Renesas ISL22446UFV20Z

Overview

ISL22446UFV20Z from Renesas Electronics (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) with 128-tap resolution, SPI™ interface, non-volatile wiper storage, and 50kΩ end-to-end resistance. It operates from 2.7V to 5.5V, supports -40°C to +125°C, and delivers low-noise, low-power analog adjustment in precision voltage divider or rheostat configurations. Used in programmable gain amplifiers, sensor calibration circuits, and DC-DC feedback loop tuning.

For engineers reviewing the ISL22446UFV20Z datasheet, ISL22446UFV20Z pinout, ISL22446UFV20Z application, or ISL22446UFV20Z equivalent, key selection criteria include its 20-lead TSSOP package, 70Ω typical wiper resistance at 3.3V, ±50ppm/°C end-to-end tempco (U option), shutdown current ≤5µA, and monotonic 12-bit-equivalent linearity (±1 LSB INL/DNL).

Technical Context

The ISL22446UFV20Z integrates four independent DCPs on a monolithic CMOS die, each with volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR). Wiper position is set via SPI mode-0 interface (SCK up to 5MHz), with data clocked in on rising edge and out on falling edge. Each WR controls a 7-bit wiper address (0–127), enabling precise resistor tap selection across RH–RL terminals.

Power-up behavior loads IVR contents into corresponding WR registers; shutdown mode (via SHDN pin or ACR bit) opens RH–RL and shorts RW to RL while preserving register state. Non-volatile writes require up to 20ms and are subject to 1M-cycle endurance and 50-year data retention below +55°C.

Key Specifications

Pinout & Package

ISL22446UFV20Z is housed in a 20-lead TSSOP (Pb-free, RoHS-compliant) package with exposed thermal pad internally connected to GND. Pin functions are electrically identical to the TQFN variant but mapped to TSSOP physical layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22446UFV20Z, ISL22424 reduces channel count and removes shutdown capability but offers higher resolution (256 taps); AD5242BRUZ10 trades SPI for I²C, halves channel count, and sacrifices non-volatility and tempco performance-making ISL22446UFV20Z optimal for quad-channel, low-drift, self-contained industrial calibration.

Availability

ISL22446UFV20Z is available at Aetrix Electronics and suitable for programmable gain amplifiers, sensor calibration circuits, DC-DC feedback dividers, and LED brightness control requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ISL22446UFV20Z 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 Corporation is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for industrial, automotive, and infrastructure markets.

The ISL22446UFV20Z belongs to Renesas' XDCP™ family of digitally controlled potentiometers, engineered for high-reliability analog trimming in harsh environments where mechanical potentiometers fail due to wear, vibration, or contamination.

FAQ

What is the total resistance value of the ISL22446UFV20Z?

The ISL22446UFV20Z has a nominal total resistance of 50kΩ between RH and RL terminals. This value is specified in the Ordering Information table of the FN6181 datasheet and confirmed in Analog Specifications (RTOTAL = 50 kΩ for U-option devices). The resistance tolerance is ±20%, and end-to-end temperature coefficient is ±80ppm/°C over -40°C to +125°C.

Does the ISL22446UFV20Z support non-volatile storage of wiper positions?

Yes, the ISL22446UFV20Z includes non-volatile Initial Value Registers (IVRs) for each of its four DCPs. At power-up, the device automatically recalls IVR contents into corresponding volatile Wiper Registers (WRs). IVRs support 1,000,000 write cycles and guarantee 50 years of data retention at temperatures below +55°C, as verified in the EEPROM Specification section of FN6181.

What package type is used for the ISL22446UFV20Z?

The ISL22446UFV20Z uses a 20-lead TSSOP (Thin Shrink Small Outline Package) with Pb-free (RoHS-compliant) finish and internal GND-connected EPAD. Its mechanical drawing is designated M20.173, and it is distinct from the TQFN variant (L20.4x4A) despite functional pin equivalence. Thermal resistance θJA is 95°C/W under standard test conditions.

How does shutdown mode affect the ISL22446UFV20Z's DCP terminals?

In shutdown mode (activated by pulling SHDN pin low or setting ACR[6]=0), the ISL22446UFV20Z opens the RH–RL path and shorts each RW terminal to its corresponding RL terminal. This places all four DCPs in a known, low-impedance state while preserving wiper register contents. SPI communication remains fully accessible, allowing register reads/writes even during shutdown.

Can the ISL22446UFV20Z be used in both voltage divider and rheostat configurations?

Yes, the ISL22446UFV20Z supports both configurations. In voltage divider mode, RH is connected to VCC or reference voltage, RL to GND, and RW provides adjustable output. In rheostat mode, either RH or RL is left unconnected while RW and the other terminal form a two-terminal variable resistor. Datasheet sections "DCP Description" and "Analog Specifications" confirm monotonic performance in both modes with specified INL/DNL and matching metrics.