SCC2691AC1D24,518

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The NXP USA Inc. SCC2691AC1D24,518 is a Universal Asynchronous Receiver/Transmitter (UART) fabricated with CMOS technology. It provides full-duplex asynchronous communication and operates from a single +5V power supply. The device features a quadruple buffered receiver to minimize overrun potential and supports independent baud rate selection for the receiver and transmitter. These rates can be derived from 18 fixed options ranging from 50 to 115.2K baud, a programmable counter/timer, or external clocks. The component includes an on-chip crystal oscillator, a 16-bit programmable counter/timer, and multiple channel modes including normal, echo, and loopback configurations.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Full-duplex asynchronous receiver/transmitter with quadruple buffered receiver data register
• Programmable data format supporting 5 to 8 data bits plus parity and 1, 1.5, or 2 stop bits
• Independent baud rate selection for receiver and transmitter via fixed rates, internal timer, or external clock
• Multi-function programmable 16-bit counter/timer with selectable timing sources

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel applications
• Interrupt-driven systems minimizing receiver overrun and interrupt overhead
• Multi-processor communications utilizing automatic wake-up through address frame recognition

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature range. The 'D24' designation corresponds to the 24-Pin Plastic Small Outline Large (SOL) package. Ensure the 'A' prefix indicates the commercial temperature version (0°C to +70°C). Cross-reference the datasheet revision date to ensure compatibility with current design specifications.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this UART when independent baud rate control for transmit and receive channels is required. The device is suitable for applications needing a quadruple buffered receiver to handle high data throughput without overrun errors. Consider the integrated crystal oscillator and programmable counter/timer if external timing components are undesirable. Verify that the system voltage aligns with the single +5V supply requirement and TTL compatibility.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

The SCC2691 is part of the Philips Semiconductors (now NXP) UART family, superseding earlier versions from 1998. It utilizes CMOS-LSI technology to combine high density with low power consumption. The device is designed for robust serial communication in microprocessor-based systems, offering extensive programmability for data formats and timing configurations compared to standard UART implementations.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

Public confirmed substitute part numbers include the SCC2692, which offers similar functionality within the same product family.