Renesas X9258US24IZ

Overview

X9258US24IZ from Intersil (now Renesas) is a quad digital potentiometer IC with 256-tap resolution per channel, dual ±2.7V to ±5.5V analog supplies (V+/V−), 2-wire I²C-compatible interface, and nonvolatile wiper position storage in four 8-bit data registers per pot. It operates across −40°C to +85°C and delivers 50 kΩ end-to-end resistance with <100 Ω typical wiper resistance at ±5 V.

For engineers reviewing the X9258US24IZ datasheet, X9258US24IZ pinout, X9258US24IZ application, or X9258US24IZ equivalent, this device supports precision analog trimming, programmable gain/offset control, and multi-channel bias adjustment in mixed-signal systems where temperature-stable, reconfigurable resistive elements are required without mechanical wear.

Technical Context

The X9258US24IZ implements four independent resistor arrays-each with 255 segments and 256 tap points-controlled by volatile 8-bit Wiper Counter Registers (WCR) and backed by four nonvolatile 8-bit Data Registers (DR0–DR3) per channel. Power-up automatically loads DR0 into each WCR.

Its 2-wire serial interface supports slave addressing via A0–A3 pins (up to 16 devices), hardware write protection via WP, and increment/decrement mode for real-time fine-tuning. All register writes to DRs require high-voltage write cycles (5–10 ms), while WCR updates occur in <10 µs.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), RoHS-compliant, M24.3 footprint. Pin pitch: 1.27 mm. Thermal resistance θ_JA = 46°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP42050-I/SL, the X9258US24IZ uniquely supports true bipolar analog operation, hardware write protection, and four independent nonvolatile registers per channel-making it the only option among the three qualified for industrial-grade recalibration and mixed-signal trimming where supply isolation and data integrity are mandatory.

Availability

X9258US24IZ is available at Aetrix Electronics and suitable for industrial sensor conditioning, medical instrumentation calibration, laser diode bias control, and audio signal processing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9258US24IZ 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 (acquired by Renesas Electronics in 2017) is a semiconductor company specializing in high-performance analog and power management ICs for industrial, communications, and computing markets.

The X9258US24IZ belongs to Intersil's XDCP™ (eXternally Controlled Digital Potentiometer) family, designed specifically for replacing mechanical potentiometers in precision analog systems requiring programmability, nonvolatility, and robustness against vibration, contamination, and wear.

FAQ

What is the operating temperature range for the X9258US24IZ?

The X9258US24IZ is rated for operation from −40°C to +85°C, as confirmed in the Ordering Information table and Operating Conditions section of the FN8168 datasheet. This extended industrial temperature range makes it suitable for deployment in harsh environments such as factory automation controllers and outdoor instrumentation where thermal cycling is expected.

Does the X9258US24IZ support true bipolar analog operation?

Yes, the X9258US24IZ supports true bipolar analog operation via separate V+ and V− supply pins, rated from ±2.7 V to ±5.5 V. This allows the device to condition AC signals centered at 0 V or implement precision negative feedback networks-unlike single-supply digital pots that cannot handle signals below ground.

How many nonvolatile registers does the X9258US24IZ provide per potentiometer channel?

The X9258US24IZ provides four nonvolatile 8-bit Data Registers (DR0–DR3) per potentiometer channel, totaling 16 registers. DR0 is automatically loaded into the Wiper Counter Register (WCR) at power-up, ensuring repeatable startup behavior without host intervention.

What is the maximum clock frequency supported by the X9258US24IZ 2-wire interface?

The X9258US24IZ supports standard-mode I²C operation up to 400 kHz, as specified in the AC Timing table (f_SCL = 400 kHz max). It is not compatible with fast-mode plus (1 MHz) or high-speed mode, and timing parameters like t_HIGH, t_LOW, and t_SU:DAT must be strictly observed for reliable communication.

Can the X9258US24IZ wiper position be adjusted in real time without issuing full I²C commands?

Yes-the X9258US24IZ supports Increment/Decrement mode: after issuing the dedicated command byte, each SCL pulse moves the selected wiper one tap toward VH (SDA HIGH) or VL (SDA LOW). This enables real-time analog tuning without repeated address/command overhead, reducing host processor load during dynamic calibration.