MAX218EPP

Overview

The MAX218EPP is a dual RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, designed for battery-powered EIA/TIA-232E and V.28/V.24 communications interfaces. It operates from a single supply voltage ranging from +1.8V to +4.25V, enabling direct operation from two alkaline, NiCd, or NiMH cells without external voltage regulators. The device integrates on-board DC-DC converters to generate the necessary ±6.5V voltages for true RS-232 levels. It features two drivers and two receivers with a guaranteed data rate of 120kbps. A shutdown mode reduces current consumption to 1µA, extending battery life in portable systems. The component is housed in a 20-pin Plastic DIP package and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• Operates directly from two alkaline, NiCd, or NiMH cells within a +1.8V to +4.25V supply voltage range
• Integrates on-board DC-DC converters to generate required RS-232 voltage levels
• Provides a low-power shutdown mode that reduces current consumption to 1µA
• Features three-state receiver outputs allowing multiple receivers to be wire-ORed at the UART

Applications

• Battery-Powered Equipment
• Computers
• Printers
• Peripherals
• Instruments
• Modems

Procurement Notes

Verify the specific ordering suffix 'EPP' corresponds to the 20-pin Plastic DIP package and the industrial temperature range (-40°C to +85°C). Confirm compatibility with the required external components, including a 15µH inductor and specified capacitors, as detailed in the official datasheet. Ensure the application circuit meets the absolute maximum ratings for supply voltages and input/output signals to prevent permanent damage.

Selection Notes

Select the MAX218EPP when designing battery-operated serial communication systems requiring minimal power consumption. This component is suitable for applications needing direct operation from two-cell battery packs without additional regulation. Consider the 120kbps data rate limit and the requirement for external passive components for the internal charge pump. Evaluate the need for the shutdown feature to manage standby power in portable devices effectively.

Part Context

The MAX218 belongs to the Maxim Integrated line of RS-232 transceivers designed for low-voltage, low-power applications. Unlike traditional bipolar RS-232 drivers that require higher supply voltages, this CMOS device utilizes switch-mode power supplies to achieve standard RS-232 levels from a single low-voltage source. It serves as a cost-effective solution for portable electronics where battery life is critical and space for external voltage regulators is limited.

Replacement Considerations

The MAX3218 is a pin-compatible alternative featuring AutoShutdown functionality. Other related parts include the MAX212 and MAX560 series for different interface standards or voltage requirements.