MAX3221EIDYYR

Overview

The MAX3221EIDYYR is a single-channel RS-232 transceiver manufactured by Texas Instruments, designed for operation with supply voltages ranging from 3 V to 5.5 V. It integrates one driver and one receiver within a compact SOT-23-THIN-14 package. The device supports data rates up to 250 kbps and features low power consumption with an operating supply current of 1 µA in shutdown mode. It provides ±15-kV electrostatic discharge (ESD) protection on the RS-232 lines and includes internal charge pumps that eliminate the need for external capacitors in some configurations, though standard designs typically utilize small external capacitors. The component operates over an extended temperature range from -40°C to +85°C.

Feature Summary

• Single-channel RS-232 line driver and receiver compatible with EIA/TIA-232-F standards
• Integrated charge pump circuitry for generating required voltage levels without external inductors
• High electrostatic discharge protection rated at ±15 kV on transmit and receive lines
• Low power consumption with automatic shutdown feature to minimize current draw during idle periods

Applications

• Portable equipment requiring serial communication interfaces
• Modems and fax machines
• Handheld terminals and industrial control systems
• Communication modules in battery-powered devices

Procurement Notes

Verify the specific suffix IDYYR corresponds to the SOT-23-THIN-14 package and tape-and-reel packaging configuration. Confirm RoHS compliance status and ensure the manufacturer source is Texas Instruments or an authorized distributor. Check for any specific handling requirements related to the thin package format during assembly.

Selection Notes

Select this component when a single full-duplex RS-232 channel is required in a minimal footprint. It is suitable for applications needing low standby current due to its shutdown capability. Ensure the design accommodates the necessary external capacitors for the charge pump if not using a variant with integrated capacitors. Verify that the 250 kbps data rate meets the system's communication speed requirements.

Part Context

The MAX3221 series belongs to Texas Instruments' family of true 3-V to 5.5-V RS-232 transceivers. These devices are engineered to provide reliable communication in low-voltage environments where traditional 5-V parts may not function correctly. The EIDYYR variant specifically denotes the industrial temperature grade and the thin SOT-23 packaging, distinguishing it from other pinout or package options in the broader MAX322x lineup.

Replacement Considerations

Direct replacements include the MAX3221EIDY and MAX3221EIR. Other compatible single-channel RS-232 transceivers from Texas Instruments such as the SN75C3221 may be considered if pin compatibility and electrical specifications align with the existing design constraints.