MAX3226ECTE+

Overview

The MAX3226ECTE+ is a single-channel RS-232 transceiver manufactured by Analog Devices (Maxim Integrated). It operates on a +3.0V to +5.5V supply and guarantees a data rate of 250kbps. The device features AutoShutdown Plus technology, reducing supply current to 1μA when idle. It includes ±15kV ESD protection on all I/O pins. The component is housed in a 16-pin TQFN package with an exposed pad (TQFN-EP-16) and supports an operating temperature range of 0°C to +70°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption during periods of inactivity or cable disconnection.
• Integrated dual charge pump generates internal voltage rails from a single low-voltage supply.
• Robust electrostatic discharge protection ensures signal integrity across transmitter outputs and receiver inputs.

Applications

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

Procurement Notes

Verify the specific suffix 'ECTE+' against official manufacturer documentation to confirm the exact pinout, thermal pad configuration, and lead-free status. Ensure the selected variant matches the required operating temperature range and package dimensions for your PCB layout constraints.

Selection Notes

Select this component for applications requiring minimal standby power without BIOS modifications. The MAX3226E variant provides 250kbps throughput; choose the MAX3227E if 1Mbps operation is necessary. Confirm that the 16-pin TQFN footprint aligns with available board space and thermal dissipation requirements.

Part Context

This part belongs to the MAX3224E through MAX3245E family of RS-232 transceivers. While sharing core features like AutoShutdown Plus and ESD protection, variants differ in driver/receiver counts and maximum data rates. The MAX3226E specifically offers one driver and one receiver at 250kbps.

Replacement Considerations

The MAX3227ECTE+ serves as a direct functional substitute within the same package, offering identical pinouts but supporting 1Mbps data rates instead of 250kbps.

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, such as when the cable is disconnected or the UART is 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 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 pullup resistors.