Renesas X9271TV14-2.7T1

Overview

X9271TV14-2.7T1 from Intersil (now Renesas) is a single-supply, low-power, 256-tap digitally controlled potentiometer (XDCP™) with SPI interface, 50kΩ end-to-end resistance, ±20% tolerance, and 14-lead TSSOP package. 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 X9271TV14-2.7T1 datasheet, X9271TV14-2.7T1 pinout, X9271TV14-2.7T1 application, or X9271TV14-2.7T1 equivalent, key selection criteria include its 2.7V–5.5V supply range, nonvolatile data register storage, power-on recall of DR0, <3µA standby current, and SPI-compatible serial interface with hardware write protection.

Technical Context

The X9271TV14-2.7T1 implements a monolithic CMOS resistor ladder of 255 segments with CMOS-switched wiper access controlled by an 8-bit volatile Wiper Counter Register (WCR). Its SPI interface supports read/write/transfer operations using a 3-byte instruction set with device addressing via A0/A1 pins and status monitoring via WIP bit.

It integrates four 8-bit nonvolatile data registers (DR0–DR3) in Bank 0 for persistent wiper position storage, with DR0 loaded automatically to WCR at power-up. The device supports increment/decrement mode for real-time fine-tuning and features hardware write protect (WP) and HOLD functionality for robust bus management.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5241BRMZ50 and MCP41050-I/P, the X9271TV14-2.7T1 provides superior system-level reliability through dual hardware safeguards (WP + HOLD), guaranteed power-on recall from DR0, and tighter wiper resistance spec - critical for precision analog loops in industrial control.

Availability

X9271TV14-2.7T1 is available at Aetrix Electronics and suitable for voltage regulator trimming, sensor calibration, audio gain control, and LED biasing applications requiring stable component supply across automotive, industrial, and medical electronics programs.

Supply support for X9271TV14-2.7T1 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 (acquired by Renesas Electronics in 2017) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9271 series was designed as a drop-in digital replacement for mechanical potentiometers in industrial control, test equipment, and communication infrastructure - emphasizing nonvolatile calibration, low-power operation, and robust serial interface.

FAQ

What is the function of the HOLD pin on the X9271TV14-2.7T1?

The HOLD pin on the X9271TV14-2.7T1 is an active-low bus pause control that suspends ongoing SPI communication without resetting the internal state. When asserted (LOW) while SCK is LOW, it halts data transfer mid-sequence; releasing HOLD (HIGH) resumes from the exact point. This enables MCU interrupt servicing without losing command context - a feature not present in basic digital potentiometers like the MCP41050-I/P. The X9271TV14-2.7T1 uses HOLD to maintain deterministic timing in real-time control loops.

Does the X9271TV14-2.7T1 support true 3-wire SPI operation?

Yes, the X9271TV14-2.7T1 supports true 3-wire SPI operation by allowing SO and SI to be connected together on a shared bidirectional data line. Its SO pin is three-state and SI is CMOS-input, enabling half-duplex communication with proper direction control. This reduces MCU pin count in space-constrained designs. The X9271TV14-2.7T1 achieves this without external components, unlike some competing devices requiring external transceivers or pull-ups for shared-line operation.

How does power-on recall work in the X9271TV14-2.7T1?

Power-on recall in the X9271TV14-2.7T1 automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR) when VCC stabilizes. This ensures the potentiometer assumes a known, factory-programmed or user-saved resistance value immediately after power-up - critical for safety-critical biasing in amplifiers or regulators. Unlike alternatives such as the AD5241BRMZ50, the X9271TV14-2.7T1 guarantees this behavior regardless of prior WCR state, making it suitable for unattended systems.

What is the maximum wiper current rating for the X9271TV14-2.7T1?

The X9271TV14-2.7T1 has a maximum wiper current rating of ±3mA under recommended operating conditions. Exceeding this limit risks localized heating and long-term resistance drift in the CMOS switch network. At VCC = 5V and 50kΩ end-to-end resistance, this corresponds to a safe voltage differential of ≤150mV across the wiper segment. Designers must ensure external circuitry (e.g., op-amp outputs) limits current into RW - a constraint more stringent than the ±6mA absolute maximum rating, which applies only for ≤10 seconds.

Can the X9271TV14-2.7T1 be used in AC signal paths?

The X9271TV14-2.7T1 is specified for DC and low-frequency analog applications only, with 10pF capacitance on RH/RL terminals and 25pF on RW. Its resistor ladder exhibits frequency-dependent attenuation above ~10kHz due to parasitic capacitance and switch on-resistance. While usable for audio-band signals (<20kHz) with careful layout, it is not characterized for RF or high-speed AC signal routing. For such use cases, dedicated digital attenuators or RF switches are recommended instead of the X9271TV14-2.7T1.