Renesas X9319US8IZ

Overview

X9319US8IZ from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with 100 wiper tap points, nonvolatile wiper position storage, and 3-wire serial interface (CS/U/D/INC). It functions as a three-terminal voltage divider or two-terminal variable resistor for precision analog trimming in industrial temperature range (–40°C to +85°C), with 10 kΩ end-to-end resistance and ±20% tolerance.

For engineers reviewing the X9319US8IZ datasheet, X9319US8IZ pinout, X9319US8IZ application, or X9319US8IZ equivalent, this device supports LCD bias control, laser diode bias adjustment, gain/offset trim, and voltage regulator output tuning - all requiring stable wiper position retention across power cycles and low-power CMOS operation at 5 V.

Technical Context

The X9319US8IZ integrates a 7-bit up/down counter, decoder, and nonvolatile memory to control wiper position across 100 discrete taps. Its make-before-break switching ensures continuity during wiper transitions, while ratiometric temperature coefficient (±20 ppm/°C) maintains voltage division accuracy under thermal drift.

Control logic responds to negative-edge-triggered INC pulses with direction set by U/D level and device enable via active-low CS. Wiper position is stored to nonvolatile memory only when CS rises while INC is HIGH, enabling deterministic power-up behavior without unintended writes.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5171BRMZ10 and MCP41010-I/P, the X9319US8IZ delivers deterministic power-up behavior via nonvolatile storage, superior 100-tap resolution for fine analog control, and guaranteed ±20% end-to-end resistance - making it optimal for unattended or safety-critical trimming where repeatability and zero-host-initialization are required.

Availability

X9319US8IZ is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias adjustment, gain and offset trim, voltage regulator output control, and DC bias adjustment requiring stable component supply across industrial temperature range and long-term calibration integrity.

Supply support for X9319US8IZ 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) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X9319 family was designed as solid-state replacements for mechanical potentiometers in analog trimming applications demanding nonvolatile setting retention, high reliability, and stable performance across extended temperature ranges.

FAQ

What is the operating temperature range for the X9319US8IZ?

The X9319US8IZ is rated for industrial operation from –40°C to +85°C. This range is confirmed in the Ordering Information table on page 2 of FN8185 Rev 3.00, where "X9319WS8IZ" (identical package and marking suffix "I") explicitly lists –40 to +85°C. The device's ratiometric temperature coefficient (±20 ppm/°C) and endurance specifications are validated across this full range.

Does the X9319US8IZ retain its wiper position after power cycling?

Yes, the X9319US8IZ stores wiper position in nonvolatile memory and automatically recalls it on power-up. As stated on page 1, "The position of the wiper can be stored in nonvolatile memory and then be recalled upon a subsequent power-up operation." Page 5 confirms: "When power is restored, the contents of the memory are recalled and the wiper is set to the value last stored." This behavior is intrinsic to the X9319US8IZ and requires no external components or host intervention.

What interface protocol does the X9319US8IZ use?

The X9319US8IZ uses a proprietary 3-wire serial interface consisting of Chip Select (CS), Up/Down (U/D), and Increment (INC) signals. It is not SPI, I²C, or UART. Page 1 specifies "3-wire interface"; page 5 details that INC is negative-edge-triggered and U/D sets direction, with CS enabling selection and initiating nonvolatile store on rising edge when INC is HIGH - a dedicated control scheme distinct from standard protocols.

What is the maximum voltage allowed across RH and RL terminals of the X9319US8IZ?

The absolute maximum voltage across RH and RL is +12 V, as specified in the Absolute Maximum Ratings table on page 3: "RH, RW, RL to ground … +12V". However, the recommended operating range is 0 to +10 V (page 1, Features), and the potentiometer characteristics table (page 3) defines VRH/RL as 0 to 10 V under normal operation. Exceeding 10 V risks violating linearity and tempco specs, though 12 V is the hard limit before damage.

Is the X9319US8IZ RoHS compliant and lead-free?

Yes, the X9319US8IZ is Pb-free and RoHS compliant. Page 1 states "Pb-free (RoHS compliant)" under Package, and page 2's Ordering Information confirms "PACKAGE (Pb-Free)" for X9319WS8IZ. Footnote 2 on page 2 further clarifies that Intersil Pb-free products use 100% matte tin plate termination and meet RoHS requirements, including compatibility with both SnPb and Pb-free soldering processes.