MAX3221CDB

Product Overview

• Category: Integrated Circuit (IC)
• Use: RS-232 Transceiver
• Characteristics: Low-power, 3.0V to 5.5V supply voltage, ESD protection, small package size
• Package: 20-pin SSOP (Shrink Small Outline Package)
• Essence: The MAX3221CDB is a low-power RS-232 transceiver designed for serial communication between devices operating at different voltage levels.
• Packaging/Quantity: Available in tape and reel packaging, with 250 units per reel.

Specifications

The MAX3221CDB has the following specifications:

• Supply Voltage Range: 3.0V to 5.5V
• Data Rate: Up to 120kbps
• Number of Channels: 1
• Operating Temperature Range: -40°C to +85°C
• ESD Protection: ±15kV Human Body Model (HBM), ±8kV IEC61000-4-2 Air-Gap Discharge, ±6kV IEC61000-4-2 Contact Discharge

Pin Configuration

The pin configuration of the MAX3221CDB is as follows:

```

---

| | --| VCC GND |-- Power Supply Pins --| RIN TOUT|-- Receiver Input / Transmitter Output --| ROUT RIN |-- Receiver Output / Transmitter Input --| CTS RTS |-- Clear To Send / Request To Send --| DSR DTR |-- Data Set Ready / Data Terminal Ready --| DCD RI |-- Data Carrier Detect / Ring Indicator |___________| ```

Functional Features

The MAX3221CDB offers the following functional features:

• Single-chip RS-232 transceiver
• Operates with a low supply voltage range, making it suitable for battery-powered devices
• Provides ESD protection, ensuring robustness against electrostatic discharges
• Supports data rates up to 120kbps
• Offers receiver hysteresis for improved noise immunity

Advantages and Disadvantages

Advantages of the MAX3221CDB include:

• Low-power operation
• Wide supply voltage range
• Small package size
• ESD protection

Disadvantages of the MAX3221CDB include:

• Limited data rate compared to some other transceivers
• Single-channel design may not be suitable for applications requiring multiple channels

Working Principles

The MAX3221CDB operates by converting logic-level signals from the device's UART (Universal Asynchronous Receiver/Transmitter) into RS-232 voltage levels. It uses internal charge pumps to generate the higher voltage levels required by RS-232 communication.

Application Field Plans

The MAX3221CDB is commonly used in various applications, including:

1. Industrial automation systems
2. Point-of-sale terminals
3. Networking equipment
4. Medical devices
5. Consumer electronics

Alternative Models

In addition to the MAX3221CDB, there are several alternative models available that offer similar functionality. Some popular alternatives include:

1. MAX3232CDB: Similar to MAX3221CDB but with two channels instead of one.
2. MAX3241ECAI: Enhanced version with higher data rate capability.
3. MAX3237ECAI: Four-channel RS-232 transceiver with advanced features.

These alternative models provide flexibility in choosing the most suitable transceiver for specific application requirements.

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