The ST18C552CJ is a dual universal asynchronous receiver/transmitter (UART) with a parallel interface, manufactured by Exar Corporation. It's designed to provide efficient serial communication for a variety of applications. This UART integrates enhanced features and flexibility, making it suitable for demanding data communication environments.

Applications

• Serial ports for embedded systems: Provides serial communication capabilities to embedded systems.
• Industrial automation: Used in industrial automation equipment for data acquisition and control.
• Point-of-sale (POS) terminals: Enables serial communication for POS devices.
• Networking equipment: Used in routers, switches, and other networking devices for serial console access and management.
• Multi-port serial cards: Forms the basis for multi-port serial communication cards.
• Modems and data communication devices: Integral for enabling serial communication in modems and related hardware.

Features

• Dual UART: Contains two independent UART channels.
• Parallel interface: Simplifies connection to microprocessors and microcontrollers.
• Data rates up to 1.5 Mbps: Supports high-speed serial communication.
• Programmable baud rate generator: Allows for flexible configuration of communication speeds.
• 16-byte transmit and receive FIFOs: Reduces CPU overhead by buffering data.
• Automatic hardware/software flow control: Ensures reliable data transfer.
• Interrupt generation: Signals the host processor when data is available or an error occurs.
• Modem control signals: Supports modem control functions such as CTS, RTS, DSR, DTR, and RI.
• Loopback mode: Facilitates testing and diagnostics.

Benefits

• Increased system throughput: High-speed data rates and efficient buffering improve system performance.
• Reduced CPU overhead: FIFOs and automatic flow control minimize the processing load on the host CPU.
• Flexible configuration: Programmable baud rates and interrupt options allow for customization to specific application requirements.
• Reliable data communication: Hardware and software flow control mechanisms ensure accurate data transfer.
• Simplified system design: Parallel interface and integrated features streamline hardware development.

Additional Details

The ST18C552CJ operates from a single 3.3V or 5V power supply. It is available in a variety of packages, including PLCC and PQFP. The device also incorporates power-down modes to conserve energy when not actively transmitting or receiving data. Its compatibility with industry-standard UART protocols and its robust feature set make it a versatile choice for serial communication applications.

The UART provides comprehensive error detection, including parity, framing, and overrun errors, enhancing the reliability of data transmission. It also includes a local loopback feature for onboard diagnostics. The Exar ST18C552CJ is a highly integrated and capable dual UART solution for diverse serial communication needs.