Renesas X9318WP8

Overview

X9318WP8 from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 10 kΩ end-to-end resistance solid-state resistor array with 100 wiper tap points, 3-wire serial interface (CS/U/D/INC), nonvolatile wiper position storage, and operation from 4.5V to 5.5V supply. It serves as a precision voltage divider or two-terminal variable resistor in analog trim applications requiring power-up repeatability.

For engineers reviewing the X9318WP8 datasheet, X9318WP8 pinout, X9318WP8 application, or X9318WP8 equivalent, key selection considerations include its ±20% RTOTAL tolerance, 40–200 Ω wiper resistance, 100-year data retention, 100,000-cycle endurance, and compatibility with 0–8 V terminal voltage ranges in LCD bias, laser diode control, and regulator output adjustment circuits.

Technical Context

The X9318WP8 integrates a 99-element temperature-compensated resistor ladder, a 7-bit up/down counter, make-before-break wiper switching, and EEPROM-based nonvolatile memory for wiper position recall. Its control logic responds to negative-edge-triggered INC pulses while U/D sets direction and CS enables selection or initiates store-on-high transitions.

It operates as a true three-terminal potentiometer (RH/RW/RL) or two-terminal variable resistor (e.g., RH–RW or RW–RL), with ratiometric temperature coefficient of ±20 ppm/°C and absolute linearity of ±1% MI. Wiper movement is bounded-no wraparound-and stable within 500 µs after power-up.

Key Specifications

Pinout & Package

Package: 8-lead plastic DIP (PDIP), 0.300" wide, RoHS-compliant (Pb-free plus anneal).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5243BRMZ10 and MCP41010-I/P, the X9318WP8 offers unique advantages in self-contained operation: no external controller needed for power-up restoration, minimal 3-wire control overhead, and guaranteed 100-year setting retention-making it optimal for maintenance-free analog trim in industrial and embedded systems.

Availability

X9318WP8 is available at Aetrix Electronics and suitable for LCD bias control, laser diode current regulation, and voltage regulator output trimming requiring stable component supply, long-term calibration integrity, and through-hole manufacturability.

Supply support for X9318WP8 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 semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.

The X9318WP8 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimpots in analog calibration, bias control, and feedback loop adjustment applications where reliability, repeatability, and nonvolatile setting retention are essential.

FAQ

What is the operating temperature range for the X9318WP8?

The X9318WP8 is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with its 8-lead PDIP packaging and targets applications such as consumer displays, industrial HMI panels, and board-level power supplies where extended industrial temperature is not required. The device maintains its ±20% RTOTAL tolerance and ±1% absolute linearity across this full range.

Does the X9318WP8 require an external clock or microcontroller to function?

No, the X9318WP8 operates autonomously using only three digital control lines: CS, U/D, and INC. It contains an internal 7-bit up/down counter and nonvolatile memory-no external clock source or firmware is needed. A simple push-button or GPIO-driven pulse train suffices to adjust and store the wiper position, making the X9318WP8 ideal for standalone analog trim without processor dependency.

How is wiper position stored and recalled in the X9318WP8?

Wiper position is stored in on-chip EEPROM when CS transitions HIGH while INC is held HIGH. Upon subsequent power-up, the X9318WP8 automatically recalls that stored value and configures the wiper within 500 µs. This behavior is intrinsic to the X9318WP8 design-no initialization sequence or host command is required, ensuring repeatable analog performance across power cycles.

Can the X9318WP8 be used with supply voltages other than 5 V?

The X9318WP8 is characterized for VCC = 4.5 V to 5.5 V and must operate within this range. While absolute maximum ratings allow VCC up to +7 V, functional operation outside 4.5–5.5 V is not guaranteed. Its internal logic thresholds, current consumption, and wiper timing (e.g., tCYC = 4 µs) are validated only within the specified 5 V ±10% window-using other voltages may compromise reliability or specification compliance of the X9318WP8.

What is the maximum allowable voltage across RH and RL terminals of the X9318WP8?

The X9318WP8 supports a maximum terminal voltage of +8 V between RH and RL, referenced to VSS. This rating applies under normal operating conditions-not absolute maximum stress limits-and enables direct use in 5 V and 8 V analog rails without external clamping. Exceeding +8 V risks violating the specified VRH/RL parameter and may degrade long-term linearity or accelerate EEPROM wear in the X9318WP8.