PC16552DV/NOPB

Overview

The PC16552DV/NOPB is a dual universal asynchronous receiver/transmitter (DUART) fabricated using M2CMOS technology. It integrates two independent serial channels sharing a common CPU interface and crystal input. Each channel features on-chip 16-byte transmitter and receiver FIFOs to reduce CPU overhead. The device supports programmable baud rate generators dividing clocks from DC to 24 MHz by divisors of 1 to 65,535. It operates with a 5V supply, offers TRI-STATE TTL drive, and provides complete MODEM control capabilities including CTS, RTS, DSR, DTR, RI, and DCD signals.

Feature Summary

• Dual independent UART channels with shared CPU interface
• On-chip 16-byte FIFOs for both transmitter and receiver
• Programmable baud rate generators with wide divisor range
• Complete MODEM control and status reporting functions

Applications

• Serial communication interfaces in embedded systems
• MODEM control applications requiring hardware flow control
• Systems needing reduced CPU interrupt load via FIFO buffering

Procurement Notes

Verify the component matches the NS16552/PC16552D specification sheet SNLS387B. Confirm the package type corresponds to the V44A chip carrier or equivalent DIP variant as indicated in the ordering information section of the datasheet. Ensure the NOPB suffix indicates lead-free compliance if required by your assembly process.

Selection Notes

Select this component when dual independent serial ports are required within a single IC footprint. It is suitable for designs needing hardware FIFO buffering to minimize processor intervention during high-throughput serial transfers. Verify that the system clock frequency supports the desired baud rates using the provided divisor tables.

Part Context

This part is a dual version of the PC16550D UART. It maintains software compatibility with existing 16450 and PC16550D codebases. Upon reset, registers are identical to the 16450 register set, allowing legacy software to operate without modification before enabling FIFO modes.

Replacement Considerations

Publicly confirmed substitutes include the NS16552D and PC16550D (single channel). Verify pinout compatibility for direct replacement in dual-channel designs.