Renesas X9258TS24IZ-2.7T1

Overview

X9258TS24IZ-2.7T1 from Intersil (now Renesas) is a quad digital potentiometer IC with 256-tap resolution per channel, dual ±2.7V to ±5.5V analog supplies, 2-wire I²C-compatible interface, and nonvolatile wiper position storage. It functions as four independent digitally controlled variable resistors in a single SOIC-24 package, used for precision gain/offset trimming in industrial sensor signal conditioning circuits.

For engineers reviewing the X9258TS24IZ-2.7T1 datasheet, X9258TS24IZ-2.7T1 pinout, X9258TS24IZ-2.7T1 application, or X9258TS24IZ-2.7T1 equivalent, key selection criteria include its 100kΩ end-to-end resistance, -40°C to +85°C operating range, hardware write-protect (WP) pin, and support for volatile wiper updates and nonvolatile register writes via I²C.

Technical Context

The X9258TS24IZ-2.7T1 implements four independent resistor arrays, each with 255 segments and 256 tap points controlled by an 8-bit volatile Wiper Counter Register (WCR). Each array has dedicated VH/RH, VL/RL, and VW/RW terminals, enabling three-terminal potentiometer or two-terminal rheostat configurations.

It uses a 2-wire serial interface with slave address format 0101[A3:A0], supports up to 16 devices on one bus, and features four nonvolatile data registers (DR0–DR3) per potentiometer for storing wiper positions or system parameters. Power-up loads DR0 into the WCR, and WP pin disables nonvolatile writes when low.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), RoHS-compliant, Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ100 and MCP42050-I/P, the X9258TS24IZ-2.7T1 uniquely supports true bipolar analog operation with dedicated V+/V− rails and hardware write protection-critical for precision industrial signal conditioning where supply separation and fault immunity are mandatory.

Availability

X9258TS24IZ-2.7T1 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifier design, and bipolar DC bias adjustment requiring stable component supply across extended temperature and long product lifecycles.

Supply support for X9258TS24IZ-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 (acquired by Renesas Electronics in 2017) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for industrial, aerospace, and communications markets.

The X9258 product line was designed specifically for precision analog trimming in harsh-environment applications, emphasizing nonvolatile configuration retention, bipolar supply tolerance, and robust I²C communication under electrical noise.

FAQ

What is the absolute maximum voltage rating for the V+ and V− pins of the X9258TS24IZ-2.7T1?

The X9258TS24IZ-2.7T1 supports absolute maximum ratings of +10V on V+ and −10V on V−, with a maximum differential voltage (V+ − V−) of 12V. These limits ensure safe operation during transient overvoltage events in industrial environments, though recommended operating range remains ±2.7V to ±5.5V per the datasheet. Exceeding these absolute maxima may cause permanent damage to the internal resistor arrays or switches.

Does the X9258TS24IZ-2.7T1 support true I²C compliance, including clock stretching and arbitration?

The X9258TS24IZ-2.7T1 implements a 2-wire serial interface compatible with I²C protocol timing (400kHz max), but it does not support clock stretching or multi-master arbitration. It operates strictly as a slave device with fixed 8-bit addressing (0101xxxx). Host controllers must manage bus contention externally, and timing-critical sequences like nonvolatile writes require ACK polling instead of stretch-based synchronization.

How does the hardware write-protect (WP) pin function on the X9258TS24IZ-2.7T1, and what happens when it is left floating?

On the X9258TS24IZ-2.7T1, the WP pin must be actively driven low to disable nonvolatile writes to data registers; when high (or pulled up), writes are enabled. Leaving WP floating is undefined and risks unintended writes due to noise coupling-Renesas recommends tying WP to VCC through a 10kΩ resistor for default-enable operation or to VSS for permanent lockout. The pin has CMOS input structure with no internal pull-up/down.

Can the X9258TS24IZ-2.7T1 be used in a single-supply configuration, and what are the limitations?

Yes, the X9258TS24IZ-2.7T1 can operate with V− tied to VSS (0V) and V+ connected to a positive supply up to +5.5V, effectively creating a unipolar 0V to +5.5V analog range. However, this eliminates true bipolar operation, restricts use cases to single-ended signal paths, and reduces headroom for op-amp output swing. The wiper voltage range becomes 0V to V+, and RH/RL terminal voltage limits shift accordingly.

What is the wiper response time for the X9258TS24IZ-2.7T1 after issuing a Write Wiper Counter Register command?

After issuing a Write Wiper Counter Register command, the X9258TS24IZ-2.7T1 achieves stable wiper voltage within 10µs (tWRL), as specified in the DCP Timing table. This delay reflects internal decoding and switch settling-not propagation through external circuitry. For increment/decrement commands, response is similarly 10µs per step (tWRID), enabling real-time interactive adjustment synchronized to SCL edges.