MAX3245CAI+T

Overview

The MAX3245CAI+T is a true RS-232 transceiver manufactured by Analog Devices/Maxim Integrated, featuring three drivers and five receivers. It supports data rates up to 1Mbps with MegaBaud operation and operates on a single +3.0V to +5.5V supply. The device incorporates AutoShutdown Plus technology, reducing supply current to 1µA when inputs are inactive for over 30 seconds. It utilizes a dual charge pump requiring only four 0.1µF capacitors at 3.3V. The component is housed in a 28-pin SSOP package and is designed for EIA/TIA-232 and V.28/V.24 communication interfaces.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption during periods of inactivity or cable disconnection without BIOS modifications.
• MegaBaud capability ensures reliable 1Mbps transmission speeds suitable for high-speed peripherals like ISDN modems.
• Integrated INVALID output signal detects valid RS-232 voltage levels independently of shutdown states.
• Dedicated noninverting receiver output (R2OUTB) remains active during shutdown to monitor external devices.

Applications

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

Procurement Notes

Verify the specific suffix 'CAI' indicates the commercial temperature range and SSOP package configuration. Confirm RoHS compliance status through official manufacturer documentation. Ensure the ordering code matches the exact pinout and electrical specifications required for the target design.

Selection Notes

Select this model for applications requiring 1Mbps data rates and low-power standby modes. Compare against the MAX3244 if a lower 250kbps rate is sufficient. Verify that the 28-pin SSOP footprint fits the PCB layout constraints. Check capacitor requirements based on the specific operating voltage.

Part Context

This component belongs to the MAX3224–MAX3227/MAX3244/MAX3245 family of RS-232 transceivers. It shares core features like AutoShutdown Plus and dual charge pumps with siblings such as the MAX3244, differing primarily in guaranteed data rates and specific driver/receiver counts within the series.

Replacement Considerations

The MAX3244EAI+T serves as a functional alternative within the same family, offering identical packaging and features but with a guaranteed 250kbps data rate instead of 1Mbps.

FAQ

How does the AutoShutdown Plus feature determine when to enter low-power mode?

The device enters shutdown mode when no valid signal transition is detected on any receiver or transmitter input for more than 30 seconds.

What is the function of the R2OUTB pin on the MAX3245?

R2OUTB provides an always-active, noninverting receiver output that allows monitoring of receiver activity even when other outputs are in a high-impedance state during shutdown.

Can the MAX3245CAI+T operate directly from a 3.3V supply?

Yes, the device operates from a +3.0V to +5.5V supply and requires only four 0.1µF capacitors for the charge pump when running at 3.3V.