Renesas ISL22313TFU10Z-TK

Overview

ISL22313TFU10Z-TK from Renesas (formerly Intersil) is a single-channel digitally controlled potentiometer (XDCP™) with 256 taps, I²C interface, non-volatile wiper position storage, and dual-supply operation (VCC = +2.25V to +5.5V, V− = −2.25V to −5.5V). It delivers 100 kΩ end-to-end resistance, ±50 ppm/°C end-to-end temperature coefficient, and operates across −40°C to +125°C for precision analog trimming in bipolar signal paths.

For engineers reviewing the ISL22313TFU10Z-TK datasheet, ISL22313TFU10Z-TK pinout, ISL22313TFU10Z-TK application, or ISL22313TFU10Z-TK equivalent, key selection criteria include dual-rail DCP terminal voltage range (V− to VCC), 14 general-purpose non-volatile registers for lookup table storage, shutdown mode with RW-to-RL shorting, and guaranteed 1,000,000 EEPROM write cycles with 50-year data retention at ≤+55°C.

Technical Context

The ISL22313TFU10Z-TK implements a resistor ladder with CMOS switches in "make-before-break" wiper transition logic, ensuring glitch-free tap changes. Its volatile Wiper Register (WR) controls real-time wiper position, while the non-volatile Initial Value Register (IVR) restores power-up state - both accessible via I²C using a 7-bit slave address determined by A0/A1 pins.

It supports full I²C protocol compliance at 400 kHz, including START/STOP detection, ACK handshaking, and address-matching logic. The device features dedicated shutdown control (ACR[6]) that forces RH–RL open-circuit and shorts RW to RL, reducing leakage and enabling safe system-level power sequencing.

Key Specifications

Pinout & Package

ISL22313TFU10Z-TK uses a 10-lead MSOP package (M10.118), RoHS-compliant with Pb-free plus anneal finish. Pin layout is optimized for compact PCB placement and thermal performance (θJA = 120°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-100 and MAX5482ETE+, the ISL22313TFU10Z-TK uniquely combines bipolar rail support, non-volatile wiper initialization, and 14 GP registers - making it the only option for self-contained, fail-safe, field-programmable analog trimming in harsh-environment dual-supply systems.

Availability

ISL22313TFU10Z-TK is available at Aetrix Electronics and suitable for industrial motor drives, automotive cabin electronics, medical diagnostic equipment, and aerospace sensor interfaces requiring stable component supply across extended temperature and lifetime requirements.

Supply support for ISL22313TFU10Z-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 full product support, datasheet documentation, and long-term supply commitment for legacy Intersil precision analog ICs.

The ISL22313 series was designed specifically for high-reliability analog trimming in dual-supply environments - targeting applications where mechanical potentiometers fail due to vibration, contamination, or calibration drift.

FAQ

What is the total resistance tolerance of the ISL22313TFU10Z-TK?

The ISL22313TFU10Z-TK has a total resistance tolerance of ±20% across its 100 kΩ rating. This specification applies to the RH-to-RL end-to-end resistance and is measured under recommended operating conditions. The tolerance impacts absolute gain/offset accuracy but does not affect relative tap-to-tap linearity, which remains within ±0.2 LSB for differential non-linearity in voltage divider mode.

Does the ISL22313TFU10Z-TK support true bipolar operation?

Yes, the ISL22313TFU10Z-TK supports true bipolar operation: its DCP terminals (RH, RW, RL) operate from V− to VCC, where V− can be as low as −5.5 V and VCC as high as +5.5 V. This allows analog signals to swing fully across both positive and negative rails - essential for AC-coupled instrumentation, audio, and sensor signal conditioning where ground-referenced pots would introduce clipping or distortion.

How many non-volatile registers does the ISL22313TFU10Z-TK include beyond the wiper register?

The ISL22313TFU10Z-TK includes 14 general-purpose non-volatile registers in addition to the non-volatile Initial Value Register (IVR). All 15 non-volatile locations (IVR + 14 GP registers) retain data for 50 years at temperatures ≤+55°C and withstand 1,000,000 write cycles - enabling persistent storage of calibration coefficients, device-specific trim values, or lookup tables without external EEPROM.

What happens to the wiper position during power-up of the ISL22313TFU10Z-TK?

At power-up, the ISL22313TFU10Z-TK first resets the volatile Wiper Register (WR) to 0x80 (mid-scale), then loads the stored value from the non-volatile Initial Value Register (IVR) into WR once VCC exceeds the power-on recall threshold (1.9–2.1 V). This ensures predictable mid-scale default behavior during brown-out conditions and precise restoration of last-saved position under normal startup.

Can the ISL22313TFU10Z-TK be used in shutdown mode to isolate analog signals?

Yes - when the SHDN bit (ACR[6]) is set to 0, the ISL22313TFU10Z-TK enters shutdown mode: RH–RL becomes an open circuit and RW is shorted to RL. This provides a defined low-impedance path (≤70 Ω) while disconnecting the high-side terminal, enabling safe analog signal isolation during system sleep or fault conditions without external switches or relays.