One microamp supply-current, +3V to +5.5V, 250kbps, RS-232 transmitter/receiver The **ICL3221IA** is a RS-232 transceiver manufactured by **Intersil** (now part of Renesas Electronics). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**  
- **Manufacturer:** Intersil  
- **Type:** RS-232 Transceiver  
- **Number of Drivers/Receivers:** 1 Driver, 1 Receiver  
- **Data Rate:** Up to **250 kbps**  
- **Supply Voltage (VCC):** **3.0V to 5.5V**  
- **Operating Temperature Range:** **-40°C to +85°C**  
- **Package:** **8-pin SOIC**  
- **ESD Protection:** **±15kV (Human Body Model)**  
- **Compliance:** Meets **EIA/TIA-232-F** standards  

### **Descriptions:**  
- The **ICL3221IA** is a low-power, single-channel RS-232 transceiver designed for **3V to 5.5V** systems.  
- It integrates a charge pump to generate RS-232 voltage levels (±5V to ±15V) from a single **3V to 5.5V** supply.  
- Suitable for **battery-powered** and **portable applications** due to its low power consumption.  

### **Features:**  
- **Single 3V to 5.5V Supply Operation**  
- **Auto Power-Down Feature** (when no signal is detected)  
- **Low Power Consumption** (1µA in shutdown mode)  
- **Enhanced ESD Protection** (±15kV HBM)  
- **Small Footprint (8-pin SOIC)**  
- **Compatible with TTL/CMOS Logic Levels**  

This information is based on the manufacturer's datasheet and technical documentation.

One microamp supply-current, +3V to +5.5V, 250kbps, RS-232 transmitter/receiver