Renesas ISL22449UFV14Z

Overview

ISL22449UFV14Z from Renesas Electronics (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) with SPI interface, 128-tap resolution, non-volatile wiper position storage, and 50kΩ end-to-end resistance. It operates from 2.7V to 5.5V, features 70Ω typical wiper resistance, shutdown mode (6.5µA max), and is rated for -40°C to +125°C. It serves as a precision voltage divider in programmable gain amplifiers and sensor calibration circuits.

For engineers reviewing the ISL22449UFV14Z datasheet, ISL22449UFV14Z pinout, ISL22449UFV14Z application, or ISL22449UFV14Z equivalent, key selection considerations include SPI-compatible digital control of four independent potentiometers, non-volatile initial value recall at power-up, low-noise analog performance (±1 LSB INL), and TSSOP-14 packaging for space-constrained industrial signal conditioning designs.

Technical Context

The ISL22449UFV14Z implements four independent DCPs using resistor arrays and CMOS switches in "make-before-break" switching mode. Each DCP has a volatile Wiper Register (WR) and a non-volatile Initial Value Register (IVR); power-up loads IVR contents into WR. The SPI interface operates in Mode 0 (CPOL=0, CPHA=0), with data clocked in on SCK rising edge and out on falling edge.

Shutdown is activated either via the active-low SHDN pin or the SHDN bit in the Access Control Register (ACR), placing all RW terminals at GND and opening RH–RL paths. During shutdown, SPI remains accessible, and registers retain full read/write capability - enabling dynamic configuration without power cycle interruption.

Key Specifications

Pinout & Package

ISL22449UFV14Z is housed in a 14-lead Pb-free (RoHS-compliant) TSSOP package (M14.173 drawing), with 0.65mm pitch, 4.95–5.05mm width, and 6.25–6.50mm length. Thermal resistance θ_JA is 100°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22449UFV14Z, ISL22446WFV14Z offers lower resistance for current-driven applications but identical digital control and non-volatility, while AD5242BRUZ10 trades SPI simplicity for I²C compatibility and finer resolution at the cost of integrated shutdown functionality and register-level consistency.

Availability

ISL22449UFV14Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifiers, audio channel balancing, and PLC analog output scaling requiring stable component supply across extended temperature ranges.

Supply support for ISL22449UFV14Z 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 trusted embedded solutions, with heritage from Intersil's precision analog product line.

The ISL22449UFV14Z belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in high-reliability industrial, automotive, and instrumentation systems where programmability, non-volatility, and temperature stability are critical.

FAQ

What is the end-to-end resistance value specified for ISL22449UFV14Z?

The ISL22449UFV14Z is factory-configured with a 50kΩ end-to-end resistance (RTOTAL), as indicated by the "U" in the part number per the Ordering Information table. This value has a tolerance of ±20% over temperature and is optimized for voltage divider applications requiring moderate impedance levels and low thermal drift (±80ppm/°C).

Does ISL22449UFV14Z support true non-volatile storage of wiper positions?

Yes, ISL22449UFV14Z includes non-volatile Initial Value Registers (IVRs) that retain wiper settings for up to 50 years at temperatures below +55°C. At power-up, the device automatically recalls IVR contents into the corresponding volatile Wiper Registers (WRs), ensuring repeatable startup behavior without host intervention.

How does the shutdown mode affect the wiper terminals of ISL22449UFV14Z?

In shutdown mode - activated by pulling SHDN low or setting the SHDN bit in the ACR register - ISL22449UFV14Z shorts all RW0–RW3 terminals to GND and opens the RH–RL paths of all four DCPs. This prevents signal leakage while maintaining register accessibility via SPI, allowing reconfiguration before exit from shutdown.

Can ISL22449UFV14Z be used with a 3.3V microcontroller SPI interface?

Yes, ISL22449UFV14Z operates across 2.7V to 5.5V and is fully compatible with 3.3V SPI hosts. Its input thresholds (VIH = 0.7×VCC, VIL = 0.3×VCC) and 5MHz max SCK frequency ensure robust communication. SDO requires an external pull-up resistor (≤2kΩ recommended for 5MHz operation).

What is the maximum wiper current rating for ISL22449UFV14Z?

The absolute maximum wiper current for ISL22449UFV14Z is ±3mA, as specified under Recommended Operating Conditions. Exceeding this may cause irreversible resistance drift or wiper contact degradation. Power dissipation per DCP must remain ≤5mW, limiting continuous current based on applied voltage and tap position.