Renesas X9315UMZ

Overview

X9315UMZ from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 31-element resistor array with 32 wiper tap points, nonvolatile wiper position storage, and 3-wire serial interface (CS/U/D/INC). It functions as a three-terminal potentiometer or two-terminal variable resistor in analog signal conditioning circuits operating at 5V ±10% supply, with 50kΩ end-to-end resistance and 0°C to +70°C commercial temperature range.

For engineers reviewing the X9315UMZ datasheet, X9315UMZ pinout, X9315UMZ application, or X9315UMZ equivalent, key selection criteria include its 50kΩ RTOTAL tolerance (±20%), wiper resistance (200–400Ω at VCC = 5V), low standby current (5µA max), nonvolatile memory endurance (100,000 cycles), and MSOP-8 Pb-free RoHS-compliant packaging.

Technical Context

The X9315UMZ integrates a 5-bit up/down counter, 5-bit nonvolatile memory for wiper position retention, and a 31-resistor ladder with make-before-break wiper switching. Its control logic responds to negative-edge-triggered INC pulses while U/D sets direction, and CS enables selection or initiates nonvolatile store on rising edge with INC high.

It operates exclusively as a solid-state potentiometer-no DAC, ADC, or voltage reference functionality-and supports only discrete wiper positioning (not continuous analog output). Terminal voltages are constrained to 0–VCC, and absolute linearity error is ±1 MI (minimum increment = RTOTAL/31).

Key Specifications

Pinout & Package

Package: 8-lead MSOP (Pb-free, RoHS compliant), JEDEC MO-187AA / Intersil M8.118, dimensions 3.0mm × 3.0mm × 0.85mm.

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 X9315UMZ offers simpler 3-wire control, guaranteed nonvolatile retention without host intervention, and lower standby current (5µA vs. ~1µA–10µA), making it optimal for cost-sensitive, single-channel, set-and-forget analog trimming.

Availability

X9315UMZ is available at Aetrix Electronics and suitable for audio equipment, laser diode drivers, programmable power supplies, and sensor signal conditioning circuits requiring stable component supply and long-term calibration retention.

Supply support for X9315UMZ 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 X9315UMZ belongs to the XDCP™ family of digitally controlled potentiometers engineered for replacing mechanical trimmers in analog signal path calibration, offering solid-state reliability and nonvolatile memory for factory-set or field-adjustable configurations.

FAQ

What is the maximum wiper current rating for the X9315UMZ?

The X9315UMZ has a maximum wiper current rating of ±3.75mA under recommended operating conditions. This limit ensures safe operation within the 10mW maximum power rating and prevents degradation of the 31-resistor array or wiper switches. Exceeding this current may cause irreversible resistance drift or open-circuit failure. The X9315UMZ must be used in configurations where the voltage across RH–RL does not drive IW beyond this threshold.

Does the X9315UMZ require an external pull-up or pull-down resistor on any control pin?

No, the X9315UMZ does not require external pull-up or pull-down resistors on CS, U/D, or INC pins. Its input leakage current is specified at ±10µA, and VIH/VIL thresholds are defined relative to VCC (VIH ≥ 0.7×VCC, VIL ≤ 0.1×VCC), allowing direct connection to CMOS logic outputs. Internal design ensures stable logic states without external biasing, simplifying PCB layout and reducing BOM count for the X9315UMZ.

How long does the X9315UMZ retain wiper position after power removal?

The X9315UMZ retains wiper position for 100 years in nonvolatile memory after power removal, as specified in the FN8179 datasheet. This retention is guaranteed under normal storage conditions (–65°C to +150°C) and does not depend on battery backup or external circuitry. Upon power-up, the X9315UMZ automatically recalls the last stored value and configures the wiper accordingly, enabling true "set-and-forget" operation.

Can the X9315UMZ operate with a 3.3V supply?

No, the X9315UMZ is rated for 4.5V to 5.5V supply (5V ±10%) and is not specified for 3.3V operation. Attempting to power the X9315UMZ at 3.3V may result in undefined logic behavior, incomplete wiper movement, or failure to store positions in nonvolatile memory. For 3.3V systems, consider the X9315UMZ-2.7 variant, which supports 2.7V to 5.5V and is explicitly characterized down to 2.7V.

What is the typical wiper resistance of the X9315UMZ at 5V supply?

The typical wiper resistance of the X9315UMZ at VCC = 5V is 200Ω, with a maximum of 400Ω across temperature and process variation. This value represents the series resistance between the RW/VW terminal and the selected resistor tap point, directly impacting loading error in high-impedance circuits. At 2.7V supply, wiper resistance increases to 400–1000Ω, confirming that the X9315UMZ's 5V-optimized design delivers lowest on-resistance in its intended operating range.