MAX233AEWP

Overview

The MAX233AEWP+ is a dual RS-232 transceiver from the MAX220–MAX249 family, designed for EIA/TIA-232E and V.28/V.24 interfaces. It operates on a single +5V supply using integrated charge-pump circuitry to generate internal ±10V rails, eliminating external bipolar supplies. The device features two drivers and two receivers with data rates up to 120kbps. It includes a shutdown mode reducing power consumption to 5μW. Packaged in a 20-pin Wide SOIC (SO-20), it supports an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrated charge-pump circuitry eliminates the need for external capacitors or bipolar ±12V supplies.
• Enables single-supply operation from a standard +5V source.
• Includes a low-power shutdown mode for significant energy savings.

Applications

• Interface translation between TTL/CMOS logic and RS-232 signals
• Multidrop RS-232 communication networks
• Portable diagnostic equipment requiring space-constrained designs

Procurement Notes

Verify the specific suffix 'A' indicates the extended temperature grade (-40°C to +85°C) compared to commercial variants. Confirm the package designation matches the 20-pin Wide SOIC footprint. Ensure the component meets RoHS compliance standards required by the target assembly process before finalizing procurement orders.

Selection Notes

Select this component when board space is critical due to the absence of external charge-pump capacitors. Choose this part over the MAX233ACWP if operation in sub-zero environments below 0°C is required. Verify that the 120kbps maximum data rate satisfies the system's baud rate requirements.

Part Context

This component belongs to the Maxim Integrated MAX220–MAX249 family of +5V-powered multichannel RS-232 drivers and receivers. The MAX233 variant specifically provides two drivers and two receivers. The 'A' suffix denotes the industrial temperature rating, distinguishing it from the commercial grade MAX233C.

Replacement Considerations

Direct replacements include the MAX233ACWP for commercial temperature applications. For lead-free versions, consider the MAX233AEWP+G36. Verify pinout compatibility and thermal specifications when substituting.

FAQ

Does the MAX233AEWP require external capacitors?

No, the MAX233 integrates the charge-pump capacitors internally, unlike earlier generations such as the MAX232 which require four external capacitors.

What is the maximum data rate supported?

The datasheet specifies a maximum data rate of 120kbps under normal operating conditions.

How does the shutdown feature function?

Asserting the SHDN pin low disables the transmitter outputs and reduces the supply current to approximately 5μW, significantly lowering power consumption during idle periods.