MAX3244CAI+

Overview

The MAX3244CAI+ is a true RS-232 transceiver manufactured by Analog Devices (Maxim Integrated). It operates from a single +3.0V to +5.5V supply and features AutoShutdown Plus technology, achieving a typical 1µA supply current when inactive. The device includes three drivers and five receivers with guaranteed data rates up to 250kbps. It utilizes a dual charge pump requiring only four 0.1µF external capacitors for operation at 3.3V. The component provides ±5V transmitter output swings and incorporates an INVALID signal detector. It is housed in a 28-pin SSOP package.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by disabling the charge pump and transmitters during periods of inactivity or cable disconnection.
• Integrated dual charge pump generates required RS-232 voltage levels using minimal external capacitance.
• INVALID output pin indicates the presence of valid RS-232 signal levels on receiver inputs independent of shutdown states.
• Three-state receiver outputs prevent current flow through peripheral protection diodes during system shutdown.

Applications

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

Procurement Notes

Verify the specific suffix 'CAI+' against the manufacturer's official ordering guide to confirm lead-free compliance and temperature range specifications. Ensure the procurement channel sources directly from authorized distributors to guarantee authenticity. Cross-reference the package type and thermal characteristics with the datasheet before finalizing purchase orders.

Selection Notes

Select this component for applications requiring low-power standby modes in battery-operated systems. The MAX3244 is suitable where 250kbps throughput is sufficient. Consider the MAX3245 if higher speed up to 1Mbps is required. Verify that the system design accommodates the necessary external capacitors for the charge pump circuit.

Part Context

This part belongs to the MAX3224–MAX3245 family of 3V-powered RS-232 transceivers. It shares core architecture with the MAX3224 and MAX3226 but differs in driver/receiver counts and speed capabilities. The family emphasizes power management through AutoShutdown Plus, distinguishing it from standard RS-232 interfaces lacking automatic sleep modes.

Replacement Considerations

The MAX3245 serves as a high-speed alternative within the same family, offering 1Mbps capability. The MAX3224 and MAX3226 are functionally similar regarding the 250kbps rate but may differ in specific pin configurations or packaging options. Verify electrical compatibility before substitution.