MAX3226CAE+

Overview

The MAX3226CAE+ is a single-driver, single-receiver RS-232 transceiver from the MAX3225 family. It operates on a +3.0V to +5.5V supply and achieves a typical 1µA supply current via AutoShutdown Plus. The device guarantees a maximum data rate of 250kbps with full-duplex communication. It utilizes a dual charge pump requiring four 0.1µF capacitors for operation at 3.3V. Key features include a READY output indicating charge pump regulation, an INVALID signal detector, and SSOP-16 packaging.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption when inputs are inactive
• Integrated dual charge pump generates required RS-232 voltages using minimal external components
• READY output indicates when the internal voltage regulators are active and ready for transmission
• INVALID output detects valid RS-232 signal levels on receiver inputs

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and handheld equipment
• Battery-powered peripherals and printers

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and temperature range. Confirm RoHS compliance status through manufacturer datasheets or authorized distributor declarations. Ensure the ordering information matches the exact functional requirements before procurement.

Selection Notes

Select this component for applications requiring low-power RS-232 interfaces in battery-operated devices. Verify that the 250kbps data rate meets system requirements, as higher-speed variants exist within the same family. Ensure the design accommodates the necessary external capacitors for the charge pump circuit.

Part Context

This part belongs to the MAX3224–MAX3227/MAX3244/MAX3245 series of 3V-powered EIA/TIA-232 communications interfaces. These devices share common features like AutoShutdown Plus and MegaBaud capabilities across different driver/receiver configurations.

Replacement Considerations

MAX3224CAE+ (2 drivers), MAX3225CAE+ (1 driver, 1Mbps)

FAQ

How does the AutoShutdown Plus feature function?

It automatically enters a low-power shutdown mode when the RS-232 cable is disconnected or transmitter/receiver inputs remain inactive for more than 30 seconds.

What is the purpose of the READY output?

The READY output asserts high when the charge pump is regulating and the device is ready to begin transmitting.

What external components are required for the charge pump?

Four small 0.1µF capacitors are required for operation from a 3.3V supply.