Renesas X9259UV24

Overview

X9259UV24 from Intersil (now Renesas) is a quad digitally controlled potentiometer (XDCP™) IC implementing four independent 256-tap, 50kΩ end-to-end resistive elements with volatile wiper counter registers and nonvolatile data registers, operating from 2.7V to 5.5V supply, used for precision gain control in audio amplifiers and DC bias trimming in voltage regulators.

For engineers reviewing the X9259UV24 datasheet, X9259UV24 pinout, X9259UV24 application, or X9259UV24 equivalent, this page delivers verified specifications, validated TSSOP-24 pin mapping, confirmed 2-wire interface behavior, and real-world circuit-level use cases - all tied explicitly to the X9259UV24Z-2.7 ordering variant.

Technical Context

The X9259UV24 integrates four monolithic CMOS DCPs, each with RH/RL/RW terminals, an 8-bit volatile Wiper Counter Register (WCR), and four 8-bit nonvolatile Data Registers (DR00–DR33). Wiper position is set via 2-wire serial interface using device address pins A0–A3 and hardware write-protect (WP) control.

It supports three-byte instructions (e.g., Read/Write WCR, Read/Write DR) and two-byte transfer commands (e.g., DR→WCR, Global XFR), with incremental/decremental wiper adjustment enabled by SCL clocking while holding SDA high/low. Power-up loads DR#0 into corresponding WCR.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (RoHS-compliant, M24.173 drawing), surface-mount, 0.65mm pitch, 7.8mm × 4.4mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42050-I/SL, the X9259UV24 uniquely combines quad 50kΩ DCPs, hardware write protection, four nonvolatile registers per channel, and global transfer capability - making it optimal for compact, self-contained, field-calibratable analog subsystems.

Availability

X9259UV24 is available at Aetrix Electronics and suitable for audio volume control, DC bias trimming, voltage regulator feedback, and filter gain adjustment requiring stable component supply and long-term calibration integrity.

Supply support for X9259UV24 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

Renesas Electronics (formerly Intersil) is a global semiconductor leader specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The X9259UV24 belongs to the XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in precision analog signal conditioning and calibration-critical systems.

FAQ

What is the exact package type and footprint for X9259UV24?

The X9259UV24 is supplied in a 24-lead TSSOP package (RoHS-compliant, JEDEC MO-153 variant, drawing M24.173), measuring 7.8mm × 4.4mm with 0.65mm lead pitch. It is not pin-compatible with the SOIC version (X9259US24Z-2.7) due to different pad layout and thermal pad absence.

Does X9259UV24 support true I²C communication, and what are its timing limits?

Yes, X9259UV24 supports standard 2-wire (I²C-compatible) communication with maximum clock frequency of 400kHz, t_AA = 0.9µs data valid delay, and t_BUF = 1200ns bus free time. It uses open-drain SDA and requires external pull-ups; it does not support clock stretching or 10-bit addressing.

How does the hardware write-protect (WP) pin function on X9259UV24?

When WP is driven LOW, the X9259UV24 blocks all nonvolatile writes to its Data Registers (DR00–DR33), including Write DR and XFR DR→WCR commands. Volatile operations (Read/Write WCR, Increment/Decrement) remain fully functional. WP has no effect on power-up loading of DR#0 into WCR.

Can X9259UV24 be used as a two-terminal variable resistor, and what are the limitations?

Yes, X9259UV24 can operate as a two-terminal variable resistor by connecting RH and RL to fixed potentials and using RW as the adjustable node. Maximum wiper current is ±3mA, and power rating per pot is 50mW. Exceeding these limits risks parametric shift or permanent damage.

What happens to wiper positions during power-up, and how is default behavior configured?

At power-up, the X9259UV24 automatically loads the contents of DR#0 (e.g., DR00, DR10, DR20, DR30) into the corresponding Wiper Counter Registers (WCR0–WCR3). This behavior is fixed and cannot be disabled; DR#0 values must be pre-programmed to establish desired startup states.