Renesas X9319WS8IZ

Overview

X9319WS8IZ from Intersil is a digitally controlled potentiometer (XDCP™) with 10 kΩ end-to-end resistance, 100 wiper tap points, and nonvolatile memory for power-up recall. It operates from 4.5–5.5 V, supports 0–10 V terminal voltage, and functions as either a three-terminal voltage divider or two-terminal variable resistor in precision analog trimming applications.

For engineers reviewing the X9319WS8IZ datasheet, X9319WS8IZ pinout, X9319WS8IZ application, or X9319WS8IZ equivalent, this device delivers deterministic wiper positioning via 3-wire serial interface (CS/U/D/INC), temperature-compensated linearity (±1% absolute), and industrial-grade operation from –40°C to +85°C in an 8-lead SOIC package.

Technical Context

The X9319WS8IZ implements a 99-element resistor array with make-before-break wiper switching, enabling glitch-free transitions between 100 discrete tap positions. Its 7-bit up/down counter drives a decoder that selects one of 100 wiper terminals, with position stored in nonvolatile memory upon CS↑ while INC = HIGH.

Control logic responds to negative-edge-triggered INC pulses synchronized with U/D level, requiring tCYC ≥ 4 µs and tIW ≤ 500 µs for wiper settling. The device maintains ratiometric temperature coefficient (±20 ppm/°C) and absolute linearity (±1 MI) across its full operating range.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (150 mil), RoHS-compliant, M8.15E outline, body size 4.90 × 3.90 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5241BRMZ10 and MCP41010-I/P, the X9319WS8IZ uniquely combines 100-tap resolution, guaranteed nonvolatile power-up recall, and 3-wire interface simplicity-enabling self-contained analog trimming without host intervention or external memory.

Availability

X9319WS8IZ is available at Aetrix Electronics and suitable for LCD bias control, laser diode current regulation, and voltage regulator feedback networks requiring stable component supply across industrial temperature ranges.

Supply support for X9319WS8IZ 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

Intersil Corporation, now part of Renesas Electronics, designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9319WS8IZ belongs to Intersil's XDCP™ family of digitally controlled potentiometers, engineered for replacing mechanical trimpots in industrial, telecom, and instrumentation systems where reliability, repeatability, and nonvolatile setting retention are essential.

FAQ

What is the operating temperature range for the X9319WS8IZ?

The X9319WS8IZ is rated for industrial operation from –40°C to +85°C. This range is fully characterized and guaranteed for all electrical parameters including end-to-end resistance tolerance (±20%), absolute linearity (±1%), and nonvolatile memory retention. No derating is required within this span, making X9319WS8IZ suitable for harsh-environment applications such as base station power supplies and automotive infotainment displays.

Does the X9319WS8IZ require an external microcontroller to retain its wiper position after power loss?

No. The X9319WS8IZ contains on-chip nonvolatile memory that automatically stores the wiper position when CS is raised high with INC held high. Upon subsequent power-up, the device recalls that stored position without any external intervention. This autonomous behavior distinguishes X9319WS8IZ from volatile digital potentiometers like the MCP41010-I/P and eliminates dependency on host firmware for calibration persistence.

How does the 3-wire interface of the X9319WS8IZ differ from I²C or SPI protocols?

The X9319WS8IZ uses a dedicated 3-wire interface (CS, U/D, INC) with no protocol overhead-each INC falling edge increments or decrements the wiper based solely on the U/D logic level. Unlike I²C or SPI, it requires no address bytes, command codes, or clock stretching. This simplifies implementation on resource-constrained GPIOs and avoids bus arbitration issues, making X9319WS8IZ ideal for direct connection to simple logic controllers or discrete pushbutton circuits.

Can the X9319WS8IZ be used in a two-terminal variable resistor configuration?

Yes. The X9319WS8IZ supports both three-terminal potentiometer (RH–RW–RL) and two-terminal variable resistor (e.g., RW–RL or RW–RH) configurations. In two-terminal mode, it functions as a digitally adjustable current-limiting or gain-setting element. The datasheet confirms 0–10 V terminal voltage capability and specifies wiper current limits (±3 mA), ensuring safe operation in current-sense feedback paths such as laser diode bias control-where X9319WS8IZ is explicitly cited as applicable.

What is the maximum allowable voltage on the RH, RL, and RW terminals of the X9319WS8IZ?

The absolute maximum voltage on RH, RL, and RW terminals is +12 V with respect to VSS, but the recommended operating range is 0 to +10 V. This 10 V limit aligns with the device's specified terminal voltage (VRH/RL) parameter and ensures compliance with internal switch ratings and linearity performance. Exceeding +10 V may degrade absolute linearity or accelerate wear; thus, X9319WS8IZ is optimized for use in 5 V and 10 V single-supply analog systems-not high-voltage industrial controls.