Renesas X9258US24IZT2

Overview

X9258US24IZT2 from Intersil (now Renesas) is a quad digital potentiometer IC integrating four independent 256-tap resistor arrays with volatile wiper counter registers and nonvolatile data registers, operating from dual analog supplies (±2.7V to ±5.5V) and a 2.7V–5.5V system supply, delivering 0.4% resolution and <5µA standby current for precision biasing in mixed-signal instrumentation.

For engineers reviewing the X9258US24IZT2 datasheet, X9258US24IZT2 pinout, X9258US24IZT2 application, or X9258US24IZT2 equivalent, key selection criteria include 2-wire interface compatibility, dual-supply analog rail support (V+/V−), 50kΩ end-to-end resistance, industrial temperature range (−40°C to +85°C), and hardware write-protect (WP) functionality.

Technical Context

The X9258US24IZT2 implements four independent DCPs using 255-resistor-segment linear arrays with CMOS switch-based wiper selection controlled by an 8-bit Wiper Counter Register (WCR). Each potentiometer supports direct WCR writes, register-to-WCR transfers, and real-time increment/decrement via SCL edge-triggered commands.

It uses a standard I²C-compatible 2-wire bus with slave address format 0101[A3:A0], supports ACK polling during nonvolatile writes (tWR = 5–10 ms), and features hardware write protection (WP pin low disables DR writes). Power-up automatically loads DR0 into each WCR.

Key Specifications

Pinout & Package

24-lead SOIC (300 mil) package with exposed pad not present; RoHS-compliant matte tin finish; MSL Level 3 per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP41HV51-503E/ST, the X9258US24IZT2 uniquely combines quad-channel integration, true bipolar analog supply support (V+/V−), hardware write protection, and on-chip nonvolatile storage - making it optimal for industrial and medical systems requiring robust, field-programmable analog tuning without external memory or level shifters.

Availability

X9258US24IZT2 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical instrumentation biasing, and programmable power supply feedback requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9258US24IZT2 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 X9258 product line delivers digitally programmable analog front-end components optimized for precision calibration, sensor signal conditioning, and adaptive power control in harsh-environment applications.

FAQ

What is the maximum clock frequency supported by the X9258US24IZT2 2-wire interface?

The X9258US24IZT2 supports a maximum I²C-compatible clock frequency of 400 kHz, with timing parameters including tCYC = 2500 ns, tHIGH ≥ 600 ns, and tLOW ≥ 1300 ns. This allows reliable communication with standard microcontrollers while maintaining noise immunity in electrically noisy industrial environments. The X9258US24IZT2 does not support fast-mode plus (1 MHz) or high-speed mode.

Does the X9258US24IZT2 require power supply sequencing between VCC, V+, and V−?

No, the X9258US24IZT2 has no strict sequencing requirement: all three supplies (VCC, V+, V−) must reach their final values within 1 ms of each other. However, analog pin voltages must remain within V− and V+ at all times. The wiper position recall from DR0 occurs only after all supplies stabilize. This simplifies power design in systems with independent LDOs or charge pumps.

How many nonvolatile data registers does each potentiometer in the X9258US24IZT2 have?

Each of the four potentiometers in the X9258US24IZT2 has four independent 8-bit nonvolatile data registers (DR0–DR3), totaling 16 registers. DR0 is automatically loaded into the corresponding Wiper Counter Register (WCR) at power-up. All DRs support 100,000 write cycles and retain data for 100 years at +25°C - enabling long-term calibration storage without external memory.

Can the X9258US24IZT2 operate with unipolar analog supplies?

Yes - the X9258US24IZT2 supports unipolar operation: V− can be tied to VSS (0 V) while V+ operates from +2.7V to +5.5V, enabling use as a standard 0–V+ rheostat or potentiometer. In this configuration, VLx pins connect to ground, VHx to V+, and VWx outputs span 0–V+. The device retains full 256-tap resolution and nonvolatile storage functionality.

What is the wiper resistance specification for the X9258US24IZT2 at ±5V analog supplies?

At V+ = +5V and V− = −5V, the X9258US24IZT2 specifies typical wiper resistance (RW) of 40 Ω, with a maximum of 100 Ω. This low on-resistance minimizes signal path error in precision divider configurations and ensures predictable loading effects when driving high-impedance nodes such as op-amp inputs or ADC references. Wiper resistance increases at lower supply voltages.