SC28C94A1A,518

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SC28C94A1A,518 is a Quad Universal Asynchronous Receiver/Transmitter (QUART) integrated circuit manufactured by NXP Semiconductors. It integrates four independent UART channels within a single 52-pin PLCC package. The device operates on a single +5V power supply and utilizes high-speed CMOS technology to minimize die size and power consumption. Each channel features an eight-byte receive FIFO and an eight-byte transmit FIFO to reduce host processor interrupt overhead. Baud rates are independently selectable for each receiver and transmitter from eighteen fixed rates ranging from 50 baud to 38.4K baud, or up to 230.4K baud with specific clock configurations. Programmable counter/timers support user-defined baud rates up to 1.0 M baud.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Integrates four industry-standard UARTs with dedicated interrupt control logic to minimize host processor overhead
• Provides eight-byte receive and transmit FIFOs per channel to prevent overrun and reduce interrupt frequency
• Supports programmable data formats including 5 to 8 data bits, parity options, and 1, 1.5, or 2 stop bits
• Includes built-in baud rate generator with 18 standard rates and two multifunction 16-bit counter/timers

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel communication
• Industrial motor drives and robotics utilizing serial communication protocols
• Multi-motor platforms with real-time diagnostics and scalable architectures

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm the ordering suffix matches the required environmental specifications, such as lead-free status and RoHS compliance. Review the material declaration for halogen-free requirements and REACH SVHC status prior to integration into production designs.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this QUART variant when designing systems requiring multiple asynchronous serial interfaces within a compact footprint. Ensure the host microprocessor supports the necessary address decoding and interrupt handling schemes. Verify that the system clock frequency aligns with the available baud rate generator options to meet timing accuracy requirements.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This component belongs to the SC28C94 family of quad universal asynchronous receivers/transmitters. It represents an evolution of Philips Semiconductors' industry-standard UART architecture, optimized for low power consumption and reduced interrupt latency in embedded applications.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

SC28C94A1A,112: Identical functional specification but non-lead-free and non-RoHS compliant.

UARTs (Universal Asynchronous Receiver Transmitter) FAQ

How does the SC28C94A1A handle interrupt prioritization?

The device implements hardware-supported interrupt priority arbitration based on factors such as FIFO byte counts, counter/timer events, change-of-state detections, break conditions, and receiver errors.

What is the function of the power-down mode?

The power-down mode stops the internal oscillator and stores register contents, resulting in significantly reduced power consumption while maintaining state information.

Can the receiver and transmitter operate at different baud rates?

Yes, the operating speed of the receiver and transmitter can be selected independently from the baud rate generator, counter/timer, or external clock sources.