Renesas X93154UU8IZ-3

Overview

X93154UU8IZ-3 from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 50kΩ end-to-end resistance with 32 wiper tap points, nonvolatile wiper position storage, and low-power CMOS operation at 3V ±10%. It functions as a two-terminal variable resistor for precision analog trimming in bias, gain, and LCD contrast circuits.

For engineers reviewing the X93154UU8IZ-3 datasheet, X93154UU8IZ-3 pinout, X93154UU8IZ-3 application, or X93154UU8IZ-3 equivalent, key selection criteria include its 1µA standby current, ±35ppm/°C RTOTAL temperature coefficient, 3-wire serial interface timing (tCYC = 2µs), and MSOP-8 package compatibility with industrial temperature range (-40°C to +85°C).

Technical Context

The X93154UU8IZ-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 active low, with direction controlled by U/D logic level.

Nonvolatile store occurs when CS rises high while INC is held high, initiating a 5–10ms EEPROM write cycle. Power-up automatically recalls the last stored wiper position, enabling preset analog configuration without host initialization.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (M8.118), RoHS-compliant, Pb-free, moisture sensitivity level per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5243BRMZ50 and MCP41050-I/P, the X93154UU8IZ-3 uniquely combines 3-wire simplicity, automatic power-up recall, and ultra-low 1µA standby-making it optimal for space-constrained, single-pot, battery-sensitive designs where minimal GPIO and zero-host-initialization are critical.

Availability

X93154UU8IZ-3 is available at Aetrix Electronics and suitable for LCD contrast control, analog sensor biasing, instrumentation amplifier gain setting, and micro-power signal conditioning requiring stable component supply and long-term calibration retention.

Supply support for X93154UU8IZ-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 industrial, computing, and communications markets.

The X93154 series belongs to Intersil's XDCP™ (eXternally Digitally Controlled Potentiometer) product line, engineered specifically for replacing mechanical potentiometers in analog trimming applications requiring nonvolatile memory, low power, and solid-state reliability.

FAQ

What is the maximum allowable VCC ramp rate for reliable operation of the X93154UU8IZ-3?

The X93154UU8IZ-3 requires a minimum VCC power-up ramp rate of 1.0 V/ms and a maximum of 50 V/ms. Exceeding these limits may cause improper initialization of the internal counter or nonvolatile memory circuitry, leading to unpredictable wiper position on power-up. This specification is verified per the FN8180 Rev 4.00 datasheet Section "Power-Up and Power-Down Requirements" and applies directly to the X93154UU8IZ-3.

Does the X93154UU8IZ-3 support true three-terminal potentiometer operation with a dedicated wiper output?

No, the X93154UU8IZ-3 operates exclusively as a two-terminal variable resistor. It has no dedicated wiper output pin-only RH and RL terminals. The wiper node is internal and inaccessible; resistance is adjusted between RH and RL. This architecture eliminates wiper contact resistance variation and simplifies layout but precludes traditional three-terminal potentiometer use cases requiring a movable center tap.

How is nonvolatile storage triggered on the X93154UU8IZ-3, and what is the timing requirement?

Nonvolatile storage on the X93154UU8IZ-3 is triggered by a rising edge on the CS pin while the INC pin is held HIGH. This initiates an internal EEPROM write cycle lasting 5–10ms (tWR). During this time, the device enters standby mode and ignores further INC or U/D inputs. The store operation is complete when CS returns low, and the wiper position is retained across subsequent power cycles.

What is the absolute maximum resistor current rating for the X93154UU8IZ-3, and how does it relate to RTOTAL?

The X93154UU8IZ-3 has an absolute maximum resistor current rating of 2mA. With RTOTAL = 50kΩ, this corresponds to a maximum allowable voltage drop of 100V across RH–RL-however, the terminal voltage limit is constrained to 0–VCC (3V), making the practical maximum current 60µA (3V ÷ 50kΩ). Exceeding 2mA risks permanent damage to the internal resistor array or switches, regardless of applied voltage.

Can the NC pin (Pin 5) of the X93154UU8IZ-3 be used as a functional signal or ground connection?

No, Pin 5 (NC) of the X93154UU8IZ-3 is internally unconnected and must not be used as a signal or ground path. It may be left floating or tied to any voltage between VSS and VCC without affecting operation-but it provides no electrical function, carries no current, and offers no ESD protection. Using it as a ground or signal node violates the M8.118 package design and risks undefined behavior per the FN8180 datasheet Pin Descriptions section.