MAX3225EEUP

Overview

The MAX3225EEUP is a dual RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-pin TSSOP package. It operates on a single +3.0V to +5.5V supply and achieves a typical supply current of 1μA using AutoShutdown Plus technology. The device guarantees a data rate of 1Mbps for high-speed applications. It features ±15kV ESD protection on all inputs and outputs per IEC standards. The internal dual charge pump requires only four small 0.1μF capacitors. Operating temperature range is -40°C to +85°C.

Feature Summary

• AutoShutdown Plus feature automatically reduces supply current to 1μA when the cable is disconnected or peripherals are inactive for over 30 seconds.
• Integrated dual charge pump generates required RS-232 voltage levels from a low-voltage supply using minimal external capacitance.
• Enhanced electrostatic discharge protection ensures robustness against air-gap and contact discharge events.

Applications

• Notebook, Subnotebook, and Palmtop Computers
• Cellular Phones
• Battery-Powered Equipment
• Hand-Held Equipment
• Peripherals

Procurement Notes

Verify the specific suffix EEUP corresponds to the 20-pin TSSOP package with an industrial temperature range of -40°C to +85°C. Confirm lead-free/RoHS compliance status based on the '+' designation in the ordering information. Cross-reference the manufacturer's official datasheet to ensure the component matches the exact pinout and electrical specifications required for the design.

Selection Notes

Select this component when a dual driver/receiver configuration is needed alongside high-speed 1Mbps communication capabilities. It is suitable for space-constrained designs requiring low standby power through automatic shutdown mechanisms. Ensure the application environment falls within the specified -40°C to +85°C operating temperature range and utilizes a 3.0V to 5.5V power supply.

Part Context

This part belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E family of RS-232 transceivers. While sharing core features like AutoShutdown Plus and ESD protection, it differs from siblings such as the MAX3224E (250kbps) and MAX3226E (single driver). The MAX3225E specifically provides two drivers and two receivers optimized for higher baud rates compared to the 250kbps variants in the same series.

Replacement Considerations

Public confirmed substitute part numbers: MAX3225EEUE+, MAX3225ECUP+.

FAQ

How does the AutoShutdown Plus feature function?

It monitors receiver and transmitter inputs. If no valid signal transition occurs for more than 30 seconds, the device shuts down the charge pumps and reduces supply current to 1μA. It wakes up upon detecting a valid transition.

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 generated sufficient voltage to begin transmitting. It remains low during shutdown mode.

What external components are required for operation?

Operation requires four small 0.1μF capacitors connected to the charge pump terminals (C1+, C1-, C2+, C2-) to generate the necessary positive and negative voltage rails from the single VCC supply.