SC28L91A1B,528

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SC28L91A1B,528 is a single-channel Universal Asynchronous Receiver/Transmitter (UART) from the IMPACT family, manufactured by NXP Semiconductors. It operates on a single +3.3 V or +5 V power supply within an ambient temperature range of –40 °C to +85 °C. The device features 16-byte receive and transmit FIFOs to minimize overrun and underrun errors. It supports bus interfaces for both Intel (80xxx) and Motorola (68K) architectures via pin programming. Data rates are selectable from 28 fixed baud rates up to 230.4 kbit/s, with programmable user-defined rates reaching 1 Mbit/s using external clocks.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Supports dual-bus interface compatibility through pin-selectable Intel or Motorola protocols
• Integrates 16-byte FIFO buffers for both receiver and transmitter channels
• Includes an on-chip crystal oscillator and programmable counter/timer for baud rate generation
• Provides versatile I/O ports with change-of-state detection and configurable interrupt outputs

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel communication
• Multi-drop applications utilizing automatic wake-up modes
• Interrupt-driven microprocessor systems with DMA interface requirements

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix against the manufacturer's current data sheet to confirm package type and industrial temperature rating. Ensure that the required bus interface mode matches the hardware configuration, as the SC28L91A1B variant corresponds to the PQFP-44 package. Cross-reference the part number with official NXP documentation to validate RoHS compliance status and availability in the designated region.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when a single UART channel with high-speed FIFO buffering is required for embedded serial communications. The device is suitable for designs needing flexible clocking options via internal counters or external sources. Consider the available GPIO ports for additional control signals if system complexity requires integrated flow management without external logic gates.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This UART belongs to the IMPACT family of Serial Communications Controllers, designed to replace older single-channel parts while maintaining software compatibility with previous Philips offerings. It serves as a bridge between microprocessors and asynchronous peripherals, offering enhanced performance over legacy devices like the SCC2691 through improved bus speeds and extended baud rate capabilities.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

The SCC2691 is explicitly noted as not being discontinued and remains a compatible alternative. Designers should verify register-level compatibility when migrating between these parts, particularly regarding interrupt handling and FIFO depth configurations.