ICL3237CAZ-T

Overview

The ICL3237CAZ-T is a low-power RS-232 transceiver manufactured by Renesas Electronics Corporation, housed in a 28-lead SSOP package with tape and reel packaging. It operates on a single +3V to +5.5V supply and features five drivers and three receivers, plus one noninverting monitor receiver. The device supports selectable data rates of 250kbps or 1Mbps via the MBAUD pin. It includes manual powerdown functionality that reduces supply current to 1µA. The component meets EIA/TIA-232 specifications at 3V and offers ±15kV ESD protection.

Feature Summary

• Integrated manual powerdown control for ultra-low standby current consumption
• Pin-selectable data rate configuration for flexible baud rate operation
• Noninverting always-active monitor receiver for wake-up capability
• On-chip charge pumps requiring only four external capacitors

Applications

• Battery-powered handheld devices and portable equipment
• Laptop computers and notebook systems
• Cellular and mobile phones
• PDAs and Palmtops

Procurement Notes

Verify the specific suffix 'T' indicates tape and reel packaging rather than tube. Confirm the 'C' designation corresponds to the commercial temperature range of 0°C to 70°C. Ensure moisture sensitivity handling procedures are followed as per Technical Brief TB363 during storage and assembly.

Selection Notes

Select this part when a 5-driver, 3-receiver RS-232 interface is required within a 3V to 5.5V system. Choose the '-T' suffix specifically for automated surface-mount assembly processes. Consider the manual shutdown feature if minimizing battery drain in standby modes is a primary design constraint.

Part Context

This component belongs to the Intersil ICL32XX family of 3V RS-232 transceivers. It serves as a drop-in replacement for the MAX3237. The device utilizes regulated on-chip dual charge pumps to generate internal ±5.5V supplies from a low-voltage single source.

Replacement Considerations

The datasheet identifies the MAX3237 as a compatible drop-in replacement. Verify pinout compatibility and electrical parameter alignment before substitution.

FAQ

How is the data rate selected?

The data rate is selected via the MBAUD pin. Driving it low selects 250kbps, while driving it high selects 1Mbps.

What is the function of the ROUTB pin?

ROUTB is a noninverting, always-active receiver output used for monitoring signals, such as ring indicators, even when the device is in powerdown mode.

How does the device achieve low power consumption?

It uses a manual shutdown (SHDN) pin to disable transmitters and on-board power supplies, reducing supply current to 1µA.