MAX3212CWI

Overview

The MAX3212CWI is a +2.7V to +3.6V-powered, true RS-232 transceiver featuring three drivers and five receivers in a 28-pin Wide SO package. It operates within an industrial temperature range of 0°C to +70°C. The device utilizes a proprietary AutoShutdown mode to reduce supply current to 1µA when valid signal levels are absent. It guarantees a data rate of 235kbps and meets EIA/TIA-232E and EIA/TIA-562 specifications. The internal switch-mode power supply generates ±6.5V from the single low-voltage input using external components.

Feature Summary

• Proprietary AutoShutdown circuitry reduces supply current to 1µA by disabling the onboard power supply and drivers when no valid RS-232 signal is detected on receiver inputs.
• Integrated switch-mode power supply generates required ±6.5V for true RS-232 levels from a single 2.7V to 3.6V supply using minimal external components.
• Guaranteed mouse driveability allows direct powering of serial mice while operating from low-voltage supplies, maintaining output voltage levels under load.
• Complementary receiver output (R5OUTB) remains always active to monitor incoming RS-232 activity even when other receivers are disabled or in shutdown state.

Applications

• Notebook and palmtop computers
• Battery-powered equipment
• Peripherals and instruments

Procurement Notes

Verify the specific suffix 'W' corresponds to the 28-pin Wide SO package and the 'C' indicates the 0°C to +70°C temperature range. Confirm that the ordering information matches the manufacturer's current datasheet revision, as component availability and exact pinout details should be cross-referenced with official documentation before integration into final designs.

Selection Notes

Select this component for applications requiring low-voltage operation between 2.7V and 3.6V with significant power savings during idle periods. It is suitable for systems needing three transmit and five receive channels. Ensure the design accommodates the external inductor and diodes required for the charge pump. Verify compatibility with 5V logic families if interfacing directly with higher voltage digital circuits.

Part Context

The MAX3212 belongs to Maxim Integrated's family of +3V-powered RS-232 transceivers designed for portable electronics. It distinguishes itself through the inclusion of AutoShutdown technology and guaranteed mouse driveability, addressing power constraints in battery-operated devices. The C-series variant specifically targets commercial temperature environments, offering a balance between performance and cost for standard consumer applications.

Replacement Considerations

The MAX3243 serves as a compatible alternative within the same product family, offering similar functionality but operating from a 3.0V to 5.5V supply range. Designers must verify pinout compatibility and ensure the replacement supports the required voltage levels and interface standards for the specific application context.