MAX234CPE+

Overview

The MAX234CPE+ is a +5V-powered, multichannel RS-232 line driver/receiver from the Analog Devices/Maxim Integrated MAX220–MAX249 family. It provides four drivers and zero receivers in a 16-pin PDIP package. The device operates on a single +5V supply (4.5V to 5.5V) using an integrated charge pump to generate ±10V internally, eliminating the need for external bipolar supplies. It supports data rates up to 120kbps with a typical propagation delay of 4µs. The component functions within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Integrated charge pump circuitry eliminates the requirement for external bipolar power supplies
• Enables single-supply operation directly from a +5V source
• Includes shutdown mode functionality to reduce power consumption

Applications

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

Procurement Notes

Verify the specific suffix 'CPE+' against the manufacturer's current ordering information table to confirm the PDIP package and commercial temperature rating. Ensure that the required number of drivers matches the application needs, as this part contains four drivers and no receivers. Cross-reference the datasheet revision date to validate electrical characteristics before finalizing procurement specifications.

Selection Notes

Select this component when a design requires multiple transmit channels but does not need receive functionality. Verify that the system can accommodate the external capacitors required for the charge pump, as the MAX234 does not integrate them internally unlike the MAX233 or MAX235. Confirm that the 120kbps data rate meets the interface requirements and that the 16-pin DIP footprint fits the PCB layout constraints.

Part Context

This device belongs to the MAX220–MAX249 series of +5V-powered RS-232 transceivers. Unlike the MAX232 which offers two drivers and two receivers, the MAX234 variant specifically provides four drivers. This configuration distinguishes it within the family by supporting higher channel density for transmission while omitting receiver circuits entirely.

Replacement Considerations

The MAX232CPE+ serves as a functional substitute if only two transmit channels are required. For applications needing integrated capacitors, the MAX233CPE+ is an alternative, though it provides fewer drivers. Verify pin compatibility and capacitor requirements when substituting.