ICL3243CBZ

Overview

The ICL3243CBZ is a full-duplex RS-232 transceiver manufactured by Renesas Electronics Corporation, housed in a 28-SOIC surface-mount package. It integrates three drivers and five receivers to support complete serial port functionality. The device operates on a single power supply ranging from 3V to 5.5V and guarantees data rates exceeding 250kbps under worst-case load conditions. Key electrical specifications include a receiver hysteresis of 300mV for noise immunity and ±15kV electrostatic discharge (ESD) protection on all RS-232 pins. The component functions within an operating temperature range of 0°C to 70°C and complies with EIA/TIA-232 and V.28/V.24 standards.

Feature Summary

• Integrated charge pump requiring only four small external capacitors for voltage conversion
• Automatic power-down mode reduces standby current to 1µA when no valid RS-232 signals are present
• Receiver input hysteresis enhances noise immunity in high-interference environments
• Robust ±15kV ESD protection on all RS-232 interface pins

Applications

• Battery-powered portable devices such as PDAs and laptops
• Modems, printers, and other peripheral equipment connections
• Digital cameras and cellular/mobile phones requiring serial communication
• Mixed 3.3V and 5.0V system interfaces

Procurement Notes

Verify the specific suffix against official Renesas documentation to confirm package type and temperature grade. Ensure compatibility with existing PCB footprint dimensions for the 28-SOIC variant. Confirm moisture sensitivity level requirements during assembly processes. Cross-reference RoHS compliance status with current regulatory standards before final procurement approval.

Selection Notes

Select this component when designing systems requiring a full RS-232 port with minimal external component count. It is suitable for applications needing low standby power consumption via automatic shutdown features. Consider the 28-SOIC package constraints for board space limitations. Verify that the 250kbps data rate meets the specific communication speed requirements of the target application.

Part Context

This part belongs to the ICL32xxE series of low-power RS-232 transceivers designed for 3.0V to 5.5V operation. It serves as a direct replacement for legacy 5V devices like the MAX221E or HIN232, offering pin-compatible upgrades with significantly reduced power consumption. The series is optimized for portable electronics where battery life and board space are critical design constraints.

Replacement Considerations

The MAX3243EIDW from Texas Instruments is documented as an upgrade substitute. Verify pin-to-pin compatibility and electrical parameter alignment before implementation.