MAX3221ECDB

Overview

The MAX3221ECDB is a single-channel RS-232 line driver and receiver manufactured by Texas Instruments. It operates from a single 3-V to 5.5-V supply and includes internal charge pumps to generate the required ±5.5-V signals for EIA/TIA-232-F and V.28/V.24 compatibility. The device features a low-power shutdown mode that reduces supply current to less than 1 μA. It provides ±15-kV electrostatic discharge (ESD) protection on all RS-232 lines, ensuring robust operation in harsh environments. The component is housed in a 16-pin SSOP package.

Feature Summary

• Integrated charge pump eliminates external capacitors for voltage generation
• Low-power shutdown mode significantly reduces standby current consumption
• High ESD protection rating ensures reliability against electrostatic discharges
• Single-supply operation simplifies power design requirements

Applications

• Point-to-point serial communication links
• Modem interfacing
• Portable instrumentation data transmission
• Industrial control systems requiring RS-232 connectivity

Procurement Notes

Verify the specific suffix 'E' indicates the industrial temperature range (-40°C to +85°C) as per Texas Instruments documentation. Confirm the package type is SSOP-16. Check for RoHS compliance status and lead-free markings on the component body or datasheet revision history to ensure adherence to current environmental regulations before procurement.

Selection Notes

Select this component when a single transmitter and receiver are needed for RS-232 communication with minimal external components. It is suitable for applications requiring low standby power due to the shutdown feature. Ensure the operating environment falls within the specified temperature range for the 'E' grade variant. Compare with SN75C3221 if commercial temperature range suffices.

Part Context

The MAX3221 belongs to the family of true 3-V to 5.5-V RS-232 transceivers. It is functionally similar to the MAX3222 but offers only one driver and receiver instead of two. The 'ECDB' designation specifies the industrial temperature grade and SSOP packaging. This part is widely used in legacy serial interface designs where space and power efficiency are critical constraints.

Replacement Considerations

The SN75C3221 is a pin-compatible alternative with a commercial temperature range. The MAX3222 offers identical functionality but includes two drivers and receivers. Verify pinout compatibility and thermal specifications when substituting these parts.