SC28L194A1A,518

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SC28L194A1A,518 is a quad Universal Asynchronous Receiver/Transmitter (QUART) designed for 3.3 V and 5.0 V supply voltages. It integrates four independent full-duplex UART channels, each equipped with 16-byte receive and transmit FIFOs to minimize overrun and interrupt overhead. The device supports a synchronous host interface with a system clock up to 33 MHz and features an on-chip crystal oscillator for frequencies between 2 and 8 MHz. Baud rates are selectable from 22 fixed options ranging from 50 to 230.4 kbaud, or via programmable counters for non-standard rates up to 500 kbaud. It includes automatic in-band flow control using Xon/Xoff characters and address recognition in multi-drop mode.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Four independent full-duplex UART channels with 16-byte FIFOs for both reception and transmission.
• Synchronous host interface supporting burst mode access with fast data bus release times.
• Integrated baud rate generator providing 22 standard rates plus programmable counters for custom speeds.
• Automatic in-band flow control using user-defined Xon/Xoff characters and hardware handshaking.
• Advanced interrupt arbitration system that identifies the highest priority pending interrupt source.

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Statistical multiplexers and data concentrators
• Terminal servers and computer-printer links
• Process control and building automation systems
• ISDN front ends and packet-switching networks

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix against the manufacturer's current product data sheet to confirm package type and temperature range. Ensure the component meets required industrial specifications for the intended operating environment. Cross-reference pin configurations with the official datasheet to validate compatibility with the target PCB layout.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when multiple asynchronous serial channels are required within a single footprint. The integrated FIFOs reduce CPU load compared to devices without buffering. Verify that the host system clock frequency meets the minimum requirement of twice the highest baud rate clock input. Consider the available package options if space constraints dictate a specific form factor.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This device belongs to the Philips/NXP QUART family of serial communication controllers. It serves as a high-density solution for applications requiring multiple UART interfaces. The architecture shares functional similarities with earlier single-channel UARTs but offers significantly improved throughput and flexibility through its quad-channel design and advanced interrupt handling capabilities.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

Direct replacements may include other quad UARTs from NXP or compatible manufacturers offering similar FIFO depths and voltage ranges. Verify pin compatibility and register mapping if software migration is planned. Ensure the substitute device supports the required baud rate generation methods and interrupt arbitration features.