SCC68681E1A44,529

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The NXP SCC68681E1A44 is a dual asynchronous receiver/transmitter (DUART) manufactured by Philips Semiconductors. It provides two independent full-duplex channels in a PLCC-44 package. The device supports data rates up to 115.2 kb/s with a maximum supply voltage of 5.5 V and operates within an industrial temperature range of -40°C to +85°C. It features quadruple buffered receivers, programmable baud rates, and a 16-bit counter/timer. The component draws 10 mA during operation and is designed for SMD/SMT mounting.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Dual full-duplex asynchronous receiver/transmitter channels
• Quadruple buffered receiver data registers
• Programmable baud rate generator and counter/timer
• Versatile interrupt system with maskable conditions

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Polled or interrupt-driven microprocessor systems
• Clustered terminal systems requiring dual-speed channels
• Multidrop communication applications

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature rating. Confirm RoHS compliance status as historical records may vary. Check current manufacturing status as this part number may be discontinued or subject to limited availability constraints.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when S68000 bus compatibility is required alongside dual serial interfaces. Ensure the design accommodates the PLCC-44 footprint and +5V power supply requirements. Verify that the industrial temperature range meets the environmental specifications of the target application.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This component belongs to the S68000 family of communications devices. It serves as a direct replacement for similar legacy UARTs in industrial control and embedded systems. The device integrates standard asynchronous communication functions with additional I/O capabilities.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

SCC68681C1N40

UARTs (Universal Asynchronous Receiver Transmitter) FAQ

What is the buffer depth of the receiver?

The receiver features a quadruple buffered FIFO stack with a capacity of three characters.

How is the baud rate generated?

The baud rate can be selected from eighteen fixed rates, derived from a programmable counter/timer, or sourced from an external clock.

What input port capabilities are provided?

It includes a multipurpose 6-bit input port with change-of-state detection on four inputs and internal pull-up resistors.