MAX13234EETP+T

Drivers, Receivers, Transceivers Overview

The MAX13234EETP+T is a dual-driver, dual-receiver RS-232 transceiver in a 20-pin TQFN-EP package. It supports data rates up to 250kbps and operates from a +3V to +5.5V supply voltage. The device features an integrated low-voltage logic interface (VL) ranging from 1.62V to VCC for direct connection to microcontrollers. Supply current drops to 1µA in AutoShutdown Plus mode when inputs are inactive for over 30 seconds. It includes ±15kV HBM ESD protection on receiver inputs and transmitter outputs.

Drivers, Receivers, Transceivers Feature Summary

• AutoShutdown Plus technology automatically reduces power consumption by shutting down charge pumps when the cable is disconnected or inputs remain idle for more than 30 seconds.
• Integrated low-voltage logic interface allows flexible interfacing with ASICs and microcontrollers operating at various logic levels between 1.62V and VCC.
• Built-in dual charge-pump circuitry generates required RS-232 voltages using only four external capacitors, eliminating the need for external voltage converters.

Drivers, Receivers, Transceivers Applications

• Telematics systems
• GPS modules
• Industrial control equipment
• Point-of-sale (POS) terminals

Drivers, Receivers, Transceivers Procurement Notes

Verify that the component matches the specific 20-pin TQFN-EP package configuration. Confirm the suffix indicates lead-free and RoHS compliance. Ensure the ordering code corresponds to the 250kbps speed variant rather than the 3Mbps family members. Check datasheet specifications for thermal resistance values relevant to your PCB layout.

Drivers, Receivers, Transceivers Selection Notes

Select this part when a dual-channel RS-232 interface is required within a compact surface-mount footprint. It is suitable for designs needing low standby power through automatic shutdown features. Choose this model over higher-speed variants if the application does not require data rates exceeding 250kbps. Ensure the host system provides a separate VL supply rail compatible with the logic thresholds.

Drivers, Receivers, Transceivers Part Context

This component belongs to the MAX1323xE family of high-speed RS-232 transceivers. It shares functional similarities with the MAX13235E but offers a lower maximum data rate of 250kbps compared to the 3Mbps capability of other family members. The device utilizes Maxim's proprietary AutoShutdown Plus architecture to optimize power efficiency in portable applications.

Drivers, Receivers, Transceivers Replacement Considerations

The MAX13234EEUP+T serves as a pin-compatible alternative in a 20-pin TSSOP package. For single-channel requirements, the MAX13237E series provides comparable functionality with reduced pin count. Verify that substitute components maintain the same exposed pad thermal characteristics and low-voltage logic interface capabilities.

Drivers, Receivers, Transceivers FAQ

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

The device enters AutoShutdown Plus mode when it detects no valid signal transitions on any receiver or transmitter input for more than 30 seconds. This typically occurs when the RS-232 cable is disconnected or the driving host is inactive.

What is the purpose of the VL pin on the MAX13234EETP+T?

The VL pin provides a separate logic supply input that sets the threshold levels for receiver outputs and transmitter inputs. This allows the transceiver to interface directly with host devices operating at logic voltages as low as 1.62V.

Can the MAX13234EETP+T operate without external capacitors?

No, the internal charge pump requires four external capacitors (C1–C4) to generate the positive and negative RS-232 supply voltages. A minimum capacitance value must be used depending on the VCC supply voltage.