Renesas ISL23345TFVZ

Overview

ISL23345TFVZ from Renesas (formerly Intersil) is a volatile quad digitally controlled potentiometer (DCP) with I²C interface, 256-tap resolution, 100 kΩ end-to-end resistance, ±0.15 LSB typical DNL in voltage divider mode, and operation from 1.7V to 5.5V VCC and 1.2V to 5.5V VLOGIC. It delivers precise analog trimming in battery-powered instrumentation and power supply margining.

For engineers reviewing the ISL23345TFVZ datasheet, ISL23345TFVZ pinout, ISL23345TFVZ application, or ISL23345TFVZ equivalent, key selection criteria include its 20-lead TSSOP package, mid-scale power-on default (128), shutdown mode with internal RL connection, wiper resistance of 70 Ω typical at 3.3V, and guaranteed monotonicity across –40°C to +125°C.

Technical Context

The ISL23345TFVZ integrates four independent DCP cores on a monolithic CMOS IC, each implemented as a resistor ladder with CMOS switches and controlled by an 8-bit volatile Wiper Register (WRi). All wipers reset to 128 (mid-scale) at power-up and support make-before-break switching during tap transitions.

Its dual-supply architecture separates analog (VCC) and logic (VLOGIC) domains, enabling direct interfacing with 1.2V I²C buses without level shifters. Three address pins (A0–A2) allow up to eight devices on one bus, and the Access Control Register (ACR) provides global shutdown control that forces open-circuit end-to-end resistance while connecting RW to RL via a 2 kΩ path.

Key Specifications

Pinout & Package

ISL23345TFVZ is housed in a Pb-free, RoHS-compliant 20-lead TSSOP package (MDP0044), 6.5 mm × 4.4 mm × 1.2 mm, with exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL23345TFVZ, ISL23325WFVZ offers lower integration but identical per-channel specs and pin compatibility for drop-in replacement in single-DXP designs, while AD5242BRUZ100 lacks VLOGIC independence and quad functionality, limiting use in mixed-voltage or multi-channel systems.

Availability

ISL23345TFVZ is available at Aetrix Electronics and suitable for power supply margining, sensor trimming, battery-powered instrument gain control, and RF amplifier bias compensation requiring stable component supply across extended temperature ranges.

Supply support for ISL23345TFVZ 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, formed from the merger of Intersil and Renesas, is a global semiconductor leader delivering high-performance analog, mixed-signal, and power management solutions.

The ISL23345TFVZ belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) product line, engineered for precision analog parameter adjustment in space-constrained, low-power, and wide-temperature industrial and automotive systems.

FAQ

What is the default wiper position of the ISL23345TFVZ at power-up?

The ISL23345TFVZ powers up with all four wiper registers (WR0–WR3) preset to 128 (0x80 hex), positioning each wiper at mid-scale-exactly halfway between RL and RH terminals. This behavior is guaranteed across the full –40°C to +125°C temperature range and does not require I²C initialization to achieve a known starting state. The ISL23345TFVZ maintains this deterministic startup condition regardless of VCC ramp rate or sequence.

Does the ISL23345TFVZ support true 1.2V I²C bus operation?

Yes-the ISL23345TFVZ features a dedicated VLOGIC pin that accepts 1.2V to 5.5V, enabling direct connection to 1.2V I²C masters without external level shifters. Input thresholds (VIH = 0.7×VLOGIC, VIL = 0.3×VLOGIC) and internal level-shifting logic ensure reliable communication even when VLOGIC = 1.2V and VCC = 5.5V. The ISL23345TFVZ has been characterized for full I²C timing compliance-including tLOW, tHIGH, and tSU:STA-at 1.2V VLOGIC.

How does shutdown mode affect the wiper connections in the ISL23345TFVZ?

In shutdown mode (SHDN bit = 0 in ACR register), the ISL23345TFVZ disconnects all DCP resistive elements from RH–RL paths, forcing end-to-end open circuit, while internally connecting each RW pin to its corresponding RL pin through a 2 kΩ series resistor. This prevents floating outputs and minimizes leakage. Wiper register values (WR0–WR3) are retained, and wipers return to their pre-shutdown positions within 1.5 µs after exit.

What is the maximum allowable wiper current for the ISL23345TFVZ?

The ISL23345TFVZ specifies a maximum continuous wiper current (IW) of ±3 mA under recommended operating conditions, with an absolute maximum rating of ±6 mA for ≤10 seconds. Exceeding ±3 mA risks increased wiper resistance drift and long-term reliability degradation. For 100 kΩ configuration, this limits usable voltage swing across RW–RL or RW–RH to ≤300 mV to stay within safe current bounds.

Can the ISL23345TFVZ be used in rheostat mode, and what are its linearity specifications?

Yes-the ISL23345TFVZ supports rheostat mode (RW–RL or RW–RH, with the third terminal unconnected). In this configuration, it guarantees ±0.3 MI typical integral non-linearity (RINL) and ±0.15 MI typical differential non-linearity (RDNL) for the 100 kΩ version at VCC = 2.7V–5.5V. These values reflect monotonic resistance change per tap step, critical for precision current-source or oscillator frequency tuning applications.