Renesas ISL23325TFVZ

Overview

ISL23325TFVZ from Renesas Electronics (formerly Intersil) is a dual, volatile, 256-tap digitally controlled potentiometer (DCP) with I²C interface, 100 kΩ total resistance, 14-lead TSSOP package, and extended industrial temperature range (–40°C to +125°C). It functions as two independent programmable resistive dividers or rheostats in analog signal conditioning circuits for precision trimming and bias control.

For engineers reviewing the ISL23325TFVZ datasheet, ISL23325TFVZ pinout, ISL23325TFVZ application, or ISL23325TFVZ equivalent, key selection considerations include its 100 kΩ end-to-end resistance, dual-channel wiper register control, VLOGIC-supported 1.2 V logic compatibility, shutdown mode behavior, and guaranteed monotonicity in voltage divider and rheostat modes.

Technical Context

The ISL23325TFVZ integrates two independent DCP cores on a single monolithic CMOS die, each with an 8-bit volatile wiper register (WR0/WR1), make-before-break switching, and direct I²C read/write access. Its resistor array uses precision-matched thin-film elements with ±2% end-to-end tolerance and 45 ppm/°C temperature coefficient (T option).

It supports dual supply domains: VCC (1.7 V to 5.5 V) powers analog circuitry and DCP terminals, while VLOGIC (1.2 V to 5.5 V) independently powers the I²C interface and internal level shifter-enabling direct connection to low-voltage microcontrollers without external translation.

Key Specifications

Pinout & Package

ISL23325TFVZ is housed in a RoHS-compliant, 14-lead TSSOP package (M14.173) with 0.65 mm pitch and exposed pad thermal enhancement.

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 ISL23325TFVZ uniquely delivers dual-channel control with independent 1.2 V logic compatibility and guaranteed monotonicity-making it optimal for compact, mixed-voltage, battery-sensitive trimming applications where space and power are constrained.

Availability

ISL23325TFVZ is available at Aetrix Electronics and suitable for power supply margining, RF amplifier biasing, sensor trimming, and battery-powered instrument gain adjustment requiring stable component supply across automotive, industrial, and medical product lifecycles.

Supply support for ISL23325TFVZ 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 Corporation is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications.

The ISL23325TFVZ belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, engineered specifically for high-accuracy, low-power, and thermally robust analog trimming in mission-critical systems where mechanical potentiometers fail.

FAQ

What is the default wiper position of the ISL23325TFVZ at power-on?

At power-on, both wiper registers (WR0 and WR1) of the ISL23325TFVZ reset to 0x80 (128 decimal), positioning each wiper at mid-scale-i.e., exactly halfway between RH and RL terminals. This ensures a known, safe, and symmetric starting point for analog control before host firmware initialization.

Does the ISL23325TFVZ support true 1.2 V I²C bus operation without level shifting?

Yes-the ISL23325TFVZ features a dedicated VLOGIC pin that accepts 1.2 V to 5.5 V, enabling direct connection to 1.2 V I²C masters. Its internal level shifter guarantees valid logic thresholds and timing compliance per I²C specification-even when VCC operates at 5 V-eliminating external translation components.

Can the ISL23325TFVZ be used in rheostat mode, and what is its wiper resistance specification?

Yes-the ISL23325TFVZ supports rheostat mode (RW–RL or RW–RH) with guaranteed monotonicity. Its wiper resistance is 70 Ω typical at VCC = 3.3 V, rising to 580 Ω at VCC = 1.7 V. This low on-resistance minimizes insertion loss and gain error in current-sensing and feedback-path applications.

How does the shutdown mode affect the wiper connections in the ISL23325TFVZ?

In shutdown mode (SHDN bit = 0 in ACR), the ISL23325TFVZ forces an open-circuit condition between RH and RL while internally connecting RW to RL through a 2 kΩ series resistor. This prevents floating nodes and unintended current flow-preserving system safety and enabling ultra-low-power sleep states.

What is the maximum I²C clock frequency supported by the ISL23325TFVZ?

The ISL23325TFVZ supports standard-mode I²C operation up to 400 kHz. All timing parameters-including tLOW (1300 ns), tHIGH (600 ns), and tSU:DAT (100 ns)-are fully characterized and guaranteed across the full –40°C to +125°C temperature range and 1.2 V to 5.5 V VLOGIC supply.