Renesas ISL22444UFV20Z

Overview

ISL22444UFV20Z from Renesas Electronics (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) with 256-tap resolution, SPI interface, non-volatile wiper storage, and dual-supply operation (VCC = 2.25–5.5V, V− = −2.25 to −5.5V). It integrates four independent 50kΩ DCPs in a 20-lead TSSOP package and supports voltage divider or rheostat configurations for precision analog control in industrial signal conditioning circuits.

For engineers reviewing the ISL22444UFV20Z datasheet, ISL22444UFV20Z pinout, ISL22444UFV20Z application, or ISL22444UFV20Z equivalent, key selection considerations include its 50kΩ end-to-end resistance, ±45 ppm/°C end-to-end tempco, shutdown mode (<4µA), 70Ω typical wiper resistance, and compatibility with bipolar terminal voltages spanning V− to VCC.

Technical Context

The ISL22444UFV20Z implements four independent resistor arrays using CMOS-switched ladder networks, each controlled by an 8-bit volatile Wiper Register (WRi) and backed by a non-volatile Initial Value Register (IVRi). At power-up, IVRi contents are automatically loaded into WRi, ensuring repeatable startup positions without host intervention.

Its SPI interface operates in Mode 0 (CPOL=0, CPHA=0), supporting daisy-chain configuration and full read/write access to WRi, IVRi, and 11 general-purpose non-volatile registers. The device features make-before-break switching, shutdown mode (RWi shorted to RLi, DCP open-circuited), and dual supply rails enabling true bipolar analog signal routing.

Key Specifications

Pinout & Package

ISL22444UFV20Z is housed in a 20-lead TSSOP (M20.173) package with exposed pad connected to V−. Pin functions are electrically identical to the QFN variant but mapped to different physical locations per datasheet Page 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22444UFV20Z, ISL22424WFV20Z reduces channel count and removes bipolar capability, while AD5242BRUZ50 trades SPI for I²C and sacrifices shutdown mode and GP register storage - making ISL22444UFV20Z uniquely suited for multi-channel, bipolar, low-power industrial control.

Availability

ISL22444UFV20Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifiers, bipolar signal conditioning, and embedded power trim applications requiring stable component supply across extended temperature ranges.

Supply support for ISL22444UFV20Z 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 legacy product support, quality assurance, and documentation for precision analog ICs including the XDCP™ family.

The ISL22444UFV20Z belongs to Renesas' digitally controlled potentiometer product line, designed specifically for replacing mechanical trimmers in high-reliability industrial, automotive, and medical systems requiring non-volatile setting retention and wide-temperature operation.

FAQ

What is the total resistance value of the ISL22444UFV20Z?

The ISL22444UFV20Z has a nominal end-to-end resistance of 50kΩ per digitally controlled potentiometer channel. This value is fixed and specified in the Ordering Information table of the FN6426 datasheet under the "U" resistance option. It applies across all four DCPs and remains stable within ±20% tolerance over temperature and voltage conditions.

Does the ISL22444UFV20Z support bipolar analog signal routing?

Yes, the ISL22444UFV20Z supports true bipolar operation via separate VCC (2.25–5.5V) and V− (−2.25 to −5.5V) supply pins. This allows DCP terminals (RH, RL, RW) to swing between V− and VCC, enabling direct interfacing with ±2.5V or ±5V signal domains without external level shifters - a capability confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions sections.

How does the non-volatile memory function in the ISL22444UFV20Z?

The ISL22444UFV20Z includes four non-volatile Initial Value Registers (IVRi), one per DCP, which store wiper positions written via SPI. At power-up, each IVRi value is automatically loaded into its corresponding volatile Wiper Register (WRi). This ensures repeatable startup behavior without host intervention. IVRi endurance is rated at 1,000,000 cycles with 50-year data retention at ≤+55°C.

Can multiple ISL22444UFV20Z devices be connected on a single SPI bus?

Yes, the ISL22444UFV20Z supports daisy-chain configuration using its SPI interface. In this mode, the SDO of one device connects to the SDI of the next, allowing sequential communication with multiple units using a single CS line. The datasheet confirms this capability in the "Daisy Chain Configuration" section on Page 14 and specifies timing compatibility across chained devices.

What is the wiper resistance specification for the ISL22444UFV20Z?

The ISL22444UFV20Z has a typical wiper resistance of 70Ω at 1mA, with a maximum of 250Ω across temperature and voltage ranges. This parameter is measured with RH floating and RLi tied to V−, and directly impacts insertion loss and signal fidelity in voltage divider or rheostat configurations - especially critical in high-impedance feedback networks.