Renesas X9400YS24T1

Overview

X9400YS24T1 from Intersil is a quad digitally controlled potentiometer (XDCP™) integrating four independent 64-tap resistor arrays with SPI interface, nonvolatile data registers, and wiper position recall on power-up. It operates from 2.7V to 5.5V VCC, supports ±5V analog rails, and delivers 40Ω typical wiper resistance at 5V - used for precision voltage divider, gain/offset adjustment, and programmable biasing in mixed-signal systems.

For engineers reviewing the X9400YS24T1 datasheet, X9400YS24T1 pinout, X9400YS24T1 application, or X9400YS24T1 equivalent, key selection criteria include SPI-controlled wiper positioning across four channels, 100-year nonvolatile data retention, 100k-cycle endurance per register, dual-rail analog operation (±5V), and compatibility with industrial temperature range (-40°C to +85°C) designs.

Technical Context

The X9400YS24T1 implements four independent 63-segment resistor arrays, each controlled by a volatile 6-bit Wiper Counter Register (WCR) decoded to select one of 64 tap points. Each array features dedicated VH/RH, VL/RL, and VW/RW terminals enabling three-terminal potentiometer or two-terminal variable resistor configurations.

It uses standard SPI protocol (CS, SCK, SI, SO) with device addressing via A0/A1 pins, hardware write protection via WP, and serial hold control via HOLD. All nonvolatile writes to its four 6-bit Data Registers (DR0–DR3) require high-voltage internal programming cycles (5–10 ms), while wiper updates via WCR are immediate (≤10 µs).

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), RoHS-compliant Pb-free plus anneal finish (M24.3 package drawing). Pin pitch: 1.27 mm; body width: 7.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP42050-I/P, the X9400YS24T1 uniquely supports true bipolar analog operation (±5 V), automatic DR0-to-WCR power-up recall, and hardware write protection - critical for robust industrial calibration and signal conditioning where rail flexibility and configuration persistence are mandatory.

Availability

X9400YS24T1 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and medical instrumentation requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for X9400YS24T1 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 Corporation (now part of Renesas Electronics) is a pioneer in precision analog and power management ICs, delivering high-reliability solutions for industrial, aerospace, and infrastructure markets.

The X9400YS24T1 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical pots in calibration-critical, maintenance-free analog signal path applications.

FAQ

What is the operating temperature range for the X9400YS24T1?

The X9400YS24T1 is rated for industrial temperature operation from −40°C to +85°C. This range is confirmed in the Ordering Information table and Recommended Operating Conditions section of the FN8189 datasheet. The device uses SOIC packaging qualified for this extended range, making it suitable for deployment in harsh environments such as factory floor controllers and outdoor instrumentation where thermal stability is essential. The X9400YS24T1 maintains full specification compliance-including wiper resistance, linearity, and SPI timing-across this entire range.

Does the X9400YS24T1 support true bipolar analog operation?

Yes, the X9400YS24T1 supports true bipolar analog operation via dedicated V+ and V− pins, rated from −5.5 V to +5.5 V. This enables use in AC-coupled circuits, dual-supply op-amp configurations, and signal paths requiring negative voltage swing - unlike single-supply digital pots that clamp at VSS. The datasheet explicitly specifies analog rail limits independent of VCC, and the block diagram confirms separate analog biasing for all four resistor arrays. This capability is intrinsic to the X9400YS24T1 and does not require external level-shifting.

How many nonvolatile data registers does the X9400YS24T1 have per potentiometer?

The X9400YS24T1 has four nonvolatile 6-bit Data Registers (DR0–DR3) per potentiometer, totaling 16 registers across the device. Each register retains wiper positions or system parameters for 100 years with 100,000 write cycles. DR0 is automatically loaded into the corresponding Wiper Counter Register (WCR) on power-up, enabling reliable configuration recovery without host intervention. This architecture is documented in the "Data Registers" and "Power-on recall" sections of the datasheet and is a defining feature of the X9400YS24T1.

Can the X9400YS24T1 be used as a two-terminal variable resistor?

Yes, the X9400YS24T1 can be configured as a two-terminal variable resistor by connecting either VH or VL to VW (wiper), leaving the other terminal open or grounded depending on application. The datasheet explicitly states this usage mode in the DESCRIPTION section and illustrates it in Application Circuits on page 16. Each potentiometer's 63-resistor array and CMOS switch structure supports both three-terminal potentiometer and two-terminal rheostat operation, with wiper resistance remaining ≤40 Ω at 5 V - ensuring minimal impact on circuit impedance.

What is the maximum SPI clock frequency supported by the X9400YS24T1?

The X9400YS24T1 supports a maximum SPI clock frequency of 2.0 MHz, as specified in the AC Timing table (fSCK parameter) on page 13 of FN8189 Rev 4.00. This limit applies to all instructions including reads, writes, transfers, and status queries. Timing parameters such as tSU (50 ns setup), tH (50 ns hold), and tCYC (500 ns cycle time) are guaranteed across the full industrial temperature range. Exceeding 2 MHz may result in unreliable communication or register corruption, and is not validated by Intersil's characterization.