Renesas ISL90842WIV1427Z-TK

Overview

ISL90842WIV1427Z-TK from Intersil is a quad digitally controlled variable resistor (DCP) IC configured as four independent 10kΩ two-terminal rheostats, featuring 256-tap I²C control, 70Ω typical wiper resistance at 3.3V, <5µA standby current, and operation from 2.7V to 5.5V - used for precision analog trimming in sensor signal conditioning circuits.

For engineers reviewing the ISL90842WIV1427Z-TK datasheet, ISL90842WIV1427Z-TK pinout, ISL90842WIV1427Z-TK application, or ISL90842WIV1427Z-TK equivalent, key selection criteria include I²C address configuration (A0/A1), wiper resistance impact on gain error, DCP matching tolerance (±2 MI), and TSSOP-14 thermal performance in space-constrained industrial modules.

Technical Context

The ISL90842WIV1427Z-TK implements four monolithic CMOS DCPs with volatile 8-bit wiper registers (WR0–WR3), each directly addressable via I²C using dedicated identification byte (01010A1A0R/W) and address bytes (00h–03h). Wiper position is monotonic across all 256 taps, with RH-to-RW resistance ranging from 0Ω to 10kΩ.

It operates as an I²C slave only, supporting standard-mode (400kHz) timing with tLOW ≥1300ns, tHIGH ≥600ns, and SDA/SCL input hysteresis of 0.05×VCC. RL terminals are unconnected; only RH and RW pins are functional per DCP, enabling true two-terminal rheostat use without external grounding.

Key Specifications

Pinout & Package

ISL90842WIV1427Z-TK uses a 14-lead Pb-free TSSOP package (Package Code V14), 4.4mm × 5.0mm footprint, 0.65mm pitch, with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP4017T-103E/OT, the ISL90842WIV1427Z-TK delivers superior channel matching (±2 MI), lower wiper resistance (70Ω), and compact quad integration in 14-pin TSSOP - making it optimal for multi-channel precision analog systems requiring coordinated calibration.

Availability

ISL90842WIV1427Z-TK is available at Aetrix Electronics and suitable for industrial sensor conditioning, medical instrumentation, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ISL90842WIV1427Z-TK 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) designs high-performance analog and mixed-signal ICs for industrial, computing, and communications markets, with ISO 9001-certified manufacturing.

The ISL90842 product line targets digitally programmable analog front-ends, delivering integrated, low-noise, low-power DCP solutions for factory-calibrated and field-adjustable precision systems.

FAQ

What is the power-up default wiper position for each DCP in the ISL90842WIV1427Z-TK?

At power-up, all four wiper registers (WR0–WR3) in the ISL90842WIV1427Z-TK reset to 80h (128 decimal), positioning each wiper at approximately 50% of total resistance - yielding ~5kΩ between RH and RW for the 10kΩ variant. This mid-scale initialization ensures predictable startup behavior in gain-setting and biasing applications without requiring immediate host intervention.

Does the ISL90842WIV1427Z-TK support write-protection or non-volatile storage of wiper settings?

No, the ISL90842WIV1427Z-TK contains only volatile wiper registers with no EEPROM or non-volatile memory. Wiper positions are lost upon power removal and must be reloaded by the host controller at startup. This design prioritizes speed, reliability, and absence of write-cycle limitations - making ISL90842WIV1427Z-TK ideal for applications requiring frequent dynamic adjustment rather than persistent storage.

Can the ISL90842WIV1427Z-TK be used as a three-terminal potentiometer?

No - the ISL90842WIV1427Z-TK is designed exclusively as a two-terminal variable resistor (rheostat). Its RL terminals are left floating per datasheet specification, and no internal connection exists between RL and GND or any other node. Using it as a three-terminal potentiometer would require external wiring that violates the intended operating mode and may compromise linearity or reliability.

What is the maximum permissible wiper current for each DCP in the ISL90842WIV1427Z-TK?

The absolute maximum wiper current for each DCP in the ISL90842WIV1427Z-TK is ±3.0mA, as specified under Recommended Operating Conditions. Exceeding this limit risks parametric shift or long-term reliability degradation. For safe operation, ensure that the voltage across RH–RW does not exceed 30mV when set to minimum resistance (near 0Ω), and maintain power dissipation per DCP below 5mW.

How does the A0 and A1 pin configuration affect I²C communication with the ISL90842WIV1427Z-TK?

The A0 and A1 pins on the ISL90842WIV1427Z-TK configure the two least-significant bits of the 5-bit I²C device ID (01010xx), allowing up to four ISL90842WIV1427Z-TK devices to share the same I²C bus without address conflict. Logic levels on A0/A1 determine whether the device responds to 0101000 or 0101001 (A1=0,A0=0/1), 0101010 or 0101011 (A1=1,A0=0/1) identification bytes - enabling scalable multi-device calibration architectures.