Renesas X9319WS8

Overview

X9319WS8 from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 10 kΩ end-to-end resistance with 100 wiper tap points, nonvolatile wiper position storage, and 3-wire serial interface (CS/U/D/INC). It functions as a solid-state three-terminal voltage divider or two-terminal variable resistor for precision analog trimming in DC-biased circuits.

For engineers reviewing the X9319WS8 datasheet, X9319WS8 pinout, X9319WS8 application, or X9319WS8 equivalent, this device supports repeatable bias control in LCDs, laser diodes, and voltage regulators where power-up repeatability, ±20% RTOTAL tolerance, and 100k-cycle endurance are critical selection criteria.

Technical Context

The X9319WS8 integrates a 99-element resistor array with make-before-break wiper switching, a 7-bit up/down counter, and nonvolatile memory for wiper position retention. Its control logic responds to negative-edge-triggered INC pulses while U/D sets direction and CS enables selection or initiates nonvolatile store on CS↑ with INC HIGH.

It operates at VCC = 4.5–5.5 V, supports terminal voltages up to +10 V (RH/RL), delivers ≤200 Ω wiper resistance, and achieves ±1% absolute linearity across 0–10 V. Temperature coefficients are specified as ±300 ppm/°C for RTOTAL and ±20 ppm/°C ratiometric.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (150 mil), Pb-free (RoHS compliant), JEDEC MS-012 compliant, M8.15E outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5243BRMZ10 and MCP41010-I/P, the X9319WS8 uniquely guarantees deterministic power-up behavior without host intervention, trades off communication flexibility (3-wire vs. I²C/SPI) for guaranteed repeatability in unattended or safety-critical analog biasing.

Availability

X9319WS8 is available at Aetrix Electronics and suitable for LCD bias control, laser diode current regulation, and voltage regulator output trimming requiring stable component supply, long-term calibration retention, and RoHS-compliant packaging.

Supply support for X9319WS8 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

Intersil Corporation (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9319WS8 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, engineered for analog trimming tasks where mechanical potentiometer reliability, repeatability, and nonvolatile setting retention are essential.

FAQ

What is the power-up behavior of the X9319WS8?

The X9319WS8 automatically recalls the last wiper position stored in nonvolatile memory upon power-up, ensuring repeatable analog settings without host MCU intervention. This occurs within 500 µs after VCC reaches its final value, and the wiper remains stable at that position until updated via the 3-wire interface. The X9319WS8 does not default to mid-scale or zero; it strictly restores the previously stored value.

Can the X9319WS8 operate with a 3.3 V supply?

No, the X9319WS8 is specified for VCC = 4.5 V to 5.5 V only. Its internal CMOS logic, switch drivers, and nonvolatile memory programming circuitry require ≥4.5 V to function reliably. Using 3.3 V may result in incomplete wiper movement, failed nonvolatile store operations, or undefined logic states on CS/U/D/INC inputs. For 3.3 V systems, consider alternatives like the MCP41010-I/P.

How is nonvolatile storage triggered on the X9319WS8?

Nonvolatile storage is triggered by raising CS from LOW to HIGH while the INC input is held HIGH. This sequence writes the current wiper position to nonvolatile memory. The store operation completes within 20 ms, after which the device enters standby mode. No additional clock edges or timing sequences are required-the X9319WS8 handles the entire write cycle internally.

What is the maximum allowable voltage across RH and RL terminals of the X9319WS8?

The X9319WS8 supports a maximum voltage of +10 V across RH and RL terminals with respect to VSS, regardless of VCC level. This allows direct use in circuits with 10 V reference sources or op-amp rails, provided the wiper (RW) remains within the RH–RL voltage range. Exceeding +10 V risks permanent damage to the resistor array or wiper switches.

Does the X9319WS8 support bidirectional wiper movement during a single CS activation?

Yes-the X9319WS8 allows dynamic reversal of wiper direction during an active CS cycle. While CS remains LOW, the U/D input can be changed at any time to switch between incrementing and decrementing wiper position on subsequent INC edges. This enables real-time trimming loops where the host system adjusts direction based on feedback, without deselecting and reselecting the device.