Renesas X9279TV14IZ

Overview

X9279TV14IZ from Intersil is a single-channel, 256-tap, digitally controlled potentiometer (XDCP™) with 2-wire serial interface, 100 kΩ end-to-end resistance, -40°C to +85°C industrial temperature range, and Pb-free TSSOP-14 package - used for precision DC biasing, gain trimming, and reference voltage adjustment in sensor signal conditioning and power management circuits.

For engineers reviewing the X9279TV14IZ datasheet, X9279TV14IZ pinout, X9279TV14IZ application, or X9279TV14IZ equivalent, this page delivers verified technical context, validated pin functions, confirmed non-volatile register behavior, wiper resistance at 2.7V operation, and real-world use cases in LED bias control and RF amplifier tuning - all extracted from official Intersil documentation.

Technical Context

The X9279TV14IZ implements a monolithic CMOS resistor ladder of 255 segments with CMOS-switched wiper selection controlled by an 8-bit volatile Wiper Counter Register (WCR). Its 2-wire bus supports read/write/transfer operations to four non-volatile data registers (DR0–DR3), with power-up recall loading DR0 into WCR.

It operates across 2.7V–5.5V VCC, features hardware write protection via the WP pin, and uses address pins A0–A2 (with A3 grounded) to support up to eight devices on one bus. Wiper resistance is 150 Ω typical at 5V and increases to ~300 Ω at 3V, directly impacting analog path accuracy in voltage divider configurations.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4 mm wide), Pb-free (RoHS compliant), M14.173 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9279TV14IZ, ISL95810 and ISL95811 offer SPI speed advantages but sacrifice 2-wire simplicity, hardware write protection, and guaranteed power-on recall - making them less suitable for robust industrial recalibration workflows where bus pin count and fail-safe defaults are critical.

Availability

X9279TV14IZ is available at Aetrix Electronics and suitable for industrial sensor calibration, LED driver tuning, and RF amplifier biasing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X9279TV14IZ 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 (now part of Renesas Electronics) is a U.S.-based semiconductor company specializing in precision analog and power management ICs for industrial, communications, and computing markets.

The X9279 product line was designed specifically for replacing mechanical potentiometers in automated calibration systems, offering non-volatile storage, digital interface, and industrial temperature reliability - targeting embedded control and instrumentation applications.

FAQ

What is the supply voltage range for the X9279TV14IZ?

The X9279TV14IZ operates from 2.7V to 5.5V, supporting both 3.3V and 5V system rails. This range is explicitly specified for the "-2.7" suffix variant in the official Intersil ordering table and confirmed in the Absolute Maximum Ratings section. Operation outside this window may cause undefined wiper behavior or register corruption in the X9279TV14IZ.

Does the X9279TV14IZ retain its wiper position after power cycling?

Yes - the X9279TV14IZ automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR) at power-up. This power-on recall function is guaranteed in the datasheet and ensures the X9279TV14IZ resumes its last-saved analog setting without host intervention.

How many non-volatile registers does the X9279TV14IZ have?

The X9279TV14IZ contains four 8-bit non-volatile data registers (DR0–DR3) in Bank 0, plus 12 additional non-volatile registers across Banks 1–3 - totaling 16 registers. All support read/write via the 2-wire interface, though only Bank 0 registers can transfer directly to the WCR in the X9279TV14IZ.

What is the maximum wiper current rating for the X9279TV14IZ?

The X9279TV14IZ specifies a maximum wiper current (IW) of ±3 mA under continuous operation. Exceeding this limit risks localized heating, resistance drift, or permanent damage to the internal CMOS switches - a hard limit defined in the Absolute Maximum Ratings table for the X9279TV14IZ.

Is the X9279TV14IZ pin-compatible with other X9279 variants?

Yes - all X9279 variants, including X9279TV14IZ, share identical 14-lead TSSOP packaging and pinout per the M14.173 drawing. Differences lie only in temperature grade (-40°C to +85°C), supply range (2.7V–5.5V), and Pb-free compliance - not physical layout - ensuring drop-in replacement capability within the same family for the X9279TV14IZ.