SC16C754IB80,557

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SC16C754IB80,557 is a quad universal asynchronous receiver/transmitter (UART) featuring 64-byte FIFOs for both transmit and receive channels. It supports data rates up to 5 Mbits/s at 3.3 V and 5 V operation, with a maximum of 3 Mbits/s at 2.5 V. The device includes automatic hardware and software flow control, programmable baud rate generation via a divisor between 1 and 65535, and an internal loop-back capability for diagnostics. It operates on an 8-bit peripheral bus with selectable character lengths of 5, 6, 7, or 8 bits, and supports even, odd, or no parity with 1, 1.5, or 2 stop bits. The component is housed in an LQFP80 plastic low profile quad flat package.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Quad UART architecture with independent 64-byte transmit and receive FIFOs per channel
• Automatic hardware flow control using Auto-RTS and Auto-CTS signals to prevent overrun errors
• Programmable software flow control with configurable Xon/Xoff characters and interrupt capabilities
• Fully prioritized interrupt system with six distinct levels for efficient processor management

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• High-speed serial communication interfaces requiring multiple independent channels
• Systems utilizing DMA transfers for reduced CPU overhead in data acquisition
• Modem interface applications requiring comprehensive modem status signal monitoring
• Embedded controllers needing robust error detection including break, idle, and framing errors

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix IB80 corresponds to the LQFP80 package variant when sourcing. Confirm voltage requirements align with the 3.3 V or 5 V operational specifications provided in the datasheet. Ensure compatibility with existing address decoding logic for the CSA-CSD chip select pins. Validate that the host system can support the required clock frequencies for the desired baud rate generation.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when four independent UART channels are required within a single integrated circuit. Consider the 64-byte FIFO depth for applications demanding high throughput with minimal processor intervention. Evaluate the need for hardware versus software flow control based on system latency requirements. Ensure the available clock source matches the programmable baud rate generator input constraints.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This part belongs to the SC16C754 family of quad UARTs, which are pin-compatible with the SC16C654IA68 and SC16C554IA68 devices. The IB80 suffix specifically denotes the LQFP80 package version, distinguishing it from the PLCC68 variant (IA68). It serves as an enhanced successor to earlier single and dual UART models, offering increased FIFO capacity and advanced flow control features.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

The SC16C754IA68 is a pin-compatible alternative in the PLCC68 package. Direct functional substitutes include the SC16C654 and SC16C554 series, though these may lack the enhanced FIFO features or quad-channel configuration. Verify package dimensions and pin assignments before substitution.