Renesas ISL90460UIH527-TK

Overview

ISL90460UIH527-TK from Intersil is a volatile digitally controlled potentiometer (XDCP) configured as a 50kΩ rheostat with 32-tap resolution, ±35ppm/°C tempco, and 2-pin Up/Down interface, used for precision bias and gain adjustment in sensor signal conditioning circuits.

For engineers reviewing the ISL90460UIH527-TK datasheet, ISL90460UIH527-TK pinout, ISL90460UIH527-TK application, or ISL90460UIH527-TK equivalent, key selection considerations include wiper resistance (600Ω), active current (25µA max), standby supply current (0.3µA), and SOT-23-5 package compatibility with space-constrained analog tuning designs.

Technical Context

The ISL90460UIH527-TK implements a 31-element resistor array with electronic wiper switching controlled by CS and U/D inputs, forming a variable RH-to-GND resistance path. Its volatile memory stores wiper position only while powered, requiring reinitialization on power-up.

Operation relies on edge-triggered up/down counting synchronized to CS assertion: wiper moves one tap per U/D rising edge when CS is low, with no wraparound at extremes and 1µs output settling time after multi-tap movement.

Key Specifications

Pinout & Package

ISL90460UIH527-TK is housed in a 5-lead SOT-23 plastic package (JEDEC MO-178AA, pkg drawing P5.064), measuring 2.80mm × 1.90mm × 1.10mm, with gull-wing leads and Pb-free matte tin terminations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL90460UIH527-TK, the TIH527Z-TK offers higher resistance scaling for reduced current consumption in high-Z nodes, while the ISL90461UIH527Z-TK adds nonvolatile retention-both maintain identical SOT-23-5 footprint and Up/Down protocol compatibility.

Availability

ISL90460UIH527-TK is available at Aetrix Electronics and suitable for LCD contrast control, laser diode biasing, and pressure sensor offset trimming requiring stable component supply and long-term industrial temperature support.

Supply support for ISL90460UIH527-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 is a precision analog and power management semiconductor provider, now part of Renesas Electronics, delivering high-reliability solutions for industrial, infrastructure, and consumer markets.

The ISL90460UIH527-TK belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in analog signal conditioning, sensor calibration, and power supply feedback loops.

FAQ

What is the resistance tolerance and temperature coefficient of the ISL90460UIH527-TK?

The ISL90460UIH527-TK has a nominal end-to-end resistance of 50kΩ with ±20% initial tolerance (derived from 40kΩ min / 60kΩ max per datasheet Table on Page 3) and a typical temperature coefficient of ±35ppm/°C over –40°C to +85°C. This ensures predictable drift behavior in industrial environments where thermal stability is critical for calibration integrity.

Does the ISL90460UIH527-TK retain its wiper setting after power removal?

No, the ISL90460UIH527-TK uses volatile memory only. Wiper position is lost when VDD is removed and must be reinitialized by the host controller upon power-up. This design eliminates EEPROM wear-out and write latency, making it optimal for applications requiring frequent dynamic recalibration rather than persistent settings.

What is the maximum allowable voltage on the RH pin of the ISL90460UIH527-TK?

The RH pin of the ISL90460UIH527-TK must remain within the same voltage range as VDD, i.e., 0V to VDD (2.7V–5.5V). Exceeding VDD or going below GND violates absolute maximum ratings and may damage the internal wiper switches. The device does not support rail-to-rail operation beyond its supply rails.

Can the ISL90460UIH527-TK be used in rheostat mode only, or does it support potentiometer (three-terminal) configuration?

The ISL90460UIH527-TK is internally configured as a rheostat: RH connects to the wiper and one end of the resistor array, while the other end is permanently tied to GND. It does not expose the low-side terminal (RL) externally, so true three-terminal potentiometer use is not supported. Its design targets single-ended variable resistance applications.

What is the minimum pulse width required on the U/D pin for reliable wiper stepping in the ISL90460UIH527-TK?

The ISL90460UIH527-TK requires a minimum U/D HIGH period (t_IH) and LOW period (t_IL) of 300ns each, per the timing specifications on Page 4 of FN8225 Rev 4.00. To ensure robust operation, drive signals should exceed 500ns pulse width with clean edges and avoid violating setup/hold times relative to CS transitions.