Renesas X9317UM8

Overview

X9317UM8 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with 100 wiper tap points, nonvolatile wiper position storage, and 3-wire up/down serial interface. It functions as a three-terminal voltage divider or two-terminal variable resistor for precision bias and trim in analog signal paths. Typical use includes LCD bias control and laser diode current regulation under 2.7V to 5.5V supply.

For engineers reviewing the X9317UM8 datasheet, X9317UM8 pinout, X9317UM8 application, or X9317UM8 equivalent, key selection criteria include end-to-end resistance tolerance (±20%), wiper resistance (200Ω typ. at 5V), nonvolatile store timing (5–10 ms), ratiometric temperature coefficient (±20 ppm/°C), and MSOP-8 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The X9317UM8 integrates a 7-bit up/down counter, decoder, and solid-state wiper switching network that connects one of 100 tap points to RW. Wiper movement is edge-triggered via INC with direction controlled by U/D, and CS enables selection and initiates nonvolatile store on rising edge when INC is high.

Its resistor array delivers ±1% absolute linearity and ±0.2% relative linearity across 0–99 taps, with temperature-compensated RTOTAL (±300 ppm/°C total coefficient) and ratiometric stability (±20 ppm/°C). The device operates in standby mode drawing <5 µA and supports 100,000 write cycles with 100-year data retention.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (RoHS-compliant, JEDEC MO-187-AA compliant, body size 3.0 mm × 3.0 mm × 0.85 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5175BRMZ-50 and MCP45HV51-503, the X9317UM8 offers superior ratiometric temperature stability (±20 ppm/°C vs. 50–100 ppm/°C) and deterministic 3-wire timing-critical for deterministic analog trimming in industrial control loops where I²C arbitration delay or voltage margin constraints are unacceptable.

Availability

X9317UM8 is available at Aetrix Electronics and suitable for LCD bias control, laser diode biasing, and voltage regulator output trimming requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.

Supply support for X9317UM8 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 infrastructure markets.

The X9317UM8 belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimpots in high-reliability analog trimming applications where nonvolatile storage, temperature stability, and low-power operation are essential.

FAQ

What is the operating voltage range for the X9317UM8?

The X9317UM8 operates from 2.7 V to 5.5 V, supporting both 3.3 V and 5 V systems. This wide VCC range enables direct integration into mixed-supply designs without level-shifting. The device maintains full functionality-including wiper movement, nonvolatile store, and linearity specs-across this entire range. At 2.7 V, wiper resistance rises to 400 Ω (max), which should be accounted for in low-impedance feedback paths. The X9317UM8 datasheet specifies ICC1 active current ≤80 µA and ISB standby current ≤5 µA under these conditions.

Does the X9317UM8 retain its wiper position after power loss?

Yes, the X9317UM8 stores the current wiper position in nonvolatile memory and automatically recalls it on power-up. This recall occurs within 5 µs after VCC stabilizes, ensuring immediate operational readiness. The store operation is triggered by a rising edge on CS while INC is held high, completing in 5–10 ms. Data retention is rated for 100 years, and endurance is specified at 100,000 store cycles-making the X9317UM8 suitable for factory-trimmed, maintenance-free deployments where recalibration is impractical.

How does the X9317UM8 interface with a microcontroller?

The X9317UM8 uses a simple 3-wire up/down serial interface: CS (chip select), U/D (direction), and INC (increment clock). No clock or data lines are required-toggling INC while CS is low moves the wiper up or down based on U/D logic level. This minimizes GPIO usage and eliminates protocol overhead. The interface is fully static; timing parameters like tCYC (2 µs min) and tIW (1–5 µs wiper settle) are compatible with standard MCU GPIO toggling. No firmware driver is needed beyond basic pin control, unlike I²C or SPI DCPs.

What is the package type and footprint compatibility of the X9317UM8?

The X9317UM8 is supplied in an 8-lead MSOP package (JEDEC MO-187-AA, pkg drawing M8.118), measuring 3.0 mm × 3.0 mm × 0.85 mm. Its pinout matches industry-standard MSOP-8 layouts, including compatible land patterns from Renesas' recommended footprint. It shares identical pin assignments with X9317WM8IZ and other MSOP variants in the X9317 family, enabling drop-in replacement within the same package variant. Thermal resistance is θJA = 145 °C/W (typical), requiring minimal PCB copper for thermal management in most applications.

Can the X9317UM8 be used as a two-terminal variable resistor?

Yes, the X9317UM8 can operate as a two-terminal variable resistor by connecting either RH or RL to RW (wiper), leaving the unused terminal open or grounded depending on topology. In this mode, resistance between RW and the selected fixed terminal varies from near-zero (tap 0 or 99) to RTOTAL (50 kΩ). Wiper resistance (200 Ω typ.) adds in series and must be included in total resistance calculations. The device retains its nonvolatile store and temperature-stable ratiometric behavior-making it suitable for current-setting applications such as laser diode bias or LED current control where precision and repeatability are required.