ADM241LJRZ

Overview

The ADM241LJRZ is a CMOS RS-232 line transceiver from Analog Devices, housed in a 28-pin SOIC package. It operates on a single 5 V supply and integrates two internal charge pumps to generate the required ±10 V levels for EIA-232-E compliance. The device provides four drivers and five receivers with a data rate of 120 kbps. Key features include a low power shutdown mode consuming less than 1 µA, an active-low enable input for receiver control, and Schmitt trigger inputs with 0.65 V hysteresis. It supports an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates dual charge pump converters to operate from a single 5 V supply without external voltage sources.
• Features a low power shutdown mode that reduces current consumption to under 1 µA for battery applications.
• Includes an active-low enable pin to place receiver outputs in a high impedance state for bus sharing.

Applications

• Battery-powered equipment requiring minimal standby power
• Microprocessor systems needing shared communication lines
• Industrial instruments operating in noisy environments

Procurement Notes

Verify the J suffix indicates the commercial temperature grade (0°C to 70°C) if strictly required, though the datasheet lists Industrial (A version) as -40°C to +85°C. Confirm the package type matches the specific ordering requirement. Check for RoHS compliance status on the latest manufacturer documentation before finalizing procurement.

Selection Notes

Select this component when a single 5 V supply is available but RS-232 voltage levels are needed. It is suitable for designs requiring multiple receive channels (five) and four transmit channels. The shutdown feature makes it ideal for portable devices. Ensure the load capacitance does not exceed 2500 pF for optimal slew rate performance.

Part Context

The ADM241L belongs to the ADM2xxL family of enhanced CMOS RS-232 transceivers. This family offers lower power consumption and faster slew rates compared to the legacy AD2xx series. The ADM241L specifically distinguishes itself by offering five receivers alongside four drivers, providing greater flexibility for complex interface topologies.

Replacement Considerations

ADM236L: Offers similar functionality but with only three receivers instead of five.

FAQ

How does the shutdown mode affect the charge pump?

When the SD pin is driven high, the internal charge pump is disabled, turning off the driver outputs and placing receiver outputs in a high impedance state.

What is the purpose of the EN pin?

The EN pin is an active-low enable input that allows the receiver outputs to be placed in a high impedance state, facilitating connection to microprocessor data buses or shared lines.