Renesas ISL22424UFV14Z

Overview

ISL22424UFV14Z from Renesas (formerly Intersil) is a dual digitally controlled potentiometer (XDCP™) with 256-tap resolution, SPI interface, non-volatile wiper position storage, and 50kΩ end-to-end resistance. It operates from dual supplies (VCC = 2.25–5.5V, V− = −2.25 to −5.5V), supports voltage divider and rheostat modes, and targets precision analog trimming in industrial signal conditioning circuits.

For engineers reviewing the ISL22424UFV14Z datasheet, ISL22424UFV14Z pinout, ISL22424UFV14Z application, or ISL22424UFV14Z equivalent, key selection criteria include bipolar supply capability, ±45 ppm/°C end-to-end tempco, 70Ω typical wiper resistance, shutdown mode (<4µA), and 14-lead TSSOP package compatibility with high-reliability industrial temperature range (−40°C to +125°C).

Technical Context

The ISL22424UFV14Z integrates two independent DCPs sharing one SPI bus, each with volatile Wiper Register (WRi) and non-volatile Initial Value Register (IVRi). Wiper positioning uses make-before-break CMOS switches across 256 resistor elements, ensuring monotonicity and glitch-free transitions. Power-up recalls IVRi contents into WRi automatically.

It implements SPI Mode 0 (CPOL = 0, CPHA = 0) with daisy-chain support, push-pull or open-drain SDO configurable via ACR[1], and shutdown control (ACR[6]) that forces RWi to RLi while opening RH–RL path. The 13 general-purpose non-volatile registers enable lookup-table storage for multi-point calibration.

Key Specifications

Pinout & Package

ISL22424UFV14Z is housed in a 14-lead TSSOP (M14.173) with exposed pad not connected internally. Pin 7 is NC; pins 1–6 and 8–14 are functional as listed below.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22424UFV14Z, ISL22424WFR16Z-TK offers higher bandwidth but requires QFN rework, while AD5242BRUZ50 sacrifices bipolar capability and shutdown for I²C simplicity-making ISL22424UFV14Z uniquely suited for rugged, dual-rail industrial trimming.

Availability

ISL22424UFV14Z is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, programmable gain amplifier calibration, and bipolar op-amp offset nulling requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ISL22424UFV14Z 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 legacy Intersil precision analog products.

The ISL22424 series was designed specifically for high-reliability industrial and automotive analog trimming-emphasizing non-volatile memory endurance (1M cycles), 50-year data retention, and operation across −40°C to +125°C.

FAQ

What is the maximum SPI clock frequency supported by the ISL22424UFV14Z?

The ISL22424UFV14Z supports SPI clock frequencies up to 5 MHz, as specified in the datasheet's Serial Interface Specifications table. This allows fast register access and wiper updates-critical for real-time calibration loops. Operation above 5 MHz is not guaranteed and may cause communication errors or incomplete writes. The device uses SPI Mode 0 (CPOL = 0, CPHA = 0), with data sampled on the rising edge of SCK and output on the falling edge.

Does the ISL22424UFV14Z retain its wiper position after power cycling?

Yes, the ISL22424UFV14Z retains its wiper position after power cycling via its non-volatile Initial Value Registers (IVR0 and IVR1). At power-up, the device automatically recalls the stored IVR values into the volatile Wiper Registers (WR0 and WR1), restoring the last calibrated position. This behavior is confirmed in the datasheet's "Principles of Operation" section and requires no host intervention-making ISL22424UFV14Z ideal for set-and-forget industrial calibration.

Can the ISL22424UFV14Z operate with only a single positive supply?

No-the ISL22424UFV14Z requires dual supplies: VCC (2.25–5.5V) and V− (−2.25 to −5.5V). Its architecture relies on bipolar voltage rails to enable true symmetric operation of both DCPs, especially in voltage divider mode where RH and RL terminals span the full V− to VCC range. Attempting single-supply operation violates Absolute Maximum Ratings and will result in improper wiper behavior or device damage.

What is the wiper resistance specification for the ISL22424UFV14Z and why does it matter?

The ISL22424UFV14Z has a typical wiper resistance of 70Ω at 1mA, with a maximum of 250Ω. This parameter directly impacts insertion loss and signal integrity in precision analog paths-especially in low-impedance feedback networks or current-sensing applications. A low wiper resistance minimizes gain error and thermal noise contribution, enabling accurate trimming in op-amp circuits where even small resistive offsets degrade performance.

How does the shutdown mode function in the ISL22424UFV14Z?

In shutdown mode (enabled by setting ACR[6] = 0), the ISL22424UFV14Z opens the RH–RL path for both DCPs while shorting each RW terminal to its respective RL terminal. This prevents floating nodes and eliminates current flow through the resistor array. Shutdown current remains below 4µA, making it suitable for battery-backed systems. Wiper position is preserved in IVRi and restored upon exit from shutdown-ensuring deterministic reactivation.