Renesas X9420YV14-2.7T1

Overview

X9420YV14-2.7T1 from Intersil is a single-channel, SPI-interface digitally controlled potentiometer (XDCP™) with 64-tap resolution, 2.5kΩ end-to-end resistance, and dual-supply analog operation (V+ = +2.7V to +5.5V, V− = −2.7V to −5.5V), designed for precision voltage divider and variable resistor functions in low-noise signal conditioning circuits.

For engineers reviewing the X9420YV14-2.7T1 datasheet, X9420YV14-2.7T1 pinout, X9420YV14-2.7T1 application, or X9420YV14-2.7T1 equivalent, key selection criteria include its 14-pin TSSOP package, nonvolatile storage of four wiper positions, <1µA standby current, ±1 MI absolute linearity, and compatibility with 2.7V–5.5V digital supply (VCC) and bipolar analog rails.

Technical Context

The X9420YV14-2.7T1 implements a 63-segment resistor array with CMOS-switched wiper controlled by a volatile 6-bit Wiper Counter Register (WCR), which loads DR0 at power-up. Its SPI interface supports register-oriented commands including direct WCR read/write, data register transfer, and real-time increment/decrement via SCK edge-triggered SI level.

It features four 6-bit nonvolatile Data Registers (DR0–DR3) with 10ms max write time, hardware write protection (WP pin), HOLD-enabled serial pause, and dual-domain supply architecture: VCC powers digital logic, while independent V+/V− supplies the analog potentiometer section-enabling true bipolar operation and isolation from digital noise.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4mm width), RoHS-compliant, Pb-free plus anneal finish (M14.173 drawing). Pin 1 marked with dot; pin 1 corner defined by chamfer or index area per JEDEC MO-153-AC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL22416 and ISL95311, the X9420YV14-2.7T1 uniquely combines bipolar analog operation, four nonvolatile registers, hardware write protection, and 14-pin TSSOP packaging-making it the only option for compact, secure, bipolar-adjustable analog control in commercial-temperature designs.

Availability

X9420YV14-2.7T1 is available at Aetrix Electronics and suitable for audio signal conditioning, industrial sensor calibration, and programmable reference generation requiring stable component supply and long-term parameter retention.

Supply support for X9420YV14-2.7T1 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 (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 X9420 product line delivers digitally controlled potentiometers with nonvolatile storage and SPI interfaces, targeting applications demanding reliable, software-configurable analog trimming without mechanical wear or manual adjustment.

FAQ

What is the recommended power-up sequence for the X9420YV14-2.7T1?

The X9420YV14-2.7T1 requires strict power sequencing: apply VCC first, then V+ and V−, and finally the potentiometer terminals (VH/RH, VL/RL, VW/RW). Violating this order risks incomplete DR0 recall or latch-up. The VCC ramp rate must stay within 0.2–50 V/msec, and VCC must remain below 0.1V for >1 second after power-down to ensure correct wiper register initialization at next power-up. This behavior is explicitly defined in the X9420YV14-2.7T1 datasheet Section "POWER-UP REQUIREMENTS".

Does the X9420YV14-2.7T1 support true bipolar operation?

Yes, the X9420YV14-2.7T1 supports true bipolar analog operation via separate V+ (+2.7V to +5.5V) and V− (−2.7V to −5.5V) supply pins, enabling the resistor array to handle signals spanning both rails-e.g., ±2.5V in op-amp circuits. This is distinct from unipolar DCPs that only accept VSS and VDD. The X9420YV14-2.7T1's VH/RH, VL/RL, and VW/RW pins tolerate voltages from V− to V+, and its absolute linearity specification (±1 MI) applies across the full bipolar range.

How many wiper positions can be stored nonvolatily in the X9420YV14-2.7T1?

The X9420YV14-2.7T1 contains four 6-bit nonvolatile Data Registers (DR0–DR3), each capable of storing one wiper position (0–63). DR0 is automatically loaded into the volatile Wiper Counter Register (WCR) at power-up, providing guaranteed default state recovery. All DR writes require up to 10ms internal write time and are protected by the WP pin. This multi-position storage enables factory calibration, user presets, and fail-safe fallback states-all retained for 100 years without power.

Can the X9420YV14-2.7T1 be used with a 3.3V microcontroller SPI interface?

Yes, the X9420YV14-2.7T1 is fully compatible with 3.3V SPI controllers: its VCC range is 2.7V–5.5V, VIH is VCC × 0.7 (≥2.31V at 3.3V), and VIL is VCC × 0.1 (≤0.33V). The SO output is push-pull and drives to full VCC logic levels, eliminating need for external pull-ups. SCK max frequency is 2MHz, well within typical 3.3V MCU capabilities. All timing parameters (tSU, tH, tDIS, etc.) are specified down to 2.7V VCC, confirming robust operation at 3.3V.

What is the function of the HOLD pin on the X9420YV14-2.7T1?

The HOLD pin on the X9420YV14-2.7T1 pauses an active SPI transaction without resetting the command sequence: when asserted LOW while SCK is LOW, it freezes clock and data flow; returning HOLD to HIGH (with SCK still LOW) resumes communication from the exact point of interruption. This enables priority interrupt handling in resource-constrained systems. If unused, HOLD must be tied HIGH; leaving it floating may cause spurious pauses or communication errors. The feature is documented in the "PIN DESCRIPTIONS" and "PRINCIPLES OF OPERATION" sections of the X9420YV14-2.7T1 datasheet.