Analog Devices Inc./Maxim Integrated MAX5477EUD+

Overview

The MAX5477EUD+ from Maxim Integrated is a dual, nonvolatile, 256-tap, I²C-interface digital potentiometer in 14-pin TSSOP package, providing 10kΩ end-to-end resistance, ±0.5 LSB DNL (voltage-divider mode), and 70ppm/°C end-to-end temperature coefficient. It replaces mechanical potentiometers in programmable gain amplifiers, LCD contrast control, and volume adjustment circuits with EEPROM-based power-on wiper recall.

For engineers reviewing the MAX5477EUD+ datasheet, MAX5477EUD+ pinout, MAX5477EUD+ application, or MAX5477EUD+ equivalent, this page delivers verified electrical specs, I²C timing compliance (400kbps), wiper settling time (325ns), supply current (1µA max), and dual-potentiometer routing constraints for precision analog tuning.

Technical Context

The MAX5477EUD+ integrates two independent 256-position resistor arrays with dedicated high (HA/HB), low (LA/LB), and wiper (WA/WB) terminals per channel. Its internal 16-bit NV memory stores wiper positions across power cycles, with write protection controlled via the WP pin.

It uses a fast-mode I²C interface (400kbps) with three address inputs (A0–A2) enabling up to eight devices on one bus. The device operates from +2.7V to +5.25V and supports voltage-divider and variable-resistor configurations with guaranteed ±1 LSB INL and ±0.5 LSB DNL in divider mode.

Key Specifications

Pinout & Package

MAX5477EUD+ is housed in a 14-pin TSSOP (4.4mm × 5mm) package with exposed pad not connected. Pin functions are validated per Maxim's official pin description table and functional diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP4641T-103E/ST, the MAX5477EUD+ uniquely combines hardware write protection, guaranteed 10ppm/°C ratiometric tempco, and I²C address flexibility-making it optimal for unattended, calibration-critical industrial systems where EEPROM integrity and analog accuracy are non-negotiable.

Availability

MAX5477EUD+ is available at Aetrix Electronics and suitable for programmable gain amplifiers, LCD contrast control, and volume adjustment applications requiring stable component supply, long-term calibration retention, and industrial temperature operation.

Supply support for MAX5477EUD+ 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 high-performance analog and mixed-signal ICs for precision, power, and interface applications.

The MAX5477EUD+ belongs to Maxim's digital potentiometer product line, engineered specifically for replacing mechanical trimmers in calibration-critical analog circuits where nonvolatile storage, low tempco, and I²C simplicity are essential.

FAQ

What is the maximum I²C clock frequency supported by the MAX5477EUD+?

The MAX5477EUD+ supports fast-mode I²C operation up to 400kHz. This is confirmed in the Electrical Characteristics table under "SCL Clock Frequency" with f_SCL = 400kHz (max). At this rate, the device reliably processes wiper position updates and EEPROM writes while maintaining timing margins across –40°C to +85°C. The MAX5477EUD+ does not support high-speed I²C (3.4MHz).

Does the MAX5477EUD+ retain its wiper position after power cycling?

Yes-the MAX5477EUD+ automatically recalls its last-stored wiper position from internal nonvolatile EEPROM upon power-up. This behavior is enabled by default and requires no host intervention. The EEPROM is rated for 50 years of data retention at +85°C and 200,000 store cycles, ensuring reliable calibration persistence in MAX5477EUD+ deployments.

Can both potentiometer channels of the MAX5477EUD+ be updated simultaneously?

No-the MAX5477EUD+ does not support atomic dual-channel updates. Each wiper (WA and WB) is controlled independently via separate I²C command bytes (see Table 3). To synchronize settings, the host must issue sequential writes-one for Channel A, then one for Channel B-with timing coordinated in firmware. There is no broadcast or group-write command in the MAX5477EUD+ protocol.

What is the wiper resistance specification for the MAX5477EUD+?

The wiper resistance (R_W) for the MAX5477EUD+ is specified as 325Ω (min) to 675Ω (max) at TA = +25°C. This value is measured per Note 5 in the datasheet using defined source currents. It directly impacts insertion loss and loading effects when the wiper drives high-impedance nodes-critical when using MAX5477EUD+ in unity-gain buffer feedback paths.

Is the MAX5477EUD+ RoHS-compliant and lead-free?

Yes-the "+" suffix in MAX5477EUD+ explicitly denotes a lead(Pb)-free and RoHS-compliant package, as stated in the Ordering Information section. The 14-pin TSSOP package meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and is qualified for standard reflow soldering profiles up to +260°C peak temperature.