Renesas X9317US8T1

Overview

X9317US8T1 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) with 100 wiper tap points, nonvolatile wiper position storage, and 3-wire serial up/down interface. It implements a 99-element resistor array with ±20% end-to-end resistance tolerance, operates from 2.7V to 5.5V, and delivers low-power operation (<5µA standby current) for precision analog trimming in voltage regulator feedback paths, laser diode bias control, and LCD bias adjustment.

For engineers reviewing the X9317US8T1 datasheet, X9317US8T1 pinout, X9317US8T1 application, or X9317US8T1 equivalent, this device supports stable wiper positioning across power cycles, offers temperature-compensated resistance matching (±20 ppm/°C ratiometric TC), and enables mechanical potentiometer replacement in space-constrained SOIC-8 layouts without recalibration.

Technical Context

The X9317US8T1 integrates a 7-bit up/down counter, decoder, and nonvolatile memory to control wiper position across 100 discrete taps on a 99-resistor ladder. Its "make-before-break" switching ensures glitch-free transitions during wiper movement, while the 3-wire CS/U/D/INC interface allows deterministic, edge-triggered control without clock or data framing overhead.

It functions as either a three-terminal voltage divider (RH–RW–RL) or two-terminal variable resistor (RW–RL or RW–RH), with wiper resistance specified at 200Ω (typ) at 5V and 400Ω (typ) at 2.7V. The device retains wiper settings for 100 years and withstands 100,000 write cycles per bit, supporting long-life industrial calibration systems.

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 MCP41HV51-503, the X9317US8T1 offers simpler 3-wire control with no protocol overhead, guaranteed nonvolatile recall at power-up, and optimized low-noise performance (–120 dBV) for sensitive analog signal paths-making it ideal for cost- and space-constrained trimming where deterministic, minimal-GPIO control is prioritized.

Availability

X9317US8T1 is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias control, and voltage regulator output control requiring stable component supply, long-term calibration retention, and RoHS-compliant packaging.

Supply support for X9317US8T1 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.

The X9317US8T1 belongs to Renesas' XDCP™ (Digitally Controlled Potentiometer) product line, designed specifically for replacing mechanical potentiometers in precision analog trimming applications requiring nonvolatile setting retention and low-noise performance.

FAQ

What is the maximum wiper current rating for the X9317US8T1?

The X9317US8T1 supports a maximum wiper current (IW) of ±4.4 mA under all operating conditions. This rating applies across the full 2.7V–5.5V supply range and –40°C to +85°C temperature range. Exceeding this limit risks accelerated wear of the wiper switch elements and may degrade long-term reliability beyond the rated 100,000 write cycles. For current-sensing or high-current bias applications, external buffering is recommended.

Does the X9317US8T1 require an external clock or data framing for operation?

No, the X9317US8T1 does not require an external clock or data framing. It uses a simple 3-wire asynchronous interface: CS (chip select), U/D (direction), and INC (increment clock). Wiper movement is triggered by negative edges on INC while CS is low, with direction determined solely by the logic level on U/D. This eliminates timing constraints associated with SPI or I²C protocols and simplifies integration with resource-limited MCUs.

How is wiper position stored and recalled in the X9317US8T1?

The X9317US8T1 stores wiper position in on-chip nonvolatile memory when CS transitions from low to high while INC is held high. Upon power-up, the device automatically recalls the last stored value and configures the wiper accordingly within 5 µs. No external command or initialization sequence is needed-the recall is fully autonomous and guaranteed across the full operating temperature range.

What is the wiper resistance specification for the X9317US8T1 at 3.3V supply?

While the X9317US8T1 datasheet specifies wiper resistance (RW) as 200 Ω (typ) at 5V and 400 Ω (typ) at 2.7V, no discrete value is given for 3.3V. Based on the monotonic relationship and test conditions, RW at 3.3V falls between those values-approximately 250–300 Ω (typ). This variation directly impacts voltage error in high-impedance feedback networks and should be factored into gain accuracy calculations for precision op-amp circuits using the X9317US8T1.

Can the X9317US8T1 be used in a two-terminal variable resistor configuration?

Yes, the X9317US8T1 can be configured as a two-terminal variable resistor by connecting either RH or RL to the wiper (RW) and using the remaining fixed terminal with RW as the adjustable resistance element. In this mode, the device provides 99 discrete resistance steps between 0 Ω and 50 kΩ (±20%), with wiper resistance contributing to total on-resistance. This configuration is commonly used for current limiting, LED brightness control, and sensor biasing where only one adjustable endpoint is required.