• IAPX 86 system integration
• MCS-85 microcontroller systems
• MCS-80 microcontroller systems

Specialized Procurement Notes

Verify the specific suffix designation when ordering, as it may indicate package variations or testing criteria. Confirm that the ceramic DIP-28 form factor meets mechanical constraints. Ensure compatibility with existing 5V logic levels and bus timing requirements for the target IAPX or MCS architecture before procurement.

Specialized Selection Notes

Select this component for legacy systems requiring direct compatibility with Intel 8086/88 or 8085/8080 interrupt structures. Consider the through-hole DIP-28 package for prototyping or replacement in older equipment. Verify thermal management capabilities within the specified -40 °C to 85 °C operational range for the intended environment.

Specialized Part Context

Rochester Electronics specializes in the sourcing and distribution of obsolete and hard-to-find semiconductor components. The TD8259A-2 represents a continuation of support for legacy interrupt controllers originally designed for early personal computer and industrial control architectures based on Intel's 16-bit and 8-bit processors.

Specialized Replacement Considerations

The TD8259A is functionally equivalent to the Intel 8259A PIC. When replacing, ensure the substitute part matches the pinout and electrical characteristics of the original design. Verify that any alternative interrupt controller maintains compatibility with the specific bus protocol (IAPX/MCS) used in the system.