MAX3227EETE+T

Overview

The MAX3227EETE+T is a single-channel, full-duplex RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates on a +3.0V to +5.5V supply and achieves a guaranteed data rate of 1Mbps using MegaBaud technology. The device incorporates AutoShutdown Plus, reducing supply current to 1μA when inputs are inactive for over 30 seconds. It features ±15kV ESD protection via the Human Body Model and IEC 1000-4-2 standards. Packaged in a 16-pin TQFN with an exposed pad, it supports an operating temperature range from -40°C to +85°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by shutting down charge pumps during periods of inactivity.
• Integrated dual charge pump generates internal +5.5V and -5.5V supplies from a single low-voltage source.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events on all I/O lines.

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 'EETE' corresponds to the required 16-TQFN package and tape-and-reel shipping format. Confirm that the 'E' designation matches the -40°C to +85°C industrial temperature range requirements for your target environment before finalizing procurement orders.

Selection Notes

Select this component when designing space-constrained portable electronics requiring true RS-232 signaling at 1Mbps. Ensure the design accommodates four external 0.1μF capacitors for the charge pump circuitry. Verify that the UART logic levels align with the specified input thresholds for reliable signal translation.

Part Context

This part belongs to the MAX3224E through MAX3245E family of RS-232 transceivers. While other members like the MAX3224E offer 2 drivers/receivers or lower data rates, the MAX3227E specifically provides one driver and one receiver optimized for 1Mbps throughput within the same low-power architecture.

Replacement Considerations

The MAX3227EEUE+ serves as a pin-compatible alternative utilizing a TSSOP-16 package instead of the TQFN form factor. Both parts share identical electrical characteristics and functional capabilities within the MAX3227 series.

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 transmitter or receiver input for more than 30 seconds, provided FORCEOFF is high and FORCEON is low.

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 sufficient voltage levels to begin transmitting RS-232 signals.

Can unused transmitter inputs be left floating?

No, unused transmitter inputs should be connected to either GND or VCC to prevent undefined states, as the inputs do not have internal pull-up resistors.