Renesas X9313UST2

Overview

X9313UST2 from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 32-tap linear resistor array with nonvolatile wiper position storage, 3-wire serial interface (CS/U/D/INC), ±V_CC terminal voltage tolerance, and 10 kΩ end-to-end resistance - used for precision analog trimming in voltage reference and op-amp feedback networks.

For engineers reviewing the X9313UST2 datasheet, X9313UST2 pinout, X9313UST2 application, or X9313UST2 equivalent, key selection criteria include wiper endurance (100,000 cycles), power-up recall behavior, ±4.4 mA max wiper current, and compatibility with 3–5.5 V supply rails in industrial temperature range (−40°C to +85°C).

Technical Context

The X9313UST2 integrates a 31-element resistor ladder, 5-bit up/down counter, make-before-break wiper switching, and EEPROM-based nonvolatile memory for wiper position retention. Its control logic responds to edge-triggered INC input synchronized with U/D direction and CS enable, enabling deterministic tap stepping without microcontroller polling.

Operation supports both three-terminal potentiometer (VH–VW–VL) and two-terminal variable resistor configurations. Wiper resistance is 40 Ω typical at V_CC = 5 V, and terminal voltage range spans −V_CC to +V_CC, allowing bipolar signal conditioning in op-amp circuits.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free, RoHS compliant), 3.9 mm × 4.9 mm body, 1.27 mm pitch - surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5243BRMZ10 and MCP41010-I/P, the X9313UST2 uniquely delivers autonomous power-up recall, 3-wire minimal GPIO footprint, and bipolar terminal voltage support - making it optimal for industrial systems where reliability, simplicity, and analog signal integrity are prioritized over communication protocol flexibility.

Availability

X9313UST2 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supplies, and analog front-end trimming requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.

Supply support for X9313UST2 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 is a precision analog and power management semiconductor provider, now part of Renesas Electronics, with deep expertise in high-reliability industrial and infrastructure solutions.

The X9313 product line was designed specifically for solid-state replacement of mechanical potentiometers in analog signal conditioning, offering nonvolatile storage, temperature-stable resistance ratios, and robust ESD performance for harsh operating environments.

FAQ

What is the maximum allowable voltage difference between VH and VL terminals for the X9313UST2?

The X9313UST2 specifies ΔV = |VH − VL| ≤ 10 V for the X9313W/X9313U family variants. Since X9313UST2 is an X9313U variant (per ordering table: "X9313USZ" and "X9313USIZ" denote U-series, 10 kΩ, industrial temp), its absolute maximum terminal differential is 10 V. Exceeding this risks irreversible damage to the internal resistor array or switching transistors.

Does the X9313UST2 require an external pull-up resistor on the INC pin?

No, the X9313UST2 does not require an external pull-up on the INC pin. Its INC input has CMOS-compatible thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2 V) and leakage current ≤ ±10 µA, allowing direct connection to microcontroller GPIOs configured as push-pull outputs. Internal pull-ups are not provided, but external ones are unnecessary unless open-drain driving is used.

How is the wiper position stored in nonvolatile memory on the X9313UST2?

The X9313UST2 stores the current wiper position when CS transitions HIGH while INC is held HIGH. This store operation takes 10 ms (t_WR). During that time, the device enters standby mode and ignores further INC pulses. Once complete, the value persists for 100 years and is automatically loaded into the wiper counter on next power-up, independent of external control.

Can the X9313UST2 be used in a bipolar signal path where VH is at −2.5 V and VL is at +2.5 V?

Yes - the X9313UST2 supports terminal voltages from −V_CC to +V_CC. With V_CC = 5 V, VH and VL may each range from −5 V to +5 V, so −2.5 V and +2.5 V are fully within specification. The wiper (VW) will track proportionally between them, and the 10 kΩ R_TOTAL remains valid across this range, enabling true bipolar AC signal attenuation.

What is the typical wiper resistance of the X9313UST2 and how does it affect circuit performance?

The X9313UST2 has a typical wiper resistance (R_W) of 40 Ω at V_CC = 5 V, with a maximum of 100 Ω. In high-gain op-amp feedback networks or low-impedance divider applications, this series resistance introduces gain error and temperature-dependent offset. For example, in a 10 kΩ total pot, 40 Ω adds ~0.4% error - acceptable for most trimming tasks but must be modeled in precision references.