ICL3221EIAZ-T7A

Overview

The ICL3221EIAZ-T7A is a single driver, single receiver RS-232 transceiver from the ICL32xxE series. It operates on a single power supply ranging from 3V to 5.5V and supports data rates up to 250 kb/s. The device features full-duplex communication with TTL/CMOS-compatible inputs and outputs. Key electrical parameters include a maximum propagation delay of 0.15μs at specified load capacitance, a maximum high-level output current of 1.0mA, and a maximum low-level output current of 1.6mA. It provides 15kV ESD protection on RS-232 pins and includes an automatic power-down function that reduces operating current to approximately 1mA in standby mode.

Feature Summary

• Integrated automatic power-down circuitry that significantly reduces standby supply current when no valid RS-232 signal is detected.
• Robust electrostatic discharge protection rated at 15kV for both air gap and human body models on all RS-232 I/O pins.
• Compliance with EIA/TIA-232 and V.28/V.24 interface specifications while operating at low voltage levels down to 3V.

Applications

• Portable computing devices such as PDAs and palmtops requiring low power consumption.
• ISDN terminal adaptors and peripheral interfaces.
• Notebook and laptop computer serial communication ports.

Procurement Notes

Verify the specific suffix T7A indicates reel packaging during acquisition. Confirm RoHS compliance status through official manufacturer documentation or certified datasheets. Ensure the SSOP-16 package dimensions match the target PCB footprint requirements before finalizing orders.

Selection Notes

Select this component for applications requiring a single channel of RS-232 communication with minimal power usage. It serves as a direct replacement for legacy 5V parts like the MAX207E in 3V systems. Verify that the 250 kbps data rate meets the system's timing requirements and that the SSOP-16 package is suitable for the assembly process.

Part Context

This part belongs to the ICL32xxE family of low-power RS-232 transceivers manufactured by Renesas Electronics (formerly Intersil). The family shares common architectural features including efficient charge pumps and automatic power management. The ICL3221 variant specifically provides one driver and one receiver configuration within this series.

Replacement Considerations

The ICL3221EIAZ is the tube-packaged equivalent of the T7A reel version. Other family members like the ICL3225E offer dual channels. Cross-reference with older 5V parts such as the MAX207E for backward compatibility in design upgrades.