**ADM213EARUZ: A Comprehensive Guide to the RS-232 Transceiver IC**

In the realm of serial communication, the **RS-232 standard** remains a foundational protocol for point-to-point data exchange between devices. The ADM213EARUZ from Analog Devices is a pivotal integrated circuit (IC) that serves as a complete **RS-232 transceiver solution**, engineered to facilitate robust communication in demanding environments. This IC is specifically designed to translate signals between a computer's internal logic levels (typically ±5V or ±3.3V) and the higher voltage levels (±25V) mandated by the RS-232 standard, ensuring data integrity over longer cable lengths.

Housed in a compact 20-pin SSOP package, the ADM213EARUZ integrates **four transmitters and five receivers**, offering a versatile channel configuration for full-duplex communication. A key feature of this IC is its **on-board charge-pump circuitry**, which eliminates the need for the bulky and expensive external ±12V power supplies traditionally associated with RS-232 interfaces. This internal charge pump generates the necessary positive and negative transmission voltages from a single +5V power source, significantly simplifying system design and reducing both board space and overall cost.

The transceiver operates at data rates up to **120kbps**, making it suitable for a wide array of applications, from industrial control systems and laboratory instruments to point-of-sale (POS) terminals and legacy computer peripherals. Furthermore, the ADM213EARUZ is designed with enhanced electrostatic discharge (ESD) protection. Each pin is shielded to withstand **±15kV ESD strikes** (using the Human Body Model), a critical attribute for interfaces frequently exposed to handling and harsh electrical environments, thereby drastically improving system reliability and longevity.

From an application perspective, the IC is straightforward to implement. The charge pump requires only a few small external capacitors to function, and the drivers and receivers are TTL/CMOS compatible. Its low power consumption and **shutdown mode** (which reduces power usage to a mere 5µW) make it an excellent choice for battery-powered or power-sensitive portable equipment.

ICGOODFIND: The ADM213EARUZ stands out as a highly integrated, robust, and cost-effective solution for modern RS-232 interface needs. Its combination of internal power generation, high-speed performance, and superior ESD protection makes it an indispensable component for designers bridging the gap between legacy serial interfaces and contemporary electronic systems.

**Keywords:** RS-232 Transceiver, Charge-Pump Circuitry, ESD Protection, Full-Duplex Communication, Single 5V Supply.