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Renesas X9318WS8IT1
- Part No.:
- X9318WS8IT1
- Manufacturer:
- Renesas
- Category:
- Digital Potentiometers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
X9318WS8IT1.pdf
- Description:
- IC DGTL POT 10KOHM 100TAP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,016
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Product details
Overview
X9318WS8IT1 from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 10 kΩ end-to-end resistance with 100 wiper tap points, nonvolatile wiper position storage, and 3-wire serial interface (CS/U/D/INC). It operates from 4.5–5.5 V, supports 0–8 V terminal voltage, and delivers ±1% absolute linearity for precision analog trimming in DC bias, gain/offset, and voltage regulator control circuits.
For engineers reviewing the X9318WS8IT1 datasheet, X9318WS8IT1 pinout, X9318WS8IT1 application, or X9318WS8IT1 equivalent, this device serves as a solid-state replacement for mechanical potentiometers where programmable, repeatable, and temperature-stable resistance adjustment is required-especially in LCD bias, laser diode control, and embedded power management systems.
Technical Context
The X9318WS8IT1 integrates a 99-element resistor array with "make-before-break" electronic wiper switching, a 7-bit up/down counter, and nonvolatile memory for wiper position retention across power cycles. Its control logic responds to CS-select, edge-triggered INC, and level-sensitive U/D inputs to move the wiper in discrete steps without wraparound.
It features temperature-compensated resistive elements (±300 ppm/°C RTOTAL TC), ratiometric tracking (±20 ppm/°C), and low-power CMOS operation: 3 mA max active current and 1 mA max standby current at VCC = 5 V. Wiper resistance is specified at 40–200 Ω, and terminal voltage tolerance is 0–8 V relative to VSS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RTOTAL | 10 kΩ ±20% - defines full-scale resistance range for voltage divider or variable resistor use |
| Wiper resolution | 100 tap points (0–99) - enables 1% step resolution for fine analog adjustment |
| Linearity | ±1% absolute, ±0.2% relative - ensures predictable voltage division across full travel |
| VCC range | 4.5–5.5 V - compatible with standard 5 V digital logic supply rails |
| Terminal voltage | 0 to +8 V (RH/RL/RW to VSS) - supports biasing beyond supply rail in open-loop configurations |
| Endurance | 100,000 data changes per bit - guarantees long-term field reliability under repeated reconfiguration |
| Data retention | 100 years - preserves factory- or system-set trim values across decades of shelf life and operation |
Pinout & Package
Package: 8-lead SOIC (150 mil), RoHS-compliant Pb-free plus anneal finish, JEDEC MS-012AC variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: INC | Increment clock input | Negative-edge triggered; toggles wiper position when CS is low |
| 2: U/D | Direction control input | High = wiper moves toward RH; Low = wiper moves toward RL |
| 3: RH | High fixed terminal | Analog reference point for top of resistor array; not necessarily highest voltage |
| 4: VSS | Ground reference | Logic and analog ground return; must be connected before VCC during power-up |
| 5: RW | Wiper output terminal | Movable contact point; series resistance 40–200 Ω affects signal path loading |
| 6: RL | Low fixed terminal | Analog reference point for bottom of resistor array; not necessarily lowest voltage |
| 7: CS | Chip select | Active-low enable; HIGH with INC HIGH stores wiper position to NV memory |
| 8: VCC | Supply voltage | 4.5–5.5 V CMOS supply; ramp rate limited to 0.2–50 V/ms to prevent spurious writes |
Key Features
| Feature | Design Value |
|---|---|
| Nonvolatile wiper storage | Wiper position retained for 100 years without backup power-enables true "power-on preset" behavior |
| Temperature-compensated array | ±300 ppm/°C RTOTAL drift and ±20 ppm/°C ratiometric tracking ensure stable divider ratio over -40°C to +85°C |
| Make-before-break wiper switching | Prevents open-circuit transients during tap transitions-critical for bias continuity in sensitive analog loops |
| Low-power CMOS interface | 3 mA active / 1 mA standby current enables integration into battery-backed or energy-constrained systems |
| Three-terminal potentiometer mode | Supports classic voltage divider configuration (RH–RW–RL) or two-terminal variable resistor (RH–RW or RW–RL) |
Applications
| LCD Bias Control | Laser Diode Bias Control |
|---|---|
|
Use Scenario: Adjusting contrast and gamma voltage on monochrome or segment LCD panels in industrial HMIs and instrumentation displays. IC Role / Device Role / Timing Role: Three-terminal potentiometer setting DC bias voltage between VDD and ground via RH–RW–RL terminals. Use Value: Eliminates manual calibration; enables firmware-controlled contrast tuning and automatic temperature compensation using stored presets. |
Use Scenario: Setting precise forward current for edge-emitting laser diodes in optical transceivers and fiber sensor modules. IC Role / Device Role / Timing Role: Two-terminal variable resistor (RW–RL) in series with laser anode to regulate bias current independently of supply variation. Use Value: Maintains consistent optical output power across thermal drift and aging-no recalibration needed over product lifetime. |
| Voltage Regulator Output Trim | DC Offset/Gain Adjustment |
|
Use Scenario: Fine-tuning output voltage of adjustable LDOs (e.g., LM317) in programmable power supplies and test equipment. IC Role / Device Role / Timing Role: Replacing mechanical trimmer in feedback divider network (R1–R2), with RW connected to ADJ pin. Use Value: Enables remote or automated calibration; retains last-trimmed value through power cycles-critical for repeatability in production test. |
Use Scenario: Calibrating input offset and closed-loop gain in instrumentation amplifiers and sensor signal chains. IC Role / Device Role / Timing Role: Two-terminal variable resistor in op-amp feedback or nulling network to adjust gain slope or zero-point error. Use Value: Achieves <±0.2% relative linearity for sub-mV offset correction-superior to mechanical pots subject to vibration and wear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5243BRMZ10 | 2-channel, I²C interface, 10 kΩ, ±30% RTOTAL tolerance, 64 taps, no NV memory | Requires external MCU for state retention; better for multi-channel sync but lacks power-on preset | Choose when dual independent pots and I²C bus compatibility outweigh need for nonvolatile recall |
| MCP41010-I/P | Single-channel, SPI interface, 10 kΩ, ±20% RTOTAL, volatile wiper register only (no NV memory) | Needs host MCU to reload wiper on power-up; lower cost but no autonomous startup behavior | Choose for cost-sensitive designs where firmware manages all trim states and no power-loss recovery is required |
Compared with AD5243BRMZ10 and MCP41010-I/P, the X9318WS8IT1 uniquely combines single-channel simplicity, guaranteed 100-year nonvolatile storage, and minimal 3-wire control-making it optimal for unattended, maintenance-free analog calibration where deterministic power-on behavior is mandatory.
