Renesas X9400YV24

Overview

X9400YV24 from Intersil is a quad digitally controlled potentiometer (XDCP™) implementing four independent 64-tap resistor arrays with SPI interface, 10 kΩ end-to-end resistance, ±5 V analog voltage range (V+/V−), and nonvolatile wiper position storage. It functions as a programmable three-terminal potentiometer or two-terminal variable resistor in precision analog signal conditioning circuits.

For engineers reviewing the X9400YV24 datasheet, X9400YV24 pinout, X9400YV24 application, or X9400YV24 equivalent, this device supports low-noise (<−120 dBV), low-power (standby current <1 µA), and high-reliability (100-year data retention, 100,000 write cycles) operation across industrial temperature range (−40°C to +85°C) in TSSOP-24 packaging.

Technical Context

The X9400YV24 integrates four monolithic CMOS resistor arrays, each with 63 resistive segments and 64 tap points controlled by a 6-bit Wiper Counter Register (WCR). Each array features dedicated VH/RH, VL/RL, and VW/RW terminals, enabling independent three-terminal potentiometer or two-terminal rheostat configurations.

It implements full SPI-protocol compatibility-including CS, SCK, SI, SO, HOLD, and WP-with device addressing via A0/A1 pins, hardware write protection, and power-on recall of DR0 contents to all WCRs. Internal nonvolatile writes require up to 10 ms and are confirmed via WIP bit polling.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm width), RoHS-compliant Pb-free plus anneal finish, MDP0044 package drawing.

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/SL, the X9400YV24 uniquely delivers ±5 V analog rail independence, hardware write protection, and guaranteed power-on DR0 recall-making it the only option for robust, field-calibrated, bipolar analog systems requiring long-term data integrity.

Availability

X9400YV24 is available at Aetrix Electronics and suitable for industrial sensor calibration, optical module biasing, programmable reference generation, and audio signal processing requiring stable component supply across extended temperature and voltage ranges.

Supply support for X9400YV24 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 X9400 family was designed specifically for digitally programmable analog trimming in harsh environments-emphasizing nonvolatile retention, wide analog voltage tolerance, and robust SPI command architecture for mission-critical calibration tasks.

FAQ

What is the absolute maximum analog voltage range supported by the X9400YV24?

The X9400YV24 supports V+ from −5.5 V to +5.5 V and V− from −5.5 V to −2.7 V, enabling true ±5 V analog signal handling independent of the 2.7–5.5 V VCC supply. This allows direct connection to op-amps and ADCs operating outside the digital supply domain-critical for bipolar signal chains. Exceeding these limits risks permanent damage per Absolute Maximum Ratings.

How does the X9400YV24 handle power-up wiper initialization?

The X9400YV24 automatically loads the contents of Data Register 0 (DR0) into each Wiper Counter Register (WCR) on power-up, ensuring repeatable startup behavior. This recall function requires correct power sequencing: VCC must stabilize first, followed by V+ and V−, with no glitches >100 mV on VCC. If VCC drops below 0.1 V for >1 second before restart, recall is guaranteed.

Can the X9400YV24 be used as a two-terminal variable resistor?

Yes, the X9400YV24 supports two-terminal (rheostat) operation by connecting either VHx or VLx to VWx and using the remaining terminal with the other fixed end. This configuration is explicitly validated in the datasheet's Application Circuits section and maintains full 64-tap resolution and nonvolatile storage-ideal for programmable current limiting or LED brightness control.

What is the purpose of the HOLD pin on the X9400YV24?

The HOLD pin pauses ongoing SPI communication without resetting the command sequence. To use it, HOLD must be driven LOW while SCK is LOW; resuming requires driving HOLD HIGH while SCK remains LOW. This feature enables time-critical MCU interrupts or bus arbitration without losing context-unlike CS deassertion, which aborts the transaction.

Does the X9400YV24 support daisy-chaining multiple devices on one SPI bus?

No, the X9400YV24 does not support daisy-chaining. It uses standard SPI with individual CS lines. However, up to four units can share one SPI bus using hardware addressing via A0/A1 pins and independent CS signals-enabling compact multi-pot systems without additional logic. Each device responds only when its 2-bit address matches the ID byte.