ST3222EC

The ST3222EC is a low-power, half-duplex RS-232 transceiver manufactured by STMicroelectronics, designed for reliable serial communication over standard RS-232 interfaces. It operates from a single 3.0V to 5.5V power supply, making it suitable for both legacy and modern systems requiring voltage flexibility. The device supports data rates up to 120 kbps, ensuring efficient transmission of digital signals in industrial, consumer, and automotive applications. This transceiver features integrated charge pumps that generate the necessary ±10V output levels required by the RS-232 standard, eliminating the need for external high-voltage supplies. Its low quiescent current—typically 1.5 mA in active mode and as low as 1 µA in shutdown mode—makes it ideal for battery-powered or energy-sensitive systems. The ST3222EC also includes built-in protection against electrostatic discharge (ESD), with ±15 kV HBM compliance, enhancing robustness in harsh environments. In terms of functionality, the ST3222EC provides a single driver and receiver channel, supporting half-duplex communication where one line handles both transmit and receive functions. It features an enable pin (DE) that allows precise control over data transmission, enabling the device to switch between transmit and receive modes efficiently. The input and output logic levels are compatible with TTL/CMOS standards, simplifying integration into digital circuits without additional level-shifting components. Common applications include industrial automation equipment, medical instruments, point-of-sale terminals, and embedded systems where reliable serial communication is essential. Its compact SO8 package ensures compatibility with space-constrained designs, while its wide operating temperature range—from -40°C to +85°C—supports deployment in demanding environmental conditions. Additionally, the device meets regulatory standards such as FCC Part 15 and CE compliance, facilitating global market use. Overall, the ST3222EC delivers a balance of performance, reliability, and efficiency, making it a preferred choice for engineers seeking a cost-effective and robust solution for RS-232 interface requirements in diverse electronic systems.