Renesas X9279UV14IZ-2.7

Overview

X9279UV14IZ-2.7 from Intersil is a single-channel, 256-tap digitally controlled potentiometer (XDCP™) with 50kΩ end-to-end resistance, 2-wire serial interface, and operation from 2.7V to 5.5V. It implements a volatile wiper counter register (WCR) and four non-volatile data registers (DR0–DR3), enabling programmable resistance adjustment in analog signal conditioning, gain control, and DC bias trimming circuits.

For engineers reviewing the X9279UV14IZ-2.7 datasheet, X9279UV14IZ-2.7 pinout, X9279UV14IZ-2.7 application, or X9279UV14IZ-2.7 equivalent, this device supports precise wiper positioning via I²C-compatible bus, power-up recall from DR0, hardware write protection (WP), and industrial temperature range (−40°C to +85°C) in a Pb-free 14-lead TSSOP package.

Technical Context

The X9279UV14IZ-2.7 integrates a monolithic CMOS resistor ladder of 255 segments with CMOS switch-controlled wiper (RW) selection driven by an 8-bit Wiper Counter Register. Its 2-wire interface uses open-drain SDA and CMOS-input SCL, with address pins A0–A2 supporting up to eight devices on one bus; A3 must be grounded.

Non-volatile writes to DR0–DR3 require WP = LOW and execute in ≤10 ms, while volatile WCR updates occur instantly. Power-on recall loads DR0 into WCR, ensuring repeatable startup resistance. Wiper resistance is 150 Ω typical at 5 V and 300 Ω at 3 V, with ±20% end-to-end tolerance and ±1 MI absolute linearity error.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4 mm wide), Pb-free (RoHS compliant), moisture sensitivity level (MSL) rated per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9279UV14IZ-2.7, ISL95810 offers lower resistance but omits hardware write protection, while ISL95811 matches the WP function and voltage range but doubles the end-to-end resistance-making it suitable where higher impedance or reduced wiper current is needed.

Availability

X9279UV14IZ-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply feedback, and RF bias control requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9279UV14IZ-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 series was designed as a drop-in replacement for mechanical potentiometers in analog trimming and calibration applications, emphasizing non-volatile storage, low power, and robust 2-wire control.

FAQ

What is the end-to-end resistance of the X9279UV14IZ-2.7?

The X9279UV14IZ-2.7 has a nominal end-to-end resistance of 50 kΩ between RH and RL terminals, with ±20% tolerance across temperature and process variation. This value is fixed per device variant and cannot be altered via programming or configuration.

Does the X9279UV14IZ-2.7 support power-on recall, and how does it work?

Yes, the X9279UV14IZ-2.7 automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR) at power-up. This ensures repeatable wiper position without host intervention, provided DR0 contains the desired startup value before power-down.

Can the X9279UV14IZ-2.7 operate from a 3.3 V supply?

Yes, the X9279UV14IZ-2.7 is fully specified for operation from 2.7 V to 5.5 V, making it compatible with standard 3.3 V logic and power domains. All electrical parameters-including wiper resistance, standby current (<5 µA), and 2-wire timing-are guaranteed across this range.

How many non-volatile data registers does the X9279UV14IZ-2.7 have, and what is their purpose?

The X9279UV14IZ-2.7 includes four 8-bit non-volatile data registers (DR0–DR3), each capable of storing a wiper position (0–255) or system parameter. They support 100,000 write cycles and retain data for 100 years, enabling calibration storage and multi-point configuration.

Is hardware write protection available on the X9279UV14IZ-2.7, and how is it implemented?

Yes, the X9279UV14IZ-2.7 features a dedicated hardware write protect (WP) pin. When WP is held LOW, non-volatile writes to DR0–DR3 are enabled; when WP is HIGH, those writes are blocked. This prevents unintended overwrites during normal system operation or firmware updates.