SCC68681C1A44,518

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The NXP SCC68681C1A44,518 is a Dual Universal Asynchronous Receiver/Transmitter (DUART) manufactured using CMOS technology. It integrates two independent full-duplex asynchronous channels within a PLCC-44 package. The device supports S68000 bus compatibility and operates on a single +5 V power supply. Each channel features quadruple buffered receiver data registers to minimize overrun errors. Programmable baud rates range from 50 to 115.2 kbaud, selectable via fixed rates, an internal counter/timer, or external clocks. The component includes a 16-bit programmable counter/timer, multi-function I/O ports, and comprehensive error detection capabilities.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Dual full-duplex asynchronous receiver/transmitter channels with independent programming
• Quadruple buffered receiver data registers for reduced interrupt overhead
• Programmable data formats including variable data bits, parity options, and stop bits
• Integrated 16-bit programmable counter/timer and versatile interrupt system

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Polled or interrupt-driven microprocessor communication systems
• Clustered terminal systems requiring dual-speed channel applications
• Multidrop serial communication networks utilizing automatic wake-up mode
• Embedded systems interfacing with S68000 family devices

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific suffix '518' against official documentation to confirm packaging details and environmental compliance status. Confirm availability as this component may be discontinued or subject to limited supply constraints. Ensure the operating temperature range matches the commercial specification (0 °C to +70 °C). Cross-reference pin configurations with the PLCC-44 datasheet before integration.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when dual independent asynchronous channels are required in a single package. It is suitable for designs needing S68000 bus compatibility or flexible baud rate generation via internal counters. Consider the PLCC-44 surface mount package for space-constrained PCB layouts. Verify that the required temperature range aligns with the commercial grade specifications provided in the ordering information.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This part belongs to the Philips/NXP SCC68681 DUART family, designed for high-performance serial communications. It serves as a bridge between parallel microprocessor buses and serial data streams. The device replaces older discrete UART solutions by integrating timing, control, and I/O functions into one MOS-LSI chip, simplifying system architecture for legacy and modern embedded controllers.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

SCN68681E1A44: Industrial temperature variant in PLCC-44 package. SCC68681C1N40: Commercial temperature variant in DIP-40 package. SCN68681E1N40: Industrial temperature variant in DIP-40 package.