MAX3291CSD+

Overview

The MAX3291CSD+ is a full-duplex RS-485/RS-422 transceiver featuring driver preemphasis circuitry to extend communication distance and data rates 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 provides a fail-safe receiver that guarantees a logic-high output when the input is open. Its 1/4-unit-load receiver impedance allows for up to 128 transceivers on the bus.

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 supports 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 documentation to confirm pinout compatibility and electrical specifications. Ensure the operating temperature range meets system requirements. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and sourcing channels.

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 that the system power supply noise levels are low enough to support preemphasis operation at the target baud rate.

Part Context

This device belongs to the MAX3291/MAX3292 family of high-speed RS-485/RS-422 transceivers. It is designed to overcome signal integrity limitations in long-distance serial communications by actively compensating for cable capacitance effects through preemphasis technology.

Replacement Considerations

The datasheet lists the following pin-compatible replacements: '75180, MAX489, MAX491, MAX3080, MAX3083, MAX3086, and MAX1482.