Renesas X9258US24IZ-2.7T1

Overview

X9258US24IZ-2.7T1 from Intersil is a quad digital controlled potentiometer (XDCP™) integrating four 256-tap resistor arrays with volatile wiper counter registers and four non-volatile data registers per channel, operating from 2.7V to 5.5V analog supplies (V+/V−) and 2.7V–5.5V system supply (VCC), used for precision gain/offset trimming in dual-supply signal conditioning circuits.

For engineers reviewing the X9258US24IZ-2.7T1 datasheet, X9258US24IZ-2.7T1 pinout, X9258US24IZ-2.7T1 application, or X9258US24IZ-2.7T1 equivalent, key selection criteria include its −40°C to +85°C industrial temperature range, 24-pin SOIC package, 2-wire serial interface with hardware write protection (WP), and dual-polarity analog supply capability (±2.7V to ±5.5V).

Technical Context

The X9258US24IZ-2.7T1 implements four independent 255-segment resistor arrays, each with CMOS-switched wiper outputs (VW0–VW3) controlled by an 8-bit volatile Wiper Counter Register (WCR). Each array supports three-terminal potentiometer or two-terminal variable resistor configurations with VH/RH and VL/RL terminals referenced to V+ and V− respectively.

Its 2-wire interface uses open-drain SDA with pull-up, supports up to 400kHz clock frequency, and includes device addressing via A0–A3 pins (allowing up to 16 devices on one bus). Nonvolatile writes to data registers require high-voltage cycle timing (5–10ms) and are disabled when WP is high.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), RoHS-compliant, Pb-free (e3 termination finish), MSL level per device information page.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ100 and MCP42050-I/SL, the X9258US24IZ-2.7T1 uniquely delivers quad-channel, bipolar-supply digital potentiometry in one 24-pin SOIC - reducing BOM count, PCB area, and calibration complexity for multi-parameter analog systems requiring −40°C to +85°C operation.

Availability

X9258US24IZ-2.7T1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, medical instrumentation calibration, audio channel trimming, and programmable filter tuning requiring stable component supply across extended temperature ranges.

Supply support for X9258US24IZ-2.7T1 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, power management, and interface ICs for industrial, communications, and computing markets.

The X9258 product line delivers digitally programmable resistive elements for high-reliability analog trimming and calibration, designed specifically for systems needing nonvolatile storage, wide temperature operation, and dual-polarity analog supply compatibility.

FAQ

What is the absolute maximum voltage rating for the V+ and V− pins of the X9258US24IZ-2.7T1?

The X9258US24IZ-2.7T1 specifies absolute maximum ratings of +10V on V+ and −10V on V−, with a maximum differential (V+) − (V−) of 12V. Exceeding these limits may cause permanent damage. The recommended operating range remains ±2.7V to ±5.5V per the -2.7 suffix designation, and all potentiometer terminal voltages (VH, VL, VW) must stay strictly between V− and V+ at all times.

Does the X9258US24IZ-2.7T1 support true bipolar operation, and how is it implemented?

Yes, the X9258US24IZ-2.7T1 supports true bipolar operation via separate V+ and V− analog supplies. VH/RH terminals are referenced to V+, VL/RL to V−, enabling symmetric ±5V or asymmetric ±3V signal paths. This architecture allows use as a 3-terminal potentiometer across bipolar rails - for example, setting op-amp feedback ratios in rail-to-rail input/output stages without level-shifting circuitry.

How does the hardware write protect (WP) pin function on the X9258US24IZ-2.7T1?

The WP pin on the X9258US24IZ-2.7T1 is an active-low input that disables all nonvolatile writes to the data registers (DR0–DR3) when driven high. When WP = high, commands like Write Data Register or XFR WCR to DR are ignored. WP = low enables those operations. This provides physical-level protection against unintended calibration erasure during firmware updates or system resets.

What is the wiper response time after issuing a Write Wiper Counter Register command to the X9258US24IZ-2.7T1?

After issuing a Write Wiper Counter Register command, the X9258US24IZ-2.7T1 achieves full wiper settling in ≤10µs (tWRL), measured from instruction completion to stable VW output. This applies to direct writes, register transfers, and increment/decrement operations. The response is independent of supply ramp rate once VCC, V+, and V− are stable - critical for real-time trimming in closed-loop systems.

Can the X9258US24IZ-2.7T1 be used as a two-terminal variable resistor, and what design considerations apply?

Yes, the X9258US24IZ-2.7T1 can operate as a two-terminal variable resistor by connecting either VH/RH or VL/RL to the wiper (VW) terminal, leaving the other end open. Design considerations include limiting wiper current to ±7.5mA (per datasheet IW spec), ensuring voltage across the selected segment stays within V− to V+, and accounting for 40Ω typical wiper resistance in low-impedance paths - especially relevant in current-source or transconductance applications.