ADM232AARNZ-REEL

Overview

The ADM232AARNZ-REEL is a high-speed RS-232 line driver and receiver manufactured by Analog Devices Inc. It operates from a single 5 V power supply and supports transmission rates up to 200 kB/s. The device integrates two drivers and two receivers within a 16-lead Standard Small Outline Package (SOIC). Internal charge pump circuitry generates the required bipolar voltage levels using four external 0.1 µF capacitors. It meets EIA-232-E and V.28 specifications, features Schmitt trigger inputs for noise immunity, and includes internal pull-up and pull-down resistors on input pins.

Feature Summary

• Integrates an on-board DC-DC converter utilizing small external capacitors to generate RS-232 voltage levels from a single 5 V supply.
• Features Schmitt trigger inputs on receivers to ensure error-free reception of signals with slow transition times or high noise environments.
• Includes internal 400 kΩ pull-up resistors on TTL/CMOS transmitter inputs and 5 kΩ pull-down resistors on RS-232 receiver inputs.

Applications

• Computer serial communication ports
• Peripheral interface connections
• Modem data transmission links
• Printer interface circuits
• Industrial instrument control systems

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and reel configuration. Ensure the component matches the required industrial temperature range and RoHS compliance status before integration into production designs.

Selection Notes

Select this component when a standard RS-232 interface is required without shutdown functionality. Compare against the ADM222 if power reduction via shutdown is needed, or the ADM242 if bus sharing capabilities are necessary. Confirm that the 16-lead SOIC footprint fits the target PCB layout constraints.

Part Context

This part belongs to the ADM232A family, which serves as a high-speed upgrade for legacy AD232 and ADM232L devices. It is pin-compatible with industry-standard MAX222/MAX232A/MAX242 components, facilitating direct replacement in existing designs requiring improved speed performance.

Replacement Considerations

ADM232AARNZ-REEL7

FAQ

Does the ADM232A support a shutdown mode?

No, the ADM232A does not include a shutdown function. This feature is available in the ADM222 and ADM242 variants within the same family.

What is the purpose of the internal pull-up resistor on the transmitter inputs?

The internal 400 kΩ pull-up resistor ensures that unused transmitter inputs default to a logic high state, forcing the corresponding outputs into a low state to prevent undefined signal transmission.

How many external capacitors are required for operation?

Four external 0.1 µF capacitors are required to support the internal charge pump voltage converter circuitry.