MAX3243CAI+TG1Z

Overview

The MAX3243CAI+TG1Z is a 3-driver, 5-receiver RS-232 transceiver in a 28-pin SSOP package. It operates from a single +3.0V to +5.5V supply and achieves 1µA supply current via AutoShutdown when no valid signal is detected on receiver inputs for 30µs. The device guarantees a 120kbps data rate with worst-case loads of 3kΩ parallel 1000pF, typically supporting up to 235kbps. It includes an always-active complementary receiver output (R2OUTB) for external monitoring during shutdown. Operating temperature range is 0°C to +70°C.

Feature Summary

• AutoShutdown feature reduces supply current to 1µA by disabling the onboard power supply and drivers when no valid RS-232 signal is present on receiver inputs for 30µs.
• Integrated dual charge-pump circuitry generates ±5.5V from a single +3.0V to +5.5V supply, eliminating the need for external ±12V sources.
• Complementary R2OUTB receiver remains active during shutdown to monitor external devices without forward-biasing connected logic.

Applications

• Battery-powered equipment
• Hand-held equipment
• Portable diagnostics equipment

Procurement Notes

Verify the specific suffix 'TG1Z' against official manufacturer documentation to confirm RoHS compliance and lead-free status. Confirm that the 'C' designation corresponds to the commercial temperature range of 0°C to +70°C. Ensure the SSOP-28 package matches the design footprint requirements before finalizing procurement.

Selection Notes

Select this component for applications requiring low-power standby modes where cable disconnection detection is necessary. The MAX3243 variant provides three drivers and five receivers, suitable for complex serial interfaces. Verify that the required data rate does not exceed 235kbps under typical conditions and that the load capacitance remains within specified limits for optimal performance.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of 3V-powered RS-232 transceivers. The MAX3243 specifically offers 3 drivers and 5 receivers in a 28-pin package. The 'C' indicates the commercial temperature range, while 'E' denotes extended range. The 'AI' suffix specifies the SSOP-28 package type.

Replacement Considerations

MAX3243EAI+ is the extended temperature version (-40°C to +85°C) in the same SSOP-28 package. MAX3243CUI+ offers the same electrical characteristics in a TSSOP-28 package. Direct pin-compatible replacements require matching driver/receiver counts and voltage ranges.