Renesas ISL90842UIV1427Z

Overview

ISL90842UIV1427Z from Intersil is a quad digitally controlled potentiometer (DCP) IC configured as four independent 2-terminal variable resistors, each with 256 taps, 50kΩ end-to-end resistance, I²C interface, and 70Ω typical wiper resistance at 3.3V - used for precision analog parameter tuning in power supply feedback loops, sensor calibration, and audio gain control.

For engineers reviewing the ISL90842UIV1427Z datasheet, ISL90842UIV1427Z pinout, ISL90842UIV1427Z application, or ISL90842UIV1427Z equivalent, key selection criteria include I²C address configuration (A0/A1), volatile wiper register behavior, 2.7V–5.5V supply range, -40°C to +85°C operation, and TSSOP-14 package compatibility with high-density PCB layouts.

Technical Context

The ISL90842UIV1427Z implements four independent DCPs using resistor ladders and CMOS switches, each controlled by an 8-bit volatile Wiper Register (WR) accessible via standard I²C protocol at up to 400kHz clock rate. All WRs reset to 0x80 on power-up, positioning wipers at mid-scale (≈25kΩ).

It operates as an I²C slave device with fixed 5-bit ID prefix (01010) and user-configurable 2-bit address (A1/A0), supporting four unique device addresses (00h–03h) for WR0–WR3 access. RL terminals are unconnected; only RH and RW pins are functional per DCP.

Key Specifications

Pinout & Package

ISL90842UIV1427Z uses a 14-lead Pb-free TSSOP (Package Code V14) with 0.65mm lead pitch and 1.0mm max height. Pin 1 is RH3; pin 14 is RW0. All RL terminals are internally unconnected and must remain floating per datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP45HV51-503, the ISL90842UIV1427Z offers superior wiper resistance (70Ω vs ≥120Ω), guaranteed monotonicity (DNL ≤ ±0.5 LSB), and automatic mid-scale power-up initialization - making it optimal for precision analog trimming where repeatability and low insertion error are critical.

Availability

ISL90842UIV1427Z is available at Aetrix Electronics and suitable for industrial power supplies, sensor calibration modules, audio equipment, and programmable analog front-ends requiring stable component supply and long-term obsolescence management.

Supply support for ISL90842UIV1427Z 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

Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and mixed-signal semiconductor company specializing in power management, precision analog, and interface solutions.

The ISL90842UIV1427Z belongs to Intersil's digitally controlled potentiometer product line, designed specifically for replacing mechanical trimmers in automated, software-configurable analog systems requiring high reliability and repeatable calibration.

FAQ

What is the default wiper position of the ISL90842UIV1427Z after power-up?

Upon power-up, all four wiper registers (WR0–WR3) in the ISL90842UIV1427Z reset to 0x80 (128 decimal), positioning each wiper at approximately mid-scale - resulting in ~25kΩ resistance between RH and RW terminals. This behavior ensures predictable startup conditions in feedback and calibration circuits without requiring host initialization.

Does the ISL90842UIV1427Z support nonvolatile wiper storage?

No, the ISL90842UIV1427Z uses volatile wiper registers only. Wiper positions are lost when VCC is removed and must be reloaded by the host controller via I²C after each power cycle. For persistent settings, the host MCU must store tap values in its own nonvolatile memory and rewrite them at boot.

Can multiple ISL90842UIV1427Z devices share the same I²C bus?

Yes - the ISL90842UIV1427Z supports up to four devices on one I²C bus using hardware-selectable addresses via A0 and A1 pins. Each combination (00, 01, 10, 11) maps to a unique 2-bit address (00h–03h), enabling individual access to WR0–WR3 registers without bus contention.

What is the maximum allowable voltage across RH–RW terminals of the ISL90842UIV1427Z?

The absolute maximum voltage across any RH–RW pair is limited to VCC (with GND referenced), per datasheet Absolute Maximum Ratings. Operating beyond this risks latch-up or permanent damage. For 5.5V VCC, RH–RW differential must stay within 0V to 5.5V; exceeding this violates safe operating area even if within ±6mA wiper current limit.

Is the RL terminal used or connected in the ISL90842UIV1427Z?

No - the RL terminals of all four DCPs in the ISL90842UIV1427Z are internally unconnected and must remain floating in the circuit. Only RH and RW pins are functional; connecting RL to any potential violates the specified operating configuration and may cause unpredictable behavior or damage.