SC28L92A1BS,551

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SC28L92A1BS,551 is a Dual Universal Asynchronous Receiver/Transmitter (DUART) from NXP Semiconductors. It operates on a single 3.3 V or 5 V supply and supports data transfer rates up to 1 Mbit/s. The device features two independent full-duplex channels, each equipped with 16-byte FIFOs for both reception and transmission. It provides pin-programmable compatibility with Intel (80xxx) and Motorola (68xxx) bus interfaces. The component includes an on-chip crystal oscillator, programmable baud rate generators, and a watchdog timer for each receiver.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Dual full-duplex asynchronous receiver/transmitters with independent channel programming
• 16-character FIFOs for each receiver and transmitter to minimize overrun and underrun
• Pin-programmable interface supporting both Intel (80xxx) and Motorola (68xxx) bus architectures
• Integrated watchdog timer for each receiver and programmable interrupt system

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel applications
• Microprocessor-based serial communication systems using polled or interrupt-driven modes
• Multi-drop applications utilizing automatic wake-up mode
• Systems requiring direct modem and DMA interface integration

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix matches the HVQFN48 package variant. Confirm that the required bus interface mode aligns with the hardware configuration of the target microprocessor system. Ensure power supply voltage specifications are within the allowed 3.3 V or 5 V ranges for reliable operation.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when a pin-compatible replacement for SCC2692 or SC26C92 is needed with enhanced FIFO depth. Choose the HVQFN48 package for space-constrained designs requiring thermal enhancement. Verify that the required baud rates and bus timing constraints are supported by the internal clock selectors.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This part belongs to the SC28L92 family of DUARTs manufactured by NXP Semiconductors. It serves as a modernized successor to legacy UART controllers, offering deeper buffers and extended baud rate capabilities while maintaining backward compatibility with older bus standards.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

SC28L92A1B

UARTs (Universal Asynchronous Receiver Transmitter) FAQ

How is the bus interface type selected?

The bus interface is selected via the I/M pin. Connecting it HIGH configures the device for the Intel (80xxx) interface, while connecting it LOW configures it for the Motorola (68xxx) interface.

Can the FIFO size be adjusted?

Yes, the FIFO fill capacity can be configured to operate at either 8 bytes or 16 bytes per channel. This is controlled by bit 3 of the MR0A register to ensure strict compliance with legacy devices if necessary.

What is the maximum data transfer rate?

The maximum data transfer rate is 1 Mbit/s, achievable with either a 1× or 16× clock derived from the programmable counter/timer or external clock inputs.