SCC68692C1A44,518

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SCC68692C1A44,518 is a dual asynchronous receiver/transmitter (DUART) manufactured by NXP Semiconductors. It provides two full-duplex asynchronous channels in a single package and is compatible with the S68000 bus architecture. The device operates on a single +5 V power supply within a commercial temperature range of 0 to +70 °C. Key electrical parameters include a maximum data transfer rate of 1 MB/sec at 1X clocking or 125 kB/sec at 16X clocking. It features quadruple buffered receiver data registers, programmable baud rates up to 115.2 kbaud, and an integrated crystal oscillator.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• S68000 bus compatible interface for seamless integration with microprocessors
• Dual full-duplex asynchronous receiver/transmitters with independent channel programming
• Quadruple buffered receiver data register to minimize over-run potential
• Programmable baud rate generator supporting fixed rates and external clocks

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel applications
• Interrupt-driven or polled serial communication systems
• Multidrop applications utilizing automatic wake-up mode

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify component authenticity through authorized distributors or official manufacturer channels. Confirm that the specific ordering suffix matches the required temperature grade and package type. Ensure compliance with RoHS directives if applicable to your region. Request original datasheets to validate technical specifications against current revisions before finalizing procurement decisions.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when interfacing with S68000 family devices or standard microprocessors requiring dual UART functionality. Ensure the system design accommodates the PLCC-44 package dimensions and pinout configuration. Verify that the application environment remains within the specified commercial temperature limits of 0 to +70 °C. Confirm power supply stability at +5 V ± 10% to maintain reliable operation.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This part belongs to the Philips/NXP SCC68692 series of dual universal asynchronous receiver/transmitters. It serves as a CMOS-LSI communications device designed to provide robust serial I/O capabilities. The device supersedes earlier versions from September 1998 and maintains compatibility with legacy S68000 architectures while offering enhanced buffering and interrupt management features.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

SCC68692E1A44: Industrial temperature version (-40 to +85 °C).

UARTs (Universal Asynchronous Receiver Transmitter) FAQ

How does the DUART handle receiver buffer overflow?

The device utilizes a quadruple buffered receiver data register to minimize the potential of receiver over-run and reduce interrupt overhead in interrupt-driven systems.

What clock options are available for the baud rate generator?

The baud rate generator can operate from an internal crystal connected to X1/CLK and X2, or accept external 1X or 16X clock inputs via the IP pins.

Can the operating speed of the receiver and transmitter be different?

Yes, each receiver and transmitter can independently select its operating speed from eighteen fixed baud rates, a programmable counter/timer derived clock, or an external clock.