MAX7358EUG+T

Analog Switches - Special Purpose Overview

The MAX7358EUG+T is a 1-to-8 I2C bus switch and multiplexer manufactured by Analog Devices Inc. (formerly Maxim Integrated). It expands the main I2C bus to eight extended buses, enabling isolation of devices with slave address conflicts. The device operates on a supply voltage ranging from 2.3V to 5.5V and supports both Standard-Mode (100kbps) and Fast-Mode (400kbps) I2C interfaces. It features enhanced mode capabilities including bus lock-up detection, preconnection wiggle tests, and interrupt notification via the bidirectional RST/INT pin. The component is available in a 24-pin TSSOP package and is specified for operation over an extended temperature range of -40°C to +85°C.

Analog Switches - Special Purpose Feature Summary

• Enhanced mode provides built-in timer monitoring for bus lock-up conditions and automatic flush-out sequences.
• Bidirectional RST/INT pin serves as both hardware reset input and active-low interrupt output for fault notification.
• Preconnection check toggles downstream clock and data lines to verify the bus is not locked high before connection.
• Logic-level translation allows compatibility across different voltage domains within the supported supply range.

Analog Switches - Special Purpose Applications

• Servers
• RAID systems
• Base Stations
• Control and Automation Devices
• Networking Equipment

Analog Switches - Special Purpose Procurement Notes

Verify the specific ordering suffix EUG+T corresponds to the 24-pin TSSOP package configuration. Confirm that the lead-free/RoHS-compliant status aligns with current regulatory requirements for your assembly process. Ensure the supplier documentation references the correct Analog Devices or Maxim Integrated datasheet revision to validate the enhanced mode functionality and electrical characteristics.

Analog Switches - Special Purpose Selection Notes

Select this component when bus isolation and lock-up recovery are required, distinguishing it from the basic-mode MAX7356. The MAX7358 powers up in basic mode; ensure the host controller can execute the special I2C command sequence to enable enhanced features like lock-up detection. Verify that the 5.5V-tolerant inputs match the voltage levels of the connected I2C peripherals.

Analog Switches - Special Purpose Part Context

This part belongs to the MAX7356/MAX7357/MAX7358 family of 1-to-8 I2C switches. While all three share the same physical package and basic switching functions, the MAX7358 is distinct for offering enhanced diagnostic modes with lock-up detection and interrupt generation, unlike the MAX7356 which lacks these features entirely.

Analog Switches - Special Purpose Replacement Considerations

The MAX7357EUG+ is a direct functional substitute within the same package, differing primarily in its default power-up state (enhanced mode versus basic mode for the MAX7358). Both support identical lock-up detection and notification features.

Analog Switches - Special Purpose FAQ

How does the MAX7358 detect a bus lock-up condition?

The device monitors the clock and data lines of extended buses using a built-in timer. If either line remains low for more than 25ms, a lock condition is detected.

What is the purpose of the preconnection wiggle test?

The wiggle test toggles the downstream clock and data lines low then high to ensure the downstream bus is not stuck high before connecting it to the host bus.

Can the MAX7358 operate without enabling enhanced mode?

Yes, the MAX7358 powers up in basic mode where it functions solely as a collection of analog switches. Enhanced features require a specific I2C command sequence to activate.