Availability
X9318WS8IT1 is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias control, and voltage regulator output trim requiring stable component supply, long-term calibration integrity, and RoHS-compliant packaging.
Supply support for X9318WS8IT1 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) is a U.S.-based analog and mixed-signal semiconductor company specializing in precision power management, interface, and data conversion ICs.
The X9318WS8IT1 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in high-reliability analog calibration tasks where nonvolatile setting retention and temperature stability are critical.
FAQ
What is the operating temperature range for the X9318WS8IT1?
The X9318WS8IT1 is rated for operation from -40°C to +85°C. This extended industrial temperature range is confirmed in the ordering information table of the FN8184 datasheet, where the "I" suffix denotes the -40°C to +85°C grade. The device maintains its specified linearity, endurance, and nonvolatile retention performance across this full range.
Does the X9318WS8IT1 require an external microcontroller to function?
No-the X9318WS8IT1 operates autonomously with simple digital GPIO signals: CS, U/D, and INC. It does not require a microcontroller for basic wiper movement or nonvolatile store/recall. However, a host controller is typically used to coordinate timing, sequence commands, and manage system-level calibration logic-but the X9318WS8IT1 itself contains all necessary control circuitry and memory on-die.
How is wiper position stored and recalled in the X9318WS8IT1?
Wiper position is stored in nonvolatile memory when CS transitions HIGH while INC is held HIGH. On subsequent power-up, the X9318WS8IT1 automatically recalls the last stored value and positions the wiper accordingly within 500 µs. This behavior is intrinsic to the device architecture and requires no external components or initialization code.
Can the X9318WS8IT1 be used with supply voltages other than 5 V?
The X9318WS8IT1 is specified for VCC = 4.5–5.5 V only. Operation outside this range violates Absolute Maximum Ratings (e.g., VCC to VSS must remain ≤+7 V), risks latch-up or parametric failure, and voids guaranteed performance-including wiper linearity, endurance, and memory retention. It is not rated for 3.3 V or 12 V operation.
What is the maximum allowable voltage across RH and RL terminals of the X9318WS8IT1?
The absolute maximum voltage from RH or RL to VSS is +10 V, but the recommended operational limit is 0–8 V as specified under "RH/RL terminal voltage" in the Potentiometer Characteristics table. Exceeding 8 V may degrade long-term reliability and invalidate the ±1% linearity guarantee, even if within absolute ratings.
X9318WS8IT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- XDCP™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 100
- Resistance (Ohms):
- 10k
- Interface:
- Up/Down (U/D, INC, CS)
- Memory Type:
- Non-Volatile
- Voltage - Supply:
- 5V
- Features:
- -
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- ±300ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
- Operating Temperature:
- -40°C ~ 85°C
- Resistance - Wiper (Ohms) (Typ):
- 40
X9318WS8IT1 FAQ
1.How can I place an order for X9318WS8IT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for X9318WS8IT1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for X9318WS8IT1 reliable?
The price and inventory of X9318WS8IT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X9318WS8IT1 is usually 5 days.
3.What payment methods are accepted for X9318WS8IT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X9318WS8IT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X9318WS8IT1?
X9318WS8IT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X9318WS8IT1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for X9318WS8IT1?
For technical support, including X9318WS8IT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X9318WS8IT1 requirements.
6.How does Aetrix verify that X9318WS8IT1 is sourced from the original manufacturer or authorized distributors?
All X9318WS8IT1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that X9318WS8IT1 meets industry standards.
7.What is the process for return or replacement of X9318WS8IT1?
All X9318WS8IT1 units undergo pre-shipment inspection (PSI). If there is an issue with X9318WS8IT1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The X9318WS8IT1 part is unused and in its original packaging.
Return procedure for X9318WS8IT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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