Renesas ISL90460UIE527Z-TK

Overview

ISL90460UIE527Z-TK from Intersil is a volatile digitally controlled potentiometer (XDCP) configured as a 50kΩ rheostat with 32-tap resolution, 2-pin Up/Down interface, and operation from 2.7V to 5.5V supply. It delivers ±35ppm/°C tempco, 600Ω wiper resistance, and 25µA max active current for precision bias and gain control in analog signal paths.

For engineers reviewing the ISL90460UIE527Z-TK datasheet, ISL90460UIE527Z-TK pinout, ISL90460UIE527Z-TK application, or ISL90460UIE527Z-TK equivalent, key selection factors include its SC-70-5 package, volatile memory architecture, RH-to-GND variable resistance topology, and compatibility with low-power industrial sensor calibration and laser diode biasing circuits.

Technical Context

The ISL90460UIE527Z-TK implements a 31-element resistor array with electronic wiper switching controlled by CS and U/D inputs, enabling discrete 32-position adjustment without serial protocol overhead. Its volatile memory stores wiper position only while powered, requiring external logic to reinitialize on power-up.

Operation relies on edge-triggered wiper movement: CS falling edge latches U/D state to define increment/decrement direction, and subsequent U/D rising edges step the wiper. Settling time is 1µs per tap change, and absolute linearity is ±1 MI (minimum increment), supporting accurate analog voltage division in closed-loop systems.

Key Specifications

Pinout & Package

ISL90460UIE527Z-TK is housed in a 5-lead SC-70 (P5.049) plastic package, measuring 2.15mm × 1.35mm × 0.95mm, RoHS-compliant with 100% matte tin termination and MSL3 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL90460UIE527Z-TK, ISL90460TIH527Z-TK offers identical electrical performance in a mechanically distinct package, while ISL23511IRUZ-T7 trades volatile operation and simple up/down control for nonvolatile storage and I²C configurability-requiring firmware and layout changes.

Availability

ISL90460UIE527Z-TK is available at Aetrix Electronics and suitable for LCD contrast control, laser diode biasing, and industrial sensor calibration requiring stable component supply and long-term traceability.

Supply support for ISL90460UIE527Z-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, with focus on industrial, infrastructure, and high-reliability applications.

The ISL90460 product line delivers volatile digital potentiometers optimized for low-pin-count, low-power analog trimming in sensor interfaces, optical modules, and human-machine interface circuits.

FAQ

What is the resistance tolerance and temperature coefficient of the ISL90460UIE527Z-TK?

The ISL90460UIE527Z-TK has an end-to-end resistance (RTOTAL) of 50kΩ with ±20% initial tolerance (40kΩ to 60kΩ) and a typical temperature coefficient of ±35ppm/°C over -40°C to +85°C. This ensures predictable drift in precision analog circuits such as sensor signal conditioning and laser bias networks where thermal stability is critical. The ISL90460UIE527Z-TK datasheet specifies these values under recommended operating conditions.

Does the ISL90460UIE527Z-TK retain wiper position after power removal?

No, the ISL90460UIE527Z-TK uses volatile memory only; wiper position resets to default (mid-scale or last powered state depending on implementation) upon power loss. It does not include EEPROM or flash storage. System-level initialization logic must restore the desired tap setting at power-up. This behavior is inherent to the ISL90460UIE527Z-TK architecture and distinguishes it from nonvolatile alternatives like the ISL23511.

What is the maximum allowable voltage on the RH pin of the ISL90460UIE527Z-TK?

The RH pin of the ISL90460UIE527Z-TK must remain within 0V to VDD (2.7V–5.5V) under normal operation. Absolute maximum rating permits -1V to +7V relative to GND, but sustained operation outside the supply rail violates the recommended operating conditions and risks parametric shift or damage. For safe rheostat use, RH should connect only between VDD and GND, as specified in the ISL90460UIE527Z-TK functional description.

Can the ISL90460UIE527Z-TK be used as a three-terminal potentiometer?

No, the ISL90460UIE527Z-TK is internally configured as a two-terminal rheostat: RH connects to the wiper and one end of the resistor array, while the other end is permanently tied to GND. There is no accessible RL (low terminal) pin. The device functions exclusively as a variable resistance from RH to GND, not as a three-terminal voltage divider. This topology is fixed in the ISL90460UIE527Z-TK die design and package pinout.

What is the minimum pulse width required on the U/D pin for reliable stepping of the ISL90460UIE527Z-TK?

The ISL90460UIE527Z-TK requires a minimum U/D HIGH period (tIH) and LOW period (tIL) of 300ns each, per the datasheet timing specifications. To ensure robust operation across voltage and temperature, design margins recommend ≥500ns pulse width. This timing constraint applies regardless of CS state and is critical for achieving deterministic wiper movement in the ISL90460UIE527Z-TK's edge-triggered architecture.