SCC2681AC1A44,512

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The NXP USA Inc. SCC2681AC1A44,512 is a dual asynchronous receiver/transmitter (DUART) manufactured by Philips Semiconductors 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, selectable parity, and 1, 1.5, or 2 stop bits. Each channel features independently programmable baud rates selectable from 22 fixed rates ranging from 50 to 115.2 kbaud, or derived from a 16-bit counter/timer or external clock inputs. The maximum data transfer rate reaches 1 MB/sec using a 1x clock or 125 kB/sec using a 16x clock. It operates on a single +5 V power supply and includes quadruple buffered receiver registers, a multipurpose 7-bit input port, and an 8-bit output port.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Dual full-duplex asynchronous receiver/transmitter channels with independent programming capabilities
• Quadruple buffered receiver data registers to minimize over-run potential and interrupt overhead
• Programmable baud rate generator supporting 22 fixed rates up to 115.2 kbaud plus custom rates via counter/timer
• Integrated multipurpose 7-bit input port with change-of-state detection and 8-bit output port with individual bit control

UARTs (Universal Asynchronous Receiver Transmitter) Applications

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

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix A44 corresponds to the PLCC44 package variant when sourcing components. Confirm that the commercial temperature range of 0 °C to +70 °C aligns with your system requirements. Ensure compatibility with the +5 V ± 5% supply voltage specification during integration planning.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component for designs requiring two independent UART channels without external logic. Consider the PLCC44 package constraints if space is limited. Evaluate the need for industrial temperature ranges, which require the AE1 suffix variant instead of the AC1 version used here.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This device belongs to the SCC2681 family of dual universal asynchronous receiver/transmitters originally produced by Philips Semiconductors. It serves as a legacy interface solution for embedded systems requiring robust serial communication capabilities. The part represents a standard MOS-LSI implementation designed for direct CPU interfacing.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

SCC2681AE1A44 is a verified industrial temperature variant of the same functional device. Other pin-compatible alternatives may exist but require verification against specific timing and electrical characteristics.