MAX5455EUD+T

Overview

The MAX5455EUD+T is a dual digital potentiometer IC from the MAX5450–MAX5455 family, manufactured by Analog Devices Inc./Maxim Integrated. It features two independent 3-terminal potentiometers with 256 digitally controlled wiper positions. The device operates on a single +2.7V to +5.5V supply and draws an ultra-low supply current of 0.1µA. Each potentiometer has an end-to-end resistance of 100kΩ with a temperature coefficient of 35ppm/°C. It utilizes an up/down interface for glitchless switching and includes a power-on reset that sets the wiper to midscale (position 127). The component is housed in a 14-pin TSSOP package and is rated for operation between -40°C and +85°C.

Feature Summary

• Dual 3-terminal potentiometers with 256 tap positions
• Ultra-low 0.1µA supply current
• +2.7V to +5.5V single-supply operation
• Glitchless switching via up/down interface
• Power-on reset sets wiper to midscale

Applications

• Mechanical potentiometer replacement
• Low-drift programmable-gain amplifiers
• Volume control circuits
• LCD screen adjustment
• Adjustable voltage references

Procurement Notes

Verify the 'T' suffix indicates reel packaging when sourcing. Confirm the 'E' designation corresponds to the extended industrial temperature range (-40°C to +85°C). Ensure the '+T' suffix aligns with RoHS compliance requirements for the specific procurement channel.

Selection Notes

Select this model for applications requiring dual independent variable resistors with precise digital control. The 100kΩ resistance value suits high-impedance signal paths. Verify compatibility with the system's logic levels, as input thresholds are defined relative to VDD. Consider the 14-pin TSSOP footprint constraints during PCB layout.

Part Context

This part belongs to the MAX545x family of dual digital potentiometers. The MAX5455 specifically denotes the 100kΩ variant with 3-terminal potentiometer configuration. Other family members include the MAX5450/MAX5452/MAX5454 (variable resistors) and variants with 10kΩ or 50kΩ resistance values.

Replacement Considerations

Direct replacements within the same family include MAX5455EUD without the tape/reel suffix if tube packaging is acceptable. For different resistance values, consider MAX5453EUD+T (50kΩ) or MAX5451EUD+T (10kΩ), maintaining the same pinout and interface.

FAQ

What is the default wiper position upon power-up?

The internal power-on reset circuitry automatically sets both wipers to the midscale position, which is position 127.

How does the up/down interface control the wiper?

With CS low, a high-to-low transition on INC increments the wiper position if U/D is high, or decrements it if U/D is low.

What is the maximum frequency for the INC input?

The maximum INC frequency is specified as 7 MHz.