SCC2681AC1A44,518

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The NXP SCC2681AC1A44,518 is a Dual Universal Asynchronous Receiver/Transmitter (DUART) manufactured in a CMOS process. It provides two independent full-duplex asynchronous channels within a single package, interfacing directly with microprocessors for polled or interrupt-driven systems. The device operates on a single +5 V power supply and supports commercial temperature ranges from 0 °C to +70 °C. Each channel features quadruple buffered receiver data registers and programmable baud rates selectable from 18 fixed rates up to 115.2 k baud, or derived from an external clock or internal counter/timer. It includes a 16-bit programmable counter/timer, parity/framing error detection, and versatile interrupt capabilities.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Dual full-duplex asynchronous receiver/transmitter channels with quadruple buffered receiver data registers
• Programmable data format supporting 5 to 8 data bits plus parity and 1, 1.5, or 2 stop bits
• Versatile interrupt system with a single INTRN output and configurable wire-ORable interrupt outputs via the output port
• Multipurpose 7-bit input port with change-of-state detection and multipurpose 8-bit output port

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel applications
• Polled or interrupt-driven microprocessor communication systems
• Multidrop applications utilizing automatic wake-up mode

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix '518' against official Philips/NXP documentation to confirm manufacturing origin and compliance details. Confirm that the commercial temperature range of 0 °C to +70 °C meets the operational requirements of the target environment. Ensure the PLCC44 package variant aligns with the PCB footprint design constraints.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when dual independent asynchronous channels are required within a single integrated circuit. Consider the quadruple buffering for reducing interrupt overhead in high-throughput systems. Verify compatibility with the host microprocessor's address bus width and timing requirements, specifically the setup and hold times for RDN and WRN signals.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

The SCC2681AC1A44,518 belongs to the SCC2681 family of Dual Universal Asynchronous Receiver/Transmitters. This series is designed to replace older discrete UART solutions by integrating two complete channels, a baud rate generator, and general-purpose I/O ports into one MOS-LSI device. It serves as a direct interface between microprocessors and serial peripheral devices.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

SCC2681AE1A44: Industrial temperature grade (-40 °C to +85 °C) version of the same PLCC44 package.