Renesas X93155UM8IZT1

Overview

X93155UM8IZT1 from Intersil is a digitally controlled potentiometer (XDCP™) configured as a two-terminal variable resistor with 32 wiper tap points, 50 kΩ end-to-end resistance, nonvolatile EEPROM storage for power-up recall, and 3-wire up/down interface. It operates from 4.5 V to 5.5 V, draws 200 µA active current, and is used in LCD contrast adjustment and analog bias/gain trimming circuits.

For engineers reviewing the X93155UM8IZT1 datasheet, X93155UM8IZT1 pinout, X93155UM8IZT1 application, or X93155UM8IZT1 equivalent, key selection criteria include its MSOP-8 package, ±25% RTOTAL tolerance, 200,000-cycle endurance, -40°C to +85°C industrial temperature range, and compatibility with low-power microcontroller GPIOs via CS/U/D/INC control signals.

Technical Context

The X93155UM8IZT1 implements a 31-element resistor ladder with a digitally controlled wiper driven by a 5-bit up/down counter and decoded switch matrix. Wiper position is stored in nonvolatile memory upon CS↑ while INC = HIGH, enabling deterministic power-up behavior without external configuration.

Its operation requires no clock signal beyond edge-triggered INC pulses; direction is set statically via U/D logic level during CS activation. The device supports terminal voltages from VSS to VCC, exhibits ±35 ppm/°C RTOTAL temperature coefficient, and maintains <2 µA standby current when deselected.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (M8.118), RoHS-compliant Pb-free, 3.0 mm × 4.9 mm footprint, 0.65 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5175BRMZ-50 and MCP41050-I/P, the X93155UM8IZT1 offers simpler GPIO-driven control, lower active current, and guaranteed power-up wiper recall without host initialization-making it optimal for cost-sensitive, low-power, single-potentiometer trim applications.

Availability

X93155UM8IZT1 is available at Aetrix Electronics and suitable for LCD contrast control, analog gain trimming, and bias voltage adjustment requiring stable component supply, long-term calibration retention, and industrial temperature operation.

Supply support for X93155UM8IZT1 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 power management ICs for industrial, computing, and communications markets.

The X93155UM8IZT1 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, engineered to replace mechanical trimmers in precision analog adjustment applications where reliability, programmability, and nonvolatile setting retention are critical.

FAQ

What is the wiper position resolution of the X93155UM8IZT1?

The X93155UM8IZT1 provides 32 discrete wiper positions across its 50 kΩ resistor array, yielding 3.125% resolution per step. This corresponds to a minimum increment (MI) of RTOT/31 ≈ 1.61 kΩ. Absolute linearity error is ±1 MI, and relative linearity error between adjacent taps is ±0.5 MI, ensuring predictable stepwise resistance changes during digital adjustment.

How does the X93155UM8IZT1 retain its wiper setting after power loss?

The X93155UM8IZT1 stores the current wiper position in on-chip nonvolatile EEPROM memory when CS transitions HIGH while INC is held HIGH. Upon subsequent power-up, if CS is held HIGH during VCC ramp-up, the stored value is automatically recalled and applied to the wiper. This ensures the X93155UM8IZT1 resumes operation at the last calibrated setting without MCU intervention.

Can the X93155UM8IZT1 operate from a 3.3 V supply?

No, the X93155UM8IZT1 is specified only for VCC = 5 V ±10% (4.5 V to 5.5 V). Its input thresholds (VIH = 0.7×VCC, VIL = 0.1×VCC), internal logic, and resistor array design are optimized for 5 V operation. Using 3.3 V violates recommended operating conditions and may result in unreliable wiper movement, failed EEPROM writes, or undefined behavior in the X93155UM8IZT1.

What is the maximum allowable voltage across RH and RL terminals of the X93155UM8IZT1?

The X93155UM8IZT1 permits terminal voltages from VSS to VCC only-i.e., 0 V to 5.5 V-on both RH and RL pins. Applying voltage outside this range violates absolute maximum ratings and risks latch-up or permanent damage. Additionally, maximum resistor current is limited to 2 mA, corresponding to ≤110 Ω minimum load impedance at 5.5 V across the X93155UM8IZT1 terminals.

Is the X93155UM8IZT1 pin-compatible with other members of the X9315x family?

Yes, the X93155UM8IZT1 shares identical pinout, package (MSOP-8), and 3-wire interface with other X9315x variants such as X93145 and X93135. Differences lie in RTOTAL values (e.g., 10 kΩ, 100 kΩ) and temperature ranges, but the X93155UM8IZT1's pin functions, timing, and control protocol remain consistent across the family-enabling drop-in substitution where resistance value and grade match system requirements.