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Product Detailed Parameters
- Description：8251A - SERIAL I/O CONTROLLER, 2
- 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 MD8251A/B is a serial input/output controller manufactured by Rochester Electronics, LLC. It functions as a Universal Asynchronous Receiver/Transmitter (UART) channel within the 8251A architecture. The component utilizes HMOS technology and is housed in a CDIP28 package. It supports two channels with a data rate of 0.078125 MBps. The device operates using a fixed internal clock division scheme derived from a 1.8432 MHz crystal, limiting baud rates to discrete multiples.
Feature Summary
- Provides serial I/O control functionality compatible with standard 8251A specifications
- Integrates dual-channel operation for asynchronous communication tasks
- Ensures stable performance aligned with original OEM semiconductor standards
Applications
- Embedded communication systems requiring serial data transfer
- Legacy interface integration in industrial control hardware
- Replacement components for existing 8251A-based designs
Procurement Notes
Verify part authenticity through official manufacturer documentation or authorized distributors. Confirm that the received units match the specified HMOS process and CDIP28 package type. Ensure compatibility with system requirements regarding the fixed internal clock division scheme and 1.8432 MHz crystal dependency before finalizing procurement orders.
Selection Notes
Select this component when maintaining legacy systems requiring exact 8251A functional equivalence. Consider the constraint of discrete baud rate multiples derived from the 1.8432 MHz crystal source. Verify that the HMOS technology and CDIP28 form factor align with existing board layouts and thermal management strategies for the target application environment.
Part Context
Rochester Electronics specializes in sourcing and distributing obsolete and hard-to-find semiconductors. The MD8251A/B represents a continuation of support for the classic Intel 8251A UART architecture. This product ensures availability for manufacturers maintaining older equipment without redesigning core communication interfaces.
Replacement Considerations
Direct substitutes include other 8251A-compatible UART controllers from various manufacturers. Verify pinout compatibility and electrical characteristics against the original design specifications to ensure seamless integration into existing serial communication circuits.
