X9455UV24I-2.7

Digital Potentiometers Overview

The X9455UV24I-2.7 is a dual two-wiper digitally controlled potentiometer (XDCP) manufactured by Renesas Electronics Corporation, formerly Intersil. It integrates two independent resistor arrays on a monolithic CMOS IC, with each array containing 255 resistive elements providing 256 tap points and 0.4% resolution. The total resistance for this specific variant is 50 kΩ. Each wiper position is managed via volatile Wiper Counter Registers (WCR) linked to four non-volatile Data Registers (DR). Power-on recall automatically loads the Level 0 data registers into the WCRs upon initialization. The device supports both a 2-wire serial interface and an Up/Down interface for wiper control.

Digital Potentiometers Feature Summary

• Dual two-wiper architecture with 256 discrete tap points per potentiometer.
• Non-volatile storage of wiper positions with power-on recall capability.
• Supports 2-wire serial interface (I²C compatible) and Up/Down interface.
• Hardware write protect pin (WP) for securing non-volatile memory.

Digital Potentiometers Applications

• Programming bias voltages in analog circuits.
• Configuring window comparators.
• Implementing three-resistor programmable networks.

Digital Potentiometers Procurement Notes

This component is designated as Not Recommended for New Designs (NRND) with no recommended replacement provided by the manufacturer. Verification of current availability requires direct contact with technical support or authorized distributors, as standard inventory channels may not list active stock. Compliance with RoHS standards is indicated for Pb-free plus anneal variants.

Digital Potentiometers Selection Notes

Select the X9455UV24I-2.7 when a 50 kΩ total resistance is required for dual-channel applications needing precise digital adjustment. Ensure the design accommodates the 24-pin TSSOP package dimensions. Verify that the system voltage remains within the 2.7V to 5.5V operating range and that the interface logic matches the 2-wire or Up/Down requirements.

Digital Potentiometers Part Context

The X9455 belongs to the XDCP™ family of digitally controlled potentiometers. This specific part number denotes the 50 kΩ resistance version (indicated by 'U') packaged in a 24-lead Thin Shrink Small Outline Package (TSSOP) with industrial temperature rating (-40°C to +85°C). The suffix '-2.7' specifies the minimum supply voltage requirement.

Digital Potentiometers Replacement Considerations

The datasheet explicitly states there is no recommended replacement for this NRND component. Engineers must evaluate legacy stock or redesign using alternative dual-digital potentiometer solutions if new production is required.

Digital Potentiometers FAQ

How does the device handle wiper position retention during power cycles?

Upon power-up, the contents of the Level 0 non-volatile Data Registers (DR0A0, DR0B0, DR1A0, DR1B0) are automatically loaded into their corresponding volatile Wiper Counter Registers, restoring the previously saved wiper positions.

What is the function of the WP pin?

The Hardware Write Protect (WP) pin, when set low, disables all write operations to the non-volatile DCP Data Registers, protecting stored wiper positions from accidental modification via either the 2-wire interface or the Up/Down interface.

How many devices can be addressed on a single 2-wire bus?

A maximum of 8 devices may occupy the 2-wire serial bus, determined by the combination of the fixed Device Type Identifier and the three address pins (A2, A1, A0).