SCC2692AC1B44,551

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SCC2692AC1B44,551 is a Dual Universal Asynchronous Receiver/Transmitter (DUART) manufactured by NXP Semiconductors. It provides two full-duplex asynchronous receiver/transmitter channels in a single package, compatible with the SCN2681. The device interfaces directly with microprocessors and supports polled or interrupt-driven systems. Each channel features independent programmable data formats (5 to 8 data bits plus parity, 1, 1.5, or 2 stop bits) and baud rates selectable from 22 fixed rates up to 115.2k baud, non-standard rates, or external clocks. Maximum data transfer rates reach 1MB/sec at 1X clock and 125kB/sec at 16X clock. It includes quadruple buffered receiver data registers, a 16-bit programmable counter/timer, multi-function I/O ports, and an on-chip crystal oscillator.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Dual full-duplex asynchronous receiver/transmitters with independent channel programming
• Quadruple buffered receiver data register to minimize overrun potential
• Programmable baud rate generator supporting fixed, non-standard, and external clock sources
• Multi-function 7-bit input port and 8-bit output port with change-of-state detection

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel applications
• Polled or interrupt-driven microprocessor communication systems
• Multidrop serial communication networks utilizing automatic wake-up mode

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix ',551' against official NXP documentation to confirm tape-and-reel packaging specifications, as standard datasheets may list generic PQFP variants. Confirm that the commercial temperature range rating (+0°C to +70°C) aligns with your system requirements, as industrial versions carry different suffixes. Ensure compatibility with existing PCB footprints for the 44-pin Plastic Quad Flat Pack (PQFP) package before procurement.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when dual independent UART channels are required within a single footprint. Ensure the host system can provide a stable 3.6864 MHz clock source for the X1/CLK pin if standard baud rates are needed. Verify that the 5V logic levels match the interfacing microprocessor voltage. Consider the interrupt capabilities and buffer depth if high-throughput data handling is critical to avoid data loss during peak transmission periods.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

The SCC2692 series belongs to NXP's legacy DUART family, superseding earlier designs like the SCN2681. It is designed for robust serial communication in embedded environments. The AC1B44 variant specifically denotes the commercial temperature grade housed in a 44-pin PQFP package. This part serves as a bridge between parallel microprocessor buses and asynchronous serial data streams, offering flexibility through programmable modes and extensive error detection features.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

SCC2692AE1B44: Industrial temperature version (-40°C to +85°C). SC26C92A1A: Similar DUART with FIFOs and 2.5V operation capability.