MAX202EESE Overview

The MAX202EESE is part of the MAX202E–MAX213E family of RS-232/V.28 transceivers. It provides up to ±15kV ESD (Human Body Model) protection and has a built-in charge pump. It works with a single +5V power supply. The drivers and receivers meet EIA/TIA-232E and CCITT V.28 standards. It supports data rates up to 120kbps, making it suitable for industrial and communication interfaces.

The MAX202EESE comes in a 16-pin package, which fits different PCB layouts and space requirements. Its built-in charge pump does not need external capacitors and can generate the required RS-232 voltage levels, simplifying the circuit design.

With high ESD protection, standard compliance, and single-supply operation, the MAX202EESE is ideal for embedded systems, communication devices, and industrial control applications. It helps developers achieve reliable serial data transfer and interface protection.

MAX202EESE Key Specifications

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MAX202EESE Pinout

C1+, C1-, C2+, C2- (Pins 1, 3, 4, 5)

These pins connect to external capacitors. They are used by the internal charge pump to generate positive and negative voltages needed for RS-232 signal levels.

V+, V- (Pins 2, 6)

Outputs of the charge pump’s positive and negative voltages. These pins usually connect to capacitors and work together with C1 and C2.

T2OUT, T1OUT (Pins 7, 14)

RS-232 driver outputs. They convert TTL/CMOS logic levels to RS-232 signal levels.

R2IN, R1IN (Pins 8, 13)

RS-232 receiver inputs. They receive RS-232 signals and convert them to TTL/CMOS logic levels.

T1IN, T2IN (Pins 11, 10)

TTL/CMOS logic inputs. They provide signals to the driver for conversion into RS-232 levels.

R1OUT, R2OUT (Pins 12, 9)

Receiver outputs. They output TTL/CMOS logic signals converted from RS-232 inputs.

VCC (Pin 16) / GND (Pin 15)

Power supply pins. Typically, VCC is +5V.

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MAX202EESE Benefits and Features

Saves Board Space

• Integrated High ±15kV HBM ESD Protection

• Integrated Charge Pump Circuitry

- Eliminates the Need for a Bipolar ±12V Supply

- Enables Single Supply Operation From +5V Supply

• Integrated 0.1μF Capacitors

• 16 pin SOP Package

• Single +5V Operation

• Dual RS-232 Channels

• TTL/CMOS Compatible

Saves Power for Reduced Power Requirements

• 1μA Shutdown Mode

• 15μA Shutdown Mode for MAX213E

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MAX202EESE Typical Operating Circuit

The typical operating circuit of the MAX202EESE shows a single +5V power supply connected to VCC (pin 16) and GND (pin 15). Four external capacitors (0.1 µF each) are connected to pins C1+, C1-, C2+, and C2- to support the internal charge pump. The charge pump generates positive and negative voltages (V+ and V-, pins 2 and 6), which are necessary to drive RS-232 output levels from the TTL/CMOS input signals. Additional decoupling capacitors are added to stabilize the internal voltage conversion.

The TTL/CMOS logic inputs (T1IN, T2IN) feed the internal drivers, which convert these signals to RS-232 voltage levels and output them on T1OUT and T2OUT (pins 14 and 7). Conversely, RS-232 inputs (R1IN, R2IN) are fed into the internal receivers, which convert the signals back to TTL/CMOS levels and output them on R1OUT and R2OUT (pins 12 and 9). The diagram also shows small 5 kΩ resistors between the receiver outputs and ground, which help stabilize the output signals.

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MAX202EESE Application Fields

1. Embedded Systems

The MAX202EESE is often used in embedded systems for serial communication. It enables reliable data transfer between microcontrollers and external devices.

The chip also offers ±15kV ESD protection (HBM). This protects system interfaces and ensures long-term reliability in industrial or lab environments.

2. Communication Devices

In communication devices, the MAX202EESE handles serial port data transmission and reception. It is used in modems, routers, and serial terminals. Its high drive capability keeps RS-232 signals stable over long distances.

The built-in charge pump removes the need for dual power supplies. This simplifies design and reduces system cost.

3. Industrial Control

The MAX202EESE is used in industrial control for PLCs, sensors, and instruments. Its strong noise immunity and ESD protection prevent signal errors from mechanical or electrical interference.

It supports full-duplex RS-232 communication, enabling real-time data exchange between multiple devices. This meets strict reliability and stability requirements in industrial environments.

4. Battery-Powered Equipment

Low power consumption makes the MAX202EESE ideal for battery-powered devices. Examples include portable meters, handheld terminals, and mobile data collectors. Its single +5V supply and internal charge pump reduce extra power needs, helping to extend battery life.

Its small package fits well in space-limited devices, keeping them light while maintaining high communication performance.

5. Portable Diagnostics Equipment

The MAX202EESE is used in portable diagnostic devices for medical or testing instruments. Its ESD protection and high reliability keep devices stable in frequent plug-and-play or mobile use.

It allows portable devices to remain light and compact without compromising communication performance, meeting the needs for fast on-site diagnostics and data transfer.

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FAQs

What is the MAX202EESE?

The MAX202EESE is an RS-232 transceiver. It converts TTL/CMOS logic levels to RS-232 signals and vice versa. It is part of the MAX202E–MAX213E family.

Does it need external capacitors?

Yes, four external capacitors are needed for the internal charge pump to operate properly. Typical values are 0.1–1 µF.

What is its ESD protection?

The MAX202EESE offers ±15kV Human Body Model (HBM) ESD protection on all pins, making it robust against static discharge.

What is the package type?

It is available in an SOIC-16 package (MAX202EESE) suitable for surface-mount PCB designs.

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