XR16C854CQ

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The XR16C854CQ is a quad universal asynchronous receiver/transmitter (UART) integrated circuit manufactured by Sipex. It integrates four independent UART channels with 16-byte transmit and receive FIFOs on a single chip, supporting data rates up to 3 Mbps. The device operates from a single +5V power supply and includes an onboard 1.8432 MHz crystal oscillator for clock generation. It features full hardware flow control via RTS/CTS and DTR/DSR signals, along with software programmable interrupts. The component supports RS-232 and RS-422/RS-485 communication standards and is housed in a 64-pin LQFP package.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Integrates four independent UART channels with 16-byte FIFOs to reduce system bus traffic
• Includes onboard 1.8432 MHz crystal oscillator eliminating external clock components
• Supports full hardware flow control through RTS, CTS, DTR, and DSR signal lines
• Compatible with RS-232, RS-422, and RS-485 serial communication standards

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Industrial automation systems requiring multiple serial ports
• Telecommunications equipment and modems
• Point-of-sale (POS) terminals and payment systems
• Medical instrumentation with serial data logging

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the manufacturer designation as Sipex or its successor entities, as corporate acquisitions may affect part numbering conventions. Confirm the specific suffix 'CQ' corresponds to the commercial temperature range and 64-pin LQFP package variant. Request official datasheets to validate pinout compatibility and electrical characteristics against current design requirements before procurement.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when a design requires four independent serial interfaces within a single footprint. Ensure the application environment remains within the commercial operating temperature limits specified for the 'C' suffix. Verify that the system power supply provides a stable +5V rail, as the device does not include internal voltage regulators for other logic levels.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This component belongs to the XR16C85x family of multi-port UARTs, designed to replace discrete UART chips and interface adapters. It serves as a central serial communication hub in embedded systems, consolidating multiple serial connections into one IC to save board space and simplify routing compared to using individual UART controllers.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

Check for direct replacements from the same product family with updated suffixes indicating different packages or temperature grades. Verify cross-compatibility with similar quad UART devices from other manufacturers, ensuring pin-to-pin alignment and register-level software compatibility.