MAX220CWE

Overview

The MAX220CWE+ is a +5V-powered, multichannel RS-232 driver and receiver from the MAX220–MAX249 family. It operates on a single +5V supply using an integrated charge pump to generate ±10V internal voltages, eliminating the need for external bipolar supplies. The device features one transmitter and one receiver with full-duplex communication capability. It supports data rates up to 200 kbps and includes TTL/CMOS-compatible inputs and outputs. The component is housed in a 16-pin Wide SOIC package and is rated for operation within a temperature range of 0°C to +70°C.

Feature Summary

• Integrated charge pump circuitry enables single-supply +5V operation without requiring external bipolar voltage sources.
• Provides full-duplex RS-232 communication with TTL/CMOS logic compatibility for direct interface with microcontrollers.
• Designed for applications where printed circuit board space is critical due to compact packaging and minimal external component requirements.

Applications

• Interface translation between TTL/CMOS logic levels and RS-232 standards
• Multidrop RS-232 network connections
• Portable diagnostics equipment

Procurement Notes

Verify the specific suffix 'CWE+' against the manufacturer's current ordering guide to confirm the exact package type (Wide SOIC) and commercial temperature grade. Ensure that the required external capacitors match the datasheet specifications for the MAX220 variant, as this part requires discrete components unlike self-contained models in the same family.

Selection Notes

Select the MAX220CWE+ when a single-channel RS-232 transceiver is sufficient for the design. This model requires external capacitors for its charge pump; if zero external components are preferred, consider the MAX225 or MAX233 variants instead. Confirm that the 200 kbps data rate meets the system requirements, as higher-speed options exist within the broader MAX220-MAX249 lineup.

Part Context

The MAX220CWE+ belongs to the MAX220–MAX249 family of line drivers and receivers designed for EIA/TIA-232E and V.28/V.24 interfaces. This family allows for single-supply operation by integrating charge pumps to generate the necessary negative voltages internally. The MAX220 specifically provides one driver and one receiver, making it suitable for basic serial communication tasks where board space and power supply complexity are constraints.

Replacement Considerations

The MAX232CWE+ serves as a functional replacement within the same family, offering identical pinout and electrical characteristics but requiring different external capacitor values (1.0µF vs 0.33µF). Verify that the application can accommodate the specific capacitance requirements of the substitute part.