MAX3222IDBR

Overview

The MAX3222IDBR is a dual RS-232 transceiver manufactured by Texas Instruments, designed for full-duplex communication on serial ports. It operates within a supply voltage range of 3 V to 5.5 V and supports data rates up to 250 kbps. The device integrates two drivers and two receivers in a 20-pin SSOP package. It utilizes internal charge pumps to generate the necessary voltages for RS-232 signaling from a single power supply. The component complies with EIA/TIA-232-F standards and features Schmitt-trigger inputs on receivers for noise filtering.

Feature Summary

• Integrates dual drivers and dual receivers for complete full-duplex RS-232 communication channels.
• Operates from a single 3 V to 5.5 V power supply using internal charge pump circuitry.
• Includes Schmitt-trigger inputs on receivers to improve noise immunity and signal integrity.
• Provides ESD protection rated at 15 kV according to IEC 61000-4-2 contact discharge standards.

Applications

• Industrial control systems requiring reliable serial communication interfaces.
• Point-of-sale (POS) terminals and handheld data collection devices.
• Medical equipment utilizing serial port connectivity for peripheral integration.
• Embedded systems needing compact full-duplex RS-232 solutions.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Ensure compatibility with system voltage requirements before procurement. Check for RoHS compliance status as manufacturing processes may evolve. Confirm availability through authorized distributors to avoid counterfeit components. Review the latest datasheet for any pinout or functional updates prior to finalizing orders.

Selection Notes

Select this component when a dual-channel RS-232 interface is required within a limited board space. It is suitable for applications operating between 3 V and 5.5 V where external inductors are undesirable. Consider the 250 kbps data rate limit for high-speed serial links. Evaluate the SSOP-20 package constraints against PCB layout capabilities. Compare against higher-speed alternatives if data rates exceed 250 kbps.

Part Context

This part belongs to the MAX3222 family of true RS-232 transceivers. It shares architectural similarities with other members like the MAX3221 and MAX3223 but differs in channel count and speed specifications. The IDBR suffix indicates an industrial temperature range and a tape-and-reel packaging format. It serves as a legacy interface solution in modern embedded designs requiring standard serial connectivity.

Replacement Considerations

MAX3222EIDBR offers improved performance characteristics while maintaining pin compatibility. MAX3222CDBR provides a commercial temperature variant with identical functionality. Verify that substitute parts match the required operating temperature range and package dimensions for direct replacement.

FAQ

What is the maximum data rate supported by the MAX3222IDBR?

The device supports data rates up to 250 kbps.

Does the MAX3222IDBR require external capacitors for its charge pumps?

Yes, it requires four small external capacitors (typically 0.1 µF each) to support the internal charge pump circuitry.

Is the MAX3222IDBR compatible with 3.3 V logic levels?

Yes, the device operates from a single 3 V to 5.5 V supply and is compatible with both 3.3 V and 5 V logic families.