SCC2691AC1N24,602

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The NXP USA Inc. SCC2691AC1N24,602 is a single-chip CMOS-LSI Universal Asynchronous Receiver/Transmitter (UART) providing full-duplex asynchronous communication. It operates from a single +5V power supply and features a quadruple buffered receiver data register to minimize overrun potential. The device supports independent baud rate selection for the receiver and transmitter via 18 fixed rates, a programmable counter/timer, or external clocks. Key electrical parameters include an operating ambient temperature range of 0°C to +70°C for the commercial version, with active power supply current typically at 0.8 mA. The component utilizes a 24-pin Plastic Dual In-Line Package (DIP).

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Full-duplex asynchronous receiver/transmitter with quadruple buffered receiver data register.
• Programmable data format supporting 5 to 8 data bits, parity options, and 1, 1.5, or 2 stop bits.
• Independent baud rate generation using fixed rates, internal counter/timer, or external clock inputs.
• Integrated 16-bit programmable counter/timer and on-chip crystal oscillator.

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel applications.
• Interrupt-driven systems needing reduced interrupt overhead.
• Multi-processor communications utilizing address frame recognition.

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix AC1N24 against the manufacturer's official documentation to confirm the package type and temperature grade. Ensure compatibility with existing system voltage requirements, as the device operates strictly from a single +5V supply. Confirm that the 24-pin DIP footprint matches the target PCB design constraints before finalizing procurement decisions.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this UART when independent baud rate control for transmit and receive channels is required. The quadruple buffering makes it suitable for high-throughput interrupt-driven environments. Consider the available packages, including PLCC and SOL, if space constraints differ from the DIP option. Verify that the host system can support the necessary TTL-compatible logic levels and timing requirements.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

The SCC2691 is part of the Philips Semiconductors (now NXP) UART family, superseding earlier data from September 1998. It is designed to provide high-density, low-power communication solutions using CMOS technology. The device maintains compatibility with standard microprocessor interfaces while offering advanced features like multi-purpose I/O pins and comprehensive interrupt handling capabilities.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

Check for direct pin-to-pin replacements within the same product family, such as other variants in the SCC269x series, ensuring identical package dimensions and electrical characteristics. Verify software register compatibility if migrating between different UART models to avoid code modifications.