MAX3244ECWI+G1Z

Overview

The MAX3244ECWI+G1Z is a 3V-powered RS-232 transceiver featuring AutoShutdown Plus technology. It provides three drivers and five receivers with full-duplex communication capability, guaranteeing a data rate of 250kbps. The device operates on a single +3.0V to +5.5V supply and achieves a typical supply current of 1μA in shutdown mode. It includes ±15kV ESD protection on all I/O pins and utilizes a dual charge pump requiring four 0.1μF capacitors. The component is housed in a 28-pin Wide SOIC package and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption when the interface is idle or disconnected.
• Integrated dual charge pump generates internal voltage rails for true RS-232 signaling from low-voltage supplies.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events.

Applications

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

Procurement Notes

Verify the specific suffix 'G1Z' against official manufacturer documentation to confirm lead-free status and RoHS compliance details. Ensure the ordering code matches the exact pinout and thermal specifications required for your PCB layout. Cross-reference the datasheet revision date to confirm the validity of the electrical characteristics provided.

Selection Notes

Select this component for applications requiring multiple receiver lines alongside standard transmitter outputs. The 250kbps data rate suits general-purpose serial communications where higher speeds are unnecessary. Consider the 28-pin Wide SOIC package dimensions during mechanical design to ensure adequate clearance and solderability.

Part Context

This part belongs to the MAX3224E through MAX3245E family of RS-232 transceivers. It shares core features like AutoShutdown Plus and ESD protection with siblings such as the MAX3245E, which offers higher speed capabilities. The ECWI variant specifically denotes the industrial temperature range and the wide SOIC packaging format.

Replacement Considerations

The MAX3245E serves as a direct functional substitute within the same series, offering identical pinouts but supporting up to 1Mbps data rates. Verify that the increased speed capability does not impact system timing requirements when making this substitution.

FAQ

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

The device enters shutdown mode if no valid signal transition is detected on any receiver or transmitter input for more than 30 seconds. It wakes up upon sensing a valid transition at any input.

What is the function of the R2OUTB pin on the MAX3244E?

R2OUTB is an always-active, noninverting complementary receiver output. It allows monitoring of receiver activity while other receivers are in a high-impedance state, preventing forward biasing of connected devices.

Can unused transmitter inputs be left floating?

No, unused transmitter inputs should be connected to GND or VCC. They do not have internal pull-up resistors.