Renesas X9261US24

Overview

X9261US24 from Intersil is a dual digitally-controlled potentiometer (XDCP™) IC with 256-tap resolution per channel, 50 kΩ end-to-end resistance, SPI serial interface, and nonvolatile wiper position storage. It operates from a single 5 V ±10% supply, delivers <5 µA standby current, and is housed in a 24-lead SOIC package for precision analog trimming in industrial control and sensor signal conditioning.

For engineers reviewing the X9261US24 datasheet, X9261US24 pinout, X9261US24 application, or X9261US24 equivalent, this device supports programmable gain/offset adjustment, power-on recall of wiper settings, and dual independent potentiometer operation-critical for embedded systems requiring repeatable analog configuration without external EEPROM.

Technical Context

The X9261US24 integrates two independent 256-tap resistor arrays with CMOS switch-based wiper control, each managed by an 8-bit volatile Wiper Counter Register (WCR) and four nonvolatile Data Registers (DR0–DR3). Its SPI interface supports read/write/transfer operations with device addressing via A1/A0 pins and hardware write protection via WP.

Each potentiometer functions as either a three-terminal voltage divider or two-terminal variable resistor, with wiper resistance of 150 Ω typical at 5 V, absolute linearity ±1 MI, and ratiometric temperature coefficient of 20 ppm/°C-enabling stable performance across 0°C to +70°C commercial operation.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), RoHS-compliant Pb-free plus anneal finish (M24.3 drawing).

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9261US24, ISL22424 offers simpler I²C integration but sacrifices dual-channel independence and SPI timing control, while AD5242BRUZ10 provides compact dual-pot functionality at lower resistance but omits hardware write protection and power-on recall from nonvolatile memory.

Availability

X9261US24 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power management, and audio signal processing requiring stable component supply and long-term configuration retention.

Supply support for X9261US24 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

Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog and power management ICs for industrial, computing, and communications markets.

The X9261US24 belongs to Intersil's XDCP™ family of digitally-controlled potentiometers, designed specifically for replacing mechanical trimmers in automated test equipment, factory-calibrated instruments, and field-upgradable analog subsystems.

FAQ

What is the operating temperature range for the X9261US24?

The X9261US24 is rated for commercial operation from 0°C to +70°C. Its specifications-including end-to-end resistance tolerance, linearity, and wiper response time-are guaranteed across this range. While absolute maximum ratings extend to +135°C, functional performance outside 0°C–70°C is not characterized or warranted per the datasheet.

Does the X9261US24 require external components to operate as a basic potentiometer?

No, the X9261US24 operates autonomously with only VCC, VSS, and SPI interface connections. No external capacitors, pull-ups, or level shifters are required for standard 5 V operation. The RH/RL/RW terminals connect directly to circuit nodes, and internal power-on recall eliminates need for host initialization of wiper position.

How does the hardware write protect (WP) pin function on the X9261US24?

When the WP pin is held LOW, the X9261US24 blocks all nonvolatile writes to its Data Registers (DR0–DR3), preventing accidental overwrites of calibrated settings. Volatile Wiper Counter Register (WCR) updates remain enabled. WP must be HIGH to perform store operations; it has no effect on read or transfer instructions.

Can the X9261US24 be used in a two-wire (I²C-like) SPI configuration?

Yes-the X9261US24 supports bidirectional SPI communication where SO and SI share a single trace. Its SO pin is tri-state and driven only during read cycles, allowing wire-OR connection with SI. This reduces MCU pin count while maintaining full read/write capability, provided proper timing margins and slew rate control are observed.

What is the wiper response time after issuing a load instruction to the X9261US24?

The X9261US24 exhibits a wiper response time of 5–10 µs (tWRL) after completion of any load instruction-including Write WCR, XFR DR→WCR, or Power-on Recall. This delay reflects internal switch settling and is independent of SPI clock speed, ensuring predictable analog settling in closed-loop systems.