MAX3224EEAP+

Overview

The MAX3224EEAP+ is a dual driver/receiver RS-232 transceiver in a 20-pin SSOP package. It operates from a +3.0V to +5.5V supply and guarantees a 250kbps data rate. The device features AutoShutdown Plus, reducing supply current to 1μA when idle for over 30 seconds. I/O pins are protected against ±15kV air-gap ESD and ±8kV contact discharge. A READY output indicates charge pump regulation status.

Feature Summary

• AutoShutdown Plus automatically reduces power consumption by shutting down the internal charge pumps when no activity is detected on receiver or transmitter inputs for more than 30 seconds.
• Integrated READY logic-level output asserts high when the internal charge pumps are regulating, indicating the device is ready to transmit.
• Robust electrostatic discharge protection on all transmitter outputs and receiver inputs ensures reliability in harsh environments.

Applications

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

Procurement Notes

Verify the component matches the exact ordering suffix EEAP+, which specifies the -40°C to +85°C temperature range and 20-pin SSOP package. Confirm lead-free/RoHS compliance as indicated by the '+' designation. Cross-reference with official Analog Devices documentation to ensure authenticity and correct pinout configuration.

Selection Notes

Select this part for applications requiring low-power standby modes without BIOS modifications. Ensure the design supports the required four external 0.1μF capacitors for the dual charge pump. Verify that the 250kbps data rate meets system requirements, as higher-speed variants like the MAX3225E are available if 1Mbps operation is necessary.

Part Context

This component belongs to the MAX3224E–MAX3227E/MAX3244E/MAX3245E family of 3V-powered RS-232 transceivers. These devices share common features such as AutoShutdown Plus and enhanced ESD protection but differ in the number of drivers and receivers. The MAX3224E specifically provides two drivers and two receivers.

Replacement Considerations

The MAX3224ECAP+ serves as a direct replacement for industrial temperature ranges (0°C to +70°C). For higher speed requirements, the MAX3225EEAP+ offers 1Mbps capability within the same package and temperature range.

FAQ

How does the AutoShutdown Plus feature function?

It monitors receiver and transmitter inputs. If no valid signal transition occurs for more than 30 seconds, the device shuts down the charge pumps to achieve 1μA supply current. It wakes up upon detecting a valid transition.

What is the purpose of the READY output?

The READY output is a logic-level signal that goes high when the internal charge pumps are regulating and the device is ready to begin transmitting. It goes low during shutdown mode.

What external components are required for operation?

The device requires four small 0.1μF external capacitors to operate the dual charge pump voltage converter, generating the necessary +5.5V and -5.5V supplies from the single VCC input.