Renesas X9258US24I-2.7T1

Overview

X9258US24I-2.7T1 from Intersil is a quad digital controlled potentiometer (XDCP™) integrating four 256-tap resistor arrays on a single CMOS IC, supporting ±2.7V to ±5.5V dual analog supplies and 2.7V–5.5V system supply. It implements volatile wiper counter registers and four nonvolatile data registers per potentiometer, with 40Ω typical wiper resistance at ±5V and <5µA standby current. It serves as precision programmable gain/offset adjustment in analog front-ends and sensor signal conditioning circuits.

For engineers reviewing the X9258US24I-2.7T1 datasheet, X9258US24I-2.7T1 pinout, X9258US24I-2.7T1 application, or X9258US24I-2.7T1 equivalent, key selection criteria include dual-supply rail-to-rail analog operation, 2-wire interface addressability (A0–A3), hardware write protection (WP), and guaranteed 100-year nonvolatile data retention across industrial temperature range (–40°C to +85°C).

Technical Context

The X9258US24I-2.7T1 uses four independent 255-element resistor arrays with CMOS switch-based wiper positioning controlled by an 8-bit Wiper Counter Register (WCR). Each array supports three-terminal potentiometer or two-terminal variable resistor configurations, with VH/RH and VL/RL pins referenced to V+ and V– respectively, enabling true bipolar signal handling.

Its 2-wire (I²C-compatible) interface operates up to 400kHz, with slave address formed by fixed 0101b type identifier and user-configurable A0–A3 bits. Nonvolatile writes require high-voltage cycle (tWR = 5–10ms), and power-up automatically loads DR0 into each WCR. WP pin disables nonvolatile register writes when asserted low.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), RoHS-compliant, Pb-free matte tin finish (e3 termination).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ100 and MCP42050-I/P, the X9258US24I-2.7T1 uniquely delivers quad-channel, bipolar-supply operation with nonvolatile storage-enabling compact, self-calibrating analog subsystems without external memory or level-shifters.

Availability

X9258US24I-2.7T1 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical instrumentation front-ends, and automated test equipment requiring stable component supply across extended temperature and long product lifecycles.

Supply support for X9258US24I-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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, aerospace, and medical applications.

The X9258 product line delivers digitally programmable analog functions with nonvolatile configuration storage, targeting applications demanding field-adjustable calibration, long-term parameter retention, and robust bipolar signal handling.

FAQ

What is the absolute maximum voltage rating for the V+ and V– pins of the X9258US24I-2.7T1?

The X9258US24I-2.7T1 specifies absolute maximum ratings of +10V on V+ and –10V on V–, with a maximum differential voltage (V+ – V–) of 12V. Exceeding these limits risks permanent damage. The recommended operating range remains ±2.7V to ±5.5V per the -2.7 suffix designation. Always ensure all three supplies (VCC, V+, V–) stabilize within 1ms of each other during power-up to prevent latch-up or undefined behavior in the X9258US24I-2.7T1.

Does the X9258US24I-2.7T1 support true I²C bus compliance, including clock stretching and multi-master arbitration?

The X9258US24I-2.7T1 implements a 2-wire serial interface compatible with I²C protocol timing (400kHz max, tHIGH ≥600ns), but it does not support clock stretching or multi-master arbitration. It operates strictly as a slave device with fixed 0101xxxxb address format and acknowledges only after valid start condition and address match. Host controllers must manage bus arbitration externally. This design simplifies integration in single-master systems like microcontroller-based calibration modules using the X9258US24I-2.7T1.

How does the hardware write protect (WP) pin function on the X9258US24I-2.7T1, and what happens if it's left floating?

The WP pin on the X9258US24I-2.7T1 is active-low: when pulled low, it disables all nonvolatile writes to the Data Registers (DR0–DR3), preventing accidental overwrites during firmware updates or noise events. If left floating, WP defaults to high (inactive) due to internal weak pull-up, allowing nonvolatile writes. For robust operation, tie WP to VCC (disable protection) or ground (enable protection) with a solid connection; avoid floating states to ensure predictable DR write behavior in the X9258US24I-2.7T1.

Can the X9258US24I-2.7T1 operate with only a single supply, or is dual V+/V– mandatory?

The X9258US24I-2.7T1 requires both V+ and V– supplies to operate its analog resistor arrays - they are not optional. However, V+ and V– may be configured as unipolar (e.g., V+ = +5V, V– = 0V) to emulate single-supply operation, provided the VH/VL pins remain within their respective rail limits. The datasheet confirms this flexibility, but true bipolar operation (e.g., ±3V) leverages the full specification of the X9258US24I-2.7T1, including rail-to-rail wiper swing and optimized wiper resistance.

What is the wiper response time for the X9258US24I-2.7T1 after issuing a Write Wiper Counter Register command?

After issuing a Write Wiper Counter Register command to the X9258US24I-2.7T1, the wiper settles to the new position within 10µs (tWRL), as specified in the DCP Timing table. This delay applies to all load instructions (Write WCR, XFR DR→WCR, Global XFR). The response is deterministic and independent of supply voltage within the 2.7V–5.5V range. No additional stabilization time is required before reading back the wiper position or using the adjusted resistance in the analog path of the X9258US24I-2.7T1.