Renesas X9319UP8

Overview

X9319UP8 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, supporting voltage divider and variable resistor configurations under 0–10 V terminal voltage and 5 V supply.

For engineers reviewing the X9319UP8 datasheet, X9319UP8 pinout, X9319UP8 application, or X9319UP8 equivalent, key selection criteria include its ±20% RTOTAL tolerance, 40–200 Ω wiper resistance, 100k-cycle endurance, 100-year data retention, and SOIC-8 package compatibility with industrial temperature range operation.

Technical Context

The X9319UP8 integrates a 99-element resistor array with make-before-break wiper switching, a 7-bit up/down counter, and nonvolatile memory for power-up recall. 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 exclusively at VCC = 5 V ±10%, supports terminal voltages up to +10 V (RH/RL), and exhibits ratiometric temperature coefficient of ±20 ppm/°C-critical for stable gain/offset trim across temperature. Wiper movement resolution is 1% with absolute linearity of ±1 MI and relative linearity of ±0.2 MI.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (M8.15E), 3.90 mm × 4.90 mm body, 1.27 mm pitch, RoHS-compliant matte tin finish.

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 X9319UP8 delivers autonomous power-up restoration without host intervention, simpler 3-wire control, and proven 100-year data retention-making it optimal for unattended or safety-critical trimming where reliability and zero-firmware dependency are essential.

Availability

X9319UP8 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 integrity, and industrial temperature operation.

Supply support for X9319UP8 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, communications, and computing markets.

The X9319UP8 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimpots in high-reliability analog trimming applications where nonvolatility, temperature stability, and minimal GPIO overhead are critical.

FAQ

What is the operating temperature range for the X9319UP8?

The X9319UP8 is rated for industrial operation from –40°C to +85°C. This range is validated across all key specifications including end-to-end resistance tolerance (±20%), ratiometric temperature coefficient (±20 ppm/°C), and wiper resistance (40–200 Ω). The device maintains full functionality-including nonvolatile store and recall-within this range, making X9319UP8 suitable for harsh-environment applications such as base station power supplies and automotive display modules.

Does the X9319UP8 require an external clock or microcontroller to operate?

No, the X9319UP8 operates autonomously using only three digital control signals: CS, U/D, and INC. It contains an integrated 7-bit up/down counter and decoder, eliminating the need for external clock sources or firmware-driven communication protocols. The X9319UP8 can be adjusted manually via push-button logic or driven by simple GPIOs-no I²C, SPI, or dedicated controller is required, simplifying design and reducing BOM count.

How does the nonvolatile memory in the X9319UP8 retain wiper position during power loss?

The X9319UP8 uses EEPROM-based nonvolatile memory to store the 7-bit wiper position value. A store operation is triggered when CS transitions HIGH while INC is held HIGH; the value is written and retained for up to 100 years at +25°C. Upon power-up, the stored value is automatically loaded into the counter and applied to the wiper switch network-ensuring X9319UP8 resumes its last calibrated state without host MCU involvement.

Can the X9319UP8 be used in a two-terminal variable resistor configuration?

Yes, the X9319UP8 supports both three-terminal potentiometer (RH–RW–RL) and two-terminal variable resistor (e.g., RH–RW or RW–RL) modes. In two-terminal use, one fixed terminal is left unconnected or tied to RW, enabling current-sensing or gain-setting applications. The 0–10 V terminal voltage rating and 10 kΩ RTOTAL allow direct integration into LM317-style current sources or op-amp feedback networks without additional level-shifting components.

What is the maximum allowable voltage on the RH, RL, and RW terminals of the X9319UP8?

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 limit ensures safe operation of the internal wiper switches and resistor array under all conditions, including transient events. Exceeding +10 V risks increased leakage, reduced linearity, or accelerated wear-so X9319UP8 designs must constrain bias voltages within this window, especially in laser diode or high-voltage regulator feedback applications.