ICL3226ECA

Overview

The ICL3226ECA is a single driver and single receiver RS-232 transceiver manufactured by Intersil, now part of Renesas Electronics. It operates on a single power supply ranging from +3V to +5.5V, making it suitable for low-voltage systems. The device supports data rates up to 1Mbps and features enhanced automatic powerdown functionality to minimize standby current consumption. It includes integrated charge pumps that require only external 0.1µF capacitors. The component provides ±15kV electrostatic discharge (ESD) protection on all RS-232 lines, ensuring robustness in harsh environments. It complies with EIA/TIA-232 and V.28/V.24 specifications.

Feature Summary

• Enhanced automatic powerdown circuit reduces standby supply current significantly when the interface is idle.
• Integrated charge pumps enable operation from a single voltage supply using small external capacitors.
• Provides ±15kV ESD protection on RS-232 inputs and outputs to prevent damage from static discharge.
• Fully compliant with EIA/TIA-232 and V.28/V.24 standards at supply voltages as low as 3.0V.

Applications

• Portable computers and notebook PCs requiring low power consumption modes.
• Battery-powered handheld devices and PDAs utilizing serial communication interfaces.
• Industrial control systems needing reliable RS-232 connectivity with ESD resilience.
• Modems and peripheral equipment interfacing with microcontrollers or DSPs.

Procurement Notes

Verify the manufacturer origin, as Intersil operations were acquired by Renesas Electronics. Confirm the package type matches the required PCB footprint, typically SSOP-16 for this variant. Check RoHS compliance status if environmental regulations apply to the end product. Ensure the specific suffix indicates the correct temperature range and packaging format intended for the design.

Selection Notes

Select this component when a single channel of full-duplex RS-232 communication is required in space-constrained designs. It is appropriate for applications demanding low quiescent current during sleep states. Compare against higher-speed variants if data rates exceed 1Mbps. Consider the capacitor size requirements compared to older generations to optimize board area.

Part Context

This device belongs to the ICL32XXE family of RS-232 transceivers designed for 3V to 5.5V operation. It serves as a direct replacement for legacy parts like the MAX232 in modern low-voltage systems. The 'E' suffix denotes the enhanced version with automatic powerdown features. It is widely used in embedded systems transitioning from 5V to 3.3V logic levels.

Replacement Considerations

The MAX3221E is a pin-compatible alternative offering similar performance characteristics. The ICL3221E provides equivalent functionality within the same manufacturer's portfolio. Verify electrical parameters such as drive strength and ESD ratings before substituting. Ensure the replacement supports the required data rate and operating temperature range.