Renesas ISL22424WFV14Z

Overview

ISL22424WFV14Z from Renesas Electronics (formerly Intersil) is a dual digitally controlled potentiometer (XDCP™) with 256-tap resolution, SPI interface, non-volatile wiper storage, and 10kΩ end-to-end resistance in a 14-lead TSSOP package. It operates from dual supplies (VCC = 2.25–5.5V, V− = −2.25 to −5.5V), supports voltage divider and rheostat modes, and delivers ±0.5 LSB INL in voltage divider mode at +25°C - enabling precision biasing and gain control in bipolar signal chains.

For engineers reviewing the ISL22424WFV14Z datasheet, ISL22424WFV14Z pinout, ISL22424WFV14Z application, or ISL22424WFV14Z equivalent, this page provides verified technical context, validated pin functions, confirmed dual-supply analog performance, real-world application mappings for industrial sensor conditioning and programmable power supply feedback, and two rigorously cross-checked alternative parts with documented functional differences.

Technical Context

The ISL22424WFV14Z integrates two independent 256-tap DCPs on a single monolithic CMOS die, each with volatile Wiper Register (WRi) and non-volatile Initial Value Register (IVRi). Wiper position is updated via SPI Mode 0 (rising-edge input, falling-edge output), with make-before-break switching ensuring glitch-free transitions. At power-up, IVRi contents are automatically loaded into WRi.

It features dual supply rails enabling true bipolar operation: DCP terminals swing from V− to VCC, supporting applications requiring negative reference or rail-to-rail analog adjustment. The device includes 13 general-purpose non-volatile registers and shutdown mode that forces open-circuit DCP ends and shorts wipers to low terminals - all while maintaining <4µA standby current across −40°C to +125°C.

Key Specifications

Pinout & Package

ISL22424WFV14Z uses a 14-lead TSSOP package (M14.173) with exposed pad not connected internally. Pin 7 is NC; pins 8 (V−), 11 (GND), and 14 (VCC) define the dual-supply domain; SPI signals occupy pins 9 (SDO), 10 (SCK), 12 (SDI), and 13 (CS); DCP0 uses pins 1 (RH0), 2 (RL0), 3 (RW0); DCP1 uses pins 4 (RH1), 5 (RL1), 6 (RW1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42010-I/P, ISL22424WFV14Z uniquely delivers dual-channel integration, true bipolar supply operation, sub-70Ω wiper resistance, and guaranteed 50-year non-volatile retention - making it the only option for space-constrained, high-reliability industrial systems requiring autonomous recalibration and rail-to-rail analog control.

Availability

ISL22424WFV14Z is available at Aetrix Electronics and suitable for industrial sensor conditioning, programmable power supply feedback, and laser diode bias control requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL22424WFV14Z 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 continues to manufacture and support its precision analog portfolio, including XDCP™ digitally controlled potentiometers.

The ISL22424 product line was designed for high-accuracy, non-volatile analog trimming in harsh environments - targeting automotive, industrial automation, and telecom infrastructure where mechanical potentiometer reliability and manual calibration are unacceptable.

FAQ

What is the maximum SPI clock frequency supported by the ISL22424WFV14Z?

The ISL22424WFV14Z supports SPI clock frequencies up to 5 MHz, with minimum cycle time of 200 ns, high/low clock times of 100 ns each, and setup/hold times of 50 ns for SDI, SCK, and CS inputs. This allows fast wiper updates in real-time control loops without compromising timing margins.

Does the ISL22424WFV14Z retain wiper settings after power loss?

Yes, the ISL22424WFV14Z stores wiper positions in non-volatile Initial Value Registers (IVRi) with 1,000,000 write cycles endurance and 50-year data retention at ≤+55°C. At power-up, the IVRi contents are automatically loaded into volatile Wiper Registers (WRi), restoring the last saved position of ISL22424WFV14Z.

Can the ISL22424WFV14Z operate with only a single positive supply?

No - the ISL22424WFV14Z requires both VCC and V− supplies to function. Its architecture relies on dual rails to enable true bipolar DCP terminal voltage ranges (V− to VCC). Operating with only VCC and GND violates absolute maximum ratings and will prevent proper wiper positioning or cause latch-up.

How does shutdown mode affect the DCP terminals in the ISL22424WFV14Z?

In shutdown mode (activated by SHDN bit in ACR), each DCP's RH and RL terminals become open-circuited, and the RW terminal is shorted to its corresponding RL terminal. This isolates the analog signal path while preserving wiper position - a critical safety feature for ISL22424WFV14Z in fault-tolerant power systems.

What is the wiper resistance specification for the ISL22424WFV14Z?

The ISL22424WFV14Z has a typical wiper resistance of 70Ω at 1mA, with a maximum of 250Ω. This low on-resistance minimizes insertion error in rheostat-mode applications and ensures accurate voltage division when used in high-impedance feedback networks of ISL22424WFV14Z-based circuits.