MAX218CWP+

Drivers, Receivers, Transceivers Overview

The MAX218CWP+ is a true RS-232 dual transceiver manufactured by Analog Devices Inc./Maxim Integrated, designed for battery-powered EIA/TIA-232E and V.28/V.24 communications interfaces requiring minimal power consumption. It features two drivers and two receivers operating within a wide +1.8V to +4.25V supply voltage range while maintaining standard RS-232 voltage levels. The device supports a guaranteed data rate of 120kbps and includes an onboard DC-DC converter that generates ±6.5V from the single low-voltage input. It operates in a 20-pin Wide SO package with an industrial temperature range of 0°C to +70°C.

Drivers, Receivers, Transceivers Feature Summary

• Operates directly from two alkaline, NiCd, or NiMH cells without external voltage regulators
• Integrates onboard switch-mode DC-DC converters to generate required RS-232 voltages
• Provides a low-power shutdown mode reducing current consumption to 1µA
• Features three-state receiver outputs allowing multiple ports to be wire-ORed at the UART

Drivers, Receivers, Transceivers Applications

• Battery-powered equipment
• Portable computers and peripherals
• Printers and instruments
• Modems

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'CWP+' against the official datasheet to confirm the 20-pin Wide SO package and 0°C to +70°C temperature range. Ensure compatibility with the required external components, specifically a 15µH inductor and fast recovery diode, as these are mandatory for the internal charge pump operation. Confirm lead availability through authorized distributors given the component's age.

Drivers, Receivers, Transceivers Selection Notes

Select this component when designing portable systems powered by two series cells (alkaline, NiCd, or NiMH) where minimizing power consumption is critical. It is suitable for applications requiring direct interface with 3V logic while maintaining true RS-232 signaling. Consider the MAX3218 if an automatic shutdown feature upon serial idle detection is preferred over manual control via the SHDN pin.

Drivers, Receivers, Transceivers Part Context

The MAX218 belongs to the Maxim Integrated line of low-power RS-232 transceivers. It serves as a cost-effective alternative to bipolar RS-232 drivers by eliminating the need for negative supply rails or complex regulator circuits. The device is part of a family including the MAX212 and MAX3218, distinguished by its ability to run directly from unregulated battery sources using an integrated inductive charge pump.

Drivers, Receivers, Transceivers Replacement Considerations

MAX3218CAP+T: Pin-compatible upgrade featuring AutoShutdown functionality.