MAX3170CAI+

Overview

The MAX3170CAI+ is a multiprotocol transceiver operating from a +3.3V single supply, featuring three drivers and three receivers. It supports V.28 (RS-232), V.11 (RS-449/V.36, EIA530, EIA530-A, X.21), and V.35 protocols. The device operates within a temperature range of 0°C to +70°C and utilizes a 28-pin SSOP package. Electrical characteristics include a typical supply current of 1mA in no-cable mode and up to 510mA in V.35 full-load mode. Transmitter outputs are fault protected to ±15V.

Feature Summary

• Supports multiple serial interface protocols including V.28, V.11, and V.35 via software-selectable mode pins.
• Integrates an internal dual charge pump to generate positive and negative supplies from a single +3.3V source.
• Features true fail-safe receiver operation ensuring a logic-high output when inputs are open or shorted.
• Includes thermal shutdown circuitry to protect drivers against excessive power dissipation.

Applications

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

Procurement Notes

Verify the component status with the manufacturer before procurement. Confirm that the specific ordering suffix matches the required package type and temperature range. Ensure compatibility with existing system voltage levels and protocol requirements. Check for any recent product lifecycle changes or obsolescence notices.

Selection Notes

Select this component for designs requiring a single-chip solution for high-speed clock and data signals across multiple serial standards. Consider pairing with MAX3171/MAX3173 for control signals and MAX3172/MAX3174 for termination networks. Evaluate the need for software-selectable DTE/DCE configuration and cable-selectable mode capabilities.

Part Context

The MAX3170 forms part of a complete software-selectable DTE or DCE interface port chipset alongside the MAX3171, MAX3173, MAX3172, and MAX3174. While the MAX3170 handles high-speed clock and data, companion devices manage control signals and termination. This family enables flexible multiprotocol communication interfaces.

Replacement Considerations

Direct substitutes include the MAX3171CAI+ and MAX3170CAI+. Verify pinout and functional equivalence before replacement. Parameter-equivalent options may require circuit adjustments.

FAQ

How is the no-cable mode activated?

No-cable mode is entered when all mode select pins (M0, M1, and M2) are pulled high or left unconnected. In this state, supply current drops to 1mA and all transmitter/receiver outputs are disabled.

What is the function of the DCE/DTE pin?

The DCE/DTE pin selects the interface mode. A logic HIGH selects DCE mode, enabling driver T3, while a logic LOW selects DTE mode, disabling driver T3 and enabling receiver R1.

How does the device handle receiver input faults?

The MAX3170 features true fail-safe receivers that guarantee a logic-high receiver output when the receiver inputs are shorted, open, or connected to a terminated line with all drivers disabled.