COM2651BI-P

Application Specific Microcontrollers Overview

The COM2651BI-P is a high-performance, single-chip Universal Asynchronous Receiver/Transmitter (UART) manufactured by SMSC. It integrates two independent UART channels with full hardware flow control and supports baud rates up to 3 Mbps. The device features a 16-byte transmit and receive FIFO buffer for each channel to minimize CPU overhead. It operates on a single 3.3V power supply and includes an integrated clock generator capable of producing standard baud rate clocks from various input frequencies. The component utilizes a 48-pin TQFP package and is designed for applications requiring reliable serial communication in embedded systems.

Application Specific Microcontrollers Feature Summary

• Integrates two fully independent UART channels with complete hardware flow control support
• Includes 16-byte transmit and receive FIFO buffers per channel to reduce processor intervention
• Features an internal clock generator that synthesizes standard baud rates from diverse input frequencies
• Supports operation at baud rates up to 3 Mbps for high-speed data transmission

Application Specific Microcontrollers Applications

• Industrial automation controllers requiring dual serial interfaces
• Embedded computer systems needing reliable asynchronous communication
• Telecommunications equipment utilizing high-speed serial data links

Application Specific Microcontrollers Procurement Notes

Verify the specific suffix 'BI' against the manufacturer's official datasheet to confirm pinout compatibility and voltage levels. Ensure the 48-pin TQFP package matches your PCB footprint design. Cross-reference the operating temperature range with your system requirements before finalizing procurement decisions.

Application Specific Microcontrollers Selection Notes

Select this component when dual UART functionality is required within a single IC to save board space. Consider its 3.3V operation if your system logic does not support higher voltages. Evaluate the 16-byte FIFO depth against your interrupt handling capabilities to ensure optimal throughput without data loss during high-baud-rate operations.

Application Specific Microcontrollers Part Context

SMSC, now part of Microchip Technology, produced this UART as part of their peripheral interface portfolio. The COM2651 series was widely adopted in the late 1990s and early 2000s for PC peripherals and industrial devices. This specific model represents a mature technology solution for legacy system maintenance and retro-computing projects where original hardware compatibility is essential.

Application Specific Microcontrollers Replacement Considerations

Check for direct replacements such as the COM2651AI or COM2651CI which may differ only in temperature grade or packaging. Modern alternatives like the ST16C2652 or NXP SC16IS752 offer similar functionality but may require software adaptation due to register differences.