Renesas X9317TS8

Overview

X9317TS8 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with 100 wiper tap positions, nonvolatile wiper position storage, and 3-wire up/down serial interface. It operates as a three-terminal voltage divider or two-terminal variable resistor for precision analog trimming in DC bias, gain/offset, and laser diode control circuits.

For engineers reviewing the X9317TS8 datasheet, X9317TS8 pinout, X9317TS8 application, or X9317TS8 equivalent, key selection criteria include its ±20% end-to-end resistance tolerance, 200 Ω typical wiper resistance at 5 V, -40°C to +85°C industrial temperature range, and compatibility with 2.7–5.5 V supply rails.

Technical Context

The X9317TS8 integrates a 7-bit up/down counter, decoder, and nonvolatile memory to control wiper position across 100 discrete taps. Its "make-before-break" switching ensures continuity during wiper transitions, while ratiometric temperature coefficient of ±20 ppm/°C maintains voltage-divider accuracy under thermal drift.

Control logic responds to negative-edge-triggered INC input with U/D direction select and CS chip enable; nonvolatile store occurs on CS↑ with INC high. The device retains wiper position for 100 years and supports 100,000 data changes per bit.

Key Specifications

Pinout & Package

Package: 8-lead TSSOP (RoHS-compliant, JEDEC MO-153 AC, 4.4 mm × 3.0 mm body, 0.65 mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5171BRMZ10 and MCP41HV51-103, the X9317TS8 uniquely combines 100-tap resolution, guaranteed nonvolatile retention, and minimal 3-wire GPIO interface-making it optimal for space-constrained, self-initializing analog calibration without bus overhead or external memory.

Availability

X9317TS8 is available at Aetrix Electronics and suitable for LCD bias control, laser diode biasing, voltage regulator feedback, and precision DC offset trimming requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9317TS8 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and enterprise applications.

The X9317 series belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, engineered specifically for replacing mechanical trimmers in high-reliability analog signal conditioning and power management circuits.

FAQ

What is the operating temperature range for the X9317TS8?

The X9317TS8 is rated for industrial operation from -40°C to +85°C. This range is validated across all electrical specifications including end-to-end resistance tolerance, wiper resistance, and timing parameters. The device uses temperature-compensated resistor elements and maintains ±20 ppm/°C ratiometric temperature coefficient to ensure stable voltage division performance across this full span. No derating or external compensation is required for X9317TS8 operation within these limits.

Does the X9317TS8 require an external clock or microcontroller to retain its wiper position?

No, the X9317TS8 does not require external support to retain its wiper position. It contains integrated nonvolatile memory that automatically stores the current wiper setting upon receipt of a valid store command (CS rising edge with INC high). That stored value persists for 100 years and is recalled on every power-up, enabling fully autonomous operation. The X9317TS8 functions as a self-contained digital potentiometer without dependency on host firmware or backup power sources.

Can the X9317TS8 be used in a two-terminal variable resistor configuration?

Yes, the X9317TS8 supports two-terminal variable resistor operation by connecting either RH or RL to RW and using the remaining fixed terminal with RW as the adjustable resistance element. In this mode, the device delivers a 0–10 kΩ range (±20%) with 100 discrete steps. Wiper resistance (200 Ω typ.) and temperature coefficient remain applicable, and nonvolatile storage preserves the selected resistance value across power cycles-making it suitable for current-setting applications like laser diode bias or LED drive control.

What is the maximum allowable voltage across RH and RL terminals of the X9317TS8?

The absolute maximum voltage across RH and RL terminals of the X9317TS8 is +6 V, as specified in the Absolute Maximum Ratings table. However, for reliable operation within datasheet limits, the voltage applied across RH–RL must remain within the supply rails: VSS ≤ VRH, VRL ≤ VCC. With VCC = 5.5 V and VSS = 0 V, the practical maximum RH–RL differential is 5.5 V. Exceeding this risks exceeding power rating (10 mW) or violating linearity specs, especially near end terminals.

How does the X9317TS8 handle wiper movement during rapid successive INC pulses?

The X9317TS8 processes each negative edge on the INC pin as a discrete step command, moving the wiper one tap per pulse in the direction set by U/D. Its "make-before-break" switching ensures no open-circuit condition occurs-even during multi-step sequences. However, if multiple taps are traversed rapidly, the effective RTOTAL may temporarily decrease due to parallel conduction paths; full settling to final resistance value requires up to 5 µs (tPU spec). For stable analog output, allow ≥1 µs between INC edges or verify settling in target circuit with oscilloscope.