SCC68681C1A44,512

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The NXP SCC68681C1A44,512 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, internal counters, or external clocks. The component includes a 16-bit programmable counter/timer, parity/framing error detection, false start bit detection, and multi-function I/O ports.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Dual full-duplex asynchronous receiver/transmitter channels with independent programming capabilities
• Quadruple buffered receiver data registers to reduce interrupt overhead and prevent data loss
• Programmable data formats including 5 to 8 data bits, configurable parity, and variable stop bits
• Integrated multipurpose 6-bit input port and 8-bit output port with change-of-state detection

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 modes
• Embedded systems interfacing with S68000 family devices

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix for temperature range and package configuration. The C1 suffix indicates commercial grade operation between 0 °C and +70 °C. Confirm availability status as legacy components may be discontinued. Ensure the PLCC-44 package variant matches the target PCB footprint requirements before finalizing procurement orders.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when dual independent UART channels are required in a single package. Verify that the system requires S68000 bus compatibility or standard parallel CPU interfaces. Consider the quadruple buffering feature if interrupt latency is a critical design constraint. Ensure the application voltage aligns with the specified +5 V supply requirement.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This part belongs to the Philips/NXP SCC68681 DUART family. It is functionally compatible with other S68000 family peripherals. The device serves as a bridge between parallel microprocessor buses and serial asynchronous communication lines. It replaces older discrete UART implementations by integrating timing, control, and I/O functions into one MOS-LSI chip.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

SCN68681E1A44 is a documented replacement part number for the industrial temperature range variant of this component.