MAX3311ECUB+T

Overview

The MAX3311ECUB+T is a low-power, single-channel RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a +5V supply and supports data rates up to 460kbps while maintaining EIA/TIA-232-compatible output levels. The device integrates a single inverting charge pump requiring only three 0.1µF capacitors for operation. It features ±15kV Human Body Model ESD protection on all I/O pins. The ECUB suffix indicates an industrial temperature range of 0°C to +70°C. Key electrical parameters include a typical supply current of 250µA during active mode and a shutdown current of 1µA when the SHDN pin is grounded.

Feature Summary

• Integrates a proprietary low-dropout transmitter output stage enabling full RS-232 compatibility from a single +5V supply.
• Provides robust ±15kV electrostatic discharge (ESD) protection on both transmitter outputs and receiver inputs using the Human Body Model.
• Features a dedicated shutdown mode that disables the charge pump and transmitter, reducing power consumption to approximately 1µA.
• Maintains receiver functionality even when the device is placed in shutdown mode.

Applications

• Digital Cameras
• Personal Digital Assistants (PDAs)
• Global Positioning Systems (GPS)
• Point-of-Sale (POS) terminals
• Telecommunications equipment

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm the exact temperature grade and package variant. Confirm RoHS compliance status through the latest datasheet revision or manufacturer certification documents before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring minimal external capacitance and low standby power consumption. Ensure the operating environment remains within the 0°C to +70°C range specified for the C-series devices. Verify that the system logic levels are compatible with the TTL/CMOS input requirements of the transceiver.

Part Context

This part belongs to the MAX3311E/MAX3313E family of low-power RS-232 transceivers. The MAX3311E variant includes a shutdown control pin, whereas the MAX3313E variant replaces the shutdown pin with an INVALID signal detector output. Both share identical core electrical characteristics and physical packaging dimensions.

Replacement Considerations

Direct pin-compatible replacements within the same series include the MAX3311EEUB for extended temperature ranges. Cross-family comparisons should focus on ESD ratings and supply voltage compatibility rather than assuming functional equivalence across different Maxim interface families.

FAQ

Does the receiver remain operational when the device is in shutdown mode?

Yes, the MAX3311E receiver remains active during shutdown mode, allowing it to detect incoming signals even when the transmitter and charge pump are disabled.

What is the maximum data rate supported by the MAX3311ECUB+T?

The device supports data rates up to 460kbps while maintaining RS-232-compatible output voltage levels under worst-case load conditions.

How many external capacitors are required for proper operation?

Only three 0.1µF capacitors are required: one for the positive charge pump terminal, one for the negative charge pump terminal, and one for bypassing the VCC supply.