SCC2691AC1A28,518

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SCC2691AC1A28,518 is a single-chip CMOS-LSI Universal Asynchronous Receiver/Transmitter (UART) manufactured by NXP USA Inc. It provides full-duplex asynchronous communication and operates from a single +5V power supply with TTL compatibility. The device features a quadruple buffered receiver data register to minimize overrun potential and reduce interrupt overhead. Baud rates for the receiver and transmitter can be selected independently from 22 fixed rates ranging from 50 to 115.2K baud, non-standard rates up to 115.2 kb, or external clocks. It includes a programmable 16-bit counter/timer, on-chip crystal oscillator, and a low-power mode where the oscillator is frozen while register contents are stored.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Full-duplex asynchronous receiver/transmitter with independent baud rate selection
• Quadruple buffered receiver data register to minimize overrun and interrupt overhead
• Programmable 16-bit counter/timer with multiple timing sources
• On-chip crystal oscillator supporting commercial and industrial temperature ranges

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel applications
• Interrupt-driven systems needing reduced interrupt overhead
• Multi-processor communications utilizing 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. Ensure the component meets RoHS compliance requirements if applicable to your design. Cross-reference the part number with official distributors to confirm availability and authenticity before procurement.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this UART when independent receiver and transmitter speeds are required for clustered terminal applications. Consider the quadruple buffering feature for systems sensitive to interrupt latency. Verify that the available packages, such as PLCC, meet the physical space constraints of the target PCB layout.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This component belongs to the Philips/NXP Semiconductors SCC2691 family of UARTs. It supersedes earlier data specifications from September 1998. The device is fabricated using CMOS technology to combine high density with low power consumption, maintaining compatibility with standard microprocessor interfaces.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

Check the ordering information table for alternative versions within the same family, such as the SCC2691AE1A28 for industrial temperature ranges. Verify pinout compatibility if substituting with other UART models in the SCC series.