MAX13235EAUP+T

Drivers, Receivers, Transceivers Overview

The MAX13235EAUP+T is a dual RS-232 transceiver from the MAX13234E–MAX13237E family, manufactured by Analog Devices Inc./Maxim Integrated. It supports data rates up to 3Mbps and operates on a +3V to +5.5V supply voltage with a separate logic supply (VL) ranging from 1.62V to VCC. The device features AutoShutdown Plus technology, reducing supply current to 1µA when inputs are inactive for over 30 seconds. It includes integrated charge pumps requiring four external 0.1µF capacitors and provides ±15kV HBM ESD protection. Packaged in a 20-pin TSSOP, it functions within a temperature range of -40°C to +85°C.

Drivers, Receivers, Transceivers Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by entering low-power shutdown mode when the interface is idle or disconnected.
• Integrated low-voltage logic interface allows direct connection to ASICs and microcontrollers operating at various logic levels via the VL pin.
• Built-in dual charge-pump circuitry generates required RS-232 voltages using only four small external capacitors.
• Robust electrostatic discharge protection ensures reliability against ±15kV Human Body Model events.

Drivers, Receivers, Transceivers Applications

• Telematics systems
• GPS navigation units
• Industrial control equipment
• Portable electronic devices
• Wireless communication modules

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type and RoHS compliance status. Ensure that the component matches the exact part number specifications before integration into designs. Cross-reference datasheet revision numbers to confirm technical parameters remain consistent with current production standards.

Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring high-speed serial communication with low standby power consumption. The separate logic supply pin enables compatibility with diverse microcontroller voltage levels. Verify that external capacitor values meet minimum requirements for stable charge-pump operation across the intended temperature range.

Drivers, Receivers, Transceivers Part Context

This device belongs to the MAX1323xE series of RS-232 transceivers designed for space-constrained environments. It shares architectural similarities with the MAX13234E, MAX13236E, and MAX13237E, differing primarily in maximum data rate capabilities and driver/receiver configurations within the same package footprint.

Drivers, Receivers, Transceivers Replacement Considerations

Publicly confirmed substitute part numbers include MAX13235EEUP+, MAX13235EETP+, and MAX13237EETE+. Verify electrical characteristics and pinout compatibility before substitution.

Drivers, Receivers, Transceivers FAQ

How does the AutoShutdown Plus feature determine when to enter low-power mode?

The device enters AutoShutdown Plus mode when no valid signal transition is detected on any receiver or transmitter input for more than 30 seconds, shutting down the onboard charge pumps.

What is the purpose of the VL pin on the MAX13235EAUP+T?

The VL pin serves as the logic-level supply input, setting the output voltage levels for receivers and input thresholds for transmitters to match the host system's logic voltage.

Can unused transmitter inputs be left floating?

No, unused transmitter inputs should be connected to GND or VL to prevent undefined states, as the device does not have internal pull-up resistors.