XR68C681P

Overview

The XR68C681P is a CMOS Dual Channel UART (DUART) manufactured by MaxLinear, Inc. It features two independent serial communication channels within a single integrated circuit. The device supports data rates up to 1 Mbps and operates with a standard supply voltage of 5V. It is housed in a 40-pin Dual In-line Package (PDIP) designed for through-hole mounting. Key internal components include an internal oscillator and timer/counter capabilities, facilitating standalone serial I/O control without external clock sources.

Feature Summary

• Dual independent serial communication channels for simultaneous data transmission and reception
• Integrated internal oscillator eliminating the need for external clock generation circuits
• Built-in timer and counter functionality for baud rate generation and timing control
• CMOS technology ensuring low power consumption and compatibility with standard logic levels

Applications

• Industrial automation systems requiring reliable serial data exchange
• Embedded controllers needing multiple asynchronous communication ports
• Test and measurement equipment utilizing serial interfaces
• Legacy system integration where 5V logic and through-hole packaging are required

Procurement Notes

Verify component authenticity due to discontinued status. Check for lead-free compliance if RoHS3 standards are mandatory for the target assembly process. Confirm package integrity as the PDIP variant may have limited availability from secondary distributors. Ensure storage conditions meet moisture sensitivity level requirements before reflow or wave soldering processes.

Selection Notes

Select this part when dual UART functionality is required in a through-hole compatible package. Compare against surface-mount variants like the XR68C681CJTR-F if PCB space constraints dictate SMD solutions. Verify that the 5V operating voltage aligns with the system power rails. Consider the 1 Mbps maximum data rate against application throughput requirements.

Part Context

This component belongs to the XR68C681 family of dual UART controllers produced by Exar Corporation, now part of MaxLinear. The 'P' suffix specifically denotes the 40-pin PDIP package version. It serves as a direct replacement for legacy Motorola MC68681 devices in existing designs, maintaining pinout and functional compatibility while offering modern CMOS manufacturing benefits.

Replacement Considerations

The XR68C681CP is the identical functional equivalent in the same PDIP package. For surface mount applications, the XR68C681CJTR-F offers the same electrical characteristics in a 44-PLCC package, though pin mapping differences must be addressed during redesign.