COM92C451P

Overview

The COM92C451P is a CMOS Single-Chip Universal Asynchronous Receiver/Transmitter (UART) manufactured by SMSC. It provides two independent asynchronous serial communication channels, supporting data rates up to 230.4 kbps with an internal baud rate generator. The device integrates 16-byte transmit and receive FIFOs to enhance throughput and reduce CPU overhead. It features full hardware flow control support via RTS/CTS signals and supports standard RS-232 and RS-485 interfaces. The component operates on a single 5V supply and includes interrupt capabilities for efficient system integration.

Feature Summary

• Dual-channel architecture providing two independent UART interfaces within a single package
• Integrated 16-byte FIFO buffers for both transmission and reception to minimize processor intervention
• Hardware flow control implementation supporting automatic management of data transfer timing
• Programmable baud rate generation compatible with standard asynchronous serial protocols

Applications

• Industrial automation systems requiring multi-port serial connectivity
• Embedded controllers managing external modems or GPS modules
• Point-of-sale terminals utilizing RS-232 peripheral connections
• Data acquisition systems interfacing with sensor networks

Procurement Notes

Verify the manufacturer origin as SMSC or its successor entities, noting that Microchip Technology acquired SMSC assets. Confirm the specific suffix indicates the correct package type and temperature range. Ensure compliance with current RoHS directives if required for the target assembly process. Cross-reference the part number against official Microchip databases to confirm availability status and revision history before finalizing procurement orders.

Selection Notes

Select this component when dual independent serial ports are required in a space-constrained design. Evaluate the 16-byte FIFO depth against application latency requirements to determine if higher buffer capacities are necessary. Consider the operating voltage compatibility with the host microcontroller logic levels. Verify that the maximum baud rate meets the synchronization needs of the connected peripheral devices.

Part Context

This component belongs to the COM92 series of UART controllers designed for high-performance serial communication. It serves as a bridge between parallel bus architectures and asynchronous serial data streams. The device is commonly used in legacy and modern embedded systems where reliable serial data exchange is critical. Its pin-compatible variants offer flexibility in board layout and thermal management strategies.

Replacement Considerations

Public confirmed substitute part numbers include the MAX3232 for level shifting applications or other dual-UART controllers from manufacturers like NXP or STMicroelectronics. Verify pinout compatibility and register set similarities to ensure seamless integration without extensive firmware modifications.