MAX3245EEAI+

Overview

The MAX3245EEAI+ is a true 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 for full-duplex communication. The device guarantees a data rate of 1Mbps using MegaBaud technology. It incorporates AutoShutdown Plus, which reduces the supply current to 1μA when idle. ESD protection is rated at ±15kV via Air-Gap Discharge, ±8kV via Contact Discharge, and ±15kV via the Human Body Model. The component is housed in a 28-pin TSSOP package and supports an 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 inactivity, waking up upon valid signal transitions without BIOS modifications.
• MegaBaud operation ensures reliable 1Mbps data rates suitable for high-speed applications such as ISDN modem communications.
• Integrated dual charge pump generates internal +5.5V and -5.5V supplies using only four small external capacitors.
• Enhanced electrostatic discharge protection safeguards transmitter outputs and receiver inputs against high-voltage static events.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and battery-powered equipment
• Hand-held devices and peripherals
• Printers and automotive systems

Procurement Notes

Verify the specific suffix EEAI+ corresponds to the required 28-TSSOP package and industrial temperature range (-40°C to +85°C). Confirm RoHS compliance status through official manufacturer documentation. Ensure ordering details match the exact part number to avoid functional discrepancies associated with different package codes or thermal ratings.

Selection Notes

Select this component when designing space-constrained portable electronics requiring low standby power consumption. The integrated charge pump eliminates the need for external voltage regulators. Verify that the system UART can tolerate the high-impedance state of the receiver outputs during shutdown periods to prevent unintended current paths.

Part Context

This device belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E family of RS-232 transceivers. It shares core architectural features with the MAX3244E but distinguishes itself through guaranteed 1Mbps performance capabilities compared to the 250kbps limit of other members in the series.

Replacement Considerations

MAX3245ECAI+T: Identical electrical specifications utilizing SSOP-28 packaging.

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 at the receiver inputs, independent of the device's operational 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 ring indicator signals while other receiver outputs are in a high-impedance state, preventing forward biasing of connected peripheral devices.

How is the AutoShutdown Plus feature triggered?

The feature activates when no valid signal transition is detected on any receiver or transmitter input for more than 30 seconds, causing the charge pumps to shut down and reducing supply current to 1μA.