ADM222AR-REEL

Overview

The ADM222AR-REEL is a high-speed, 5 V, 0.1 µF CMOS RS-232 driver/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 with on-board DC-DC converters that generate ±10 V using four external 0.1 µF capacitors. It features an active-low shutdown (SHDN) pin that reduces supply current to 0.1 µA when disabled. The component meets EIA-232-E and V.28 specifications and is available in the 18-lead Standard Small Outline Package (RW-18).

Feature Summary

• Integrates dual RS-232 drivers and receivers with internal charge pump voltage conversion.
• Includes an active-low shutdown function to minimize quiescent power consumption.
• Features TTL/CMOS compatible inputs with internal pull-up resistors for unused pins.
• Provides Schmitt trigger receiver inputs with hysteresis for noise immunity.

Applications

• Computers
• Peripherals
• Modems
• Printers
• Instruments

Procurement Notes

Verify the specific ordering suffix 'REEL' indicates tape-and-reel packaging rather than tube packaging. Confirm the 'Z' suffix status if RoHS compliance is required, as the base model may differ. Ensure the package option RW-18 matches the target PCB footprint requirements. Cross-reference the manufacturer's latest datasheet revision to confirm any updates to absolute maximum ratings or thermal characteristics before finalizing procurement.

Selection Notes

Select this component when a single 5 V supply operation is required alongside RS-232 interface needs. The integrated shutdown feature makes it suitable for battery-powered applications where low standby current is critical. Verify that the 200 kB/s data rate meets system timing requirements. Ensure the design accommodates the four external 0.1 µF capacitors for the charge pump circuitry within the available board space.

Part Context

The ADM222 is part of the ADM222/ADM232A/ADM242 family of high-speed RS-232 transceivers. It serves as a pin-compatible upgrade for legacy devices like the AD232 and MAX222. Unlike the ADM232A, which lacks control pins, the ADM222 includes a shutdown function. The ADM242 variant adds an enable pin for bus sharing capabilities while retaining the shutdown feature.

Replacement Considerations

The ADM232A and ADM242 are pin-compatible alternatives within the same family. The ADM232A lacks the shutdown pin but offers similar electrical performance. The ADM242 includes both shutdown and enable functions. Legacy replacements include the AD232 and MAX222, though these may not support the higher 200 kB/s data rate or lower power consumption of the ADM222.