Renesas X9317US8-2.7

Overview

X9317US8-2.7 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) with 100 wiper tap points, nonvolatile wiper position storage, and 50 kΩ end-to-end resistance. It operates from 2.7 V to 5.5 V, consumes <5 µA standby current, and uses a 3-wire up/down interface for voltage divider or variable resistor applications in precision analog trimming.

For engineers reviewing the X9317US8-2.7 datasheet, X9317US8-2.7 pinout, X9317US8-2.7 application, or X9317US8-2.7 equivalent, this device supports DC bias adjustment, laser diode bias control, gain/offset trim, and voltage regulator output tuning - all requiring stable, nonvolatile resistance setting with low noise (–120 dBV) and ±1% absolute linearity.

Technical Context

The X9317US8-2.7 implements a 99-element resistor array with make-before-break wiper switching, enabling glitch-free transitions between 100 discrete tap positions. Its 7-bit counter is controlled via CS, U/D, and edge-triggered INC inputs, and wiper state is retained in nonvolatile memory for automatic recall at power-up.

It features temperature-compensated resistance (±300 ppm/°C total coefficient, ±20 ppm/°C ratiometric), 200 Ω typical wiper resistance at 5 V (400–1000 Ω at 2.7 V), and supports both three-terminal potentiometer and two-terminal rheostat configurations with RH, RL, and RW terminals.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (M8.15E), RoHS-compliant, commercial temperature range (0°C to +70°C).

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 X9317US8-2.7 offers guaranteed nonvolatile recall, simpler 3-wire control, and tighter ratiometric tempco (±20 ppm/°C), making it optimal for single-channel, power-cycle-critical analog biasing where minimal GPIO overhead matters.

Availability

X9317US8-2.7 is available at Aetrix Electronics and suitable for LCD bias control, laser diode biasing, and voltage regulator output tuning requiring stable component supply, long-term calibration retention, and low-power operation in commercial-temperature environments.

Supply support for X9317US8-2.7 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT applications.

The X9317US8-2.7 belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for high-reliability, nonvolatile analog trimming in space-constrained, low-power systems where mechanical potentiometers fail.

FAQ

What is the maximum wiper current rating for X9317US8-2.7 at 2.7 V supply?

The X9317US8-2.7 supports ±4.4 mA wiper current (IW) across its full operating range. At 2.7 V, wiper resistance rises to 400–1000 Ω depending on tap position, limiting continuous current to ensure power dissipation stays below 10 mW - critical for stable operation in laser diode bias and precision reference circuits where thermal drift must be minimized.

Does X9317US8-2.7 require external pull-up resistors on CS, U/D, or INC pins?

No, X9317US8-2.7 does not require external pull-ups: its CS, U/D, and INC inputs have ±10 µA leakage current and defined VIH/VIL thresholds (VCC × 0.7 and VCC × 0.1). Internal logic interprets floating inputs as indeterminate; however, robust designs should actively drive these lines or use weak (≥100 kΩ) external pulls to prevent unintended wiper movement during power-up or noise events.

How is nonvolatile storage triggered on X9317US8-2.7?

Nonvolatile storage on X9317US8-2.7 occurs automatically when CS transitions from LOW to HIGH while INC is held HIGH - a 5–10 ms store cycle begins, placing the device in standby mode upon completion. This sequence preserves the current wiper position across power cycles; no external command or timing controller is needed beyond correct signal sequencing per the datasheet's Mode Selection table.

Can X9317US8-2.7 operate as a two-terminal variable resistor?

Yes, X9317US8-2.7 can operate as a two-terminal variable resistor by connecting RH and RW (or RL and RW) externally and leaving the third terminal open or grounded. In this configuration, it functions as a digitally adjustable rheostat with 50 kΩ nominal resistance and 100-step resolution - commonly used in current-setting paths for LED drivers, laser diode bias, and programmable gain amplifiers.

What is the power-up behavior of X9317US8-2.7 regarding wiper position?

On power-up, X9317US8-2.7 automatically recalls the last wiper position stored in nonvolatile memory within 5 µs after VCC stabilizes. The device remains inactive until CS is asserted, preventing spurious movement; however, proper power sequencing (VCC/VSS applied before RH/RL/RW voltages) is required to avoid latch-up or undefined states per the datasheet's Power-up and Down Requirements section.