Renesas X9313UST1

Overview

X9313UST1 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), ±VCC terminal voltage capability, and 10 kΩ end-to-end resistance - used for precision analog trimming in voltage divider and variable resistor configurations.

For engineers reviewing the X9313UST1 datasheet, X9313UST1 pinout, X9313UST1 application, or X9313UST1 equivalent, key selection criteria include its 3-wire interface timing (tIW = 5 µs, tCYC = 2 µs), ±4.4 mA wiper current rating, 100-year data retention, 100,000-cycle endurance, and compatibility with 3V–5.5V supply operation in industrial temperature range (−40°C to +85°C).

Technical Context

The X9313UST1 integrates a 31-element resistor ladder, 5-bit up/down counter, nonvolatile memory store/recall circuitry, and 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 when high with INC high.

Operation supports both three-terminal potentiometer (RH/VH–RW/VW–RL/VL) and two-terminal variable resistor modes. Wiper resistance is 40 Ω typical at VCC = 5 V, and terminal voltage range extends from −VCC to +VCC, enabling bipolar signal conditioning without external level-shifting.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free, RoHS compliant), 3.9 mm × 4.9 mm body, 1.27 mm lead pitch, M8.15 outline.

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 X9313UST1 offers unique 3-wire simplicity and guaranteed ±VCC terminal operation - making it optimal for cost-sensitive, bipolar-signal industrial trimming where minimal GPIO usage and robust power-cycle retention are required.

Availability

X9313UST1 is available at Aetrix Electronics and suitable for audio signal conditioning, voltage reference calibration, comparator hysteresis setting, and op-amp offset adjustment requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9313UST1 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 series was designed specifically for solid-state replacement of mechanical potentiometers in analog trimming applications demanding nonvolatile storage, bipolar signal handling, and low-pin-count digital control.

FAQ

What is the operating voltage range for the X9313UST1?

The X9313UST1 operates from 3 V to 5.5 V on VCC. Its RH/VH and RL/VL terminals support voltages from −VCC to +VCC, enabling direct use with bipolar analog signals up to ±5.5 V. This allows integration into split-supply op-amp circuits without external level-shifting components. The X9313UST1's specified active current is 3 mA max at VCC = 5 V, and standby current is 500 µA max.

Does the X9313UST1 retain its wiper position after power loss?

Yes, the X9313UST1 stores the wiper position in nonvolatile memory and automatically recalls it on power-up. This feature requires a store command - executed by raising CS high while INC is held high - which writes the current counter value to memory. Once stored, the setting persists for 100 years with 100,000 guaranteed write cycles. The X9313UST1 thus eliminates startup recalibration in embedded systems.

How does the 3-wire interface of the X9313UST1 work?

The X9313UST1 uses CS (chip select), U/D (up/down), and INC (increment) signals. CS enables the device when low; each negative edge on INC moves the wiper one tap in the direction set by U/D. A store operation occurs when CS rises while INC is high. Unlike I²C or SPI, this interface requires no clock or data lines beyond these three, reducing MCU pin count and firmware complexity. The X9313UST1's tCYC = 2 µs minimum cycle time supports rapid trimming updates.

Can the X9313UST1 be used as a two-terminal variable resistor?

Yes, the X9313UST1 supports both three-terminal potentiometer and two-terminal variable resistor configurations. In two-terminal mode, either RH/VH or RL/VL is tied to RW/VW, leaving one fixed terminal and the wiper as the two accessible nodes. The device maintains its ±4.4 mA wiper current rating and 40 Ω typical wiper resistance in this mode. This flexibility makes the X9313UST1 suitable for current-setting, gain control, and bias adjustment applications.

What package type is used for the X9313UST1?

The X9313UST1 is supplied in an 8-lead SOIC package (Pb-free, RoHS compliant), per JEDEC MS-012-AA outline M8.15. It measures 3.9 mm × 4.9 mm with 1.27 mm lead pitch and is compatible with standard surface-mount reflow processes. The "T1" suffix denotes tape-and-reel packaging per TB347 specifications. This package provides robust thermal performance and board-level reliability for industrial environments where the X9313UST1 is commonly deployed.