ADM241LJRSZ-REEL

Overview

The ADM241LJRSZ-REEL is a CMOS RS-232 transceiver from Analog Devices, operating on a single 5 V supply. It integrates four drivers and five receivers within a 28-pin SOIC package. The device supports data rates up to 120 kbps and features internal charge pumps generating ±10 V supplies using only 1 µF capacitors. Key control inputs include an active-high shutdown pin that reduces power dissipation below 5 µW and an active-low enable pin for receiver output tri-stating. It complies with EIA-232-E specifications and operates across the industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates dual charge pump converters to generate required RS-232 voltage levels from a single 5 V source
• Features low power shutdown mode for battery-operated applications
• Includes Schmitt trigger receivers with hysteresis for noise immunity
• Provides high impedance receiver outputs via dedicated enable input

Applications

• Battery-powered portable equipment
• Industrial instruments
• Modems and printers
• Computer peripherals

Procurement Notes

Verify the ordering suffix matches the specific package variant and reel quantity requirements. Confirm the temperature grade corresponds to the intended operational environment. Ensure the component version aligns with current design specifications before finalizing procurement orders.

Selection Notes

Select this component when a single 5 V supply is available but standard RS-232 voltage levels are required. The integrated shutdown feature makes it suitable for power-sensitive designs. Verify that the 28-pin footprint accommodates the necessary external 1 µF capacitors for the charge pump circuitry.

Part Context

This part belongs to the ADM2xxL family of line drivers and receivers designed for EIA-232-E interfaces. It serves as an enhanced upgrade to the AD2xx series, offering lower power consumption and faster slew rates. The ADM241L specifically provides the highest channel count in the family with integrated control logic.

Replacement Considerations

ADM241ARZ

FAQ

How does the shutdown function affect the charge pump?

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

What is the purpose of the EN pin?

The EN pin allows the receiver outputs to be placed in a high impedance state when driven high, facilitating connection to microprocessor data buses or shared lines.

Can unused transmitter inputs be left unconnected?

Yes, unused TTL/CMOS inputs can be left unconnected because they have internal 400 kΩ pull-up resistors that force the outputs into a low state.