Renesas X9420YS16-2.7T1

Overview

X9420YS16-2.7T1 from Intersil is a single-channel, SPI-interface digitally controlled potentiometer (XDCP™) with 2.5 kΩ end-to-end resistance, 64-tap resolution, 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 signal conditioning circuits.

For engineers reviewing the X9420YS16-2.7T1 datasheet, X9420YS16-2.7T1 pinout, X9420YS16-2.7T1 application, or X9420YS16-2.7T1 equivalent, key selection criteria include its 2.5 kΩ resistor array, ±1 MI absolute linearity, nonvolatile storage of four wiper positions, and SOIC-16 package compatibility with industrial temperature range (0°C to +70°C).

Technical Context

The X9420YS16-2.7T1 implements a 63-segment resistor array with CMOS-switched wiper controlled by a volatile 6-bit Wiper Counter Register (WCR), enabling precise tap selection via SPI commands including direct write, register transfer, and real-time increment/decrement. Its architecture supports both three-terminal potentiometer and two-terminal variable resistor configurations.

It features four 6-bit nonvolatile Data Registers (DR0–DR3) for storing wiper positions or system parameters, with internal high-voltage write cycles (tWR = 5–10 ms) triggered on CS rising edge. Power-up automatically loads DR0 into the WCR, and hardware write protection (WP pin) disables nonvolatile writes while permitting volatile wiper updates.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (300 mil), RoHS-compliant Pb-free plus anneal finish (M16.3 drawing).

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 X9420YS16-2.7T1 uniquely combines 2.5 kΩ resistance, SPI compatibility, SOIC-16 footprint, and bipolar analog supply support-making it optimal for legacy-compatible, low-noise, bipolar-signal trimming where pin count and package interchangeability are critical.

Availability

X9420YS16-2.7T1 is available at Aetrix Electronics and suitable for voltage reference trimming, programmable power supply feedback, and audio signal level control requiring stable component supply and long-term calibration retention.

Supply support for X9420YS16-2.7T1 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 manufacturer specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X9420 family was designed as a solid-state replacement for mechanical potentiometers in digitally controlled analog systems, emphasizing nonvolatile storage, low noise (−140 dBV), and robustness across extended temperature ranges.

FAQ

What is the operating voltage range for the analog section of the X9420YS16-2.7T1?

The X9420YS16-2.7T1 supports analog supplies V+ = +2.7V to +5.5V and V− = −2.7V to −5.5V, enabling true bipolar operation. This allows the wiper output (VW/RW) to swing fully between the analog rails, making the X9420YS16-2.7T1 suitable for AC-coupled signal paths and precision offset adjustment in dual-supply systems.

How many wiper positions can be stored nonvolatily in the X9420YS16-2.7T1?

The X9420YS16-2.7T1 includes four 6-bit nonvolatile Data Registers (DR0–DR3), each capable of storing one wiper position. Upon power-up, DR0 is automatically loaded into the volatile Wiper Counter Register (WCR), ensuring repeatable startup behavior. All four registers retain data for 100 years without power.

Does the X9420YS16-2.7T1 require external components for basic SPI operation?

No external passive components are required for core SPI functionality of the X9420YS16-2.7T1. However, proper decoupling (e.g., 0.1 µF ceramic capacitor) between VCC and VSS is mandatory, and separate analog supply decoupling is recommended. The SO and SI pins support bus sharing (tri-state SO), eliminating need for external buffers in point-to-point configurations.

What is the maximum SPI clock frequency supported by the X9420YS16-2.7T1?

The X9420YS16-2.7T1 supports an SPI clock frequency (fSCK) up to 2.0 MHz, with minimum cycle time of 500 ns. Timing parameters including tSU (50 ns setup), tH (50 ns hold), and tV (100 ns output valid) are specified under standard load conditions, ensuring reliable communication with most modern microcontrollers without additional timing margining.

Can the X9420YS16-2.7T1 be used as a two-terminal variable resistor?

Yes, the X9420YS16-2.7T1 can be configured as a two-terminal variable resistor by connecting either VH/RH or VL/RL to the wiper (VW/RW), leaving the unused terminal open or grounded depending on application. This mode is commonly used in current-setting and gain-control applications where only one adjustable resistance element is needed.