SCC2691AC1A28,623

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SCC2691AC1A28,623 is a single-chip CMOS-LSI Universal Asynchronous Receiver/Transmitter (UART) manufactured by NXP USA Inc. It provides full-duplex asynchronous communication and operates from a single +5V power supply with TTL-compatible inputs and outputs. The device features a quadruple buffered receiver data register to minimize overrun potential and reduce interrupt overhead. Baud rates for the receiver and transmitter can be selected independently from 22 fixed rates ranging from 50 to 115.2K baud, or derived from an external clock or programmable counter/timer. The component supports programmable data formats including 5 to 8 data bits, parity options, and 1, 1.5, or 2 stop bits.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Full-duplex asynchronous receiver/transmitter with independent speed selection
• Quadruple buffered receiver data register to minimize overrun
• Programmable data format supporting 5 to 8 data bits plus parity
• On-chip crystal oscillator and low power mode

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channels
• Interrupt-driven systems needing reduced interrupt overhead
• Multi-processor communications utilizing address frame recognition

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Ensure compatibility with the required voltage levels and interface standards before integration into the design.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this UART when independent baud rate control for receive and transmit paths is necessary. Consider the quadruple buffering feature for applications prone to high data throughput or where minimizing CPU interrupt latency is critical for system stability.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This component belongs to the SCC2691 family of universal asynchronous receiver/transmitters. It is designed as a CMOS-LSI device offering high density and low power consumption compared to older technologies. The device supersedes earlier data specifications from September 1998.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

Check the ordering information table in the datasheet for alternative versions such as the SCC2691AE1A28 for industrial temperature ranges or different package types like the 24-pin DIP or SOL variants.