ICL3225IAZ

Overview

The ICL3225IAZ is a dual driver/receiver RS-232 transceiver manufactured by Renesas Electronics Corporation, housed in a 20-SSOP surface-mount package. It operates on a single power supply ranging from 3V to 5.5V and supports full-duplex communication at data rates up to 1Mbps. The device features enhanced automatic powerdown functionality, reducing standby current to 1µA. It includes ±15kV ESD protection on all RS-232 lines and meets EIA/TIA-232 specifications. Operating temperatures range from -40°C to +85°C.

Feature Summary

• Integrated charge pumps requiring only four external capacitors for voltage conversion
• Enhanced automatic powerdown mechanism significantly reduces standby power consumption
• Robust ±15kV electrostatic discharge protection on transmitter and receiver inputs
• Receiver hysteresis designed to improve noise immunity in signal processing

Applications

• Portable digital assistants (PDAs) and palmtop computers
• Notebook and laptop computer serial interfaces
• Industrial control systems with low-power requirements
• Battery-operated equipment requiring extended standby life

Procurement Notes

Verify the specific suffix 'IAZ' confirms the industrial temperature grade (-40°C to +85°C) and SSOP-20 package configuration. Confirm RoHS compliance status and moisture sensitivity level (MSL 2) prior to soldering. Ensure ordering documentation matches the exact manufacturer part number to avoid confusion with similar variants like ICL3225EIAZ.

Selection Notes

Select this component when designing for mixed 3.3V and 5.0V logic systems requiring reliable RS-232 connectivity. The 1µA powerdown current makes it suitable for battery-powered applications where energy conservation is critical. Verify that the required data rate does not exceed 1Mbps under worst-case load conditions before finalizing the design.

Part Context

This device belongs to the Intersil ICL32XXE family of RS-232 transceivers, now produced under Renesas Electronics. It serves as a drop-in replacement for legacy MAX3225 devices. The ICL3225 variant specifically provides a 'Ready to Transmit' indicator output, distinguishing it from other members of the series such as the ICL3245.

Replacement Considerations

ICL3225EIAZ-T

FAQ

Does the ICL3225IAZ support operation at 3.0V?

Yes, the device meets EIA/TIA-232 and V.28/V.24 specifications even at a supply voltage of 3.0V.

What is the typical standby current in powerdown mode?

The standby supply current is reduced to a 1µA trickle current when the enhanced automatic powerdown feature is active.

How many external capacitors are required for the internal voltage converters?

Only four external 0.1µF capacitors are required for the efficient on-chip charge pumps.