Renesas X9315USIZ

Overview

X9315USIZ from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 31-element resistor array with 32 wiper tap positions, nonvolatile wiper position storage, and 3-wire serial interface (CS/U/D/INC). It operates at 5V ±10%, delivers ±3.75mA max wiper current, and features 10kΩ end-to-end resistance with ±20% tolerance - used for precision analog trimming in industrial sensor signal conditioning circuits.

For engineers reviewing the X9315USIZ datasheet, X9315USIZ pinout, X9315USIZ application, or X9315USIZ equivalent, key selection considerations include its -40°C to +85°C industrial temperature range, Pb-free SOIC-8 package (M8.15), 5µA standby current, and nonvolatile recall on power-up - critical for calibration-critical embedded systems requiring repeatable analog settings across power cycles.

Technical Context

The X9315USIZ integrates a 5-bit up/down counter, decoder, nonvolatile memory, and resistor array 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 EEPROM store when raised high with INC high.

It functions as either a three-terminal voltage divider or two-terminal variable resistor. Wiper resistance is 200Ω (typ.) at VCC = 5V, and total resistance exhibits ±300 ppm/°C temperature coefficient - enabling stable gain/offset adjustment in temperature-varying environments without recalibration.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (Pb-free), JEDEC MS-012-AA compliant, 1.27 mm pitch, body size 4.90 × 3.90 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRZ10 and MCP41010-I/P, the X9315USIZ uniquely combines single-channel simplicity, true nonvolatile wiper storage, and industrial temperature rating - eliminating dependency on host firmware for calibration retention in standalone or safety-critical subsystems.

Availability

X9315USIZ is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifier trim, and power supply feedback divider applications requiring stable component supply, long-term calibration integrity, and RoHS-compliant packaging.

Supply support for X9315USIZ 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 X9315USIZ belongs to the XDCP™ family of digitally controlled potentiometers engineered for replacing mechanical trimmers in industrial, medical, and test equipment where reliability, repeatability, and nonvolatile setting retention are essential.

FAQ

What is the maximum wiper current rating for the X9315USIZ?

The X9315USIZ has a maximum wiper current rating of ±3.75 mA under recommended operating conditions. This limit ensures safe operation without exceeding the 10 mW maximum power rating or causing excessive wiper resistance drift. Exceeding this current may degrade long-term reliability or introduce nonlinearities in the resistor array. The X9315USIZ wiper resistance is specified at 200 Ω (typ.) when VCC = 5 V, directly supporting this current limit in typical voltage-divider configurations.

Does the X9315USIZ require an external clock or microcontroller to operate?

No, the X9315USIZ operates autonomously using only three digital control lines: CS, U/D, and INC. It contains an integrated 5-bit up/down counter and decoder, requiring no external clock source or microcontroller firmware to move the wiper. A simple GPIO-driven toggle on INC (with U/D set for direction and CS low) suffices for position adjustment. The X9315USIZ stores wiper position in nonvolatile memory when CS rises high while INC is high - all logic is self-contained within the IC.

Can the X9315USIZ be used with a 3.3V supply?

No, the X9315USIZ is rated for 5 V ±10% (4.5 V to 5.5 V) only. It is not specified or guaranteed for 3.3 V operation. The datasheet explicitly lists "X9315" variants (not "X9315-2.7") for 5 V use, and the X9315USIZ marking corresponds to the 5 V version with industrial temperature range and SOIC packaging. For 3.3 V systems, consider the X9315USIZ-2.7 variant, which supports 2.7 V to 5.5 V - but that is a distinct part number, not the X9315USIZ.

How does the X9315USIZ handle power-up sequencing?

The X9315USIZ has no strict power-up sequencing requirements. As long as VCC is ≥ VH, VL, and VW at all times, arbitrary voltage ramp rates and pin voltage application order are permitted. Upon power-up, the device automatically recalls the last stored wiper position from nonvolatile memory within 5 µs, ensuring immediate analog functionality without host initialization. The X9315USIZ remains in standby until CS is asserted low, minimizing current draw during inactive periods.

Is the X9315USIZ pin-compatible with other members of the X9315 family?

Yes, all X9315 variants - including X9315USIZ, X9315WSIZ, and X9315UMIZ - share identical 8-pin SOIC, MSOP, and PDIP pinouts and electrical interfaces. The differences lie solely in end-to-end resistance value (10kΩ, 50kΩ, 100kΩ), temperature grade (-40°C to +85°C vs. 0°C to +70°C), supply voltage range (5V vs. 2.7–5.5V), and packaging (Pb-free marking). The X9315USIZ uses the same pin configuration and control protocol as the entire family, enabling drop-in substitution where resistance and voltage specs align.