Renesas ISL22424TFV14Z

Overview

ISL22424TFV14Z from Renesas (formerly Intersil) is a dual digitally controlled potentiometer (XDCP™) with 256-tap resolution, SPI interface, non-volatile wiper position storage, and dual-supply operation (VCC = 2.25–5.5V, V− = −2.25 to −5.5V). It integrates two independent 100kΩ DCPs in a 14-lead TSSOP package and supports voltage divider or rheostat configurations for precision analog control in harsh environments.

For engineers reviewing the ISL22424TFV14Z datasheet, ISL22424TFV14Z pinout, ISL22424TFV14Z application, or ISL22424TFV14Z equivalent, key selection criteria include bipolar supply capability, ±45 ppm/°C end-to-end tempco, 70Ω typical wiper resistance, shutdown mode (<4µA), and 13 GP non-volatile registers for lookup table storage.

Technical Context

The ISL22424TFV14Z implements two monolithic CMOS DCP arrays using resistor ladders and "make-before-break" CMOS switches, each controlled by an 8-bit volatile Wiper Register (WRi) and initialized from a non-volatile Initial Value Register (IVRi) at power-up. Its SPI Mode 0 interface supports daisy-chaining and allows direct read/write access to WRi, IVRi, and 13 general-purpose non-volatile registers.

It operates across −40°C to +125°C with dual supplies enabling true bipolar terminal voltage ranges (V− to VCC), supporting applications requiring negative reference rails. Wiper position recall occurs within 5ms after VCC exceeds 2.1V, and non-volatile writes complete in ≤20ms with 1M-cycle endurance and 50-year data retention at ≤+55°C.

Key Specifications

Pinout & Package

ISL22424TFV14Z is housed in a 14-lead TSSOP (M14.173) with exposed pad not internally connected. Pin 7 is NC; pins 8 (V−), 11 (GND), and 14 (VCC) define the dual-supply domain; SPI signals (SCK, SDI, SDO, CS) occupy pins 10, 12, 9, and 13 respectively; DCP0 uses RH0/RL0/RW0 (pins 1/2/3); DCP1 uses RH1/RL1/RW1 (pins 4/5/6).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22424TFV14Z, ISL22424WFR16Z-TK offers higher bandwidth in smaller footprint but requires layout change, while AD5242BRUZ100 trades bipolar capability for I²C simplicity and lower system-level integration effort.

Availability

ISL22424TFV14Z is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive battery monitoring, and precision instrumentation requiring stable component supply across extended temperature and dual-supply operation.

Supply support for ISL22424TFV14Z 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, emphasizing high-reliability, extended-temperature ICs for industrial and automotive markets.

The ISL22424TFV14Z belongs to Renesas' XDCP™ digitally controlled potentiometer family, designed specifically for replacing mechanical pots in harsh-environment analog trimming, calibration, and programmable gain/offset applications.

FAQ

What is the maximum SPI clock frequency supported by the ISL22424TFV14Z?

The ISL22424TFV14Z supports SPI clock frequencies up to 5MHz, with minimum cycle time of 200ns, high/low pulse widths of 100ns each, and setup/hold times of 50ns. This allows register updates in under 1.5µs, making it suitable for real-time analog parameter adjustment in closed-loop systems using the ISL22424TFV14Z.

Does the ISL22424TFV14Z retain wiper position after power loss?

Yes - the ISL22424TFV14Z stores wiper positions in non-volatile Initial Value Registers (IVR0/IVR1) with 50-year data retention at ≤+55°C and 1,000,000 write cycles. At power-up, the device automatically recalls IVR contents into volatile Wiper Registers (WR0/WR1), ensuring the ISL22424TFV14Z resumes its last programmed state without host intervention.

Can the ISL22424TFV14Z operate with only a single positive supply?

No - the ISL22424TFV14Z requires both VCC (2.25–5.5V) and V− (−2.25 to −5.5V) supplies to enable its bipolar DCP terminal voltage range. Operating with only VCC and GND violates absolute maximum ratings and disables proper wiper positioning; the ISL22424TFV14Z must be powered from dual rails to function as specified.

How many general-purpose registers does the ISL22424TFV14Z include, and what are their use cases?

The ISL22424TFV14Z includes 13 non-volatile general-purpose (GP) registers, each 8-bit, accessible via SPI. These are commonly used to store sensor calibration coefficients, channel-specific trim values, or lookup tables for multi-point linearization - extending the ISL22424TFV14Z's utility beyond basic potentiometer replacement into intelligent analog subsystems.

What happens to the DCP terminals during shutdown mode of the ISL22424TFV14Z?

In shutdown mode (SHDN bit = 0 in ACR), each DCP's RH and RL terminals become open-circuited, while RW is internally shorted to RL. This isolates the signal path and prevents leakage current, making the ISL22424TFV14Z safe for power-gated sections of analog circuits - a feature not found in most competing digital potentiometers.