ICL3243CVZ-T

Overview

The ICL3243CVZ-T 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, supporting data rates up to 250 kbps while complying with EIA/TIA-232 and V.28/V.24 specifications. The device operates on a single 3V to 5.5V supply and features an automatic power-down function that reduces standby current to approximately 1 µA when the cable is disconnected or the peripheral is off. It includes noninverting always-active receivers for wake-up capability and provides 15 kV ESD protection on all lines.

Feature Summary

• Automatic power-down circuitry conserves energy by disabling internal charge pumps and driver circuits during idle states or cable removal.
• Integrated efficient on-chip charge pumps enable operation from a single low-voltage supply without external dual-voltage sources.
• Always-active noninverting receivers maintain signal monitoring to support system wake-up functions from low-power modes.

Applications

• Serial port implementation in notebook and laptop computers requiring low standby power consumption.
• Personal Digital Assistants (PDAs) and portable handheld devices where board space and battery life are critical constraints.
• Mixed voltage systems interfacing between 3.3V logic controllers and standard RS-232 peripherals.

Procurement Notes

Verify the suffix 'T' indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm RoHS3 compliance status as specified by the manufacturer's current documentation. Check moisture sensitivity level (MSL 3) requirements for storage and handling prior to soldering. Ensure the supplier provides valid traceability documents matching the Renesas Electronics Corporation part number.

Selection Notes

Select this component when a design requires three transmit channels and five receive channels within a single RS-232 interface. It is suitable for applications needing automatic power management to extend battery life in portable electronics. Compare against similar family members like the ICL3243CBZ if tube packaging is preferred over reel packaging. Verify that the 250 kbps data rate meets the specific communication speed requirements of the target peripheral devices.

Part Context

This part belongs to the ICL322x/3232/3241/3243 series of one-microamp RS-232 transceivers. The family shares common architecture features such as automatic power-down and small capacitor requirements. The CVZ suffix typically denotes a commercial temperature range (0°C to 70°C) and specific packaging variations within the Renesas portfolio. It serves as a direct replacement for older Intersil branded versions of the same functional specification.

Replacement Considerations

• MAX3243EIDW

FAQ

How does the automatic power-down feature function?

The device automatically powers down the on-chip power-supply and driver circuits when an attached peripheral is shut off or the RS-232 cable is removed, reducing standby current to 1 µA without hardware changes.

What is the purpose of the always-active receivers?

The noninverting always-active receivers remain powered even in low-power modes to detect incoming signals, enabling the system to wake up from sleep states.

Does this component require dual voltage supplies?

No, it operates from a single 3V to 5.5V supply using efficient on-chip charge pumps to generate the necessary internal voltages for RS-232 signaling.