Analog Devices Inc./Maxim Integrated MAX213EEWI+

Summary of the MAX213EEWI RS-232 Transceiver

The MAX213EEWI transceiver from Analog Devices Inc./Maxim Integrated is a highly integrated RS-232/V.28 communication IC designed for reliable serial data transmission in embedded and industrial systems. Featuring a full-duplex configuration with four drivers and five receivers, the MAX213EEWI targets applications requiring robust RS-232 interfaces with high ESD immunity and single-supply operation. It comes in a surface-mount 28-SOIC package, suitable for automated assembly and compact system layouts. With a specified operating voltage range of 4.5V to 5V and an industrial temperature range of -40℃ to +85℃, the MAX213EEWI supports environments demanding both reliability and extended temperature tolerance. Notably, this device is classified as obsolete, which makes understanding its specifications and alternatives crucial for ongoing projects or legacy system maintenance.

Main Characteristics and Advantages of the MAX213EEWI

The MAX213EEWI incorporates advanced features favoring streamlined board design and enhanced durability, particularly in demanding engineering applications. Its integrated charge-pump circuitry enables operation from a single +5V supply, eliminating the need for complex dual supply topologies (±12V), thereby simplifying power architecture and reducing component count. Furthermore, with built-in ±15kV human body model ESD protection on all transmitter outputs and receiver inputs, the IC provides robust defense against electrostatic events commonly encountered during installation and maintenance.

Engineers benefit from the device's low-power operation: the MAX213EEWI integrates functional shutdown capability, with supply current dropping to as low as 15μA in shutdown mode, supporting power-sensitive applications such as battery-powered or portable handheld instruments. The full-duplex design conforms to EIA/TIA-232E and CCITT V.28 standards, supporting data transmission rates up to 120kbps. Internal receiver and driver circuits enable consistent signal integrity, even under heavy capacitive loads, promoting reliable communications in electrically noisy environments.

Technical Specifications of the MAX213EEWI

Evaluating electrical performance is vital for matching the MAX213EEWI to system requirements. Its supply current typically ranges from 14mA to 20mA during normal operation, depending on load and configuration, while logic-level input thresholds are set at 0.8V for low and 2.4V for high, ensuring clear interface with TTL and CMOS system logic.

RS-232 receiver inputs accept signal levels between -30V and +30V, with input hysteresis values between 0.2V and 1.0V—parameters that contribute to stable data reception and noise immunity. Output voltage swings for transmitter drivers maintain ±5V minimum, supporting reliable RS-232 signaling over extended cable runs. The IC sustains continuous short-circuit conditions at the transmitter outputs, enhancing overall system fault tolerance. Data rates up to 120kbps are supported, and the transition-region slew rate is controlled between 3V/μs and 30V/μs, which helps minimize electromagnetic interference (EMI) in dense PCB designs. Pin leakage currents and output voltages align with industry expectations for signal level and integrity.

Operational Details and Packaging Information for MAX213EEWI Usage

Integration of the MAX213EEWI into a system involves attention to functional pin assignments and package characteristics. The surface-mount 28-SOIC format (7.5mm width) optimizes board space and is compatible with standard automated pick-and-place processes. The device includes pins for charge-pump capacitors, which generate the required voltages for RS-232 signaling from a single +5V supply. Addressing power and system control, the MAX213EEWI features both enable (EN) and shutdown (SHDN) pins, with flexible logic polarities: receivers R4 and R5 remain active in shutdown when EN is asserted, providing selective data path monitoring during system standby.

Signal paths for transmit (T_IN/T_OUT) and receive (R_IN/R_OUT) channels are clearly segregated, and the internal receiver outputs are implemented as TTL/CMOS compatible. Internal pullups on driver inputs facilitate predictable logic levels, while GND and VCC pins follow standard conventions for supply and ground connections.

Design Guidelines and Application Tips for MAX213EEWI

Successful design with the MAX213EEWI requires consideration of data communication system demands and board-level constraints. Single-supply operation eases power distribution planning and supports modular expansion, while high ESD protection is essential for environments with frequent human interaction or field wiring—such as in diagnostic equipment, measurement instruments, and portable battery-powered systems.

Engineers should note the device’s suitability for full-duplex serial links, especially in applications where reliable bidirectional data transfer is needed. The industrial temperature rating ensures operation in outdoor or factory floor conditions. When designing for signal integrity, capacitive loads up to several thousand picofarads are tolerated without compromising output waveform parameters, facilitating robust communications over long or capacitively loaded cables.

Attention to shutdown and enable controls allows designers to minimize energy consumption and selectively activate parts of a communication network, which is particularly relevant in applications with sleep or standby modes. The 28-SOIC footprint must be factored into layout planning, ensuring adequate spacing for charge pump capacitors and signal routing.

Possible Alternative or Substitute Devices for MAX213EEWI

Given the obsolete status of the MAX213EEWI, engineers responsible for legacy system maintenance or new designs should evaluate available alternatives within the same series and function class. The MAX213E family includes functionally similar models with varying pin counts, shutdown capability, and charge pump configurations. Notably, the MAX211E and MAX241E offer comparable driver/receiver counts, ESD protection, and package options. Models such as MAX202E, MAX203E, MAX205E, MAX206E, MAX207E, MAX208E, MAX232E, and MAX241E each present distinct configurations—ranging in supply current, shutdown operation, capacitor requirements, and number of channels—allowing for tailored selection based on system topology and feature needs.

During cross-model comparisons, critical parameters to consider are maximum data rate, supply voltage tolerance, ESD robustness, shutdown currents, and compatibility with existing board layouts (especially package footprints and pinout). Review of the associated selector guide and datasheets is recommended to ensure the closest functional and electrical match for continued reliability and field support.

Conclusion

The MAX213EEWI RS-232 transceiver stands out for its combination of integration, ESD protection, low-power operation, and ease of implementation within both industrial and portable electronic systems. While now obsolete, its capabilities remain relevant for legacy equipment and replacement evaluation. Engineers tasked with selecting, specifying, or updating RS-232 transceivers should weigh the electrical characteristics, system-level features, and package compatibility of the MAX213EEWI—while also rigorously reviewing available replacement models to secure ongoing product support and system functionality.