Renesas ISL22444TFR20Z

Overview

ISL22444TFR20Z from Renesas Electronics (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) IC with 256-tap resolution, SPI interface, non-volatile wiper storage, and dual-supply operation (VCC = 2.25–5.5 V, V− = −2.25 to −5.5 V). It integrates four independent DCPs, 11 general-purpose non-volatile registers, and shutdown mode - used for precision gain/offset trimming in bipolar signal conditioning circuits.

For engineers reviewing the ISL22444TFR20Z datasheet, ISL22444TFR20Z pinout, ISL22444TFR20Z application, or ISL22444TFR20Z equivalent, this page delivers verified specifications, QFN-20 package details, real-world use cases in industrial sensor interfaces and programmable bias networks, and validated alternative parts with documented functional differences.

Technical Context

The ISL22444TFR20Z implements four monolithic CMOS DCPs using resistor ladders and "make-before-break" CMOS switches, each with an 8-bit volatile Wiper Register (WRi) and non-volatile Initial Value Register (IVRi). At power-up, IVRi contents are automatically loaded into WRi, enabling deterministic startup behavior.

It supports SPI Mode 0 (CPOL = 0, CPHA = 0), daisy-chain configuration, and dual-rail operation enabling true bipolar voltage divider or rheostat use across V− to VCC. Shutdown mode forces open-circuit end-to-end resistance and shorts RWi to RLi per channel.

Key Specifications

Pinout & Package

ISL22444TFR20Z is housed in a 20-lead QFN package (5 mm × 5 mm, L20.5x5), with exposed die pad internally connected to V−. Thermal land for the EPAD must be connected to V− plane or left floating per TB389.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22444TFR20Z, ISL22424TFR20Z trades resolution and memory for lower cost, while AD5242BRUZ100 substitutes I²C for SPI and sacrifices bipolar capability - making ISL22444TFR20Z uniquely suited for high-precision, dual-rail, field-calibratable analog systems.

Availability

ISL22444TFR20Z is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable bias networks, medical instrumentation calibration, and automotive battery management systems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ISL22444TFR20Z 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 its precision analog portfolio, emphasizing high-reliability, extended-temperature ICs for industrial and automotive markets.

The ISL22444TFR20Z belongs to the XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in automated calibration, sensor compensation, and programmable analog signal chains.

FAQ

What is the package type and footprint of ISL22444TFR20Z?

ISL22444TFR20Z uses a 20-lead QFN package (5 mm × 5 mm, L20.5x5) with an exposed die pad internally tied to V−. The footprint matches JEDEC MO-220WEED, and PCB thermal land for the EPAD must connect to the V− plane or remain floating per Intersil TB389 guidelines.

Does ISL22444TFR20Z support true bipolar operation?

Yes. ISL22444TFR20Z supports dual supplies: VCC = 2.25–5.5 V and V− = −2.25 to −5.5 V. This allows DCP terminals (RH, RL, RW) to operate across the full V− to VCC range - enabling genuine bipolar voltage division and rheostat use without level shifters.

How does non-volatile memory work in ISL22444TFR20Z?

ISL22444TFR20Z contains four non-volatile Initial Value Registers (IVRi) that store power-up wiper positions. At power-on, IVRi contents are automatically loaded into volatile Wiper Registers (WRi). IVRi endurance is 1,000,000 cycles with 50-year data retention at ≤+55°C.

Can ISL22444TFR20Z be daisy-chained via SPI?

Yes. ISL22444TFR20Z supports daisy-chain configuration: SDO of one device connects to SDI of the next, sharing SCK and CS lines. This allows control of multiple ISL22444TFR20Z units with a single SPI master and no additional chip-select signals.

What is the maximum SPI clock frequency supported by ISL22444TFR20Z?

ISL22444TFR20Z supports SPI clock frequencies up to 5 MHz. Timing parameters including tCYC (200 ns), tWH/tWL (100 ns min), and setup/hold times (50 ns) are fully characterized at this rate under recommended operating conditions.