PI7C9X794FCE

Controllers Overview

The PI7C9X794 is a quad Universal Asynchronous Receiver and Transmitter (UART) designed for high bandwidth communication systems. It operates on a 1.62V to 3.6V supply with 5V tolerant serial inputs. The device integrates four independent UART channels, each featuring 64-byte transmit and receive FIFOs and a 16C550 compatible register set. It supports data rates up to 8 Mbps using a 64MHz external clock or an internal crystal oscillator up to 24MHz. A global interrupt output consolidates status for all channels, while a built-in 16-bit timer/counter and sleep mode enhance system efficiency.

Controllers Feature Summary

• Integrates four independent UART channels with 64-byte TX/RX FIFOs and 16C550 compatibility
• Provides a single global interrupt output for consolidated status monitoring of all channels
• Supports automatic hardware flow control (RTS/CTS, DTR/DSR) and software flow control (Xon/Xoff)
• Includes an infrared encoder/decoder compliant with IrDA 1.0/1.1 standards

Controllers Applications

• Remote Access Servers
• Ethernet Network to Serial Ports
• Network Management Systems
• Factory Automation and Process Control
• Multi-port RS-232/RS-422/RS-485 Interface Cards

Controllers Procurement Notes

Verify the specific ordering suffix against Diodes Incorporated documentation to confirm package type and tape/reel specifications. Confirm RoHS compliance status and moisture sensitivity level requirements prior to PCB assembly. Ensure the host interface voltage matches the 1.62V to 3.6V operating range. Validate that XTAL1 input constraints are respected as it lacks 5V tolerance.

Controllers Selection Notes

Select this component when a compact solution requires multiple asynchronous serial ports with high throughput capabilities. The integrated FIFOs reduce CPU overhead compared to standard 16550 devices. Ensure the design accommodates the LQFP-64 package footprint. Verify that the application benefits from the global interrupt feature for simplified driver architecture. Consider the power consumption characteristics if battery operation is required due to the sleep mode capability.

Controllers Part Context

This part belongs to the PI7C9X series of interface ICs manufactured by Diodes Incorporated. It serves as a high-density serial communication controller, replacing discrete UART solutions. The device is positioned for applications requiring multiple serial interfaces in space-constrained environments. It complements other interface products in the portfolio by offering integrated FIFO management and advanced flow control features.

Controllers Replacement Considerations

Direct pin-to-pin replacements should be verified against official substitution lists. Legacy XR16V794 equivalents may require firmware adjustments due to register mapping differences. Ensure any substitute maintains the 64-byte FIFO depth and 5V tolerant I/O levels. Check for compatibility with existing Intel or Motorola bus interface configurations.