SCC2691AC1D24,512

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The NXP USA Inc. SCC2691AC1D24,512 is a Universal Asynchronous Receiver/Transmitter (UART) fabricated using CMOS-LSI technology in a 24-pin Plastic Small Outline Large (SOL) package. It provides full-duplex asynchronous communication with an operating speed selectable from 22 fixed baud rates ranging from 50 to 115.2K baud, non-standard rates up to 115.2 kb/s derived from a programmable 16-bit counter/timer, or external 1X/16X clocks. The device features a quadruple buffered receiver data register and operates on a single +5V power supply with commercial temperature ratings of 0°C to +70°C.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Full-duplex asynchronous receiver/transmitter with independent baud rate selection for receiver and transmitter channels
• Quadruple buffered receiver data register designed to minimize overrun potential and reduce interrupt overhead
• Programmable data format supporting 5 to 8 data bits plus parity, odd/even/no/force parity, and 1, 1.5, or 2 stop bits
• Integrated multi-function 16-bit counter/timer capable of generating internal clocks or serving as a general-purpose timer

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel applications
• Interrupt-driven serial communication systems utilizing maskable interrupt conditions
• Multi-processor communications employing automatic wake-up via address frame recognition

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer, as availability may vary by region and production lifecycle stage.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when independent baud rate control for receive and transmit paths is required. Ensure the design accommodates the 24-pin SOL package dimensions and utilizes a +5V power supply. Verify that the system clock requirements align with the supported crystal frequencies or external clock inputs specified in the electrical characteristics.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This UART belongs to the SCC2691 family, which includes variants such as the SCC2691AC1N24 (DIP) and SCC2691AC1A28 (PLCC). These devices share identical functional specifications but differ in physical packaging and thermal characteristics. The AC1 designation typically indicates the commercial temperature grade suitable for standard industrial environments.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

Compatible substitutes include the SCC2691AC1N24 and SCC2691AC1A28 for different package requirements. Cross-reference with the SCN2681 or SCC68681 families for pin-compatible alternatives, ensuring voltage levels and timing parameters match the existing design constraints.