MAX3225EEUP+T

Overview

The MAX3225EEUP+T is a dual RS-232 transceiver in a 20-pin TSSOP package, designed for EIA/TIA-232 and V.28/V.24 communications. It operates on a single +3.0V to +5.5V supply and guarantees a data rate of 1Mbps. The device incorporates AutoShutdown Plus technology, reducing supply current to 1μA when inputs remain inactive for over 30 seconds. All transmitter outputs and receiver inputs feature ±15kV IEC 1000-4-2 air-gap discharge electrostatic discharge protection. Internal dual charge pumps generate the required voltage levels using four small external capacitors.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by shutting down internal charge pumps during periods of inactivity.
• Enhanced electrostatic discharge protection ensures robust signal integrity across all transmitter and receiver interfaces.
• Integrated dual charge pump architecture enables true RS-232 performance from low-voltage single-supply sources.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and battery-powered equipment
• Hand-held devices and peripherals

Procurement Notes

Verify the specific suffix EEUP+T against official manufacturer documentation to confirm the industrial temperature range (-40°C to +85°C) and tape-and-reel packaging format. Confirm lead-free and RoHS compliance status directly with the supplier or manufacturer before finalizing procurement orders.

Selection Notes

Select this component for applications requiring high-speed 1Mbps communication within space-constrained designs. Ensure the system design accommodates the necessary four external 0.1μF capacitors for the charge pump operation. Verify that the UART interface logic levels are compatible with the specified input thresholds.

Part Context

This part belongs to the MAX3224E through MAX3245E family of RS-232 transceivers. While sharing core features like AutoShutdown Plus and ESD protection, it is distinguished by its 1Mbps data rate capability and dual driver/receiver configuration. Other family members offer varying rates and channel counts to suit different interface requirements.

Replacement Considerations

The MAX3225ECUP+ serves as a commercial-grade alternative with an operating range of 0°C to +70°C. For systems requiring higher data rates, the MAX3245E provides three drivers and five receivers at 1Mbps. Lower speed alternatives include the MAX3224E and MAX3226E, which guarantee 250kbps operation.

FAQ

How does the AutoShutdown Plus feature function?

The device enters a low-power shutdown mode when all receiver and transmitter inputs remain inactive for more than 30 seconds. It automatically wakes up upon detecting a valid transition on any input.

What is the purpose of the READY output pin?

The READY output asserts high when the internal charge pumps are regulating and the device has reached the necessary voltage levels to begin transmitting RS-232 signals.

How many external capacitors are required for operation?

Four small capacitors are required to support the dual charge pump circuitry. Typically, 0.1μF capacitors are used for operation from a 3.3V supply.