MAX3291CSD+T

Overview

The MAX3291CSD+T is a full-duplex RS-485/RS-422 transceiver featuring driver preemphasis circuitry to extend communication distance and data rate by reducing intersymbol interference. It operates from a single +5V supply with a typical no-load supply current of 3mA and a shutdown mode current of 100nA. The device supports data rates up to 10Mbps, offers a -7V to +12V common-mode input range, and includes fail-safe receiver inputs that guarantee a logic-high output when the input is open. It utilizes a 14-pin SOIC package.

Feature Summary

• Driver preemphasis circuitry reduces intersymbol interference for high-speed, long-distance communication
• Fail-safe receiver input guarantees a logic-high output if the input is open circuit
• Low-current shutdown mode reduces supply current to 100nA
• 1/4-unit-load receiver input impedance allows up to 128 transceivers on the bus

Applications

• Long-Distance, High-Speed RS-485/RS-422 Communications
• Telecommunications
• Industrial-Control Local Area Networks

Procurement Notes

Verify the component against official Analog Devices datasheets to confirm pinout compatibility and electrical specifications. Ensure the operating temperature range meets system requirements. Cross-reference ordering information to validate the specific suffix and package type before procurement.

Selection Notes

Select this component for applications requiring extended cable lengths or higher data rates where standard transceivers suffer from intersymbol interference. The fixed preemphasis interval suits designs needing industry-standard pin-compatibility. Verify power supply stability as preemphasis operation at low data rates depends on minimizing system noise.

Part Context

The MAX3291CSD+T belongs to the MAX3291/MAX3292 family of high-speed RS-485/RS-422 transceivers. While the MAX3292 features a programmable preemphasis interval via an external resistor, the MAX3291 provides a fixed internal preemphasis interval optimized for data rates between 5Mbps and 10Mbps.

Replacement Considerations

The MAX3291CSD+T is pin-compatible with the '75180, MAX489, MAX491, MAX3080, MAX3083, MAX3086, and MAX1482.