Renesas X9317UM8I

Overview

X9317UM8I from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with 100 wiper tap positions, nonvolatile wiper position storage, and 3-wire up/down serial interface. It operates from 2.7V to 5.5V, draws <5µA standby current, and delivers ±20% end-to-end resistance tolerance for precision DC bias adjustment in analog signal paths.

For engineers reviewing the X9317UM8I datasheet, X9317UM8I pinout, X9317UM8I application, or X9317UM8I equivalent, this device supports voltage divider and variable resistor configurations in LCD bias control, laser diode biasing, gain/offset trim, and regulator output tuning - requiring confirmation of RH/RW/RL terminal roles, wiper settling time (≤5µs), and nonvolatile store timing (5–10ms).

Technical Context

The X9317UM8I integrates a 7-bit up/down counter, decoder, and nonvolatile memory to control wiper position across 100 discrete taps. Its "make-before-break" switching ensures continuity during wiper transitions, while temperature-compensated resistor elements deliver ±300 ppm/°C total resistance drift and ±20 ppm/°C ratiometric stability.

Control logic responds to CS (active-low chip select), U/D (direction), and negative-edge-triggered INC signals. Wiper position is stored when CS rises while INC is high, enabling power-up recall without external configuration - critical for unattended embedded systems requiring deterministic startup behavior.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (RoHS-compliant, M8.118 drawing, −40°C to +85°C operating range). Compact 3.0 mm × 3.0 mm footprint with 0.65 mm lead pitch supports high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5241BRMZ10 and MCP41010-I/P, the X9317UM8I uniquely combines nonvolatile wiper retention, 3-wire simplicity, and industrial temperature rating - eliminating boot-time initialization overhead and reducing firmware complexity in standalone analog subsystems.

Availability

X9317UM8I is available at Aetrix Electronics and suitable for LCD bias control, laser diode biasing, voltage regulator output tuning, and instrumentation amplifier gain/offset trimming requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9317UM8I 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 with emphasis on reliability and functional safety.

The X9317UM8I belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical trimpots in analog signal conditioning, power management, and sensor calibration circuits where long-term stability and programmability are essential.

FAQ

What is the guaranteed wiper position retention capability of the X9317UM8I?

The X9317UM8I stores wiper position in nonvolatile memory with 100-year data retention and 100,000 write cycles per bit. This means the X9317UM8I retains its last programmed tap setting across power cycles, shelf storage, and field operation without external backup - critical for calibration-critical systems like medical instruments and test equipment where recalibration is impractical.

Does the X9317UM8I require external pull-up or pull-down resistors on its control pins?

No, the X9317UM8I does not require external pull-up or pull-down resistors on CS, U/D, or INC. Its input leakage current is limited to ±10 µA, and VIH/VIL thresholds are defined relative to VCC (VIH ≥ 0.7×VCC, VIL ≤ 0.1×VCC), allowing direct connection to standard CMOS GPIOs. However, proper PCB layout with short traces and local decoupling remains essential to avoid noise-induced spurious wiper movement in the X9317UM8I.

Can the X9317UM8I be used in a two-terminal variable resistor configuration?

Yes, the X9317UM8I supports two-terminal operation by connecting either RH or RL to RW and using the remaining fixed terminal plus RW as the variable resistance pair. In this mode, the X9317UM8I delivers 0–50 kΩ resistance with 1% step resolution, making it suitable for current-limiting, LED brightness control, and programmable load applications - provided wiper current stays within ±4.4 mA limits specified in the X9317UM8I datasheet.

How does the X9317UM8I handle power-up sequencing to prevent unintended wiper movement?

The X9317UM8I requires CS and INC to be held high before or concurrently with VCC ramp-up to prevent spurious writes or wiper shifts. Its power-up stabilization time is ≤5 µs after VCC reaches final value, but the recommended sequence is: apply VCC/VSS first, then assert control signals. This ensures the X9317UM8I enters known standby state immediately, avoiding erratic behavior during brown-out conditions or slow-ramp supplies.

What is the maximum allowable voltage across RH and RL terminals of the X9317UM8I?

The X9317UM8I specifies RH and RL terminal voltage range as 0 V to VCC, with absolute maximum rating of +6 V relative to VSS. Exceeding VCC risks violating the internal CMOS gate oxide limits and may cause permanent damage. Therefore, the voltage difference between RH and RL must remain ≤VCC - for example, at VCC = 5 V, the maximum RH–RL differential is 5 V. This constraint applies directly to the X9317UM8I's safe operation in high-side sensing or floating bias networks.