Renesas X9317TS8I

Overview

X9317TS8I 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 X9317TS8I datasheet, X9317TS8I pinout, X9317TS8I application, or X9317TS8I equivalent, key selection criteria include end-to-end resistance tolerance (±20%), wiper resistance (200–400 Ω at 5 V), standby current (<5 µA), ratiometric temperature coefficient (±20 ppm/°C), and industrial temperature range (−40°C to +85°C).

Technical Context

The X9317TS8I 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 the resistor array is temperature-compensated to maintain ratiometric stability.

Control logic responds to CS (chip select), U/D (direction), and edge-triggered INC (increment) signals. Wiper position is stored in nonvolatile memory only when CS rises while INC is high-enabling deterministic power-up recall without unintended writes during system initialization.

Key Specifications

Pinout & Package

Package: 8-lead TSSOP (RoHS-compliant, JEDEC MO-153 AC, M8.173 drawing), 4.4 mm × 3.0 mm footprint, 1.2 mm max height, 0.65 mm lead pitch.

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 X9317TS8I provides deterministic power-up behavior via nonvolatile recall, superior ratiometric stability (±20 ppm/°C), and simpler 3-wire control-making it optimal for unattended, temperature-critical analog trimming where reliability and minimal host intervention are essential.

Availability

X9317TS8I is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias adjustment, voltage regulator output tuning, and precision DC offset trimming requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9317TS8I 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 infrastructure markets.

The X9317 series belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical potentiometers in high-reliability analog trimming applications where nonvolatile setting retention and temperature-stable ratiometric performance are mandatory.

FAQ

What is the operating temperature range for the X9317TS8I?

The X9317TS8I is rated for industrial operation from −40°C to +85°C. This range is confirmed in the Ordering Information table (Page 2) for all "I" suffix variants-including X9317TS8I-and applies to all electrical specifications including end-to-end resistance tolerance, wiper resistance, and ratiometric temperature coefficient. The device maintains full functionality and parameter compliance across this span without derating.

Does the X9317TS8I require an external power-on reset circuit to ensure correct wiper initialization?

No, the X9317TS8I does not require an external power-on reset circuit. Upon power-up, it automatically recalls the last stored wiper position from nonvolatile memory within 5 µs (tPU, Page 6). The recommended power-up sequence-applying VCC/VSS before analog voltages-ensures stable operation without unintended tap changes, and the internal logic handles initialization autonomously.

Can the X9317TS8I be used in a two-terminal variable resistor configuration?

Yes, the X9317TS8I supports two-terminal variable resistor operation by connecting either RH or RL to RW and using the remaining terminal plus RW as the adjustable resistance element. This mode is explicitly validated in Figure 4 ("Two Terminal Variable Resistor; Variable Current") and referenced in the Applications section (Page 1) for current control applications-enabling direct substitution for mechanical rheostats in LED bias or sensor excitation circuits.

What is the maximum allowable voltage across RH and RL terminals of the X9317TS8I?

The absolute maximum voltage between RH and RL terminals is +6 V, as specified in the Absolute Maximum Ratings table (Page 4). This limit is independent of VCC and applies regardless of wiper position. Exceeding +6 V risks permanent damage to the internal resistor array or wiper switches, even if VCC remains within its 2.7–5.5 V operating range.

How is nonvolatile storage triggered on the X9317TS8I?

Nonvolatile storage on the X9317TS8I is triggered by a rising edge on the CS pin while the INC pin is held HIGH (Page 8, "Chip Select" description and Mode Selection table). This specific timing condition initiates a 5–10 ms store cycle (tWR, Page 6), after which the device enters standby mode. No other combination of CS, INC, or U/D states performs a nonvolatile write-preventing accidental updates during normal operation.