MAX3222IDB

Overview

The MAX3222IDB is a multichannel RS-232 line driver and receiver manufactured by Texas Instruments. It operates from a single 3-V to 5.5-V power supply and features two drivers and two receivers, supporting full-duplex communication. The device complies with EIA/TIA-232-F and V.28/V.10 standards. It utilizes small external capacitors for charge pump functionality and includes a shutdown mode to minimize power consumption during idle periods. The component is housed in a 20-pin SSOP package and is rated for an operating temperature range of -40°C to +85°C.

Feature Summary

• Supports data rates up to 30 kbps for reliable serial communication
• Integrates dual charge pumps requiring only four 0.1-uF external capacitors
• Includes a low-power shutdown mode controlled by the SLEEP pin
• Provides ±15-kV electrostatic discharge protection on all RS-232 lines

Applications

• Portable battery-powered equipment such as laptops and palmtop computers
• Modems and fax machines requiring RS-232 connectivity
• Industrial control systems utilizing serial communication protocols
• Point-of-sale (POS) terminals and handheld data collection devices

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and tape-and-reel specifications. Ensure compliance with RoHS directives if required for the target market. Cross-reference the part number with official distributors to confirm availability status and lead times prior to finalizing procurement plans.

Selection Notes

Select this component when designing circuits that require two independent RS-232 channels within a compact footprint. It is suitable for applications needing low standby current due to its integrated shutdown feature. Verify that the system voltage falls within the 3-V to 5.5-V range and that the required data rate does not exceed 30 kbps for optimal performance.

Part Context

This device belongs to the MAX32xx family of RS-232 transceivers designed for low-voltage operation. Unlike older 5-V-only transceivers, it supports modern 3-V logic systems while maintaining compatibility with standard RS-232 signal levels. The IDB suffix indicates a 20-lead shrink small-outline package (SSOP), distinguishing it from wider SOIC or DIP variants in the same series.

Replacement Considerations

The SN75C3222IDR is a documented equivalent offering similar functionality and pinout compatibility. Other alternatives include the MAX3222EIDBR for extended industrial temperature ranges or different packaging options. Verify electrical characteristics and pin assignments before substituting.