Renesas X9317UV8I

Overview

X9317UV8I 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 functions as a three-terminal voltage divider or two-terminal variable resistor for precision analog trimming in DC bias, gain/offset, and laser diode control circuits.

For engineers reviewing the X9317UV8I datasheet, X9317UV8I pinout, X9317UV8I application, or X9317UV8I equivalent, this device delivers low-noise (–120 dBV), temperature-compensated resistance (±300 ppm/°C), <5 µA standby current, and RoHS-compliant TSSOP-8 packaging suitable for industrial-grade embedded trimming.

Technical Context

The X9317UV8I 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 the resistor array exhibits ratiometric temperature coefficient of ±20 ppm/°C - critical for stable voltage division under thermal drift.

Operation relies on three digital inputs: CS (active-low chip select), U/D (direction control), and INC (negative-edge-triggered increment). Wiper position is stored to nonvolatile memory only when CS rises while INC is high, enabling deterministic power-up recall without unintended writes.

Key Specifications

Pinout & Package

Package: 8-lead TSSOP (RoHS-compliant, JEDEC MO-153 AC, M8.173 drawing), 4.4 mm × 3.0 mm footprint, 1.2 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5243BRMZ50 and MCP41050-I/P, the X9317UV8I provides guaranteed power-up repeatability via nonvolatile storage, simpler 3-wire control (no address or command bytes), and tighter ratiometric temperature coefficient - making it optimal for unattended calibration in industrial power supplies and optical modules.

Availability

X9317UV8I is available at Aetrix Electronics and suitable for LCD bias control, laser diode biasing, voltage regulator trimming, and precision DC offset adjustment requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9317UV8I 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 X9317 series was designed specifically for solid-state replacement of mechanical potentiometers in analog trimming applications where reliability, nonvolatility, and temperature stability are critical - targeting industrial instrumentation, optical networking, and display electronics.

FAQ

What is the power-up behavior of the X9317UV8I?

The X9317UV8I automatically recalls the last wiper position stored in nonvolatile memory upon power-up, ensuring repeatable analog settings without host intervention. This behavior is guaranteed across the full –40°C to +85°C operating range and requires no external initialization sequence. The wiper becomes stable within 5 µs after VCC reaches its final value, as specified in the FN8183 Rev.10.01 datasheet for X9317UV8I.

Does the X9317UV8I require external decoupling capacitors?

Yes, a 0.1 µF ceramic capacitor placed close to the VCC and VSS pins is recommended to suppress high-frequency noise and ensure stable operation during wiper transitions. The X9317UV8I's internal CMOS logic and resistor array are sensitive to supply ripple, and insufficient decoupling may cause erratic wiper movement or failed nonvolatile stores. This requirement is documented in the "Power-up and Down Requirements" section of the X9317UV8I datasheet.

Can the X9317UV8I be used in a 2.7 V system?

Yes, the X9317UV8I operates across 2.7 V to 5.5 V, making it fully compatible with 2.7 V systems. At 2.7 V, wiper resistance increases to ≤1000 Ω (vs. ≤400 Ω at 5 V), and active supply current remains below 80 µA. All timing parameters - including tCYC (2 µs min) and tIW (1–5 µs) - remain valid across the full voltage range, as confirmed in the DC and AC Electrical Specifications tables for X9317UV8I.

How is nonvolatile storage triggered on the X9317UV8I?

Nonvolatile storage is triggered by a rising edge on the CS pin while the INC pin is held HIGH. This specific condition - CS transitioning from LOW to HIGH with INC = HIGH - initiates a 5–10 ms internal write cycle to EEPROM. During this time, the device enters standby mode and ignores further INC or U/D activity. The procedure is explicitly defined in the "Instructions and Programming" section of the X9317UV8I datasheet and is not activated by power cycling alone.

What is the maximum allowable voltage across RH and RL terminals of the X9317UV8I?

The absolute maximum voltage across RH and RL is +6 V, as specified in the Absolute Maximum Ratings table. However, for reliable operation within datasheet limits, the voltage difference must remain within the supply rails: VRH/RL must stay between VSS and VCC (i.e., 0 V to 5.5 V). Exceeding VCC risks latch-up or permanent damage, and operation above 5.5 V voids the 100-year data retention guarantee for X9317UV8I's nonvolatile memory.