PC16552DV

Overview

The PC16552DV is a dual universal asynchronous receiver/transmitter (DUART) fabricated using M2CMOS technology. It features two independent serial channels with on-chip 16-byte transmitter and receiver FIFOs to reduce CPU overhead. The device operates at a single +5V supply voltage and supports data rates up to 1.5 Mbps. It includes programmable baud rate generators, complete modem control capabilities, and a prioritized interrupt system. The component is housed in a 44-pin PLCC package.

Feature Summary

• Dual independent UART channels sharing a common CPU interface
• On-chip 16-byte FIFO buffers for both transmit and receive paths
• Programmable baud rate generators supporting divisors from 1 to 65535
• Complete hardware modem control signals including CTS, RTS, DSR, DTR, RI, and DCD

Applications

• High-performance serial communication interfaces requiring reduced CPU intervention
• Industrial control systems utilizing RS-232 or RS-485 protocols
• Embedded systems integrating multiple asynchronous data links

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm pinout compatibility and electrical characteristics. Confirm RoHS compliance status as older manufacturing runs may differ from current standards. Ensure the 44-PLCC package dimensions match the target PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when a design requires two fully independent serial ports within a single integrated circuit. The presence of hardware FIFOs makes it suitable for applications where software polling would otherwise consume excessive processor cycles. Verify that the system clock frequency allows for the required baud rate accuracy using the available divisor values.

Part Context

This part belongs to the PC16550/PC16552 family of dual UARTs developed by National Semiconductor, which was acquired by Texas Instruments. It serves as an enhanced successor to the standard 16450 UART architecture by adding hardware buffering and advanced flow control features while maintaining register compatibility.

Replacement Considerations

The TL16C552AFNR is a documented alternative from Texas Instruments. Verify pin-to-pin compatibility and ensure the replacement meets the same 44-PLCC package requirements.