ADM209ARS
ADM209ARS - 200kbps 5V RS-232 Transceiver | Analog Devices
The Analog Devices ADM209ARS is a +5 V CMOS RS-232 interface transceiver with 3 drivers, 5 receivers, 200 kbps data rate, and a 24-lead SOIC package. It uses 0.1 µF charge-pump capacitors, provides 9 V output swing from a 5 V supply, accepts receiver inputs up to 30 V, and includes an enable control for low-power shutdown. The manufacturer identifies the ADM209 family as obsolete, so new production availability should be confirmed before committing a design.
A CMOS RS-232 transceiver is an interface IC that translates logic-level signals between a host or controller and RS-232-compatible equipment. In the hierarchy of electronic components, it belongs to interface ICs, within the broader semiconductor category. The driver channels convert TTL/CMOS logic into RS-232 levels, while the receiver channels convert RS-232 inputs back into logic levels. This allows equipment operating at different logic and voltage domains to communicate over a wired serial interface.
The ADM209ARS provides five receiver channels and three driver channels, making it useful where a design has more incoming data paths than outgoing data paths. Its 200 kbps maximum data rate supports moderate-speed serial links, while the 0.1 µF charge-pump capacitor requirement reduces external capacitance compared with earlier RS-232 implementations. The 30 V receiver input rating provides additional tolerance for exposed or industrial serial connections, although the complete interface still requires suitable protection in harsh environments.
Internally, the device combines CMOS drivers and receivers with on-board charge-pump circuitry. The charge pump generates the RS-232 voltage levels required by the drivers, while the enable pin supports shutdown operation that can reduce system power consumption. Because the part is specified for a single +5 V supply, the ADM209ARS simplifies system power architecture compared with dual-supply RS-232 transceivers. Its 24-lead SOIC package supports conventional surface-mount assembly and is the relevant footprint constraint when evaluating replacements.
Typical uses include industrial serial controllers, test equipment, point-of-sale systems, data-acquisition equipment, and embedded systems that need multiple RS-232 receive paths. A 3-transmitter design can connect several peripherals while five receiver inputs can monitor commands, status signals, or acknowledgments. In cable-based installations, designers should also consider ground reference, electrostatic discharge, surge, and isolation requirements that are outside the IC itself.
For replacement work, verify the complete 24-pin signal map, supply voltage, channel counts, charge-pump capacitor values, enable polarity, and receiver thresholds rather than relying only on the RS-232 protocol label. The page distinguishes documented cross-reference candidates from a manufacturer-confirmed universal replacement and marks unavailable technical and commercial fields where the retrieved sources do not provide verified values.
This page consolidates the retrieved Analog Devices product information, distributor availability, RS-232 application context, package constraints, and cross-reference guidance. It adds design-oriented selection criteria that are useful beyond the basic manufacturer description while clearly separating verified facts from information that still requires engineering confirmation.
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