SCC2681AE1A44,529

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The NXP SCC2681AE1A44,529 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 quadruple buffered receiver registers and selectable baud rates ranging from 50 to 115.2 kbps using fixed rates, a 16x clock, or external timing. It operates on a single +5 V supply and includes a multipurpose 7-bit input port and an 8-bit output port for general I/O or control functions.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Dual full-duplex asynchronous receiver/transmitter channels
• Quadruple buffered receiver data registers
• Programmable data format with parity and stop bit selection
• Multipurpose 7-bit input and 8-bit output ports

UARTs (Universal Asynchronous Receiver Transmitter) Applications

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

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix against the manufacturer's current product status documentation. Confirm that the PLCC44 package variant matches the required footprint and pin configuration for the target design. Ensure compliance with relevant environmental standards by checking the material declaration for lead content and RoHS directives prior to final procurement decisions.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when a system requires two independent serial communication channels with distinct baud rate capabilities. The device is suitable for designs needing quadruple buffering to minimize overrun errors and reduce CPU interrupt overhead. Consider the available DIP and PLCC packages based on board space constraints and assembly requirements.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This part belongs to the SCC2681 family of dual universal asynchronous receiver/transmitters originally developed by Philips Semiconductors. The AE1A44 designation specifically identifies the industrial temperature range version housed in a 44-lead plastic leaded chip carrier package. It serves as a direct replacement for legacy SCN2681 devices in existing hardware architectures.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

SCC2681AC1A44

UARTs (Universal Asynchronous Receiver Transmitter) FAQ

How does the SCC2681 handle receiver overrun?

Each receiver channel incorporates quadruple buffered data registers. This architecture minimizes the potential for receiver overrun and reduces interrupt overhead in interrupt-driven systems.

What clocking options are available for the baud rate generator?

The device can utilize 18 fixed baud rates, a 16x clock derived from a programmable counter/timer, or an external 1x or 16x clock input.

Can the input and output ports be used for general purpose I/O?

Yes, the multipurpose 7-bit input port and 8-bit output port can function as general-purpose I/O or be assigned specific functions such as clock inputs or status/interrupt outputs under program control.