Renesas ISL22323TFR16Z-TK

Overview

ISL22323TFR16Z-TK from Renesas (formerly Intersil) is a dual digitally controlled potentiometer (XDCP) with 256-tap resolution, I²C interface, and non-volatile wiper position storage. It features dual supply operation (V_CC = 2.25–5.5V, V₋ = −2.25 to −5.5V), 100kΩ end-to-end resistance, and operates across −40°C to +125°C for precision analog trimming in bipolar signal paths.

For engineers reviewing the ISL22323TFR16Z-TK datasheet, ISL22323TFR16Z-TK pinout, ISL22323TFR16Z-TK application, or ISL22323TFR16Z-TK equivalent, this device supports voltage divider and rheostat modes, offers ±0.2 LSB DNL (T-option), 13 general-purpose NV registers, and fast 1.5µs wiper response - critical for closed-loop calibration and programmable gain control.

Technical Context

The ISL22323TFR16Z-TK integrates two independent 8-bit DCPs with volatile Wiper Registers (WR0/WR1) and non-volatile Initial Value Registers (IVR0/IVR1), enabling power-up recall of last-set positions. Its "make-before-break" CMOS switch architecture ensures glitch-free wiper transitions during tap changes.

It implements a 16-pin QFN package with exposed pad tied to V₋, supporting bipolar terminal voltages (V₋ to V_CC) and enabling true symmetric rail-to-rail analog adjustment. The I²C interface supports up to 400kHz clock rate, three address pins (A0–A2), and eight-device bus addressing.

Key Specifications

Pinout & Package

ISL22323TFR16Z-TK uses a 16-lead QFN (4mm × 4mm, L16.4x4A) with exposed thermal pad internally connected to V₋. PCB land for the EPAD must be connected to the V₋ plane or left floating per TB389.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ100 and MCP45HV51-104E/ST, the ISL22323TFR16Z-TK uniquely delivers integrated dual DCPs with true bipolar supply support (V₋/V_CC), enabling symmetrical rail-to-rail wiper swing and eliminating external level shifters in AC-coupled designs - a key differentiator for high-fidelity sensor and audio signal paths.

Availability

ISL22323TFR16Z-TK is available at Aetrix Electronics and suitable for programmable gain amplifiers, sensor offset calibration, audio channel balancing, and laser diode bias control requiring stable component supply across automotive, industrial, and test equipment lifecycles.

Supply support for ISL22323TFR16Z-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 precision analog portfolio, including digitally controlled potentiometers for high-reliability industrial and automotive applications.

The ISL22323TFR16Z-TK belongs to Renesas' XDCP (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical trimmers in harsh-environment systems requiring non-volatile calibration, bipolar operation, and long-term parametric stability.

FAQ

What is the package type and footprint compatibility of the ISL22323TFR16Z-TK?

The ISL22323TFR16Z-TK uses a 16-lead QFN package (4mm × 4mm, L16.4x4A) with an exposed thermal pad internally connected to V₋. It is not pin-compatible with the 14-lead TSSOP variant (ISL22323TFV14Z), due to differing pin count, layout, and NC pin placement. PCB redesign is required when migrating between these packages. The QFN's thermal pad must be connected to the V₋ plane per TB389 guidelines.

Does the ISL22323TFR16Z-TK support true bipolar operation, and how is it implemented?

Yes, the ISL22323TFR16Z-TK supports true bipolar operation via separate V_CC (2.25–5.5V) and V₋ (−2.25 to −5.5V) supplies. This allows DCP terminals (RH/RL/RW) to swing from V₋ to V_CC, enabling AC-coupled signal adjustment and rail-to-rail wiper positioning without external level shifters. The exposed pad is internally tied to V₋, reinforcing this bipolar architecture.

How does non-volatile wiper storage work in the ISL22323TFR16Z-TK, and what is its endurance?

The ISL22323TFR16Z-TK stores wiper positions in non-volatile Initial Value Registers (IVR0/IVR1), which automatically load into volatile Wiper Registers (WR0/WR1) at power-up. Each IVR supports 1,000,000 write cycles and retains data for 50 years at ≤+55°C. Writes occur only when the VOL bit in the Access Control Register is cleared (VOL=0), and the SHDN bit remains active to prevent accidental updates during operation.

Can the ISL22323TFR16Z-TK be used in rheostat mode, and what are the linearity specifications?

Yes, each DCP in the ISL22323TFR16Z-TK can operate as a two-terminal variable resistor (rheostat) by connecting either RH or RL to the wiper. In rheostat mode with 100kΩ option, integral non-linearity is ±0.4 MI and differential non-linearity is ±0.15 MI - verified across −40°C to +125°C. These values ensure predictable resistance vs. code behavior for current-setting and bias applications.

What I²C timing parameters must be observed for reliable communication with the ISL22323TFR16Z-TK?

For reliable I²C operation, the ISL22323TFR16Z-TK requires SCL frequency ≤400kHz, t_LOW ≥1300ns, t_HIGH ≥600ns, and bus capacitance ≤400pF. Pull-up resistors must be sized per t_R/t_F specs: ~2kΩ for 400pF loads, ~15kΩ for 40pF. START/STOP setup/hold times (e.g., t_SU:STA ≥600ns) must also be met to avoid bus arbitration errors or missed commands.