Renesas ISL22449WFV14Z

Overview

ISL22449WFV14Z from Renesas (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) with SPI interface, 128-tap resolution, non-volatile wiper storage, and 10kΩ end-to-end resistance. It operates from 2.7V to 5.5V, delivers 70Ω typical wiper resistance, and supports shutdown mode with ≤6.5µA current at +125°C. It replaces mechanical pots in precision voltage divider applications such as sensor calibration and power supply feedback.

For engineers reviewing the ISL22449WFV14Z datasheet, ISL22449WFV14Z pinout, ISL22449WFV14Z application, or ISL22449WFV14Z equivalent, key selection criteria include SPI-compatible quad-channel digital trimming, 10kΩ resistance option with ±20% tolerance, TSSOP-14 package compatibility, and guaranteed operation from –40°C to +125°C.

Technical Context

The ISL22449WFV14Z integrates four independent DCPs sharing a single SPI bus (Mode 0), each with dedicated volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR). Wiper position is updated within 1.5µs after SPI write, and power-on recall loads IVR values into WR registers using a 2.0–2.6V Vpor threshold.

Shutdown is controlled either via active-low SHDN pin or ACR register bit, placing all RW terminals at GND while maintaining open-circuit end-to-end resistance. The device uses "make-before-break" switching and supports up to 1M EEPROM write cycles with 50-year data retention below +55°C.

Key Specifications

Pinout & Package

ISL22449WFV14Z is housed in a 14-lead Pb-free TSSOP (M14.173) package, 4.95–5.05mm × 4.30–4.50mm footprint, 1.05mm max height, with 0.65mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22446WFV14Z, ISL22449WFV14Z adds non-volatile wiper retention for true power-loss immunity; compared with AD5242BRUZ10, it offers SPI interface, hardware shutdown, and double the channel count in same footprint-critical for compact, self-contained analog trimming.

Availability

ISL22449WFV14Z is available at Aetrix Electronics and suitable for LED driver trimming, sensor signal conditioning, programmable power supply feedback, and audio channel balance control requiring stable component supply across automotive, industrial, and test equipment lifecycles.

Supply support for ISL22449WFV14Z 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 (formerly Intersil) is a global semiconductor leader specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and computing markets.

The ISL22449 product line delivers digitally programmable analog front-end components optimized for precision trimming, calibration, and adaptive biasing in harsh-environment systems.

FAQ

What is the resistance tolerance and temperature coefficient of the ISL22449WFV14Z?

The ISL22449WFV14Z has a total end-to-end resistance of 10kΩ with ±20% tolerance and a temperature coefficient of ±50ppm/°C. These values are specified for the "W" resistance option and ensure predictable voltage division behavior across the full –40°C to +125°C operating range. The ISL22449WFV14Z maintains this stability without requiring external compensation circuits.

How does the ISL22449WFV14Z handle power-up wiper initialization?

At power-up, the ISL22449WFV14Z recalls stored values from its non-volatile Initial Value Registers (IVRs) into the corresponding volatile Wiper Registers (WRs), setting each wiper to its last-saved position. This recall occurs once VCC exceeds 2.0–2.6V (Vpor) and completes within 3ms. If IVRs are unprogrammed, WRs default to 40h (mid-scale). The ISL22449WFV14Z thus eliminates host-initiated calibration on every boot.

Can the ISL22449WFV14Z operate in shutdown mode while retaining SPI accessibility?

Yes-the ISL22449WFV14Z supports full SPI register access (read/write to WRs, IVRs, and ACR) even when in shutdown mode, whether activated by pulling SHDN pin low or setting the SHDN bit in the ACR. During shutdown, all RW terminals are shorted to GND and DCP end-to-end resistance becomes open-circuit, but the SPI interface remains fully functional. This allows host systems to reconfigure wiper positions or update IVRs without exiting shutdown.

What is the maximum SPI clock frequency supported by the ISL22449WFV14Z?

The ISL22449WFV14Z supports SPI clock frequencies up to 5MHz, with minimum cycle time of 200ns, setup/hold times of 50ns, and valid data window of 350ns after SCK falling edge. This timing allows reliable communication with modern microcontrollers and FPGAs without added wait states. The ISL22449WFV14Z uses SPI Mode 0 (CPOL=0, CPHA=0), with data sampled on rising SCK edge for SDI and output on falling edge for SDO.

Does the ISL22449WFV14Z require an external pull-up resistor on the SDO pin?

Yes-the ISL22449WFV14Z features an open-drain SDO output that requires an external pull-up resistor for proper logic-level signaling. The datasheet specifies a maximum value of 2kΩ when operating at 5MHz with 30pF bus capacitance. Using a higher-value resistor is acceptable at lower SPI speeds but may degrade rise/fall times. The ISL22449WFV14Z's SDO pin cannot drive logic-high without this external component.