Renesas ISL23318WFUZ-TK

Overview

ISL23318WFUZ-TK from Renesas Electronics is a volatile, low-voltage, 128-tap digitally controlled potentiometer (XDCP™) with I²C interface, 10kΩ total resistance, ±0.15 LSB integral nonlinearity, and operation from 1.7V VCC / 1.2V VLOGIC - used for precision gain adjustment in battery-powered instrumentation and sensor trimming circuits.

For engineers reviewing the ISL23318WFUZ-TK datasheet, ISL23318WFUZ-TK pinout, ISL23318WFUZ-TK application, or ISL23318WFUZ-TK equivalent, key selection considerations include its dual-supply I²C compatibility (VLOGIC independent of VCC), shutdown mode with internal RW–RL short, 70Ω typical wiper resistance at 3.3V, and extended industrial temperature range (−40°C to +125°C).

Technical Context

The ISL23318WFUZ-TK implements a monolithic CMOS resistor ladder with CMOS wiper switches, controlled via a volatile 7-bit Wiper Register (WR) accessible through standard I²C protocol. Its make-before-break switching ensures glitch-free tap transitions during wiper movement.

It supports up to four devices per I²C bus using hardwired A0/A1 address pins, operates with no external level shifter down to 1.2V logic, and features power-on reset to mid-scale (64 decimal). Shutdown mode forces RH–RL open-circuit while internally connecting RW to RL via ~2kΩ.

Key Specifications

Pinout & Package

ISL23318WFUZ-TK is packaged in a Pb-free, RoHS-compliant 10-lead MSOP (M10.118) with 0.5mm pitch and exposed pad for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP4017T-103E/MS, the ISL23318WFUZ-TK uniquely balances ultra-low-voltage I²C interoperability, shutdown safety, and precision analog performance - making it optimal for thermally demanding, battery-constrained systems requiring frequent real-time adjustment.

Availability

ISL23318WFUZ-TK is available at Aetrix Electronics and suitable for gain adjustment in portable instruments, trimming sensor circuits, power supply margining, RF power amplifier bias compensation, and industrial temperature monitoring requiring stable component supply across extended lifecycles.

Supply support for ISL23318WFUZ-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 is a global semiconductor leader delivering high-performance, low-power analog and mixed-signal solutions for automotive, industrial, and IoT applications.

The ISL23318 belongs to Renesas' XDCP™ (eXternally Digital Controlled Potentiometer) family, designed specifically for replacing mechanical potentiometers in precision analog tuning applications where reliability, programmability, and wide supply flexibility are essential.

FAQ

What is the default wiper position of the ISL23318WFUZ-TK at power-on?

The ISL23318WFUZ-TK powers up with its volatile Wiper Register (WR) preset to 64 decimal (0x40), placing the wiper at mid-scale between RH and RL terminals. This ensures a known, safe startup state for voltage divider or rheostat configurations without requiring host initialization before first use. The ISL23318WFUZ-TK maintains this behavior across all operating conditions and temperature ranges.

Does the ISL23318WFUZ-TK support true 1.2V I²C communication without level shifting?

Yes - the ISL23318WFUZ-TK features a dedicated VLOGIC pin that accepts 1.2V to 5.5V, enabling direct connection to 1.2V or 1.8V microcontroller I²C buses without external level translators. Its input thresholds scale with VLOGIC (VIH = 0.7×VLOGIC), and SDA/SCL pin capacitance is limited to 10pF, ensuring robust timing compliance even at lowest logic voltages. This capability is intrinsic to the ISL23318WFUZ-TK design.

How does shutdown mode affect the ISL23318WFUZ-TK's terminal connections?

In shutdown mode (SHDN bit = 0 in Access Control Register), the ISL23318WFUZ-TK opens the RH–RL path and internally connects RW to RL via a ~2kΩ resistor. This prevents floating outputs while maintaining circuit continuity - critical for fail-safe bias networks. All WR register contents are preserved, and wiper returns to prior position within 1.5µs after exit. The ISL23318WFUZ-TK draws <2.8µA in this state.

What is the maximum recommended wiper current for the ISL23318WFUZ-TK?

The ISL23318WFUZ-TK specifies a maximum continuous wiper current (IW) of ±3mA under recommended operating conditions (VCC = 1.7V–5.5V). Exceeding this may cause localized heating, accelerated resistor drift, or long-term degradation of wiper switch reliability. For pulsed operation, the absolute maximum rating is ±6mA for ≤10 seconds - but sustained use above ±3mA is not advised. This limit applies directly to the ISL23318WFUZ-TK regardless of package or resistance option.

Can multiple ISL23318WFUZ-TK devices share the same I²C bus?

Yes - the ISL23318WFUZ-TK supports up to four devices on a single I²C bus using its two hardware address pins (A0, A1), which configure the two LSBs of the 7-bit slave address. Each device must have unique A0/A1 logic states (GND or VLOGIC) to avoid address collision. The ISL23318WFUZ-TK's 400kHz maximum SCL frequency and 10pF pin capacitance ensure reliable multi-drop operation without bus loading issues.