MAX3245EEWI+

Overview

The MAX3245EEWI+ is a full-duplex RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +3.0V to +5.5V supply and features three drivers and five receivers. The device guarantees a data rate of 1Mbps using MegaBaud technology. It incorporates AutoShutdown Plus, which reduces the supply current to 1μA when inputs are inactive for over 30 seconds. ESD protection is rated at ±15kV (Air-Gap), ±8kV (Contact), and ±15kV (Human Body Model). The component is housed in a 28-pin Wide SOIC package and supports an industrial operating temperature range from -40°C to +85°C.

Feature Summary

• AutoShutdown Plus functionality automatically enters low-power shutdown mode upon cable disconnection or prolonged input inactivity, resuming operation upon valid signal detection without BIOS modifications.
• Integrated dual charge pump generates internal +5.5V and -5.5V supplies from a single low-voltage source, requiring only four small capacitors for operation.
• Enhanced I/O protection safeguards transmitter outputs and receiver inputs against high-energy electrostatic discharge events.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and battery-powered equipment
• Hand-held devices and peripherals such as printers
• Automotive communication systems

Procurement Notes

Verify the specific suffix 'EWI+' corresponds to the 28-pin Wide SOIC package and the -40°C to +85°C industrial temperature grade. Confirm RoHS compliance status via official documentation. Ensure ordering details match the exact pinout and thermal requirements for the selected footprint.

Selection Notes

Select this model for applications requiring five receiver channels alongside three drivers. The 1Mbps data rate capability distinguishes it from the 250kbps MAX3244E variant. Verify that the 28-pin Wide SOIC package dimensions fit the available board space constraints compared to TSSOP or TQFN alternatives.

Part Context

This component belongs to the MAX32xxE family of 3V-powered RS-232 transceivers. It shares core architectural features with the MAX3224E through MAX3227E series, including the proprietary AutoShutdown Plus circuitry and dual charge pump design. The primary distinction lies in the channel count and guaranteed data rate specifications.

Replacement Considerations

MAX3245ECWI+T: Identical electrical performance in a tape-and-reel packaging format.

FAQ

How does the INVALID output function during shutdown?

The INVALID output remains active regardless of FORCEON or FORCEOFF states. It indicates whether valid RS-232 voltage levels are present on any receiver input, independent of the device's power management mode.

What is the purpose of the R2OUTB pin on the MAX3245E?

R2OUTB provides an always-active, noninverting complementary receiver output. It allows monitoring of receiver activity while other receivers are in a high-impedance state, preventing forward biasing of connected peripheral devices.

How is the AutoShutdown Plus feature triggered?

The feature activates when all receiver and transmitter inputs remain inactive for more than 30 seconds. This typically occurs if the RS-232 cable is disconnected or if the driving UART is turned off.