Renesas X9268US24Z

Overview

X9268US24Z from Intersil is a dual digitally controlled potentiometer (XDCP™) with 256-tap resolution per channel, 2-wire serial interface, and nonvolatile wiper position storage. It delivers ±0.4% resolution, 50kΩ end-to-end resistance, and operates from dual analog supplies (±2.7V to ±5.5V) for precision biasing and gain control in audio, sensor conditioning, and voltage regulation circuits.

For engineers reviewing the X9268US24Z datasheet, X9268US24Z pinout, X9268US24Z application, or X9268US24Z equivalent, this device supports power-on recall of stored wiper positions, hardware write protection (WP), and fine-grained increment/decrement control via SCL/SDA-critical for embedded trimming, programmable reference generation, and closed-loop calibration systems.

Technical Context

The X9268US24Z integrates two independent 255-segment resistor arrays with CMOS wiper switches controlled by 8-bit volatile Wiper Counter Registers (WCR). Each potentiometer has four 8-bit nonvolatile Data Registers (DR0–DR3) enabling persistent storage of up to four distinct wiper positions per channel.

Its 2-wire bus interface implements full read/write/transfer operations-including global register transfers-and supports ACK polling during nonvolatile writes (t_WR ≤ 10 ms). The device requires synchronized ramp-up of VCC, V+, and V− within 1 ms and enforces strict voltage limits on RH/RL/RW pins relative to V+ and V−.

Key Specifications

Pinout & Package

24-pin SOIC (300 mil, Pb-free), RoHS compliant. Pin 1 is NC; pins 6 (V+), 7 (VCC), 18 (VSS), and 19 (V−) provide separate analog and system supply connections. Hardware write protect (WP) is active-low on pin 12.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42050-I/P, the X9268US24Z uniquely supports true bipolar analog operation with isolated V+/V− rails, hardware write protection, and power-on recall-making it the only option for precision trimming in AC-coupled, dual-supply, or high-reliability industrial systems.

Availability

X9268US24Z is available at Aetrix Electronics and suitable for audio equipment manufacturing, sensor calibration systems, programmable power supplies, and RF transceiver design requiring stable component supply and long-term obsolescence management.

Supply support for X9268US24Z 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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X9268US24Z belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in automated calibration, adaptive biasing, and programmable analog signal chains.

FAQ

What is the maximum allowable voltage difference between V+ and V− for the X9268US24Z?

The X9268US24Z specifies an absolute maximum (V+) − (V−) rating of 12 V. Operation beyond this limit risks permanent damage to the internal CMOS switches. For reliable function, maintain V+ and V− within their respective recommended ranges (+2.7V to +5.5V and −2.7V to −5.5V), ensuring the total differential remains ≤12 V. This constraint directly governs the safe voltage swing across RH/RL/RW terminals.

Does the X9268US24Z support true I²C communication, including repeated START conditions?

Yes, the X9268US24Z fully complies with standard-mode I²C protocol: it recognizes START/STOP conditions, responds to its 7-bit slave address (0x50–0x57 based on A3–A0), and implements ACK/NACK handshaking. Its instruction set uses three-byte sequences (e.g., Read WCR) that rely on repeated START for multi-step transfers. However, it does not support clock stretching or 10-bit addressing.

How many distinct wiper positions can be stored nonvolatily for each potentiometer in the X9268US24Z?

Each potentiometer in the X9268US24Z has four dedicated 8-bit nonvolatile Data Registers (DR0–DR3), allowing storage of four independent wiper positions per channel. These registers retain values for 100 years and withstand 100,000 write cycles. DR0 is automatically loaded into the Wiper Counter Register (WCR) at power-up, enabling default configuration without host intervention.

Can the X9268US24Z be used with a single 5V supply instead of dual ±5V rails?

No-the X9268US24Z requires separate V+ and V− analog supplies to bias its internal CMOS wiper switches. While VCC may be +5V, V+ must be ≥ +2.7V and V− ≤ −2.7V for guaranteed operation. Using only a single 5V supply (with V− tied to GND) violates the absolute maximum rating for V− and will prevent proper wiper switching or cause functional failure.

What is the purpose of the NC pins (1, 3, 4, 5, 20, 21, 22) on the X9268US24Z SOIC package?

The NC pins on the X9268US24Z are designated "No Connect" and must remain unconnected-neither tied to VCC, GND, nor left floating. They serve internal manufacturing and test purposes at Intersil and have no electrical function in end-user circuits. Connecting them risks unintended current paths or latch-up due to undefined internal node coupling.