SC28C94A1A,512

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SC28C94A1A is a Quad Universal Asynchronous Receiver/Transmitter (QUART) integrated circuit manufactured by NXP USA Inc. It integrates four independent UART channels within a single 52-pin PLCC package, designed for high-speed CMOS applications requiring low power consumption and minimal host processor overhead. The device operates on a single +5V supply and supports industrial temperature ranges from -40°C to +85°C. Each channel features an 8-byte receive FIFO and an 8-byte transmit FIFO to manage data flow efficiently. Baud rates are selectable via 18 fixed internal rates, programmable counter/timers, or external clocks, supporting speeds up to 1.0 M baud in specific configurations.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Integrates four industry-standard UARTs with dedicated interrupt control logic to minimize host processor overhead.
• Provides eight-character deep FIFO buffers for both receiving and transmitting data on each channel.
• Supports independent baud rate selection per channel using fixed rates, programmable counters, or external clock inputs.
• Includes built-in error detection capabilities for parity, framing, overrun, and false start bits.

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel operations.
• Industrial communication interfaces utilizing TTL-compatible logic levels.
• Embedded systems requiring multiple asynchronous serial ports with reduced interrupt latency.

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific ordering suffix matches required environmental certifications such as lead-free status and RoHS compliance. Review historical availability status as this model may be discontinued. Ensure storage conditions adhere to moisture sensitivity levels defined in the datasheet prior to soldering.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when designing systems requiring four independent asynchronous serial interfaces within a compact footprint. Evaluate the need for hardware-based FIFO buffering to reduce CPU intervention during high-throughput data transfers. Consider the available clock sources, including internal oscillators or external crystals, to determine if the built-in baud rate generator meets the specific timing requirements of the target application.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This QUART device belongs to the Philips Semiconductors legacy product line, now managed by NXP. It serves as a multi-channel expansion solution for microprocessors needing additional serial communication ports without dedicating separate pins for each UART. The architecture allows for flexible configuration of data formats, stop bits, and parity settings across all four channels simultaneously.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

Public confirmed substitute part numbers: SC28C94A1AJ, SC28C94A1A/S900,51.