SCC2692AE1N40,129

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SCC2692AE1N40,129 is a Dual Universal Asynchronous Receiver/Transmitter (DUART) compatible with the SCN2681. It provides two full-duplex asynchronous channels in a single package, interfacing directly with microprocessors via an 8-bit data bus and 4 address lines. The device operates on a single +5V supply within the industrial temperature range of -40°C to +85°C. Each channel supports independent baud rate selection from 22 fixed rates up to 115.2k baud, non-standard rates derived from a 16-bit programmable counter/timer, or external clocks. Key electrical parameters include a maximum data transfer rate of 1MB/sec at 1X clocking and 125kB/sec at 16X clocking. The receiver features quadruple buffering to minimize overrun errors.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Dual full-duplex asynchronous receiver/transmitters with independent programming capabilities for each channel.
• Quadruple buffered receiver data register designed to reduce interrupt overhead and prevent receiver over-run.
• Programmable data format supporting 5 to 8 data bits plus parity, with selectable odd, even, no, or forced parity.
• Integrated multipurpose 7-bit input port and 8-bit output port configurable for general I/O or specific control functions.

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Clustered terminal systems requiring dual-speed channel applications.
• Interrupt-driven microprocessor communication systems.
• Multidrop serial communication networks utilizing automatic wake-up modes.

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the component marking against the official Philips/NXP datasheet specifications to confirm authenticity. Ensure the operating voltage remains strictly within the +5V tolerance and that the industrial temperature rating matches the environmental requirements. Cross-reference the package type and pinout configuration to guarantee compatibility with the target circuit design before integration.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this component when a system requires two independent asynchronous serial interfaces with high-level programmability. The quadruple buffering makes it suitable for interrupt-heavy environments where minimizing CPU overhead is critical. Verify that the required baud rates can be supported by the available crystal frequency or external clock sources, as standard rates require a 3.6864MHz reference.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This device belongs to the SCC2692 family of dual UARTs manufactured by Philips Semiconductors, now NXP. It serves as a CMOS-LSI communications interface replacing older bipolar technologies. The 'AE1' suffix denotes the industrial temperature grade (-40°C to +85°C), while 'N40' specifies the 40-pin plastic dual in-line package (DIP).

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

The SCC2692 is functionally compatible with the SCN2681. Designers should verify pinout compatibility and timing characteristics when substituting components. No direct modern equivalents are listed in the provided documentation; legacy replacements may require adapter solutions.