Renesas X9241AYSIZT1

Overview

X9241AYSIZT1 from Intersil is a quad digital controlled potentiometer (XDCP™) IC integrating four independent 64-tap nonvolatile resistor arrays with 2-wire I²C-compatible interface, ±3.0V to +5V terminal voltage support, and cascading capability for combined resistance values up to 200kΩ. It functions as a digitally programmable analog adjustment element in precision biasing, gain control, and calibration circuits.

For engineers reviewing the X9241AYSIZT1 datasheet, X9241AYSIZT1 pinout, X9241AYSIZT1 application, or X9241AYSIZT1 equivalent, this device delivers deterministic wiper positioning via volatile WCR and four nonvolatile data registers per pot, supports power-up recall from DR0, and enables fine-grained tuning through increment/decrement commands on the SCL line.

Technical Context

The X9241AYSIZT1 implements four monolithic CMOS resistor arrays-each with 63 discrete segments and 64 tap points-controlled by individual 6-bit Wiper Counter Registers (WCR). Each WCR drives FET switches selecting one wiper position per array, with direct write, register transfer, and real-time increment/decrement modes.

It uses a standard 2-wire serial interface with fixed 0101xxxx slave address prefix and user-configurable A0–A3 pins. The device supports cascade mode via CM bit (bit 7 of WCR), enabling inter-array linking for extended resistance ranges, while DW bit (bit 6) disables wiper output to float the VW/RW terminal.

Key Specifications

Pinout & Package

20-lead SOIC package (RoHS-compliant, Pb-free matte tin finish), compatible with standard surface-mount reflow processes. Pin layout matches industry-standard 20-pin SOIC footprint with 0.3" body width.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42010-I/P, the X9241AYSIZT1 uniquely combines quad integration, 64-tap precision, nonvolatile register storage per pot, and hardware-supported cascade mode-enabling compact, self-contained analog trimming without external memory or discrete component stacking.

Availability

X9241AYSIZT1 is available at Aetrix Electronics and suitable for laser diode bias control, audio channel gain trimming, industrial sensor calibration, and power supply reference adjustment requiring stable component supply across commercial and industrial temperature ranges.

Supply support for X9241AYSIZT1 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 provider of precision analog and power management ICs, with expertise in high-reliability industrial, infrastructure, and communications solutions.

The X9241A family was designed for digitally programmable analog signal conditioning in systems requiring field-calibratable, nonvolatile resistance adjustment without mechanical wear or manual intervention.

FAQ

What is the resistance value per potentiometer in the X9241AYSIZT1?

The X9241AYSIZT1 is configured with 2kΩ end-to-end resistance per potentiometer, as confirmed in the Ordering Information table for the X9241AY-series variants. This value is fixed per device variant and cannot be altered post-manufacture. The 2kΩ arrays support cascading to achieve higher effective resistances, and their low value minimizes thermal noise and parasitic capacitance in precision analog paths. All four pots in the X9241AYSIZT1 share this identical 2kΩ rating.

Does the X9241AYSIZT1 retain wiper settings after power loss?

Yes, the X9241AYSIZT1 retains wiper settings after power loss via its nonvolatile Data Registers (DR0–DR3), each storing a 6-bit wiper position with 100-year data retention. On power-up, the contents of DR0 are automatically loaded into the volatile Wiper Counter Register (WCR) to restore the last-saved position. To preserve a specific wiper state, users must explicitly issue a "XFR WCR to Data Register" command before power-down; DR0 is not updated automatically during runtime.

Can the X9241AYSIZT1 be used in cascade mode, and how is it enabled?

Yes, the X9241AYSIZT1 supports cascade mode to link resistor arrays for extended resistance values (e.g., 4kΩ to 200kΩ). Cascade mode is enabled by setting the CM bit (bit 7) of the target pot's Wiper Counter Register to '1'-for example, setting bit 7 of WCR2 cascades POT2 to POT3. External wiring must connect VL/RL of the higher-order pot to VH/RH of the lower-order pot, and only one wiper may remain enabled (DW bit = 0) in the chain. The feature is fully supported in the X9241AYSIZT1's silicon implementation.

What is the maximum allowable voltage on the VH, VL, and VW pins of the X9241AYSIZT1?

The X9241AYSIZT1 specifies a terminal voltage range of −3.0V to +5V on all VH/RH, VL/RL, and VW/RW pins, referenced to VSS. This allows bipolar operation (e.g., −3V to +5V swing = 8V ΔV) and supports use with dual-supply op-amps or negative-biased sensor interfaces. Exceeding these limits risks latch-up or permanent damage. The absolute maximum rating for ΔV = |VH − VL| is 10V, but operation within the −3.0V to +5V window ensures guaranteed functionality and reliability per datasheet specifications.

How does the increment/decrement function work on the X9241AYSIZT1?

The increment/decrement function allows real-time, clock-synchronized wiper adjustment without issuing full register writes. After sending the "Increment/Decrement Wiper" command, the host holds SDA HIGH to move the selected wiper toward VH/RH (one segment per SCL pulse), or LOW to move toward VL/RL. Each transition occurs within tCLWV (≤1000 µs) after SCL falls. This mode is ideal for closed-loop tuning, manual knob emulation, or fine-grained calibration-reducing I²C bus overhead versus repeated Write WCR commands. The X9241AYSIZT1 fully implements this feature per the FN8164 Rev 7.00 specification.