Renesas ISL22426UFV14Z

Overview

ISL22426UFV14Z from Renesas (formerly Intersil) is a dual digitally controlled potentiometer (XDCP™) with non-volatile wiper storage, 128-tap resolution, SPI interface, and 50kΩ end-to-end resistance in a 14-lead TSSOP package. It operates from 2.7V to 5.5V, supports voltage divider and rheostat modes, and delivers ±0.5 LSB DNL for precision analog control in programmable gain stages.

For engineers reviewing the ISL22426UFV14Z datasheet, ISL22426UFV14Z pinout, ISL22426UFV14Z application, or ISL22426UFV14Z equivalent, key selection criteria include shutdown current (≤5 µA), wiper resistance (70 Ω typ. at 3.3V), ratiometric temperature coefficient (±4 ppm/°C), and guaranteed monotonicity across full tap range.

Technical Context

The ISL22426UFV14Z integrates two independent CMOS-switched resistor arrays, each with volatile Wiper Registers (WR) and non-volatile Initial Value Registers (IVR). Power-up automatically loads IVR contents into WR, enabling repeatable startup states without host intervention.

Its SPI interface complies with Mode 0 (CPOL=0, CPHA=0), uses rising-edge data input (SDI) and falling-edge output (SDO), and supports both volatile register access (WR only) and non-volatile writes (IVR + WR) via the Access Control Register (ACR). Shutdown mode disconnects RH terminals and shorts RW to RL while preserving register accessibility.

Key Specifications

Pinout & Package

ISL22426UFV14Z is housed in a 14-lead TSSOP (Pb-free, RoHS-compliant) with 0.65 mm pitch. The package includes two NC pins and exposes no thermal pad. Pin 1 is VCC; pin 9 is GND; pin 2 is active-low SHDN; pins 3–5 and 10–12 serve as DCP0/DCP1 RH/RL/RW terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22426UFV14Z, ISL22424WFV14Z offers lower resistance for higher wiper current capability, while MCP42050-I/P reduces component count at the expense of dual-channel flexibility and robustness features like hardware shutdown and monotonicity guarantee.

Availability

ISL22426UFV14Z is available at Aetrix Electronics and suitable for programmable gain amplifiers, DC bias adjustment circuits, LED current control systems, and audio channel balancing requiring stable component supply across automotive (-40°C to +125°C), industrial, and medical instrumentation applications.

Supply support for ISL22426UFV14Z 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 acquired Intersil in 2017 and maintains full technical and manufacturing continuity for the ISL22426 family. Renesas is a global semiconductor leader specializing in microcontrollers, analog, and power management ICs.

The ISL22426 series was designed for high-reliability analog tuning in harsh environments, targeting automotive infotainment, industrial PLCs, and medical diagnostics equipment requiring extended temperature operation and non-volatile configuration retention.

FAQ

What is the default wiper position of ISL22426UFV14Z at power-up?

At initial power-on before non-volatile recall completes, all wiper registers reset to 0x40 (64 decimal), placing each wiper near the midpoint of its 50 kΩ resistor ladder. Once VCC exceeds 2.0 V and recall completes (~3 ms), ISL22426UFV14Z loads the stored IVR values into the corresponding WR registers, restoring the last-saved positions.

Can ISL22426UFV14Z operate in rheostat mode, and how is it configured?

Yes, ISL22426UFV14Z supports rheostat mode by connecting either RH or RL to the signal path and using RW as the variable terminal. For example, to set a programmable current-limit resistor, connect RL to ground and RW to the current-sense amplifier input-leaving RH unconnected. This configuration achieves 0–50 kΩ resistance with 70 Ω wiper resistance.

Does ISL22426UFV14Z require an external pull-up resistor on the SDO pin?

Yes, ISL22426UFV14Z features an open-drain SDO output that requires an external pull-up resistor. The datasheet specifies a maximum value of 2 kΩ for 5 MHz SPI operation with 30 pF bus capacitance. Lower values (e.g., 1 kΩ) improve rise time but increase static current; ISL22426UFV14Z remains fully functional across 1–10 kΩ depending on speed and noise requirements.

How does the shutdown mode affect the wiper position and register accessibility of ISL22426UFV14Z?

In shutdown mode (SHDN = LOW or ACR[6] = 0), ISL22426UFV14Z opens the RH connections and shorts RW to RL, effectively disabling the potentiometer function. However, the SPI interface remains fully operational: all registers-including WR, IVR, and ACR-can be read or written, and the wiper position is preserved for immediate restoration upon exit.

What is the maximum SPI clock frequency supported by ISL22426UFV14Z?

ISL22426UFV14Z supports SPI clock frequencies up to 5 MHz under recommended operating conditions. Timing parameters-including tCYC (200 ns), tWH/tWL (100 ns), and tSU/tH (50 ns)-are fully characterized at this rate. Operation above 5 MHz is not guaranteed and may result in setup/hold violations or incorrect register reads/writes.