Renesas X9313ZST2

Overview

X9313ZST2 from Intersil is a digitally controlled potentiometer (XDCP™) with 32 linear tap positions, 3-wire serial interface (CS/U/D/INC), nonvolatile wiper position storage, and 1kΩ end-to-end resistance. It operates from 3V to 5.5V, supports terminal voltages from –VCC to +VCC, and functions as a three-terminal voltage divider or two-terminal variable resistor in precision analog trimming applications.

For engineers reviewing the X9313ZST2 datasheet, X9313ZST2 pinout, X9313ZST2 application, or X9313ZST2 equivalent, key selection criteria include its ±20% RTOTAL tolerance, 40Ω typical wiper resistance at 5V, 100,000-cycle endurance, 100-year data retention, and compatibility with industrial temperature range (–40°C to +85°C) in 8-lead SOIC packaging.

Technical Context

The X9313ZST2 implements a 31-element resistor array with make-before-break wiper switching, enabling glitch-free tap transitions. Its 5-bit up/down counter decodes to select one of 32 wiper positions, with direction controlled by U/D and step triggered by negative-edge INC while CS is low.

Wiper position is stored in nonvolatile memory when CS rises high with INC held high, then automatically recalled at power-up. The device supports ratiometric operation with ±20 ppm/°C ratiometric temperature coefficient and ±300 ppm/°C end-to-end resistance TC, ensuring stable voltage division under thermal variation.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free, RoHS compliant), 3.9mm × 4.9mm body, 1.27mm lead pitch (JEDEC MS-012-AA).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP41HV51-103, the X9313ZST2 uniquely combines 1kΩ low-RTOTAL, bipolar terminal voltage capability, and autonomous nonvolatile recall-making it optimal for compact, self-contained analog trimming where minimal external support circuitry is required.

Availability

X9313ZST2 is available at Aetrix Electronics and suitable for laser diode bias control, programmable voltage references, audio channel balance, and power supply trim calibration requiring stable component supply, long-term calibration retention, and industrial temperature operation.

Supply support for X9313ZST2 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 solutions provider, now part of Renesas Electronics, with deep expertise in high-reliability industrial and infrastructure ICs.

The X9313 series was designed for solid-state replacement of mechanical potentiometers in calibration-critical analog signal paths, emphasizing nonvolatile retention, temperature stability, and robust digital control.

FAQ

What is the maximum allowable voltage across RH/VH and RL/VL terminals for X9313ZST2?

The absolute maximum voltage difference |VH – VL| for X9313ZST2 is 4V, as specified in the Absolute Maximum Ratings table. This limit applies regardless of VCC level and ensures safe operation of the internal resistor array and switching elements. Exceeding 4V risks irreversible damage to the wiper switches and may degrade long-term endurance performance of the X9313ZST2.

Does X9313ZST2 support true bipolar operation with negative supply rails?

No, X9313ZST2 does not require or support a negative supply rail. Its "–VCC to +VCC" terminal voltage specification means that VH and VL may each swing from –VCC to +VCC relative to VSS (ground), enabling bipolar signal handling-for example, VH = +2.5V and VL = –2.5V when VCC = 2.5V. The device itself operates only from a single positive VCC and VSS, making X9313ZST2 compatible with standard 3.3V or 5V PCB power domains.

How is the wiper position stored and recalled in X9313ZST2?

The X9313ZST2 stores the current wiper position in nonvolatile memory when CS transitions from LOW to HIGH while INC is held HIGH. Upon subsequent power-up, the stored value is automatically loaded into the wiper counter, positioning the wiper at the last saved tap. This recall occurs within 10µs after VCC stabilizes, and no external controller action is needed-enabling fully autonomous calibration retention in X9313ZST2-based designs.

Can X9313ZST2 be used in a two-terminal variable resistor configuration?

Yes, X9313ZST2 can be configured as a two-terminal variable resistor by connecting either RH/VH or RL/VL to RW/VW and using the remaining fixed terminal plus the wiper as the two accessible nodes. In this mode, resistance varies from near-zero (wiper at shorted terminal) to RTOTAL (wiper at opposite terminal). The 40Ω typical wiper resistance and make-before-break switching ensure monotonic, glitch-free behavior-critical for current-setting applications using X9313ZST2.

What is the recommended power-up sequence for reliable operation of X9313ZST2?

The recommended power-up sequence for X9313ZST2 is to apply VCC and VSS first, then assert CS and INC only after VCC has stabilized. To prevent unintended wiper movement or spurious store operations, bring CS and INC to known logic levels (e.g., CS = HIGH, INC = LOW) before or concurrently with VCC ramp-up. Full electrical specifications for X9313ZST2 become valid 1ms after VCC reaches its final value, and wiper stability is achieved within 10µs post-power-up.