Renesas ISL90810UIU8Z-TK

Overview

ISL90810UIU8Z-TK from Intersil is a single-channel, 256-tap digitally controlled potentiometer (XDCP™) with I²C interface, 50kΩ end-to-end resistance, ±0.5 LSB integral nonlinearity in voltage divider mode, and 70Ω typical wiper resistance at 3.3V - used for precision analog trimming in sensor signal conditioning and power supply feedback loops.

For engineers reviewing the ISL90810UIU8Z-TK datasheet, ISL90810UIU8Z-TK pinout, ISL90810UIU8Z-TK application, or ISL90810UIU8Z-TK equivalent, key selection criteria include I²C-compatible volatile wiper register control, mid-scale power-on default (128), low 5µA max standby current, 2.7V–5.5V supply range, and MSOP-8 packaging for space-constrained analog calibration circuits.

Technical Context

The ISL90810UIU8Z-TK implements a monolithic CMOS DCP using resistor ladders and CMOS switches, with wiper position directly controlled via an 8-bit volatile Wiper Register (WR) accessed over standard I²C. It operates as a slave device with fixed 00h address and 0101000x identification byte format.

In voltage divider mode (RH = VCC, RL = GND), it delivers ratiometric performance with ±4 ppm/°C temperature coefficient and <±0.5 LSB full-scale error across –40°C to +85°C; in rheostat mode (RW–RL or RW–RH), it maintains monotonicity and ±35 ppm/°C resistance TC over the same range.

Key Specifications

Pinout & Package

ISL90810UIU8Z-TK is housed in an 8-lead MSOP package (JEDEC MO-187-AA compliant, 3.0mm × 3.0mm body, 0.65mm pitch), RoHS-compliant with matte tin terminations and MSL3 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-50 and MCP4017T-503E/MS, the ISL90810UIU8Z-TK offers superior linearity (±0.5 LSB vs ≥±1 LSB), lower wiper resistance (70Ω vs ≥125Ω), and guaranteed mid-scale power-on state - making it optimal for precision analog trimming where deterministic startup and minimal signal path degradation are critical.

Availability

ISL90810UIU8Z-TK is available at Aetrix Electronics and suitable for temperature sensor calibration, programmable power supply feedback, LCD contrast control, and audio volume adjustment requiring stable component supply and long-term obsolescence management.

Supply support for ISL90810UIU8Z-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) is a provider of precision analog and power management ICs, with quality-certified manufacturing per ISO9001 and broad industrial reliability validation.

The ISL90810UIU8Z-TK belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in high-reliability analog signal conditioning and closed-loop control systems.

FAQ

What is the power-on behavior of the ISL90810UIU8Z-TK?

The ISL90810UIU8Z-TK powers up with its wiper register (WR) automatically loaded to 128 (mid-scale), positioning the RW terminal at the center of the 50kΩ resistor ladder. This occurs when VCC exceeds 1.8V, with full initialization completed within 3ms after VCC ramp. The ISL90810UIU8Z-TK does not retain wiper position across power cycles since WR is volatile memory.

Does the ISL90810UIU8Z-TK support nonvolatile storage of wiper settings?

No, the ISL90810UIU8Z-TK contains only volatile wiper register (WR) memory. Wiper position is lost upon power removal and resets to 128 at next power-on. It does not include EEPROM or other nonvolatile storage. For persistent settings, external microcontroller firmware must reprogram the WR after each power-up sequence.

Can the ISL90810UIU8Z-TK be used in rheostat mode with only two terminals?

Yes, the ISL90810UIU8Z-TK supports rheostat operation by connecting either RW–RL or RW–RH while leaving the third terminal unconnected. In this configuration, resistance varies from near 0Ω to 50kΩ with ±0.5 MI integral nonlinearity and ±35 ppm/°C temperature coefficient - verified for tap positions 32–255 per datasheet Figure 7 and 8.

What is the maximum allowable voltage across the DCP terminals of the ISL90810UIU8Z-TK?

The absolute maximum voltage between any DCP pin (RH, RW, RL) and GND is limited to VCC, and the maximum voltage between RH and RL is constrained by the 5mW power rating. At 50kΩ, this corresponds to ≤15.8V peak-to-peak (V = √(P×R)). Exceeding these limits risks permanent damage per Absolute Maximum Ratings on page 3 of FN8234 Rev 3.00.

How does the ISL90810UIU8Z-TK handle I²C bus contention or glitches during power-up?

The ISL90810UIU8Z-TK ignores all I²C activity during power-up until VCC exceeds Vpor (1.8–2.6V) and internal initialization completes (~3ms). SDA is held in high-impedance input mode at power-on, preventing bus contention. START/STOP detection resumes only after tD delay, and invalid commands before that are discarded without ACK response.