MAX3172EAI+

Overview

The MAX3172EAI+ is a +3.3V multiprotocol cable terminator and transceiver in a 28-pin SSOP package, operating from -40°C to +85°C. It integrates five software-selectable termination networks supporting V.11 (100Ω differential), V.35 (T-network), and V.28/V.10 (high-Z). The device includes a 1Tx/1Rx transceiver for handshake signals, selectable between V.10 and V.28 modes. Electrical characteristics include a supply current of 200µA typical, data rates up to 240kbps, and receiver glitch rejection of 10µs. Logic inputs are compatible with 3V/5V systems.

Feature Summary

• Software-selectable multiprotocol cable termination networks replace discrete resistors and relays.
• Integrated 1Tx/1Rx multiprotocol transceiver designed for serial handshake signal I/O.
• Certified TBR-1 and TBR-2 compliant for specific network configurations.
• Transmitter outputs fault protected to ±15V to tolerate cable miswiring.

Applications

• Data networking PCI cards
• CSU and DSU telecommunications equipment
• Data routers

Procurement Notes

Verify the component status as discontinued or end-of-life through official manufacturer channels before design finalization. Confirm that the E suffix corresponds to the industrial temperature range (-40°C to +85°C) required for the application environment. Ensure compatibility with the MAX3170/MAX3171 chipset if a complete interface solution is needed.

Selection Notes

Select the MAX3172EAI+ over the MAX3174 variant when receiver input deglitching is necessary for unterminated operation at lower frequencies. Verify that the system requires a single-chip solution combining termination logic and handshake transceivers. Ensure the design supports the required V+ and V- supply levels generated by an external charge pump.

Part Context

This component belongs to the MAX317x family of +3.3V multiprotocol interfaces. It functions alongside the MAX3170 (clock/data transceiver) and MAX3171/MAX3173 (control transceiver/charge pump) to form a complete DTE/DCE port. The EAI+ suffix indicates the extended temperature range and lead-free packaging.

Replacement Considerations

Public confirmed substitute part numbers: None identified.

FAQ

What is the purpose of the 10µs receiver input deglitching?

The 10µs deglitching on the MAX3172 allows for glitch-free operation in unterminated systems by blocking high-frequency noise with bit periods less than 5µs while passing low-frequency signals greater than 15µs.

How does the device handle no-cable mode?

When all mode-select inputs (M0, M1, M2) are HIGH, the device enters no-cable mode, disabling driver/receiver bias circuitry and dropping supply current below 200µA while placing termination networks in V.11 mode.

What termination impedance does the V.11 mode provide?

In V.11 mode, the termination networks present a typical differential-mode impedance of 104Ω (range 100Ω to 110Ω) to terminate RS-422, RS-530, and related protocols.