Renesas X93154UM8IZ-3T1

Overview

X93154UM8IZ-3T1 from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 32-tap, 50kΩ end-to-end resistor array with nonvolatile wiper position storage. It operates as a two-terminal variable resistor using a 3-wire serial interface (CS/U/D/INC), supports 3V ±10% supply, and delivers low-power operation (250µA active, 1µA standby) for precision analog trimming in space-constrained industrial systems.

For engineers reviewing the X93154UM8IZ-3T1 datasheet, X93154UM8IZ-3T1 pinout, X93154UM8IZ-3T1 application, or X93154UM8IZ-3T1 equivalent, key selection criteria include its 50kΩ RTOTAL with ±30% tolerance, 31-resistor-element architecture, -40°C to +85°C operating range, MSOP-8 package, and EEPROM-based power-up recall functionality.

Technical Context

The X93154UM8IZ-3T1 integrates a 5-bit up/down counter, nonvolatile memory, and resistor array decoding logic to select one of 32 wiper positions across 31 resistive elements. Wiper movement is controlled by negative-edge-triggered INC pulses synchronized with U/D direction control and CS enable.

It features temperature-compensated resistance (±35 ppm/°C), supports terminal voltages from VSS to VCC, and guarantees 200,000 data changes per bit with 100-year data retention. The device enters low-power standby when CS is deasserted with INC high after store completion.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (M8.118), Pb-free/RoHS-compliant, 3.0mm × 4.9mm footprint with 0.65mm 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 MCP45HV51-503E/MS, the X93154UM8IZ-3T1 offers simpler 3-wire control, lower active current (250µA vs. >500µA), and guaranteed power-up recall without host intervention-making it optimal for ultra-low-power, self-initializing industrial trim applications.

Availability

X93154UM8IZ-3T1 is available at Aetrix Electronics and suitable for LCD contrast adjustment, instrumentation amplifier bias trimming, and microcontroller-based gain control requiring stable component supply, long-term calibration retention, and industrial temperature operation.

Supply support for X93154UM8IZ-3T1 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 X93154UM8IZ-3T1 belongs to Intersil's XDCP™ (eXternally Digitally Controlled Potentiometer) family, engineered for replacing mechanical potentiometers in precision analog trimming applications where reliability, nonvolatility, and low power are critical.

FAQ

What is the maximum terminal voltage allowed on RH and RL pins of the X93154UM8IZ-3T1?

The RH and RL pins of the X93154UM8IZ-3T1 accept voltages from VSS (ground) to VCC only-i.e., 0V to 3.3V under nominal 3V ±10% supply. Exceeding VCC risks damage, as absolute maximum rating is +6.5V relative to VSS, but operation outside 0–VCC violates recommended conditions and may impair linearity or cause latch-up.

Does the X93154UM8IZ-3T1 require an external power-on reset circuit to ensure correct wiper initialization?

No. The X93154UM8IZ-3T1 automatically recalls the last stored wiper position from nonvolatile memory upon power-up, provided CS is held HIGH during VCC ramp. No external reset or host MCU initialization is needed-this behavior is intrinsic to the device's EEPROM architecture and power sequencing design.

Can the X93154UM8IZ-3T1 be used in a three-terminal potentiometer configuration?

No. The X93154UM8IZ-3T1 is internally configured as a two-terminal variable resistor only. RH and RL serve as fixed endpoints; the wiper is not exposed as a separate pin. Its block diagram and pinout confirm no dedicated wiper output terminal-unlike some digital pots, it cannot function as a traditional 3-terminal voltage divider.

What is the minimum INC pulse width required for reliable wiper stepping in the X93154UM8IZ-3T1?

The X93154UM8IZ-3T1 requires a minimum INC HIGH period (tIH) of 1µs and a minimum INC LOW period (tIL) of 1µs, per AC Electrical Specifications. Combined with tCYC ≥2µs, this defines a practical minimum toggle rate of 500 kHz-ensuring robust counter advancement without missing steps or metastability.

How does the X93154UM8IZ-3T1 handle multiple consecutive wiper movements?

When the X93154UM8IZ-3T1 wiper moves several positions rapidly, transient resistance deviations occur due to switch timing skew across the 31-element array. The datasheet notes that 2-terminal resistance may "temporarily change by a significant amount" during multi-step transitions-designers should allow settling time or avoid burst stepping in precision-critical paths.