MAX3226ECAE+

Overview

The MAX3226ECAE+ is a single-driver, single-receiver RS-232 transceiver manufactured by Analog Devices Inc. (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 per IEC standards and provides a READY output pin indicating charge pump regulation status. The component is housed in a 16-pin SSOP package and supports an operating temperature range from -40°C to +85°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 using only four small external capacitors.
• 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 such as printers

Procurement Notes

Verify the specific ordering suffix 'CAE' against official manufacturer documentation to confirm the exact package type and temperature grade. Confirm RoHS compliance status for the lead-free variant. Ensure the selected distributor sources directly from authorized channels to guarantee component authenticity and traceability.

Selection Notes

Select this component for applications requiring a single full-duplex RS-232 channel with low standby power. It is suitable for systems where automatic power management is required without BIOS modifications. Consider alternative models within the family if higher data rates or additional driver/receiver counts are necessary.

Part Context

This part belongs to the MAX3224E through MAX3245E family of 3V-powered RS-232 transceivers. The family shares common features like AutoShutdown Plus and ESD protection but varies in driver/receiver counts and maximum guaranteed data rates. The MAX3226E specifically provides one transmitter and one receiver at 250kbps.

Replacement Considerations

Direct functional replacements within the same series include the MAX3224E (2 drivers/2 receivers) and MAX3227E (1 driver/1 receiver, 1Mbps). Verify pinout compatibility and thermal characteristics before substituting.

FAQ

How does the AutoShutdown Plus feature operate?

The device enters a low-power shutdown mode when the RS-232 cable is disconnected or all inputs remain inactive for more than 30 seconds. It wakes up upon sensing a valid transition at any input.

What is the function of the READY output pin?

The READY output asserts high when the internal charge pumps are regulating and the device is ready to begin transmitting. It goes low when the device is in shutdown mode.

What external components are required for operation?

Operation requires four small capacitors (typically 0.1μF) connected to the charge pump terminals to generate the internal positive and negative voltage rails.