MAX232NS

Overview

The MAX232NS is a dual driver and receiver integrated circuit designed for RS-232 communication, manufactured by Texas Instruments. It operates from a single 5V power supply with a recommended range of 4.5V to 5.5V and features an internal capacitive voltage generator requiring four 1µF external capacitors. The device supports data rates up to 120kbit/s and includes two drivers and two receivers for full-duplex operation. It provides ESD protection exceeding 2000V via the human-body model. The component is housed in a 16-pin SOP (NS) package and functions within an operating temperature range of 0°C to 70°C.

Feature Summary

• Integrates a capacitive voltage generator to produce RS-232 voltage levels from a single 5V supply using only four external capacitors.
• Provides bidirectional level conversion between TTL/CMOS logic levels and TIA/EIA-232-F standard voltages.
• Includes built-in ESD protection that exceeds JESD 22 standards for robust signal integrity.

Applications

• Battery-powered systems
• Terminals
• Modems
• Computers

Procurement Notes

Verify the specific suffix 'NS' corresponds to the SOP-16 package variant when sourcing. Confirm the operational temperature grade matches the application requirements, as this suffix indicates the commercial range. Ensure the supplier provides documentation confirming compliance with the TIA/EIA-232-F standard. Check current production status as legacy interface components may have availability constraints.

Selection Notes

Select the MAX232NS when a single 5V supply is available and low component count is prioritized. This part is suitable for applications requiring up to 120kbit/s transmission speeds. Consider the SOP-16 package dimensions for PCB layout constraints. Verify that the required ESD protection level meets the system's environmental specifications before finalizing the design.

Part Context

The MAX232 series is a foundational component for serial communication interfaces, enabling microcontrollers to connect with standard PC ports. The NS suffix specifically denotes the small-outline package variant. This device simplifies circuit design by eliminating the need for dual polarity power supplies typically required for RS-232 transceivers.

Replacement Considerations

MAX232IDR serves as a direct functional replacement offering an extended industrial temperature range (-40°C to 85°C). MAX202 is an alternative if smaller 0.1µF charge-pump capacitors are preferred over the standard 1µF requirement.