MAX3161EEAG+

Overview

The MAX3161EEAG+ is a multiprotocol transceiver from Analog Devices/Maxim Integrated, housed in a 24-pin SSOP package. It operates on a single +3.0V to +5.5V supply and features ±15kV ESD protection per the Human Body Model. The device supports RS-232 (up to 1Mbps) and RS-485/RS-422 (up to 10Mbps) communication protocols. It includes an integrated dual charge pump for RS-232 voltage generation, eliminating the need for external bipolar supplies. Key electrical parameters include a shutdown current of 1µA, a typical operating supply current of 6mA, and an input voltage range of ±25V for receiver inputs.

Feature Summary

• Pin-programmable configuration allows operation as either a 2Tx/2Rx RS-232 interface or a single RS-485/RS-422 transceiver.
• Integrated dual charge pump circuitry enables full RS-232 compliance using only a single positive power supply.
• Pin-selectable transmitter slew rates allow users to minimize electromagnetic interference or maximize data transmission speeds.
• Enhanced robustness features include true fail-safe receivers, short-circuit protection across the entire common-mode voltage range, and thermal protection.

Applications

• Point-of-Sales Equipment
• Industrial Controls
• RS-232 to RS-485 Interface Converters

Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature range of -40°C to +85°C. Confirm the 'AG+' designation indicates lead-free and RoHS-compliant packaging. Ensure the 24-pin SSOP footprint matches the target PCB layout requirements before finalizing procurement orders.

Selection Notes

Select this component when a design requires flexibility between RS-232 and RS-485/RS-422 modes within a single package. It is suitable for applications needing separate I/O ports for both protocols but sharing digital control lines. Consider the MAX3162E if simultaneous independent operation of both interfaces is required.

Part Context

This part belongs to the MAX3160/MAX3161/MAX3162 family of low-power, multiprotocol transceivers. While the MAX3160 shares common I/O ports and the MAX3162 offers fully independent interfaces, the MAX3161 provides a middle ground with separate analog I/O but shared logic pins, optimized for multiplexing a single UART across two buses.

Replacement Considerations

Public confirmed substitute part numbers: MAX3161ECAG+, MAX3161CAG+.

FAQ

How does the FAST pin affect data transmission?

The FAST pin selects the transmitter slew rate. Driving it high disables slew-rate limiting, allowing data rates up to 10Mbps in RS-485 mode or 1Mbps in RS-232 mode. Driving it low enables slew-rate limiting to reduce EMI.

What is the function of the HDPLX pin?

The HDPLX pin configures the RS-485/RS-422 operation mode. A logic high places the device in half-duplex mode by internally connecting receiver inputs to driver outputs, while a logic low enables full-duplex operation.

How is the shutdown current minimized?

Driving the SHDN pin low shuts down the charge pump and transmitters, reducing the supply current to approximately 1µA. The RS-232 receivers remain active during this state.