MAX3243CAI+

Overview

The MAX3243CAI+ is a multichannel RS-232 transceiver featuring three drivers and five receivers in a 28-pin SSOP package. It operates from a single +3.0V to +5.5V supply, utilizing an internal dual charge pump to generate ±5.5V for RS-232 signaling without external high-voltage sources. The device supports data rates up to 120kbps under worst-case loading conditions (3kΩ parallel with 1000pF) and typically reaches 235kbps. It incorporates AutoShutdown technology, reducing supply current to 1µA when no valid signal is detected on receiver inputs for 30µs. The component includes an always-active complementary receiver output for monitoring during shutdown.

Feature Summary

• AutoShutdown functionality automatically powers down the onboard charge pump and drivers upon detecting invalid receiver input levels, significantly reducing standby power consumption.
• Integrated dual charge-pump voltage converter eliminates the need for external ±12V supplies by generating required voltages directly from a single low-voltage source.
• Complementary always-active receiver output allows continuous monitoring of RS-232 activity even when the main transceivers are disabled or in shutdown mode.

Applications

• Battery-powered equipment requiring extended standby life
• Hand-held devices and portable diagnostics equipment
• Peripherals connecting to PC serial ports

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature range. Ensure the procurement channel provides traceable components matching the Analog Devices/Maxim Integrated specifications. Cross-reference the part number with the latest datasheet revision to confirm RoHS compliance status and pinout compatibility before finalizing orders.

Selection Notes

Select this component for applications requiring low-power RS-232 communication from a single 3.3V or 5V logic supply. The MAX3243CAI+ is suitable where minimal external capacitance (0.1µF) is preferred and automatic power-down features are necessary. Consider the 28-pin SSOP footprint constraints and ensure the system design accommodates the required charge-pump capacitors for stable operation.

Part Context

This device belongs to the MAX3221/MAX3223/MAX3243 family of low-power RS-232 transceivers. While sharing core architecture and AutoShutdown capabilities, it differs from siblings like the MAX3221 (1 driver/1 receiver) and MAX3223 (2 drivers/2 receivers) by offering higher channel density. The 'C' designation indicates commercial temperature range operation, distinguishing it from the industrial-rated 'E' variants.

Replacement Considerations

Public confirmed substitute part numbers include V62/06624-01YE and V62-06624-01YE, which are enhanced product versions available from Texas Instruments. These alternatives maintain similar functional characteristics but may differ in specific manufacturing processes or reliability ratings.