Renesas X9317US8

Overview

X9317US8 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 voltage regulator control circuits.

For engineers reviewing the X9317US8 datasheet, X9317US8 pinout, X9317US8 application, or X9317US8 equivalent, key selection criteria include end-to-end resistance tolerance (±20%), wiper resistance (200–400 Ω at 5 V), standby current (<5 µA), nonvolatile store timing (5–10 ms), and SOIC-8 package compatibility with commercial temperature range (0°C to +70°C).

Technical Context

The X9317US8 uses a 7-bit up/down counter decoded to select one of 100 wiper positions across a temperature-compensated resistor array. Wiper movement follows make-before-break switching, preventing open-circuit transients during position changes.

Control is implemented via three dedicated digital inputs: CS (chip select, active-low), U/D (direction control), and INC (negative-edge-triggered increment). Nonvolatile storage occurs on CS rising edge while INC is high, enabling power-up recall of last stored position without external memory.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body 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 AD5204BRZ10 and MCP41010-I/P, the X9317US8 offers simpler 3-wire control, guaranteed power-up recall without firmware intervention, and higher RTOTAL (50 kΩ) suited for high-impedance feedback networks-making it optimal for single-channel, set-and-forget analog trimming.

Availability

X9317US8 is available at Aetrix Electronics and suitable for LCD bias control, DC bias adjustment, and voltage regulator output control requiring stable component supply, long-term calibration retention, and commercial-temperature SOIC packaging.

Supply support for X9317US8 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 manufacturer specializing in microcontrollers, analog power, and mixed-signal solutions for automotive, industrial, and infrastructure markets.

The X9317 series belongs to Renesas' XDCP™ digitally controlled potentiometer product line, designed specifically for replacing mechanical trimmers in precision analog calibration, bias control, and feedback loop adjustment applications.

FAQ

What is the maximum wiper current rating for the X9317US8?

The X9317US8 supports a maximum wiper current (IW) of ±4.4 mA under specified test conditions. This limit ensures safe operation without exceeding power dissipation or causing irreversible resistance drift. Exceeding this value may degrade wiper switch reliability or alter RTOTAL stability. The X9317US8 datasheet specifies this absolute maximum in the "Potentiometer Specifications" table on page 4.

Does the X9317US8 retain its wiper position after power cycling?

Yes, the X9317US8 retains its wiper position after power cycling because it stores the last programmed value in nonvolatile memory. Upon power-up, the device automatically recalls that stored position and sets the wiper accordingly. This behavior is guaranteed across the commercial temperature range (0°C to +70°C) and requires no external components or firmware initialization. The X9317US8 achieves this using EEPROM-like memory cells rated for 100,000 write cycles and 100-year data retention.

Can the X9317US8 operate from a 3.3 V supply?

No, the X9317US8 is not rated for 3.3 V operation. Its specified VCC range is 4.5 V to 5.5 V, as confirmed in the "Potentiometer Specifications" table on page 4 of the datasheet. Attempting to power the X9317US8 from 3.3 V will result in undefined logic behavior, unreliable wiper positioning, and failure to execute nonvolatile store operations. For 3.3 V systems, consider the X9317US8-2.7 variant, which supports 2.7–5.5 V operation.

What is the wiper resistance of the X9317US8 at 5 V supply?

The wiper resistance (RW) of the X9317US8 is specified as 200 Ω typical and 400 Ω maximum at VCC = 5 V, per the "Potentiometer Specifications" table on page 4. This low on-resistance minimizes insertion loss and voltage error in precision voltage divider configurations. At lower supply voltages (e.g., 2.7 V), RW increases to 1000 Ω max due to reduced drive strength in the internal CMOS switches.

How does the X9317US8 handle rapid wiper position changes across multiple taps?

The X9317US8 uses make-before-break switching during wiper transitions, meaning multiple adjacent taps connect briefly to RW during multi-step moves. This prevents open-circuit transients but temporarily reduces effective RTOTAL. The duration of overlap is bounded by tIW (INC to RW change), specified as 1–5 µs. Designers must account for this transient impedance drop in time-critical feedback paths, especially when stepping >5 taps consecutively. The X9317US8 datasheet details this behavior in the "Principles of Operation" section on page 8.