Renesas X9317ZS8-2.7

Overview

X9317ZS8-2.7 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) with 100 wiper tap points, nonvolatile wiper position storage, and 2.7V to 5.5V supply operation. It implements a 99-element resistor array with temperature-compensated end-to-end resistance tolerance of ±20%, low standby current (<5 µA), and 10 kΩ total resistance - used for precision DC bias adjustment and voltage regulator output control in space-constrained industrial systems.

For engineers reviewing the X9317ZS8-2.7 datasheet, X9317ZS8-2.7 pinout, X9317ZS8-2.7 application, or X9317ZS8-2.7 equivalent, key selection considerations include its 3-wire up/down interface timing (tCYC = 2 µs), wiper resistance (200 Ω typ. at 5 V), ratiometric temperature coefficient (±20 ppm/°C), and MSOP-8 package compatibility with automated SMT assembly.

Technical Context

The X9317ZS8-2.7 integrates a 7-bit up/down counter, decoder, and nonvolatile memory to control wiper position across 99 resistive elements. Its "make-before-break" switching ensures continuity during tap transitions, while the CS/INC/U/D interface enables deterministic wiper movement without clock or address lines.

Wiper position is stored on CS↑ with INC HIGH (5–10 ms store cycle), recalled automatically at power-up, and retained for 100 years. The device operates as either a three-terminal voltage divider (RH–RW–RL) or two-terminal variable resistor (RW–RL or RW–RH), with wiper current limited to ±4.4 mA and noise performance of –120 dBV (ref 1 kHz).

Key Specifications

Pinout & Package

Package: 8-lead MSOP (M8.118), RoHS-compliant, 3.0 mm × 3.0 mm × 0.85 mm body, moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP41010-I/P, the X9317ZS8-2.7 delivers guaranteed power-up wiper recall and deterministic 3-wire timing without protocol overhead - simplifying firmware and eliminating boot-time calibration delays in safety-critical or fast-startup systems.

Availability

X9317ZS8-2.7 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 obsolescence mitigation, and RoHS-compliant manufacturing.

Supply support for X9317ZS8-2.7 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 Corporation is a global semiconductor leader delivering trusted embedded design innovation, automotive SoCs, analog & power solutions, and microcontrollers.

The X9317 family was designed for precision analog trimming in industrial, medical, and communications equipment where mechanical potentiometers fail due to wear, contamination, or thermal instability.

FAQ

What is the maximum wiper current rating for the X9317ZS8-2.7?

The X9317ZS8-2.7 supports a maximum wiper current of ±4.4 mA under specified test conditions. This limit applies regardless of supply voltage within the 2.7 V to 5.5 V range and ensures reliable operation of the internal switching network and resistor elements. Exceeding this current may degrade wiper resistance stability or accelerate wear in nonvolatile memory programming cycles. Always verify current paths in your application schematic against this specification before final layout.

Does the X9317ZS8-2.7 retain its wiper position after power cycling?

Yes, the X9317ZS8-2.7 automatically recalls its last-stored wiper position from nonvolatile memory upon power-up. This behavior is guaranteed by design and requires no host intervention. The wiper value is written to memory only when CS transitions HIGH while INC is held HIGH (a 5–10 ms store cycle), and data retention is rated for 100 years. This makes the X9317ZS8-2.7 ideal for applications requiring repeatable startup conditions, such as factory-calibrated sensor offsets or display bias settings.

What package type is used for the X9317ZS8-2.7?

The X9317ZS8-2.7 uses an 8-lead MSOP (Mini Small Outline Plastic) package, designated M8.118 per Renesas package drawing. Its dimensions are 3.0 mm × 3.0 mm × 0.85 mm with 0.65 mm lead pitch. This RoHS-compliant, surface-mount package supports high-density PCB layouts and is compatible with standard reflow profiles including Pb-free peak temperatures. Pin 1 identification is marked via a mold feature on the top surface.

Can the X9317ZS8-2.7 operate from a 2.7 V supply?

Yes, the X9317ZS8-2.7 is explicitly rated for operation from 2.7 V to 5.5 V, as confirmed in the Ordering Information table and Absolute Maximum Ratings section of the FN8183 datasheet. At 2.7 V, wiper resistance increases to ≤1000 Ω (vs. ≤400 Ω at 5 V), and active supply current remains within specification. All timing parameters-including tCYC (2 µs min) and tIW (1–5 µs)-are validated across this full voltage range, enabling reliable use in battery-powered or low-voltage industrial systems.

How does the 3-wire interface of the X9317ZS8-2.7 differ from I²C or SPI?

The X9317ZS8-2.7 uses a dedicated 3-wire up/down interface (CS, U/D, INC) with no clock or data lines-unlike I²C or SPI. INC is negative-edge-triggered; each toggle moves the wiper one position in the direction set by U/D. CS enables the device and initiates nonvolatile store when raised with INC HIGH. This eliminates protocol overhead, reduces firmware complexity, and avoids bus arbitration or address conflicts. It is fully GPIO-driven and requires no peripheral hardware, making it ideal for resource-constrained MCUs.