Renesas X9250US24IT1

Overview

X9250US24IT1 from Intersil is a quad digitally controlled potentiometer (XDCP™) with 256-tap resolution per channel, SPI serial interface, dual ±2.7V to ±5.5V analog supplies (V+/V−), and 50kΩ end-to-end resistance. It integrates nonvolatile data registers (DR0–DR3), wiper counter registers (WCR), and hardware write protection (WP) for precision analog control in mixed-signal systems.

For engineers reviewing the X9250US24IT1 datasheet, X9250US24IT1 pinout, X9250US24IT1 application, or X9250US24IT1 equivalent, key selection criteria include its 24-pin SOIC package, -40°C to +85°C operating range, 40Ω typical wiper resistance at 5V, 100,000-cycle endurance, and support for three-terminal potentiometer or two-terminal variable resistor configurations.

Technical Context

The X9250US24IT1 implements four independent 255-segment resistor arrays, each controlled by an 8-bit volatile Wiper Counter Register decoded to select one of 256 tap points. Each array features VH/RH, VL/RL, and VW/RW terminals mirroring mechanical potentiometer behavior, with CMOS switches enabling precise wiper positioning via SPI commands.

Its SPI interface supports full-duplex communication with rising-edge data latching on SI and falling-edge data output on SO. The device uses a 2-bit slave address (A0/A1), includes HOLD for serial pause/resume, and requires CS low to enable active mode - with automatic power-up recall of DR0 into the WCR for deterministic startup behavior.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), RoHS-compliant, Pb-free plus anneal option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP42050-I/P, the X9250US24IT1 uniquely supports true bipolar analog operation via dedicated V+/V− supplies, includes hardware write protection and global register transfer - making it optimal for precision, field-reconfigurable analog systems requiring long-term calibration stability.

Availability

X9250US24IT1 is available at Aetrix Electronics and suitable for industrial power supplies, medical sensor interfaces, test equipment calibration, and audio processing systems requiring stable component supply and long-lifecycle support.

Supply support for X9250US24IT1 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 manufacturer specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9250US24IT1 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in systems demanding programmable, nonvolatile, and repeatable analog adjustments.

FAQ

What is the operating temperature range for the X9250US24IT1?

The X9250US24IT1 is rated for industrial operation from -40°C to +85°C. This range is confirmed in the Ordering Information table on page 2 of FN8165 Rev.3.00, where "X9250US24I" denotes the -40°C to +85°C grade. The "T1" suffix indicates tape-and-reel packaging but does not alter thermal specifications. X9250US24IT1 maintains full functionality across this range, including accurate wiper positioning and nonvolatile register retention.

Does the X9250US24IT1 support true bipolar analog operation?

Yes, the X9250US24IT1 supports true bipolar analog operation via dedicated V+ and V− supply pins, rated from ±2.7V to ±5.5V. This allows the internal resistor arrays to handle AC-coupled or dual-rail signals directly - unlike single-supply DCPs. The datasheet specifies that VH/RH pins must remain ≤ V+ and VL/RL ≥ V−, confirming symmetrical analog signal swing capability. X9250US24IT1 leverages this to enable applications such as offset trimming in op-amps with split supplies.

How many nonvolatile registers does the X9250US24IT1 provide per potentiometer?

The X9250US24IT1 provides four 8-bit nonvolatile Data Registers (DR0–DR3) for each of its four potentiometers. As stated on page 4 of FN8165 Rev.3.00, "Each potentiometer has four 8-bit nonvolatile Data Registers." These registers store wiper positions or system parameters with 100-year data retention. X9250US24IT1 loads DR0 into the volatile Wiper Counter Register (WCR) at power-up, ensuring deterministic startup behavior without host intervention.

What is the maximum SPI clock frequency supported by the X9250US24IT1?

The X9250US24IT1 supports a maximum SPI clock frequency of 2.0 MHz, as specified in the AC Timing section (page 13 of FN8165 Rev.3.00). This limit applies to both read and write operations, including increment/decrement sequences. The timing parameters tWH and tWL require minimum 200 ns high/low times, and tCYC mandates a 500 ns minimum cycle time - all consistent with 2 MHz operation. X9250US24IT1 maintains reliable communication at this rate under recommended supply and load conditions.

Can the X9250US24IT1 be used as a two-terminal variable resistor?

Yes, the X9250US24IT1 can be configured as a two-terminal variable resistor by connecting either VH/RH or VL/RL to the wiper VW/RW, leaving the other terminal open or grounded depending on topology. Page 2 of the datasheet explicitly states: "The XDCP can be used as a three-terminal potentiometer or as a two-terminal variable resistor in a wide variety of applications." X9250US24IT1's 50kΩ end-to-end resistance and 40Ω typical wiper resistance make it suitable for current-limiting or bias-setting roles where a tunable series resistance is required.