Renesas ISL90460WIH527Z-TK

Overview

ISL90460WIH527Z-TK from Intersil is a volatile, single-channel, 32-tap digitally controlled potentiometer (XDCP) configured as a rheostat with RH-to-GND variable resistance, 10kΩ end-to-end resistance, ±35ppm/°C tempco, and 2-pin Up/Down interface - used for LCD contrast control and sensor bias trimming in industrial systems.

For engineers reviewing the ISL90460WIH527Z-TK datasheet, ISL90460WIH527Z-TK pinout, ISL90460WIH527Z-TK application, or ISL90460WIH527Z-TK equivalent, key selection criteria include wiper settling time (1µs), standby current (0.3µA), 5-lead SOT-23 package compatibility, and volatile memory behavior requiring host initialization at power-up.

Technical Context

The ISL90460WIH527Z-TK implements a 31-element resistor array with electronic wiper switching controlled by CS and U/D inputs; wiper position is stored in volatile memory only when CS transitions high, and no nonvolatile storage is present. It operates exclusively as a 2-terminal rheostat (RH–GND), not a 3-terminal potentiometer.

Its 2-pin serial interface requires CS assertion before each U/D toggle to increment/decrement wiper position; timing constraints include tCU (25ns), tIC (25ns), and tSETTLE (1µs) for stable RH output after movement. The device draws ≤25µA active current at 3V and supports 2.7V–5.5V supply range.

Key Specifications

Pinout & Package

ISL90460WIH527Z-TK is housed in a Pb-free 5-lead SOT-23 package (JEDEC MO-178AA, pkg drawing P5.064), measuring 2.80mm × 1.90mm × 1.10mm, with gull-wing leads and 0.95mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL90460WIH527Z-TK, ISL90460TIH527Z-TK offers identical performance and drop-in compatibility, while ISL23511IRUZ-T7 trades simplicity and small size for nonvolatility and SPI flexibility - making the former ideal for cost-sensitive replacements and the latter for feature-rich recalibration needs.

Availability

ISL90460WIH527Z-TK is available at Aetrix Electronics and suitable for LCD contrast control, sensor bias adjustment, and laser diode driver tuning requiring stable component supply and legacy design support.

Supply support for ISL90460WIH527Z-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 computing markets.

The ISL90460 product line delivers volatile digital potentiometers optimized for low-pin-count, low-power analog trimming in space-constrained systems where EEPROM overhead and SPI complexity are undesirable.

FAQ

What is the resistance tolerance and temperature coefficient of the ISL90460WIH527Z-TK?

The ISL90460WIH527Z-TK has an end-to-end resistance (RTOTAL) of 10kΩ with ±20% initial tolerance and a typical temperature coefficient of ±35ppm/°C over −40°C to +85°C. This ensures stable rheostat behavior in industrial environments where thermal drift must be minimized during sensor calibration or display biasing tasks. The ISL90460WIH527Z-TK achieves this using matched polysilicon resistor elements and CMOS switch design.

Does the ISL90460WIH527Z-TK retain its wiper position after power cycling?

No, the ISL90460WIH527Z-TK uses volatile memory only - wiper position is lost upon power removal and resets to an undefined state at startup. Host firmware must reinitialize the tap position via the U/D/CS interface after each power-on. This behavior is inherent to the ISL90460WIH527Z-TK architecture and distinguishes it from nonvolatile alternatives like the ISL23511IRUZ-T7.

What is the maximum allowable voltage on the RH pin of the ISL90460WIH527Z-TK?

The RH pin of the ISL90460WIH527Z-TK must remain within the supply rails: 0V to VDD. Absolute maximum rating specifies −1V to +7V on RH relative to GND, but operational use requires RH voltage to stay between GND and VDD (2.7V–5.5V) to avoid forward-biasing internal ESD structures or violating the potentiometer's specified VR range. Exceeding VDD risks latch-up or parametric shift in the ISL90460WIH527Z-TK.

Can the ISL90460WIH527Z-TK be used as a 3-terminal potentiometer?

No, the ISL90460WIH527Z-TK is internally configured exclusively as a 2-terminal rheostat (RH–GND). The datasheet confirms RH connects to the wiper and one end of the resistor array, while the other end ties directly to GND - no independent RL or mid-point terminal is accessible. This fixed topology means the ISL90460WIH527Z-TK cannot function as a voltage divider or standard 3-terminal potentiometer.

What is the minimum pulse width required on the U/D pin for reliable wiper stepping in the ISL90460WIH527Z-TK?

The ISL90460WIH527Z-TK requires a minimum U/D LOW period (t_lL) and HIGH period (t_lH) of 300ns each, per the timing specification table. To ensure robust operation across voltage and temperature, design margins should target ≥500ns pulse width. This timing constraint applies only when CS is asserted low; the ISL90460WIH527Z-TK ignores U/D edges when CS is high.