Renesas X9315WS-2.7T1

Overview

X9315WS-2.7T1 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 operates from 2.7V to 5.5V, offers 10kΩ end-to-end resistance, ±20% tolerance, and is rated for 0°C to +70°C commercial temperature range in an 8-lead SOIC package. It serves as a solid-state replacement for mechanical potentiometers in precision analog trimming applications.

For engineers reviewing the X9315WS-2.7T1 datasheet, X9315WS-2.7T1 pinout, X9315WS-2.7T1 application, or X9315WS-2.7T1 equivalent, this device delivers low-power operation (80µA active, 5µA standby), temperature-compensated linearity (±1 MI absolute, ±0.2 MI relative), and EEPROM-based power-up recall - critical for stable biasing, gain control, and calibration-critical embedded systems.

Technical Context

The X9315WS-2.7T1 uses a 5-bit up/down counter driving a decoder that selects one of 32 wiper positions across a monolithic 31-resistor ladder. Its "make-before-break" switching ensures continuity during wiper transitions, while nonvolatile memory stores the last valid wiper setting for automatic restoration at power-up.

Control logic responds to negative-edge-triggered INC pulses synchronized with U/D direction and CS enable; wiper position is latched into EEPROM only when CS rises while INC is HIGH. The device supports ratiometric operation with terminal voltages spanning 0V to VCC and exhibits ±300 ppm/°C total resistance drift and -120 dBV noise at 1 kHz.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (M8.15E), RoHS-compliant, Pb-free, 3.90 mm × 4.90 mm footprint.

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 X9315WS-2.7T1 uniquely combines 3-wire simplicity, guaranteed power-up recall, and commercial-grade temperature stability - making it optimal for cost-sensitive, single-channel analog trimming where deterministic startup behavior is mandatory.

Availability

X9315WS-2.7T1 is available at Aetrix Electronics and suitable for audio volume control, laser diode bias adjustment, and power supply output trim requiring stable component supply, long-term calibration retention, and RoHS-compliant packaging.

Supply support for X9315WS-2.7T1 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 X9315WS-2.7T1 belongs to Intersil's XDCP™ (Digitally Controlled Potentiometer) family, engineered specifically for replacing mechanical trimpots in calibration-critical analog circuits where reliability, repeatability, and nonvolatile setting retention are essential.

FAQ

What is the maximum wiper current rating for the X9315WS-2.7T1?

The X9315WS-2.7T1 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 inducing excessive self-heating in the resistor array. Exceeding this current may degrade linearity or accelerate wear in the wiper switching network. Always verify current paths in your circuit using the actual voltage differential across RH and RL.

Does the X9315WS-2.7T1 require external pull-up resistors on its control pins?

No, the X9315WS-2.7T1 does not require external pull-up resistors on CS, U/D, or INC. Its digital inputs have CMOS-compatible thresholds (VIH = 0.7×VCC, VIL = 0.1×VCC) and exhibit ±10 µA leakage current, allowing direct connection to microcontroller GPIOs. Internal weak pull-downs are not present, so host firmware must drive all control lines definitively to avoid undefined states during initialization or sleep modes.

Can the X9315WS-2.7T1 be used in a two-terminal variable resistor configuration?

Yes, the X9315WS-2.7T1 can be used as a two-terminal variable resistor by connecting either RH/VH or RL/VL to RW/VW and leaving the unused fixed terminal unconnected or tied to a defined potential. In this mode, resistance varies from near-zero (wiper at shorted terminal) to RTOTAL (wiper at opposite terminal). Ensure wiper current remains within ±3.75 mA and voltage across the element stays within 0–VCC to avoid violating absolute maximum ratings.

How long does it take for the X9315WS-2.7T1 to stabilize after power-up?

The X9315WS-2.7T1 achieves stable wiper output within 5 µs after VCC reaches its final value, as specified by tPU (power-up to wiper stable). This fast settling enables immediate analog functionality post-boot without software intervention. The wiper position recalled from nonvolatile memory is active at the conclusion of this interval, provided VCC ramp rate remains within 0.2–50 V/ms per datasheet requirements.

Is the X9315WS-2.7T1 pin-compatible with other members of the X9315 family?

Yes, the X9315WS-2.7T1 shares identical 8-lead SOIC pinout and electrical interface with all X9315 variants, including X9315WSZ-2.7T1 (Pb-free), X9315WSI-2.7T1 (industrial temp), and X9315WMZ-2.7T1 (MSOP). Differences are limited to package type, RoHS status, temperature grade, and marking - enabling drop-in substitution where thermal and compliance requirements align.