MAX3161ECAG+

Overview

The MAX3161ECAG+ 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 with pin-selectable slew rates. It includes an integrated dual charge pump for voltage generation, true fail-safe receivers, and wiring fault protection. The component functions within an industrial temperature range of -40°C to +85°C.

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 eliminates the need for external bipolar power supplies, enabling single-supply operation.
• Enhanced robustness provided by ±15kV ESD protection, short-circuit protection across the common-mode voltage range, and thermal shutdown capabilities.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'CAG+' against official documentation to confirm the commercial temperature range (-40°C to +85°C) and lead-free status. Ensure the 24-pin SSOP footprint matches the target PCB layout requirements. Cross-reference the manufacturer's current product status to confirm availability before finalizing procurement plans.

Selection Notes

Select the MAX3161E variant when separate transmitter outputs and receiver inputs are required for both RS-232 and RS-485 modes, unlike the shared I/O of the MAX3160E. This model is optimized for multiplexing a single UART across two distinct interface buses. Verify that the 24-pin SSOP package dimensions fit the available board space constraints.

Part Context

The MAX3161E belongs to a family of programmable multiprotocol transceivers alongside the MAX3160E and MAX3162E. While the MAX3160E shares I/O ports and the MAX3162E supports simultaneous operation, the MAX3161E provides distinct physical pins for each protocol's drivers and receivers while sharing digital control logic. This architecture facilitates efficient board layout for applications requiring protocol switching.

Replacement Considerations

Public confirmed substitute part numbers: MAX3161EACG+, MAX3161EECG+.

FAQ

How does the FAST input affect data transmission?

The FAST input selects the transmitter slew rate. Asserting FAST disables slew-rate limiting, allowing data rates up to 10Mbps for RS-485/RS-422 and 1Mbps for RS-232. Deasserting FAST enables slew-rate limiting to minimize EMI at lower speeds.

What is the function of the HDPLX pin?

The HDPLX pin configures the RS-485/RS-422 operation mode. Driving it high places the device in half-duplex mode, internally connecting receiver inputs to driver outputs. Driving it low maintains full-duplex operation.

How is low-power consumption achieved?

Driving the SHDN pin low shuts down the charge pump and transmitters, reducing the supply current to 10nA. The RS-232 receivers remain active during shutdown if configured in RS-232 mode.