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Product Detailed Parameters
- Description：SERIAL I/O CONTROLLER, 1 CHANNEL
- Series：*
- Mfr：Rochester Electronics, LLC
- Package：Bulk
- Features：-
- Number of Channels：-
- FIFO's：-
- Protocol：-
- Data Rate (Max)：-
- Voltage - Supply：-
- With Auto Flow Control：-
- With IrDA Encoder/Decoder：-
- With False Start Bit Detection：-
- With Modem Control：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The D8251A is a serial I/O controller manufactured by Rochester Electronics, LLC. It functions as a Universal Synchronous/Asynchronous Receiver/Transmitter (USART) designed for data communications with microprocessors. The component supports one channel and utilizes HMOS technology. It is housed in a CDIP28 package, providing a programmable communication interface suitable for peripheral integration in legacy computing systems.
Feature Summary
- Universal synchronous and asynchronous receiver/transmitter functionality
- Programmable communication interface for microprocessor integration
- Single-channel serial I/O control capability
Applications
- Microprocessor-based data communication systems
- Legacy computer peripheral interfaces
- Industrial control system serial ports
Procurement Notes
Verify the specific manufacturing lot and date code upon receipt to ensure compatibility with target system requirements. Confirm that the CDIP28 package condition meets operational standards. Cross-reference the part number with official Rochester Electronics documentation to validate authenticity and functional specifications before integration into final assemblies.
Selection Notes
Select this component when a single-channel USART is required for microprocessor interfacing. The HMOS process technology defines its electrical characteristics. Ensure the application environment supports the DIP package form factor. This part serves as a direct replacement for original 8251A designs requiring extended lifecycle support from authorized distributors.
Part Context
Rochester Electronics provides lifecycle management for discontinued semiconductor products. The D8251A represents a continuation of the industry-standard 8251A USART architecture. It maintains pinout and functional compatibility with original designs while offering supply assurance for systems no longer supported by the original OEM.
Replacement Considerations
The P8251A-G is listed as a related serial I/O controller variant. Verify pin compatibility and voltage levels before substitution. MD8251A indicates a dual-channel configuration, which differs functionally from the single-channel D8251A.
