MAX3162EAI

Overview

The MAX3162EAI is a multiprotocol transceiver from Analog Devices/Maxim Integrated, operating on a single +3.0V to +5.5V supply. It integrates a dual charge pump and low-dropout transmitter output stage to support RS-232 and RS-485/RS-422 protocols simultaneously. The device features two RS-232 drivers/receivers and one RS-485/422 driver/receiver with separate digital I/O pins. It supports data rates up to 1Mbps for RS-232 and 10Mbps for RS-485/422 when slew-rate limiting is disabled. The component operates within an extended temperature range of -40°C to +85°C and is housed in a 28-pin SSOP package.

Feature Summary

• Simultaneous operation of a 2TX/2RX RS-232 interface and a half-duplex RS-485/422 transceiver
• Integrated dual charge pump eliminates the need for external bipolar power supplies
• Pin-selectable transmitter slew rate limiting minimizes EMI and reduces cable reflections
• True fail-safe receiver prevents false transitions during input short or open conditions

Applications

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

Procurement Notes

Verify the specific ordering suffix 'EAI' corresponds to the required extended temperature range (-40°C to +85°C) and the 28-pin SSOP package configuration. Confirm that the lead-free/RoHS-compliant status matches project requirements. Ensure the selected variant aligns with the simultaneous protocol operation needs rather than pin-programmable alternatives.

Selection Notes

Select the MAX3162EAI when distinct physical interfaces for both RS-232 and RS-485 are required concurrently. This model provides separate digital I/O pins compared to the MAX3160/MAX3161, facilitating independent control. Verify that the board layout accommodates the necessary charge-pump capacitors and that the 28-pin SSOP footprint fits the design constraints.

Part Context

The MAX3162EAI belongs to the MAX3160/MAX3161/MAX3162 family of multiprotocol transceivers. While the MAX3160 and MAX3161 offer pin-programmable configurations for either RS-232 or RS-485 modes, the MAX3162 is specifically designed to operate both protocols simultaneously. This distinction makes it suitable for applications requiring parallel communication channels without hardware switching.

Replacement Considerations

Public confirmed substitute part numbers: MAX3162CAI+ (Commercial Temperature Range).

FAQ

How does the MAX3162 differ from the MAX3160?

The MAX3162 supports simultaneous operation of a 2TX/2RX RS-232 interface and a single RS-485/422 transceiver with separate digital I/O pins. In contrast, the MAX3160 is pin-programmable to operate as either a 2TX/2RX RS-232 interface or a single RS-485/422 transceiver.

What is the function of the FAST pin?

The FAST pin controls the slew rate of the RS-232 transmitters and RS-485/422 drivers. Asserting FAST disables slew-rate limiting, allowing data rates up to 1Mbps for RS-232 and 10Mbps for RS-485/422. Deasserting FAST limits the slew rate to minimize EMI.

Does the device require an external negative voltage supply?

No, the MAX3162EAI incorporates an internal dual charge pump that generates the necessary negative voltage from a single +3.0V to +5.5V supply, eliminating the need for external bipolar power sources.