Renesas X93154UM8IZ-3

Overview

X93154UM8IZ-3 from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 32-tap, 50kΩ solid-state variable resistor with nonvolatile wiper position storage. It operates from 3V ±10%, draws ≤250µA active current and ≤1µA standby current, and functions as a two-terminal adjustable resistor for precision analog trimming in industrial temperature range (−40°C to +85°C).

For engineers reviewing the X93154UM8IZ-3 datasheet, X93154UM8IZ-3 pinout, X93154UM8IZ-3 application, or X93154UM8IZ-3 equivalent, key selection criteria include its 3-wire serial interface (CS/U/D/INC), ±30% end-to-end resistance tolerance, −120dBV noise performance, 200,000-cycle endurance, and MSOP-8 package compatibility with space-constrained analog control circuits.

Technical Context

The X93154UM8IZ-3 integrates a 31-element resistor array, 5-bit up/down counter, nonvolatile EEPROM memory, and transfer gate decoding logic. Wiper position is updated on negative-edge transitions of INC while CS is low, with direction controlled by U/D logic level.

Stored wiper values are recalled automatically at power-up when CS is held high during VCC ramp-up. The device supports both volatile adjustment and persistent trim retention, with store operations requiring CS rising edge concurrent with INC high and completing within 5–10ms.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (M8.118), RoHS-compliant, 3.0mm × 3.0mm body, 0.65mm pitch, thermal pad optional.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5243BRMZ50 and MCP4551T-503E/MS, the X93154UM8IZ-3 uniquely combines 3-wire simplicity, guaranteed nonvolatile recall at power-up, and −120dBV noise in an industry-standard 8-lead MSOP-making it optimal for standalone, low-noise, maintenance-free analog trimming where I²C overhead or external initialization is undesirable.

Availability

X93154UM8IZ-3 is available at Aetrix Electronics and suitable for LCD contrast control, instrumentation amplifier gain trim, and power supply bias adjustment requiring stable component supply, long-term calibration retention, and low-noise analog performance.

Supply support for X93154UM8IZ-3 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 (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X93154UM8IZ-3 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, engineered specifically for replacing mechanical trimpots in industrial, medical, and test equipment where reliability, recalibration flexibility, and zero-maintenance analog tuning are required.

FAQ

What is the maximum allowable voltage on RH and RL pins of the X93154UM8IZ-3?

The RH and RL pins of the X93154UM8IZ-3 accept voltages from VSS to VCC only. Absolute maximum rating is −1V to +6.5V with respect to VSS, but operational use must stay within 0V to VCC (3V ±10%). Exceeding VCC risks damaging the internal transfer gates and invalidating the ±30% RTOTAL tolerance specification. The X93154UM8IZ-3 is not rated for rail-to-rail operation beyond its supply rails.

Does the X93154UM8IZ-3 require external components to operate as a two-terminal variable resistor?

No, the X93154UM8IZ-3 operates as a self-contained two-terminal variable resistor with no external passive components required. RH and RL connect directly to circuit nodes defining the resistance path; VCC, VSS, CS, U/D, and INC interface to digital control lines. The internal 30kΩ pull-up on CS allows floating CS for default-high (standby) operation, eliminating need for external bias resistors in basic configurations.

How does the X93154UM8IZ-3 handle power-up wiper initialization?

The X93154UM8IZ-3 recalls the last stored wiper position from nonvolatile memory automatically at power-up-but only if CS is held high during VCC ramp-up. If CS is low or floating during startup, the wiper defaults to position 0 (RH–RL short). This behavior is explicitly defined in the FN8180 datasheet and ensures deterministic initialization without MCU intervention when properly wired, making the X93154UM8IZ-3 ideal for "set-and-forget" analog calibration.

Can the X93154UM8IZ-3 be used in a three-terminal potentiometer configuration?

No-the X93154UM8IZ-3 is designed exclusively as a two-terminal variable resistor. Its internal architecture connects only one wiper terminal (VW is not exposed); RH and RL are the only resistive endpoints. Unlike traditional potentiometers, it lacks a dedicated wiper output pin. All applications must treat it as a digitally adjustable series resistance between RH and RL, as confirmed by the block diagram, pin descriptions, and Figure 1 in the FN8180 datasheet.

What is the minimum INC pulse width required for reliable wiper movement in the X93154UM8IZ-3?

The X93154UM8IZ-3 requires a minimum INC HIGH period (t_lH) of 1µs and a minimum INC LOW period (t_lL) of 1µs, per the AC Electrical Specifications table on page 4 of FN8180 Rev 4.00. The INC input is negative-edge triggered, so pulse width compliance ensures proper clocking of the 5-bit counter. Violating these timing constraints may result in missed steps or metastability, especially at temperature extremes where t_lH/t_lL margins shrink.