SCC2681AC1N40,112

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The NXP SCC2681AC1N40,112 is a dual asynchronous receiver/transmitter (DUART) manufactured in a CMOS process. It provides two independent full-duplex channels within a single package, interfacing directly with microprocessors via an 8-bit bidirectional data bus. The device supports programmable data formats including 5 to 8 data bits, parity options, and 1, 1.5, or 2 stop bits. Each channel features independently selectable baud rates from 22 fixed options ranging from 50 to 115.2 kbps, or derived from a 16-bit counter/timer or external clock. The component includes quadruple buffered receiver registers, a multipurpose 7-bit input port, and an 8-bit output port. It operates on a single +5 V supply and is housed in a 40-pin DIP package suitable for commercial temperature ranges.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Dual full-duplex asynchronous communication channels with independent programming capabilities
• Quadruple buffered receiver data registers to minimize overrun and interrupt overhead
• Integrated 16-bit programmable counter/timer supporting multiple baud rate generation modes
• Versatile interrupt system with maskable conditions and configurable open-drain outputs

UARTs (Universal Asynchronous Receiver Transmitter) Applications

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

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix against current manufacturer documentation to confirm package type and temperature range. Ensure compatibility with existing PCB footprints for the 40-pin DIP configuration. Confirm that the commercial temperature rating aligns with the operational environment requirements of the target design.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when dual independent UART channels are required within a single integrated circuit. Consider the availability of internal pull-ups on the input port and the flexibility of the programmable baud rate generator. Evaluate the interrupt architecture to ensure it meets the system's latency and masking requirements without excessive CPU intervention.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This device belongs to the SCC2681 family of dual universal asynchronous receiver/transmitters. It serves as a direct replacement for legacy synchronous controllers like the SCN2681 in many designs. The family offers variations in package styles including PLCC and 28-pin DIP, alongside industrial temperature grade options for broader environmental adaptability.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

Publicly confirmed substitute part numbers include the SCC2681AE1N40 for industrial temperature range applications and the SCC2681AC1A44 for PLCC package integration. Verify pinout compatibility before substitution.