P8251A

Overview

The P8251A is a programmable communication interface integrated circuit manufactured by Advanced Micro Devices. It is housed in a 28-pin DIP package and functions as a serial I/O controller with one channel. The device supports data rates up to 0.0078125 MBps using MOS technology. It serves as a universal synchronous/asynchronous receiver/transmitter (USART) for interfacing microprocessors with peripheral devices.

Feature Summary

• Programmable communication interface architecture
• Universal synchronous and asynchronous operation modes
• Direct microprocessor interfacing capability

Applications

• Microprocessor system serial communication
• Peripheral device data transmission
• Industrial control system interfaces

Procurement Notes

Verify the manufacturer marking matches Advanced Micro Devices specifications. Confirm the 28-pin DIP package integrity and pin configuration. Check for RoHS compliance status as historical units may not meet current environmental standards. Ensure the component is free from physical damage or corrosion on contact pins before integration into new designs.

Selection Notes

Select this component when a dedicated USART is required for legacy microprocessor systems. It provides a standardized solution for serial data exchange between CPUs and external peripherals. Consider availability of compatible replacement parts if sourcing new production runs is necessary due to its vintage status.

Part Context

This part belongs to the family of programmable communication interfaces developed by Advanced Micro Devices. It shares functional similarities with industry-standard USARTs like the Intel 8251A, offering reliable serial data handling for embedded applications requiring robust synchronous and asynchronous communication protocols.

Replacement Considerations

Compatible substitutes include the Intel 8251A and other generic USART equivalents. Verify pin compatibility and electrical characteristics before substitution.