Analog Devices Inc./Maxim Integrated MAX5450EUB+T

Overview

MAX5450EUB+T from Maxim Integrated is a dual 2-terminal digital potentiometer with 256-tap resolution, 10kΩ end-to-end resistance, and ultra-low 0.1µA supply current. It operates from +2.7V to +5.5V single supply and features power-on reset to midscale (position 127), making it suitable for precision adjustable linear regulators and low-power programmable gain amplifiers.

For engineers reviewing the MAX5450EUB+T datasheet, MAX5450EUB+T pinout, MAX5450EUB+T application, or MAX5450EUB+T equivalent, key selection criteria include its 10-pin µMAX® package, independent wiper control via up/down interface, 35ppm/°C end-to-end tempco, and guaranteed operation over –40°C to +85°C.

Technical Context

The MAX5450EUB+T implements two independent 2-terminal variable resistors using CMOS-based resistor arrays with 255 elements per channel. Each wiper is controlled by shared INC and U/D signals, with CS1/CS2 enabling independent channel selection.

Its internal architecture connects W1 to H1 and W2 to H2, configuring both channels as 2-terminal devices - distinct from the 3-terminal potentiometer mode of MAX5451/MAX5453/MAX5455. Power-on reset ensures deterministic startup at tap 127 without external initialization.

Key Specifications

Pinout & Package

MAX5450EUB+T is housed in a 10-pin µMAX® package (3mm × 3mm, 0.65mm pitch), optimized for space-constrained industrial and portable designs. Pin functions are validated per Maxim's official pin configuration diagram (Rev 2, 2/06).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual digital potentiometer applications.

Compared with AD5243BRMZ-10 and MCP41010-I/P, the MAX5450EUB+T offers lowest quiescent current (0.1µA), deterministic power-on state, and native dual-channel up/down control - reducing firmware overhead and PCB area in battery-powered industrial controls.

Availability

MAX5450EUB+T is available at Aetrix Electronics and suitable for adjustable linear regulators, programmable gain amplifiers, LCD screen adjustment, and impedance matching networks requiring stable component supply across extended temperature ranges.

Supply support for MAX5450EUB+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, with emphasis on low-power, high-reliability solutions.

The MAX5450–MAX5455 family was developed specifically for digitally replacing mechanical potentiometers in space- and power-constrained systems requiring stable, repeatable resistance tuning over temperature.

FAQ

What is the maximum operating voltage for MAX5450EUB+T?

The MAX5450EUB+T supports a supply voltage range of +2.7V to +5.5V. Absolute maximum rating is +6V on VDD relative to GND. Operation above +5.5V violates specifications and may cause permanent damage. The device draws only 0.1µA at +2.7V, making it ideal for low-voltage battery systems where MAX5450EUB+T maintains full functionality without derating.

Does MAX5450EUB+T support independent control of each potentiometer channel?

Yes - MAX5450EUB+T provides independent control via separate chip-select inputs CS1 and CS2. Driving CS1 low enables wiper adjustment of resistor 1 (W1/L1), while CS2 low enables resistor 2 (W2/L2). Both channels share U/D and INC signals, allowing synchronized or isolated tuning without external logic. This architecture is confirmed in the functional diagram (Figure 3) and pin description table for MAX5450EUB+T.

What is the temperature coefficient specification for MAX5450EUB+T?

The MAX5450EUB+T has an end-to-end resistor temperature coefficient of 35ppm/°C and a ratiometric temperature coefficient of 5ppm/°C. These values are measured across the full –40°C to +85°C operating range and apply directly to the 10kΩ version. The low ratiometric drift ensures stable gain ratios in amplifier configurations where MAX5450EUB+T is used in feedback dividers.

Is there a power-on reset function in MAX5450EUB+T, and what state does it set?

Yes - MAX5450EUB+T includes an internal power-on reset (POR) circuit that automatically initializes both wipers to midscale position (tap 127) at power-up. This behavior is guaranteed over the full –40°C to +85°C temperature range and eliminates the need for external reset sequencing or firmware initialization. The POR ensures predictable startup in systems using MAX5450EUB+T for critical bias or calibration functions.

Can MAX5450EUB+T be used in voltage-divider mode like a traditional potentiometer?

No - MAX5450EUB+T is configured exclusively as a dual 2-terminal variable resistor. Its internal connections tie W1 to H1 and W2 to H2, disabling true 3-terminal voltage-divider operation. This differs from MAX5451/MAX5453/MAX5455, which support voltage-divider mode. For applications requiring adjustable ratio division, MAX5450EUB+T must be used in series-variable-resistor configuration, such as in op-amp feedback paths or regulator feedback dividers.