Renesas ISL22317TFRTZ-TK

Overview

ISL22317TFRTZ-TK from Renesas Electronics (formerly Intersil) is a precision single digitally controlled potentiometer (XDCP™) with I²C interface, 128-tap resolution, ±10 ppm/°C end-to-end temperature coefficient, and non-volatile EEPROM storage of wiper position. It operates from 2.7V to 5.5V and delivers 99% typical resistance accuracy across temperature for high-stability analog tuning in calibration circuits.

For engineers reviewing the ISL22317TFRTZ-TK datasheet, ISL22317TFRTZ-TK pinout, ISL22317TFRTZ-TK application, or ISL22317TFRTZ-TK equivalent, this device supports precise rheostat or voltage-divider configurations, requires an external 0.5% reference resistor (100 kΩ for this variant), and enables zero-compensated wiper resistance with monotonic performance over –40°C to +125°C.

Technical Context

The ISL22317TFRTZ-TK implements a resistor ladder with CMOS switches and "make-before-break" wiper switching logic. Its 7-bit volatile Wiper Register (WR) controls tap position, while the non-volatile Initial Value Register (IVR) stores power-up default (pre-programmed to 40h). The device mirrors the temperature coefficient and resistance value of an externally connected 100 kΩ ±0.5% reference resistor across REF_A/REF_B pins.

It supports two operational modes selected via Mode Select Register: voltage-divider mode (RH–RL–RW, three-terminal) or rheostat mode (RW–RL only, RH floating). Precision mode is enabled by default, delivering <±1% RTOTAL tolerance and ±0.1 LSB INL/DNL in voltage-divider mode - all validated over –40°C to +125°C.

Key Specifications

Pinout & Package

ISL22317TFRTZ-TK uses a 10-lead 3 mm × 3 mm thin DFN package (0.75 mm max height, 0.65 mm pitch) with exposed thermal pad internally connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-100 and MCP45HV51-104E/ST, the ISL22317TFRTZ-TK uniquely combines external reference mirroring (enabling ±10 ppm/°C TC), non-volatile wiper recall, and zero-compensated wiper resistance - making it optimal for unattended, high-stability analog tuning where calibration persistence and thermal tracking are critical.

Availability

ISL22317TFRTZ-TK is available at Aetrix Electronics and suitable for precision calibration, DC margining, and analog signal conditioning applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ISL22317TFRTZ-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

Renesas Electronics acquired Intersil in 2017 and maintains its high-precision analog portfolio. Renesas is a global semiconductor leader focused on microcontrollers, analog, power, and connectivity solutions for industrial, automotive, and infrastructure markets.

The ISL22317TFRTZ-TK belongs to Renesas' XDCP™ (eXternally-referenced Digitally Controlled Potentiometer) family, designed specifically for applications demanding ultra-stable, field-calibratable resistance without manual adjustment or complex software compensation.

FAQ

What is the total resistance value and tolerance of the ISL22317TFRTZ-TK?

The ISL22317TFRTZ-TK is the T-option variant with a nominal total resistance of 100 kΩ and a tolerance of ±1% over temperature. This value is achieved by mirroring an external 100 kΩ ±0.5% reference resistor connected between REF_A and REF_B pins - not derived from internal resistor elements alone.

Does the ISL22317TFRTZ-TK retain its wiper position after power cycling?

Yes. The ISL22317TFRTZ-TK stores the wiper position in non-volatile EEPROM (Initial Value Register). At power-up, the device automatically recalls this stored value into the volatile Wiper Register, restoring the exact resistance setting without host intervention - supporting fully autonomous operation.

Can the ISL22317TFRTZ-TK operate as a two-terminal variable resistor?

Yes. The ISL22317TFRTZ-TK supports rheostat mode (two-terminal operation) by setting the Mode Select Register bit to 0. In this mode, RH is left unconnected, and resistance is adjusted between RW and RL terminals - ideal for current-limiting or bias-setting applications.

What is the required external reference resistor for the ISL22317TFRTZ-TK?

The ISL22317TFRTZ-TK requires a 100 kΩ ±0.5% resistor connected between REF_A and REF_B. This resistor defines both the absolute resistance value and the ±10 ppm/°C temperature coefficient. Connecting REF_A to GND will damage the device - REF_B may be tied to GND only if RL is also grounded.

What I²C address options does the ISL22317TFRTZ-TK support?

The ISL22317TFRTZ-TK supports two I²C slave addresses: 0x50 and 0x54. The A1 pin selects the LSB of the 7-bit address - logic high yields 0x54, logic low yields 0x50. This allows up to two ISL22317TFRTZ-TK devices on the same I²C bus without address conflict.