MAX3225EUP+

Overview

The MAX3225EUP+ is a dual driver, dual receiver RS-232 transceiver in a 20-pin TSSOP package. It operates from a single +3.0V to +5.5V supply and achieves a typical supply current of 1µA via AutoShutdown Plus. The device guarantees a maximum data rate of 1Mbps with a propagation delay of 0.15µs. Internal dual charge pumps generate ±5.5V using four external 0.1µF capacitors. It includes a READY output indicating charge pump regulation.

Feature Summary

• AutoShutdown Plus automatically reduces supply current to 1µA when the cable is disconnected or inputs remain inactive for over 30 seconds.
• MegaBaud operation ensures reliable 1Mbps transmission speeds suitable for high-speed peripherals like ISDN modems.
• Integrated logic-level READY output signals when the internal charge pumps are regulating and the device is ready for transmission.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and handheld equipment
• Battery-powered peripherals and printers

Procurement Notes

Verify the specific suffix 'EUP+' against official documentation to confirm lead-free compliance and temperature range specifications. Confirm that the 20-pin TSSOP package matches the target PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component for applications requiring 1Mbps data rates and low-power standby modes. Ensure the design accommodates four external capacitors for the charge pump. Verify that the operating voltage remains within the 3.0V to 5.5V range for proper functionality.

Part Context

This part belongs to the MAX3224–MAX3227 family of EIA/TIA-232 interfaces. It shares features with the MAX3224, MAX3226, and MAX3227 but is distinguished by its guaranteed 1Mbps data rate capability compared to the 250kbps limit of other variants in the series.

Replacement Considerations

Public confirmed substitutes include MAX3225EUP, MAX3225EUE+, and MAX3225CAP+. Verify pinout compatibility and electrical characteristics before substitution.

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 enters a low-power shutdown mode with 1µA supply current. It wakes up upon detecting a valid transition.

What is the purpose of the READY output?

The READY output asserts high when the internal charge pumps are regulating and the device has generated sufficient voltage to begin transmitting. It is low during shutdown mode.

What capacitor values are required for 3.3V operation?

For a 3.3V supply, four external 0.1µF capacitors are required for the charge pump operation (C1–C4).