Renesas X9319US8I

Overview

X9319US8I from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 10 kΩ end-to-end resistance with 100 wiper tap points, nonvolatile wiper position storage, and 3-wire serial interface (CS/U/D/INC). It functions as a solid-state replacement for mechanical potentiometers in precision analog trimming circuits requiring power-up recall and ±20% RTOTAL tolerance.

For engineers reviewing the X9319US8I datasheet, X9319US8I pinout, X9319US8I application, or X9319US8I equivalent, key selection considerations include its 5V CMOS-compatible control logic, 40–200 Ω wiper resistance, ±3 mA wiper current rating, -40°C to +85°C industrial temperature range, and SOIC-8 package compatibility with standard PCB layouts for analog bias and gain adjustment.

Technical Context

The X9319US8I integrates a 99-element resistor array with make-before-break wiper switching, a 7-bit up/down counter, and nonvolatile memory for wiper position retention. Its control logic responds to negative-edge-triggered INC pulses while U/D sets direction and CS enables selection or initiates nonvolatile store on CS↑ with INC HIGH.

It operates as either a three-terminal voltage divider (RH–RW–RL) or two-terminal variable resistor (RW–RL or RW–RH), supporting terminal voltages from 0 V to +10 V. Temperature-compensated ratiometric performance ensures stable voltage division across -40°C to +85°C, with ±0.2 MI relative linearity and ±300 ppm/°C RTOTAL tempco.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (150 mil, M8.15E), Pb-free/RoHS compliant, moisture sensitivity level per JEDEC J-STD-020.

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 X9319US8I provides guaranteed power-up wiper recall and simpler 3-wire control-reducing firmware overhead and eliminating external memory for calibration storage in standalone analog subsystems.

Availability

X9319US8I is available at Aetrix Electronics and suitable for LCD bias control, laser diode biasing, and voltage regulator output trimming requiring stable component supply, long-term calibration retention, and industrial temperature operation.

Supply support for X9319US8I 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) is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9319US8I belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in industrial, medical, and communications equipment where reliability, recalibration stability, and board space savings are critical.

FAQ

What is the operating voltage range for the X9319US8I?

The X9319US8I operates from 4.5 V to 5.5 V on VCC, with absolute maximum ratings allowing up to +7 V on digital inputs relative to VSS. Terminal voltages (RH, RL, RW) are rated from 0 V to +10 V, enabling use in both 5 V and 10 V analog signal paths without level-shifting. This makes the X9319US8I suitable for direct integration into unbuffered voltage divider networks across multiple supply domains.

Does the X9319US8I retain its wiper position after power loss?

Yes, the X9319US8I stores the wiper position in nonvolatile memory and automatically recalls it on power-up. The device performs this recall within 500 µs after VCC stabilizes. This behavior is inherent to the X9319US8I architecture and requires no external programming or host MCU intervention-making it ideal for applications like LCD bias where consistent startup behavior is mandatory.

How many wiper positions does the X9319US8I support, and what is its resolution?

The X9319US8I supports exactly 100 discrete wiper positions (0 through 99), corresponding to 99 resistive elements in its array. This yields 1% step resolution for full-scale resistance adjustment. Resolution is fixed and deterministic-no interpolation or averaging is performed. Each tap position delivers a defined voltage ratio between RH and RL, enabling repeatable analog trimming without software-based calibration tables.

Can the X9319US8I be used as a two-terminal variable resistor?

Yes, the X9319US8I can operate as a two-terminal variable resistor by connecting either RH or RL to RW and using the remaining terminal with RW as the adjustable element. In this mode, resistance varies from near-zero (wiper at same terminal) to RTOTAL (wiper at opposite terminal). The X9319US8I maintains its ±3 mA wiper current rating and 40–200 Ω wiper resistance in this configuration, supporting current-source trimming in laser diode drivers and LED bias circuits.

What is the maximum wiper current rating for the X9319US8I?

The X9319US8I has a specified wiper current rating of ±3.0 mA, meaning it can sink or source up to 3 mA through the RW terminal without exceeding absolute maximum limits. This rating applies across the full -40°C to +85°C temperature range and is validated under continuous DC conditions. Exceeding this current may cause irreversible resistance drift or wiper contact degradation over time.