Renesas X9319US8

Overview

X9319US8 from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 10 kΩ end-to-end resistance with 100 wiper tap points, 3-wire serial interface (CS/U/D/INC), and nonvolatile memory for power-up recall. It functions as a solid-state three-terminal voltage divider or two-terminal variable resistor in precision analog trimming circuits.

For engineers reviewing the X9319US8 datasheet, X9319US8 pinout, X9319US8 application, or X9319US8 equivalent, key selection criteria include its ±20% RTOTAL tolerance, 40–200 Ω wiper resistance, 100k-cycle endurance, 100-year data retention, and compatibility with 0–10 V terminal voltage operation across -40°C to +85°C.

Technical Context

The X9319US8 integrates a 99-element resistor array with make-before-break wiper switching, a 7-bit up/down counter, and EEPROM-based nonvolatile storage. Wiper position is updated on negative-edge transitions of INC while CS is asserted low, with direction controlled by U/D logic level.

It operates exclusively from a single 4.5–5.5 V supply, draws ≤3 mA active current and ≤1 mA standby current, and supports ratiometric temperature coefficient of ±20 ppm/°C - critical for stable gain/offset trim under thermal variation.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (150 mil), Pb-free (RoHS compliant), JEDEC MS-012 outline M8.15E.

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 X9319US8 uniquely combines 3-wire simplicity, guaranteed power-up recall, and 100k-cycle reliability-making it optimal for unattended embedded systems requiring deterministic analog behavior after cold start.

Availability

X9319US8 is available at Aetrix Electronics and suitable for LCD bias control, laser diode biasing, voltage regulator trimming, and precision DC offset adjustment requiring stable component supply across industrial and telecom equipment lifecycles.

Supply support for X9319US8 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 X9319US8 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, engineered for replacement of mechanical trimmers in systems demanding long-term stability, programmability, and nonvolatile calibration storage.

FAQ

What is the maximum terminal voltage rating for the X9319US8?

The X9319US8 supports RH and RL terminal voltages from 0 V to +10 V relative to VSS. Exceeding +10 V may damage the internal switches or resistor array. This rating applies across the full -40°C to +85°C operating range and enables direct use with common analog reference rails without external attenuation or clamping.

Does the X9319US8 require an external microcontroller to retain wiper position after power cycling?

No. The X9319US8 stores the current wiper position in on-chip nonvolatile memory and automatically recalls it upon power-up. No external controller or initialization sequence is needed-this behavior is intrinsic to the device architecture and requires only proper CS/INC timing during store operations.

Can the X9319US8 be used in a two-terminal variable resistor configuration?

Yes. The X9319US8 supports two-terminal operation by connecting either RH or RL to RW (wiper), effectively using the array as a digitally adjustable rheostat. This configuration is commonly used for current limit setting in laser diode drivers or LED bias circuits, with RW serving as the adjustable terminal.

What is the wiper resistance specification for the X9319US8, and why does it matter?

The X9319US8 has a wiper resistance of 40–200 Ω. This series resistance directly adds to the effective output impedance when RW is used as a signal source. In high-precision voltage dividers or low-impedance feedback paths, it introduces loading error-requiring buffer amplification or compensation in sensitive applications like offset trim.

How does the X9319US8 handle rapid wiper position changes across multiple taps?

The X9319US8 uses make-before-break switching: during multi-step wiper movement, adjacent taps are briefly shorted together before disconnecting the prior tap. This prevents open-circuit transients but temporarily reduces effective RTOTAL. Designers must allow ≥500 µs settling time (tPU) after final INC edge before sampling RW for stable output.