Renesas X9400YV24I-2.7T1

Overview

X9400YV24I-2.7T1 from Intersil is a quad digitally controlled potentiometer (XDCP™) with 64-tap resolution per channel, SPI serial interface, and nonvolatile wiper position storage. It operates from 2.7V to 5.5V VCC, supports ±5V analog rails (V+/V−), and delivers 40Ω typical wiper resistance at 5V. Used in precision voltage divider and gain-setting circuits for industrial sensor conditioning and programmable power supply feedback loops.

For engineers reviewing the X9400YV24I-2.7T1 datasheet, X9400YV24I-2.7T1 pinout, X9400YV24I-2.7T1 application, or X9400YV24I-2.7T1 equivalent, this page provides verified electrical parameters, SPI timing constraints, wiper register behavior, nonvolatile data retention (100 years), and TSSOP-24 package–specific layout guidance - all confirmed against FN8189 Rev 4.00.

Technical Context

The X9400YV24I-2.7T1 integrates four independent 63-segment resistor arrays, each controlled by a volatile 6-bit Wiper Counter Register (WCR) and four nonvolatile 6-bit Data Registers (DR0–DR3). Wiper position is updated via SPI write, transfer, or real-time increment/decrement commands, with sub-microsecond response (tWRID = 450 ns) during active adjustment.

It implements full SPI Mode 0 (CPOL = 0, CPHA = 0) with CS-active-low selection, SO push-pull output, and hardware write protection via WP pin. Analog section isolation allows operation with V+ = +5.5V and V− = −5.5V while digital core runs at 2.7–5.5V - enabling bipolar signal conditioning without level-shifting.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm width), RoHS-compliant, Pb-free plus anneal finish (MDP0044 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 X9400YV24I-2.7T1 uniquely supports true bipolar analog operation (±5.5V), offers lower wiper resistance (40Ω), and guarantees 100-year data retention - making it the only option for industrial and medical systems requiring long-term calibration integrity and wide-swing signal conditioning.

Availability

X9400YV24I-2.7T1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, programmable power supplies, audio channel balancing, and medical instrument calibration requiring stable component supply and long-term calibration traceability.

Supply support for X9400YV24I-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 Corporation is a precision analog and power management IC specialist, now part of Renesas Electronics, with deep expertise in configurable mixed-signal solutions for industrial and medical markets.

The X9400 family was designed specifically for replacing mechanical potentiometers in high-reliability, calibration-critical systems - emphasizing nonvolatile storage integrity, bipolar analog compatibility, and SPI-controlled precision trimming.

FAQ

What is the absolute maximum analog voltage range supported by the X9400YV24I-2.7T1?

The X9400YV24I-2.7T1 supports V+ up to +5.5V and V− down to −5.5V, with (V+) − (V−) ≤ 12V. This allows direct use in ±5V op-amp circuits without level shifters. Exceeding these limits risks permanent damage per Absolute Maximum Ratings on page 11 of FN8189 Rev 4.00. The X9400YV24I-2.7T1 must never see voltage on VH/VL pins outside the V− to V+ range.

How does power-on recall work for the X9400YV24I-2.7T1, and what sequencing is required?

On power-up, the X9400YV24I-2.7T1 automatically loads the contents of Data Register 0 (DR0) into each channel's volatile Wiper Counter Register (WCR), restoring the last-saved wiper position. To ensure reliable recall, VCC must ramp monotonically at 0.2–50 V/msec, reach stability first, then V+ and V−, and no signal should be applied to VH/VL pins before V+ and V− are stable. The X9400YV24I-2.7T1 requires VCC to drop below 0.1V for >1 second before next power cycle.

Can the X9400YV24I-2.7T1 be used as a two-terminal variable resistor, and how is it configured?

Yes - the X9400YV24I-2.7T1 supports two-terminal operation by connecting either VH or VL to circuit ground (or common rail) and using VW as the adjustable terminal. For example, tying VLx to VSS and using VHx and VWx forms a variable resistor from VHx to VWx. The X9400YV24I-2.7T1 maintains 40Ω typical wiper resistance in this mode, and total resistance remains 10kΩ ±20% between VHx and VLx regardless of wiper position.

What is the purpose of the HOLD pin on the X9400YV24I-2.7T1, and how is it used in practice?

The HOLD pin pauses an ongoing SPI transaction without resetting the internal state - useful when the host MCU must service a higher-priority interrupt mid-transfer. To pause, bring HOLD LOW while SCK is LOW; to resume, return HOLD HIGH while SCK remains LOW. If unused, HOLD must be tied HIGH. The X9400YV24I-2.7T1 ignores HOLD state unless CS is active (LOW), and improper timing (e.g., changing HOLD during SCK HIGH) may corrupt the command sequence.

Does the X9400YV24I-2.7T1 support daisy-chaining multiple devices on a single SPI bus?

No - the X9400YV24I-2.7T1 does not support daisy-chaining. Each device requires its own dedicated CS line because the SO pin is push-pull (not open-drain), and there is no hardware mechanism to forward data to the next device. However, up to four X9400YV24I-2.7T1 units can share SCK, SI, and SO lines using unique A0/A1 address combinations and individual CS signals - reducing MCU pin count while maintaining independent control.