MAX236ERG

Overview

The MAX236ERG is a +5V-powered multichannel RS-232 driver and receiver manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 4.5V to 5.5V, consuming 10mA typical operating current. The device provides four drivers and three receivers with a data rate capability of 120kbps. It utilizes an integrated charge pump to generate ±10V from a single +5V source, eliminating the need for external bipolar supplies. The component supports a wide operating temperature range from -55°C to +125°C and features a shutdown mode for power reduction.

Feature Summary

• Integrated charge pump circuitry eliminates the requirement for external bipolar ±12V power supplies.
• Enables single-supply operation using only a +5V input.
• Includes a low-power shutdown mode to minimize energy consumption.

Applications

• Interface translation between TTL/CMOS logic and RS-232 standards
• Multidrop RS-232 communication networks
• Portable diagnostic equipment

Procurement Notes

Verify the specific package variant against the datasheet ordering information table to ensure correct pinout and thermal characteristics. Confirm that the selected temperature grade matches the environmental requirements of the target application. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select this component when designing systems requiring multiple RS-232 channels without access to negative voltage rails. Ensure the design accommodates the required external capacitors for the internal charge pump. Verify that the 120kbps data rate meets the system's communication speed requirements and that the package size fits the available PCB space constraints.

Part Context

This device belongs to the MAX220–MAX249 family of line drivers and receivers designed for EIA/TIA-232E and V.28/V.24 interfaces. The family offers various channel configurations and packages to address different board space and performance needs while maintaining compatibility with standard RS-232 signaling levels.

Replacement Considerations

Compatible substitutes within the same family include the MAX232, MAX233, and MAX235. These alternatives share similar operational principles but differ in channel counts, package types, and specific control features such as enable pins or integrated capacitor options.

FAQ

Does the MAX236ERG require external components for voltage generation?

Yes, it requires external capacitors connected to the V+, V-, C1+, C1-, C2+, and C2- pins to support the internal dual charge-pump DC-DC voltage converters.

What is the maximum input voltage tolerance for the receiver inputs?

The receiver inputs (RIN) are protected against voltages up to ±30V, allowing them to withstand fault conditions on the RS-232 bus.

How does the shutdown feature affect the internal charge pump?

When the shutdown pin is activated, the internal charge pumps cease operation, causing the V+ and V- outputs to fall to +5V and 0V respectively, significantly reducing supply current.