Analog Devices Inc./Maxim Integrated MAX213ECAI+T

MAX213ECAI+T Analog Devices/Maxim Integrated RS-232 Transceiver Product Summary

The MAX213ECAI+T from Analog Devices/Maxim Integrated is a highly integrated, high-robustness RS-232 transceiver designed for demanding applications requiring reliable serial communication and enhanced electrostatic discharge (ESD) protection. Built around a single +5V supply with an internal charge pump, the MAX213ECAI+T delivers a full set of four transmitters and four receivers (4/4 configuration) in a space-efficient 28-SSOP package. Its advanced ESD immunity and low-power modes make it a preferred choice for battery-powered, portable, and diagnostic equipment where board space, power consumption, and signal integrity are at a premium.

MAX213ECAI+T Key Attributes Durability, Integration, and Power Efficiency

Engineers evaluating RS-232 transceivers for embedded communication hardware will note that the MAX213ECAI+T offers several strengths:

High ESD Protection: Survives ±15kV discharges per Human Body Model and ±8kV contact per IEC1000-4-2, supporting equipment designed for tough industrial and portable environments.

Charge Pump Integration: Internal charge-pump circuitry enables operation from a single +5V supply, eliminating the need for external ±12V rails and lowering BOM complexity.

Space-Efficient Package: The 28-SSOP form saves PCB area compared to standard SO packages, facilitating more compact systems.

Low-Power Operation: With ultra-low shutdown currents (typically 15μA), the device suits batteryand power-sensitive designs.

Data Rate Capability: Fully compliant with EIA/TIA-232E and CCITT V.28 standards at rates up to 120kbps, ensuring reliable protocol performance.

Enhanced Input/Output Configurability: On-chip pull-ups on unused driver inputs and high-impedance receiver outputs in shutdown mode simplify system integration and multiplexing.

MAX213ECAI+T Technical Details and Absolute Maximum Ratings

The MAX213ECAI+T’s electrical and mechanical specifications cater to robust and compliant RS-232 physical layer implementation:

Supply Voltage (VCC): -0.3V to +6V absolute maximum, nominal +5V.

Output Voltages: T_OUT ranges from (V-0.3V) to (V+ + 0.3V); R_OUT can reach -0.3V to (VCC + 0.3V).

Input Voltages: Robust to up to ±30V on R_IN.

Thermal Dissipation: 762mW for the 28-SSOP package with derating above +70°C.

Operating Temperature: Commercial grade 0°C to +70°C; extended versions support up to -40°C to +85°C.

Short-Circuit Protection: Transmitter outputs rated for continuous short-circuit withstand.

Storage and Soldering: -65°C to +165°C storage, up to +300°C lead temperature for soldering.

MAX213ECAI+T Functional Block Diagram Charge Pump, Driver, and Receiver Operations

The MAX213ECAI+T is architected for efficient voltage generation and signal translation:

Dual Charge Pump: Converts +5V input into the necessary ±10V rails for RS-232 signaling, using four external 0.1μF capacitors. The first stage doubles input voltage to +10V; the second inverts to -10V.

RS-232 Drivers: Output swings typically ±8V under nominal conditions, satisfying minimum ±5V specifications and capable of driving standard RS-232 loads (e.g., 3kΩ). All drivers invert logic levels, and unused driver inputs are maintained by internal pull-ups, ensuring predictable output states.

RS-232 Receivers: Translate RS-232 levels to CMOS/TTL logic thresholds. Receiver input thresholds (0.8V low, 2.4V high) are tight, permitting response to typical digital logic. Hysteresis (~0.5V) ensures noise immunity, with the exception of receivers R4 and R5 in shutdown mode, which remain active without hysteresis for power-efficient monitoring.

Control Features: Shutdown control minimizes consumption (to 15μA) and disables charge pumps and transmitter outputs. Enable control sets receiver outputs to high-impedance, supporting wire-OR system integration and multi-port UART architectures. The propagation delay is typically 0.5μs, rising to 4μs in shutdown mode.

Power “Stealing”: The V+ and Vgenerated can support small external loads (at the expense of output swing/noise margin), with increased capacitor values allowing greater current sourcing.

ESD Safeguards Implemented in MAX213ECAI+T

In field and manufacturing scenarios where device reliability is paramount, the MAX213ECAI+T’s ESD design stands out:

Human Body Model (HBM): Device withstands ±15kV, safeguarding against personnel-induced and handling-related discharges.

IEC1000-4-2 Compliance: Survives up to ±8kV contact and ±15kV air-gap discharges, exceeding Level 4 equipment requirements without additional external components.

Machine Model: Meets standard manufacturing ESD protection for all pins, reducing board or socket damage risk during PCB assembly and handling.

ESD Structures: Custom device-level ESD protection ensures non-latchup operation, maintaining reliable RS-232 port activity even after high-voltage events.

Optimal Use Recommendations for MAX213ECAI+T

Engineers should consider the following when integrating the MAX213ECAI+T:

Capacitor Selection: Use 0.1μF ceramic capacitors for charge pump operation; larger values (up to 10μF) reduce output ripple and support external load “stealing.” Ensure capacitor tolerance and ESR remain within specification across temperature extremes.

Power Supply Decoupling: Bypass VCC with at least 0.1μF, recommend matching or exceeding the size of charge-pump capacitors, especially in noise-sensitive systems.

Shutdown/Power Saving: Utilize shutdown mode to maximize battery life; wake-up time under 2ms ensures rapid resume.

High-Speed Communication: Achieve >120kbps compliant signaling provided cable capacitance is minimized—short runs recommended for high throughput.

Multiplexed Receivers: Enable control allows for safe wire-OR and multi-node RS-232 networking at the UART level.

System Layout: The compact 28-SSOP footprint allows dense placement in handheld, diagnostic, and portable instrument boards with critical PCB real estate constraints.

MAX213ECAI+T Packaging Information and Physical Dimensions

The MAX213ECAI+T is supplied in a 28-pin SSOP package, facilitating dense, low-profile assembly (conforming to JEDEC standards such as MS001-XX and MO-058AB). Package material complies with restricted substance regulations and is suitable for environments demanding RoHS compliance. Pinout and recommended PCB footprint are available from Analog Devices for optimizing board-level integration and automated production.

Alternative and Compatible Models for MAX213ECAI+T

In selecting an RS-232 transceiver, engineers may also consider other devices in the Analog Devices/Maxim Integrated family, depending on channel count, ESD requirements, or package constraints:

MAX202E, MAX232E: Lower channel count options; available in smaller 16-pin packages, with similar ESD and operational specifications.

MAX211E, MAX241E: Similar protection and circuit topology, varying in number of drivers/receivers.

MAX203E, MAX205E: Internal charge-pump capacitors for minimum external component count; suited for designs with even stricter space limitations.

Careful review of each model’s charge pump, shutdown, and package features will guide optimal part selection for specific system demands.

Conclusion

The MAX213ECAI+T by Analog Devices/Maxim Integrated establishes itself as a premium solution for engineers seeking high-ESD, power-efficient, and dense RS-232 transceiver integration. Its advanced protection, integrated voltage generation, and versatile control make it suitable for modern portable diagnostic and communication applications, where reliability and board economy are paramount. Careful following of recommended application practices will ensure robust, high-integrity serial links for demanding environments, while the breadth of family alternatives accommodates a wide range of design requirements.