Renesas X9279TV14IZ-2.7

Overview

X9279TV14IZ-2.7 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 2.7V to 5.5V supply operation. It functions as a programmable three-terminal potentiometer or two-terminal variable resistor for precision analog trimming in voltage regulators, sensor signal conditioning, and audio gain control.

For engineers reviewing the X9279TV14IZ-2.7 datasheet, X9279TV14IZ-2.7 pinout, X9279TV14IZ-2.7 application, or X9279TV14IZ-2.7 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 requiring stable digital potentiometer replacement of mechanical trimmers.

Technical Context

The X9279TV14IZ-2.7 implements a monolithic CMOS resistor ladder with 255 discrete segments and 256 tap points, controlled by an 8-bit volatile Wiper Counter Register (WCR). Its 2-wire bus interface supports read/write/transfer operations to four non-volatile data registers (DR0–DR3), with power-up recall loading DR0 into WCR.

Hardware write protection via the WP pin disables non-volatile writes when asserted low. The device operates across 2.7V–5.5V, maintains <5 µA standby current, and features ±3 mA wiper current rating with 50 mW per-pot power dissipation at +25°C.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4 mm width), RoHS-compliant, Pb-free (e3 termination).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL95810 and ISL95811, the X9279TV14IZ-2.7 uniquely combines 2.7–5.5 V operation, 256-tap resolution, four non-volatile registers, and power-on recall - making it the only option for robust, self-initializing analog trimming in wide-input-voltage industrial systems.

Availability

X9279TV14IZ-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply trimming, and audio gain control requiring stable component supply across extended temperature and voltage ranges.

Supply support for X9279TV14IZ-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

Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.

The X9279 product line was designed for replacing mechanical potentiometers in high-reliability analog adjustment applications, emphasizing non-volatile configuration storage, low-power operation, and industrial-grade temperature performance.

FAQ

What is the supply voltage range supported by the X9279TV14IZ-2.7?

The X9279TV14IZ-2.7 operates from 2.7 V to 5.5 V, enabling direct integration into both 3.3 V and 5 V systems without level translation. This wider range distinguishes it from legacy versions like the X9279TV14I (5 V ±10%) and supports reliable operation during brown-out conditions where supply dips below 4.5 V. The X9279TV14IZ-2.7 maintains full functionality-including 2-wire communication and wiper positioning-across this entire range.

Does the X9279TV14IZ-2.7 retain its wiper position after power cycling?

Yes, the X9279TV14IZ-2.7 retains wiper settings via four non-volatile data registers (DR0–DR3) with 100-year data retention and 100,000 write cycles. On power-up, it automatically loads the value from DR0 into the volatile Wiper Counter Register (WCR), ensuring repeatable default analog behavior. This eliminates the need for host initialization code to restore calibration - a key advantage over volatile-only digital pots.

How many devices can share the same 2-wire bus with the X9279TV14IZ-2.7?

Up to eight X9279TV14IZ-2.7 devices can coexist on a single 2-wire bus. Address bits A2–A0 (pins 2, 4, 9) configure the LSBs of the 7-bit slave address, while A3 (pin 10) must be grounded. The fixed device ID "0101" (binary) occupies the MSBs, yielding a full address space of 0x50–0x57. Each device responds only to commands matching its physical address configuration.

What is the maximum wiper current rating for the X9279TV14IZ-2.7?

The X9279TV14IZ-2.7 supports a maximum wiper current of ±3 mA. Exceeding this limit risks damaging the internal CMOS switches or degrading long-term reliability. This rating applies regardless of supply voltage (2.7–5.5 V) and must be respected in both potentiometer (three-terminal) and rheostat (two-terminal) configurations. Power dissipation per pot is limited to 50 mW at +25°C.

Can the X9279TV14IZ-2.7 be used in place of a mechanical potentiometer without circuit redesign?

Yes - the X9279TV14IZ-2.7 provides pin-compatible replacement for 100 kΩ mechanical potentiometers in three-terminal (RH/RW/RL) or two-terminal (RW/RL or RW/RH) configurations. Its 14-lead TSSOP footprint matches standard surface-mount layouts, and its 0.4% resolution and ±1 MI linearity meet or exceed typical mechanical pot performance. No schematic changes are needed beyond adding pull-up resistors on SDA/SCL and connecting A3 to GND.