MAX3224EEUP+

Overview

The MAX3224EEUP+ is a dual-channel RS-232 transceiver manufactured by Analog Devices (Maxim Integrated). It operates on a single +3.0V to +5.5V supply and features AutoShutdown Plus technology, achieving a typical supply current of 1μA when inactive. The device guarantees a data rate of 250kbps with ±5V transmitter output swings. It includes an internal dual charge pump requiring four 0.1μF capacitors for operation. ESD protection is rated at ±15kV via the Human Body Model and ±8kV via Contact Discharge. The component is housed in a 20-pin TSSOP package and supports an industrial temperature range from -40°C to +85°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by shutting down internal charge pumps during periods of inactivity.
• Integrated dual charge pump generates required positive and negative voltage rails directly from a single low-voltage supply.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events on all I/O pins.

Applications

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

Procurement Notes

Verify the specific suffix 'EEUP+' corresponds to the 20-pin TSSOP package and the -40°C to +85°C extended temperature range. Confirm RoHS compliance status indicated by the '+' designation. Ensure the source document matches the official Analog Devices datasheet for the MAX3224E series to validate pinout and electrical specifications before procurement.

Selection Notes

Select this component for applications requiring low-power standby modes without BIOS modifications. Choose the MAX3224E variant specifically if a guaranteed 250kbps data rate is sufficient; opt for the MAX3225E if 1Mbps speeds are required. Verify that the 20-pin TSSOP footprint fits the design constraints compared to SSOP or TQFN alternatives.

Part Context

This part belongs to the MAX3224E through MAX3245E family of 3V RS-232 transceivers. While sharing the same core AutoShutdown Plus architecture and ESD protection levels, variants differ in channel count and maximum data rates. The MAX3224E specifically provides two drivers and two receivers, distinguishing it from the higher-capacity MAX3244E.

Replacement Considerations

The MAX3225EEUP+ serves as a direct functional substitute offering increased speed capability up to 1Mbps while maintaining identical pinouts and package dimensions.

FAQ

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

The device enters shutdown mode when no valid signal transition is detected on any receiver or transmitter input for more than 30 seconds, typically occurring when the cable is disconnected or peripherals are inactive.

What is the function of the READY output pin?

The READY output asserts high when the internal charge pumps are regulating and the device has reached stable operating voltages, indicating it is ready to begin transmitting data.

Can unused transmitter inputs be left floating?

No, unused transmitter inputs should not be left floating. They must be connected to either Ground (GND) or VCC to prevent undefined states.