MAX3161CAG+T

Overview

The MAX3161CAG+T 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 an integrated dual charge pump for RS-232 compliance without requiring bipolar supplies. The device supports pin-selectable operation as either a 2TX/2RX RS-232 interface or a single RS-485/422 transceiver. It offers programmable slew rates, enabling data transmission up to 250kbps with limiting or up to 10Mbps in RS-485 mode and 1Mbps in RS-232 mode when FAST is asserted. The component includes fail-safe receivers, short-circuit protection, and a shutdown mode drawing 1µA.

Feature Summary

• Pin-programmable configuration allows flexible selection between RS-232 and RS-485/422 modes within a single package.
• Integrated dual charge pump eliminates the need for external bipolar power supplies.
• Programmable slew rate control minimizes electromagnetic interference and cable reflections.
• Fail-safe receiver design ensures a logic-high output during input shorts or open circuits.

Applications

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

Procurement Notes

Verify the specific suffix 'CAG' corresponds to the commercial temperature range (0°C to +70°C) and the 'T' indicates tape-and-reel packaging. Confirm RoHS compliance status via the manufacturer's official documentation before finalizing procurement specifications.

Selection Notes

Select this model over the MAX3160 if separate transmitter and receiver outputs are required for both protocols rather than shared pins. Choose the MAX3161E variant if extended industrial temperature operation (-40°C to +85°C) is necessary instead of the commercial grade.

Part Context

This component belongs to the MAX3160/MAX3161/MAX3162 family of low-power multiprotocol transceivers. It shares core architecture with the MAX3160 but utilizes a 24-pin SSOP package to provide distinct I/O paths for RS-232 and RS-485 functions, optimizing it for applications requiring protocol multiplexing.

Replacement Considerations

Public confirmed substitute part numbers: MAX3161EAG+T (Extended Temperature), MAX3160CAP+T (Shared Pins). Verify pin compatibility and thermal requirements when substituting.

FAQ

How does the FAST pin affect data rates?

Asserting the FAST pin disables slew-rate limiting, allowing data rates up to 10Mbps in RS-485/422 mode and 1Mbps in RS-232 mode. Deasserting it limits the slew rate to reduce EMI, supporting error-free transmission up to 250kbps.

What is the function of the HDPLX pin?

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

How does the shutdown feature impact power consumption?

Driving the SHDN pin low shuts down the charge pump and transmitters, reducing supply current to 1µA. The RS-232 receivers remain active during shutdown to allow other devices to query the interface controller.