Renesas X9317US8ZT1

Overview

X9317US8ZT1 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 4.5 V to 5.5 V, consumes <5 µA in standby, and features ±1% absolute linearity and ±20 ppm/°C ratiometric temperature coefficient. It serves as a three-terminal voltage divider or two-terminal variable resistor in precision analog trimming applications.

For engineers reviewing the X9317US8ZT1 datasheet, X9317US8ZT1 pinout, X9317US8ZT1 application, or X9317US8ZT1 equivalent, key selection criteria include its SOIC-8 package, 50 kΩ RTOTAL, nonvolatile store-and-recall capability, low 200 Ω typical wiper resistance, and compatibility with 3-wire up/down serial control in DC bias, gain trim, and regulator feedback loop circuits.

Technical Context

The X9317US8ZT1 implements a 99-element resistor array with make-before-break wiper switching, enabling glitch-free tap transitions. Its 7-bit counter drives a decoder that selects one of 100 discrete wiper positions, with position stored in nonvolatile memory upon CS↑/INC↑ edge.

Control logic uses asynchronous 3-wire interface (CS, U/D, INC), where INC toggles on negative edge and U/D determines direction. The device supports both three-terminal potentiometer (RH–RW–RL) and two-terminal rheostat (RW–RL or RW–RH) configurations with full rail-to-rail terminal voltage range (0 V to VCC).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5175BRMZ-50 and MCP41050-I/P, the X9317US8ZT1 uniquely combines 100-tap resolution, true nonvolatile power-up recall, and 3-wire GPIO-compatible control-enabling zero-firmware calibration retention and minimal BOM count in space-constrained analog trimming.

Availability

X9317US8ZT1 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 RoHS-compliant SOIC packaging.

Supply support for X9317US8ZT1 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 timing solutions for automotive, industrial, and IoT applications.

The X9317 series is part of Renesas' XDCP™ family designed specifically for replacing mechanical potentiometers in precision analog trimming, offering nonvolatile storage, low power, and robust temperature performance in compact packages.

FAQ

What is the operating temperature range for the X9317US8ZT1?

The X9317US8ZT1 is rated for 0°C to +70°C commercial operation, as confirmed by the Ordering Information table on page 2 of FN8183 Rev.10.01. This range applies specifically to the X9317US8Z and X9317US8ZT1 variants with 50 kΩ RTOTAL and SOIC-8 packaging. Industrial-grade alternatives (e.g., X9317US8IZT1) extend to –40°C to +85°C but use different part markings and temperature specifications.

Does the X9317US8ZT1 require an external clock or serial bus controller?

No, the X9317US8ZT1 uses a self-contained 3-wire up/down interface (CS, U/D, INC) with no external clock or serial protocol engine required. INC is negative-edge-triggered, and all control logic resides on-chip. This allows direct connection to GPIO pins of any microcontroller without dedicated SPI or I²C hardware, reducing system complexity and firmware overhead for basic trimming functions.

How is the wiper position stored and recalled in the X9317US8ZT1?

The X9317US8ZT1 stores the current wiper position in on-chip nonvolatile memory when CS transitions HIGH while INC is held HIGH. Upon subsequent power-up, the stored value is automatically loaded into the wiper counter, positioning RW at the last-saved tap. This occurs within 5 µs after VCC stabilizes, as specified in the Power-up and Down Requirements section (page 6), ensuring deterministic startup behavior without host intervention.

What is the maximum wiper current rating for the X9317US8ZT1?

The X9317US8ZT1 supports a maximum wiper current (IW) of ±4.4 mA, as specified in the Potentiometer Specifications table (page 4). This rating applies across the full operating temperature range and is independent of RTOTAL value. Exceeding this current may cause irreversible drift or damage to the internal wiper switch network, especially under sustained DC conditions.

Can the X9317US8ZT1 be used in a two-terminal (rheostat) configuration?

Yes, the X9317US8ZT1 supports two-terminal operation by connecting either RH or RL to RW externally and using the remaining fixed terminal with RW as the variable resistance element. The datasheet explicitly confirms this in the Applications section (page 1) and Figure 4 (Two Terminal Variable Resistor). Wiper resistance remains 200 Ω typical, and end-to-end resistance tolerance (±20%) applies to the selected terminal pair.