Renesas X9400YS24I

Overview

X9400YS24I from Intersil is a quad digitally controlled potentiometer (XDCP™) integrating four independent 64-tap resistor arrays with SPI interface, nonvolatile data registers, and power-on wiper recall. It operates from 2.7V to 5.5V VCC, supports ±5V analog rails (V+/V−), and delivers 40Ω typical wiper resistance at 5V - used for precision voltage divider tuning in programmable gain amplifiers and sensor calibration circuits.

For engineers reviewing the X9400YS24I datasheet, X9400YS24I pinout, X9400YS24I application, or X9400YS24I equivalent, this device enables digital replacement of mechanical pots in closed-loop control systems requiring stable wiper position retention, low-noise analog adjustment, and multi-channel parameter trimming without external EEPROM.

Technical Context

The X9400YS24I 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 supporting 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 capability via HOLD. Nonvolatile storage includes four 6-bit Data Registers per potentiometer, with automatic DR0-to-WCR load on power-up and 10ms max internal write time.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), RoHS-compliant Pb-free plus anneal finish.

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 X9400YS24I uniquely combines quad-channel density, ±5.5V analog operation, hardware write protection, and true nonvolatile wiper recall - making it optimal for industrial sensor interfaces and programmable analog front-ends demanding reliability and bipolar signal support.

Availability

X9400YS24I is available at Aetrix Electronics and suitable for programmable gain amplifiers, sensor calibration systems, voltage regulator feedback networks, and comparator hysteresis control requiring stable component supply and long-term configuration retention.

Supply support for X9400YS24I 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 is a precision analog and power management semiconductor company, now part of Renesas Electronics, with expertise in high-reliability industrial and infrastructure solutions.

The X9400YS24I belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in automated test equipment, medical instrumentation, and programmable power supplies.

FAQ

What is the maximum SPI clock frequency supported by the X9400YS24I?

The X9400YS24I supports an SPI clock frequency up to 2.0 MHz, as specified in its AC timing characteristics. This allows fast wiper updates and register transfers while maintaining reliable communication with microcontrollers and FPGAs. The device requires minimum setup and hold times of 50 ns for all SPI inputs, and valid SO output appears within 100 ns after clock edge. Exceeding 2 MHz may cause read/write failures or incomplete internal write cycles.

Does the X9400YS24I retain wiper position after power cycling?

Yes, the X9400YS24I automatically loads the contents of Data Register 0 (DR0) into the Wiper Counter Register (WCR) on power-up, ensuring the last-saved wiper position is restored. This recall function requires correct power sequencing: VCC must ramp first, followed by V+ and V−. If VCC drops below 0.1V for more than 1 second before re-powering, full recall is guaranteed. DR0 itself retains data for 100 years without power.

Can the X9400YS24I be used with bipolar analog signals?

Yes, the X9400YS24I supports true bipolar operation with analog supply rails V+ = +5.5V and V− = −5.5V, enabling use with signals ranging from −5.5V to +5.5V across all four potentiometer channels. This makes it suitable for audio circuits, industrial transducer interfaces, and op-amp configurations requiring negative reference voltages - unlike many digital pots limited to 0–VCC unipolar ranges.

How many nonvolatile settings can be stored per potentiometer in the X9400YS24I?

Each of the four potentiometers in the X9400YS24I has four independent 6-bit nonvolatile Data Registers (DR0–DR3), allowing up to four distinct wiper positions to be stored per channel. These registers can be individually written, read, or transferred to the volatile Wiper Counter Register using SPI commands. All nonvolatile writes complete within 10 ms and survive 100,000 write cycles and 100 years of storage.

Is hardware write protection available on the X9400YS24I?

Yes, the X9400YS24I includes a dedicated hardware write protect (WP) pin. When WP is driven LOW, all nonvolatile write operations to the Data Registers are disabled - preventing accidental overwrites of calibrated settings during system operation or firmware updates. WP has no effect on volatile WCR writes or SPI read operations, and it functions independently of CS or HOLD states.