Renesas X9315UM

Overview

X9315UM from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 31-element resistor array with 32 wiper tap points, nonvolatile memory for power-up recall, and 3-wire serial interface (CS/U/D/INC). It functions as a three-terminal voltage divider or two-terminal variable resistor in precision analog trimming applications requiring stable resistance values across temperature and time, such as sensor calibration and DC bias adjustment.

For engineers reviewing the X9315UM datasheet, X9315UM pinout, X9315UM application, or X9315UM equivalent, this page delivers verified specifications including 50kΩ end-to-end resistance, ±20% tolerance, 0–5V terminal voltage range, 80µA active current at 5V, and MSOP-8 package compatibility - all confirmed from Intersil FN8179 Rev.2.00.

Technical Context

The X9315UM uses a 5-bit up/down counter driving a decoder to select one of 32 wiper positions across a monolithic resistor ladder. Its control logic operates in make-before-break mode during wiper transitions, preventing open-circuit conditions but temporarily reducing effective RTOTAL when stepping multiple taps.

Nonvolatile memory stores wiper position upon CS↑ with INC↑, enabling automatic restoration at power-up. The device supports only 5V ±10% supply operation (not 2.7V variants), and wiper resistance is 200–400Ω at VCC = 5V, with absolute linearity error limited to ±1 MI and ratiometric tempco of ±20 ppm/°C.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (Pb-free, JEDEC MO-187AA, pkg drawing M8.118), 3.0mm × 3.0mm footprint, 0.65mm lead pitch, 0.70mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP41010-I/P, the X9315UM offers guaranteed 50kΩ resistance with tighter ±20% tolerance, built-in nonvolatile recall eliminating firmware overhead, and simpler 3-wire interface - making it optimal for single-channel, calibration-critical, low-pin-count designs.

Availability

X9315UM is available at Aetrix Electronics and suitable for instrumentation calibration, sensor signal conditioning, and DC bias adjustment requiring stable component supply, long-term calibration retention, and RoHS-compliant packaging.

Supply support for X9315UM 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) is a semiconductor manufacturer specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X9315UM belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in applications demanding long-term stability, programmability, and nonvolatile setting retention.

FAQ

What is the supply voltage range supported by the X9315UM?

The X9315UM operates strictly at 5V ±10% (4.5V to 5.5V). It does not support 2.7V operation - that capability is reserved for X9315-x.2.7 variants like X9315UMZ-2.7. Using voltages outside this range risks violating absolute maximum ratings and may cause unreliable wiper positioning or memory corruption in the X9315UM.

Does the X9315UM retain its wiper position after power cycling?

Yes, the X9315UM automatically recalls its last stored wiper position from nonvolatile memory upon power-up. This behavior occurs without host intervention because the device loads the saved 5-bit counter value into the wiper decoder at VCC stabilization. The X9315UM achieves this using EEPROM technology rated for 100,000 write cycles and 100 years of data retention.

What package type is used for the X9315UM?

The X9315UM is supplied exclusively in an 8-lead MSOP package (JEDEC MO-187AA, drawing M8.118), Pb-free and RoHS compliant. Its dimensions are 3.0mm × 3.0mm body size with 0.65mm lead pitch. This compact surface-mount package supports high-density PCB layouts and is compatible with standard reflow profiles for lead-free soldering.

How many wiper positions does the X9315UM provide?

The X9315UM provides exactly 32 discrete wiper positions, corresponding to a 5-bit counter (0–31). These positions are distributed across 31 identical resistive elements in series, yielding a minimum increment (MI) of RTOTAL/31 ≈ 1.61kΩ per step for the 50kΩ version. Resolution is fixed and not software-configurable.

Can the X9315UM be used as a two-terminal variable resistor?

Yes, the X9315UM can operate as a two-terminal variable resistor by connecting either RH/VH or RL/VL to the wiper RW/VW, leaving the unused terminal open or grounded depending on circuit requirements. In this mode, resistance varies from near 0Ω (wiper at shorted terminal) to full RTOTAL (wiper at opposite end), maintaining the same 32-step granularity and nonvolatile storage capability as in three-terminal mode.