Renesas X9315USZ

Overview

X9315USZ from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 31-element resistor array with 32 wiper tap points, nonvolatile wiper position storage, and 3-wire serial interface (CS/U/D/INC). It operates at 5V ±10%, delivers 10kΩ end-to-end resistance, supports 0°C to +70°C commercial temperature range, and functions as a three-terminal voltage divider or two-terminal variable resistor in analog signal conditioning circuits.

For engineers reviewing the X9315USZ datasheet, X9315USZ pinout, X9315USZ application, or X9315USZ equivalent, this device is selected for precision analog trimming where power-up repeatability, low 5µA standby current, and solid-state reliability replace mechanical potentiometers in industrial control loops, sensor calibration, and programmable gain stages.

Technical Context

The X9315USZ integrates a 5-bit up/down counter, nonvolatile EEPROM for wiper position retention, and a decoder-driven switching network across 31 resistive elements. Its "make-before-break" wiper switching prevents open-circuit transients during tap transitions.

Control logic responds to negative-edge-triggered INC input with direction set by U/D level while CS enables selection and initiates nonvolatile store on CS↑ with INC HIGH. Wiper terminal resistance is 200Ω typical at VCC = 5V, and terminal voltage range spans 0 to VCC with no external bias required.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free), RoHS compliant, JEDEC MS-012-AA footprint (M8.15).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP41010-I/P, the X9315USZ offers guaranteed power-up repeatability via integrated nonvolatile memory and simpler 3-wire control-critical for single-pot applications where minimizing MCU overhead and ensuring deterministic startup behavior are design priorities.

Availability

X9315USZ is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifiers, LCD contrast control, and audio volume trim requiring stable component supply with RoHS-compliant packaging and commercial temperature range support.

Supply support for X9315USZ 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 focused on power management, precision analog, and interface solutions.

The X9315USZ belongs to Intersil's XDCP™ (Digitally Controlled Potentiometer) product line, engineered to replace electromechanical potentiometers in applications demanding long-term stability, programmability, and nonvolatile setting retention.

FAQ

What is the supply voltage range for the X9315USZ?

The X9315USZ operates within a supply voltage range of 4.5V to 5.5V, corresponding to 5V ±10%. This specification is defined in the Recommended Operating Conditions table of the FN8179 datasheet. Operation outside this range may compromise wiper positioning accuracy, nonvolatile store functionality, or device reliability. The X9315USZ is not rated for 2.7V operation-variants with "-2.7" suffix (e.g., X9315USZ-2.7) support wider 2.7–5.5V range, but the X9315USZ itself is strictly 5V-compatible.

Does the X9315USZ retain its wiper position after power cycling?

Yes, the X9315USZ retains its last stored wiper position in nonvolatile EEPROM memory and automatically recalls it on power-up. This behavior is guaranteed by the device architecture: wiper position is written to memory only when CS transitions HIGH while INC is HIGH, and recall occurs transparently during power-on reset. The datasheet specifies 100-year data retention and 100,000 write cycles, making the X9315USZ suitable for applications requiring deterministic startup without host intervention.

What is the pin configuration and package type of the X9315USZ?

The X9315USZ uses an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, drawing M8.15), Pb-free and RoHS compliant. Pin 1 is RH/VH, followed clockwise by RW/VW (pin 2), RL/VL (pin 3), VSS (pin 4), VCC (pin 5), U/D (pin 6), INC (pin 7), and CS (pin 8). This matches the standard SOIC-8 pinout shown in Figure 1 of the FN8179 datasheet and is compatible with industry-standard SOIC footprints.

How does the 3-wire interface of the X9315USZ work?

The X9315USZ uses CS (chip select), U/D (up/down), and INC (increment) signals-no clock or data lines. With CS LOW, each negative edge on INC moves the wiper one tap in the direction set by U/D (HIGH = increment, LOW = decrement). A store to nonvolatile memory occurs on CS rising edge while INC is HIGH. This minimal interface reduces MCU GPIO usage and simplifies firmware versus SPI/I²C alternatives, and the X9315USZ datasheet confirms timing parameters including tIW (INC to VW change) of 1–5µs.

What is the end-to-end resistance tolerance and temperature coefficient of the X9315USZ?

The X9315USZ has a nominal end-to-end resistance of 10kΩ with a tolerance of ±20%, and a total resistance temperature coefficient of ±300 ppm/°C. These values are specified in the Potentiometer Characteristics table (page 6) of the FN8179 datasheet. The ratiometric temperature coefficient is tighter at ±20 ppm/°C, meaning the voltage division ratio remains highly stable across temperature-critical for precision reference and sensor scaling applications using the X9315USZ.