Renesas X9259US24ZT1

Overview

X9259US24ZT1 from Intersil (now Renesas) is a quad digitally controlled potentiometer (XDCP™) IC integrating four independent 256-tap, 50kΩ end-to-end resistance DCPs on a single CMOS die. It operates from 2.7V to 5.5V, features 2-wire serial interface, nonvolatile data registers, and <5µA standby current - used for precision gain control, DC bias trimming, and programmable reference generation in analog signal chains.

For engineers reviewing the X9259US24ZT1 datasheet, X9259US24ZT1 pinout, X9259US24ZT1 application, or X9259US24ZT1 equivalent, key selection criteria include 256-step resolution (0.4%), wiper resistance (220Ω typ. at 5V), 4× nonvolatile DRs per channel, hardware write-protect (WP), and SOIC-24 package compatibility with industrial temperature range (0°C to +70°C).

Technical Context

The X9259US24ZT1 implements each of its four DCPs as a resistor ladder with CMOS switch matrix, controlled by an 8-bit volatile Wiper Counter Register (WCR). Wiper position is updated via 2-wire bus commands including direct WCR write, DR-to-WCR transfer, or real-time increment/decrement mode.

Each DCP has four nonvolatile Data Registers (DR0–DR3) supporting persistent storage of up to four distinct wiper positions per channel. At power-up, DR0 values are automatically loaded into corresponding WCRs. The WP pin enables hardware-level protection against unintended nonvolatile writes.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (RoHS-compliant, M24.3 drawing), body width 7.5mm, standard JEDEC MS-013 footprint.

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 X9259US24ZT1 uniquely combines I²C compatibility, hardware write-protection, and guaranteed 100-year nonvolatile data retention - making it optimal for field-deployed systems requiring unattended recalibration and tamper-resistant analog configuration.

Availability

X9259US24ZT1 is available at Aetrix Electronics and suitable for audio volume control, DC bias trimming, voltage regulator setpoint programming, filter gain adjustment, and sensor signal conditioning requiring stable component supply and long-lifecycle support.

Supply support for X9259US24ZT1 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 (acquired by Renesas Electronics in 2017) is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9259 product line delivers digitally programmable analog front-ends for embedded systems requiring recalibratable, nonvolatile resistance control - targeting industrial instrumentation, medical devices, and communications infrastructure.

FAQ

What is the operating voltage range for the X9259US24ZT1?

The X9259US24ZT1 operates from 2.7V to 5.5V, supporting both legacy 5V systems and modern low-voltage designs. Its internal circuitry is optimized for stable performance across this range, with specified wiper resistance (220Ω typ. at 5V) and standby current (<5µA) validated at VCC = 5V ±10%. The device meets absolute maximum ratings up to 7V on all pins relative to VSS.

How many nonvolatile data registers does the X9259US24ZT1 provide per potentiometer?

The X9259US24ZT1 provides four 8-bit nonvolatile Data Registers (DR0–DR3) for each of its four DCPs. These registers retain wiper positions or system parameters for 100 years and support up to 100,000 write cycles per bit. At power-up, DR0 values are automatically loaded into the corresponding volatile Wiper Counter Registers (WCRs), ensuring repeatable analog initialization without host intervention.

Does the X9259US24ZT1 support I²C-compatible communication?

Yes, the X9259US24ZT1 implements a standard 2-wire serial interface fully compatible with I²C protocol conventions, including START/STOP conditions, ACK/NACK handshaking, and 7-bit addressing (with 4-bit user-configurable address via A0–A3). It supports 400kHz maximum clock frequency and open-drain SDA with external pull-up - interoperable with standard I²C masters without protocol translation.

What is the resolution and end-to-end resistance of the X9259US24ZT1 potentiometers?

Each of the four potentiometers in the X9259US24ZT1 offers 256-tap resolution (0.4% step size) with a nominal end-to-end resistance (RTOTAL) of 50kΩ ±20%. This resolution enables precise analog tuning in applications such as gain control and offset trimming, while the 50kΩ value balances low thermal noise with sufficient current drive capability for typical op-amp feedback networks.

Can the X9259US24ZT1 be used as a two-terminal variable resistor?

Yes, the X9259US24ZT1 can be configured as a two-terminal variable resistor by connecting either RH or RL to the wiper (RW) externally, effectively using only two of the three terminals per DCP. This mode is explicitly supported in the datasheet and maintains the same 256-step resolution and nonvolatile storage capability - commonly applied in current-source programming and LED brightness control circuits.