Features
- Four potentiometers in one package
- 256 resistor taps–0.4% resolution
- SPI serial interface for write, read, and transfer operations of the potentiometer
- Wiper resistance: 100Ω typical at VCC = 5V
- 4 Nonvolatile data registers for each potentiometer
- Nonvolatile storage of multiple wiper positions
- Standby current <5µA max
- VCC: 2.7V to 5.5V operation
- 50kΩ version of total resistance
- 100 year data retention
- Single supply version of X9250
- Endurance: 100,000 data changes per bit per register
- 24 Ld SOIC, 24 Ld TSSOP
- Low power CMOS
- Pb-free (RoHS compliant)
X9251 Functional Diagram
Description
The X9251 integrates four digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated circuit. The digitally controlled potentiometers are implemented with a combination of resistor elements and CMOS switches. The position of the wipers are controlled by the user through the SPI bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and four nonvolatile Data Registers that can be directly written to and read by the user. The content of the WCR controls the position of the wiper. At power-up, the device recalls the content of the default Data Registers of each DCP (DR00, DR10, DR20, and DR30) to the corresponding WCR. The XDCP can be used as a three terminal potentiometer or as a two terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.
Parameters
| Attributes | Value |
|---|---|
| Resistance Taper | Linear |
| Taps (#) | 256 |
| Resistance Options (kΩ) | 50 |
| Channels (#) | 4 |
| Interface | SPI |
| Memory Type | Nonvolatile |
| Vcc (V) | 2.7 to 5.5 |
| Supply Current Icc (µA) | 50 |
| Single Supply Voltage Range (V) | 5.5 |
| Wiper Current (mA) | 4.4 |
| Wiper Resistance (ohms) | 200 |
| VL Terminal Voltage (Max) (V) | 5.5 |
| End-to-End Temperature Coefficient (ppm/°C) | 300 |
| Qualification Level | Standard |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TSSOP | 7.8 x 4.4 x 0.90 | 24 | 0.7 |
| Part Number | Status | Samples | Stock | RoHS | Package | Budgetary Price (USD) | Carrier Type | Moisture Sensitivity Level (MSL) | Country of Assembly | Country of Wafer Fabrication |
|---|---|---|---|---|---|---|---|---|---|---|
| X9251UV24IZ | Active | Available | In Stock | RoHS:EN | TSSOP | 1ku | $22.01 | Tube | 3 | MALAYSIA | USA |
| X9251UV24IZ-2.7 | Active | Available | In Stock | Contact | TSSOP | 1ku | $22.01 | Tube | 3 | MALAYSIA | USA |
| X9251UV24IZ-2.7T1 | Active | N/A | Out of Stock | Contact | TSSOP | 1ku | $22.01 | Reel | 3 | MALAYSIA | USA |
| X9251UV24Z | Active | Available | In Stock | RoHS:EN | TSSOP | 1ku | $23.02 | Tube | 3 | MALAYSIA | USA |
| X9251UV24Z-2.7 | Active | Available | Out of Stock | Contact | TSSOP | 1ku | $23.02 | Tube | 3 | MALAYSIA | USA |
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- Manual - Development ToolsPDF 2.16 MB AN1555 Sep 17, 2025
- Price Increase NoticePDF 257 KB PIN19006 Mar 01, 2019
- Product Change NoticePDF 237 KB PCN13065 Dec 24, 2013
- Product Change NoticePDF 121 KB PCN11113A Aug 13, 2012
- Product Change NoticePDF 120 KB PCN11113 Oct 31, 2011
- Application NotePDF 281 KB an1425 May 22, 2008AI-generated Summary: Digitally Controlled Potentiometers (DCPs) offer precise resistance control with configurations in both serial and parallel modes, featuring fixed resistors and various resistance options. The ISL22317 model provides 1% precision with 128 taps and can function as a two-terminal variable resistor or three-terminal potentiometer, delivering high accuracy and low temperature coefficient. DCPs can outperform DACs in fine tuning within limited ranges, offering better resolution with fewer bits. Resolution varies with voltage and tap count, as detailed in the provided tables. Usage guidelines and liability disclaimers emphasize proper application and safety considerations.
- Application NotePDF 750 KB an139 Jun 30, 2005AI-generated Summary: The document details the design of power supplies using Intersil’s XDCP mixed signal products. It explains four key circuit schematics: Front End, Power Mesh, Secondary Control, and Primary Control, highlighting their interconnections. The Front End converts AC line power to an unregulated 320V DC, incorporating protection and EMI filtering components. The Power Mesh is a single switch forward DC/DC converter that regulates 320V DC to 12V DC at 10A, using a cascode transistor arrangement and a digitally controlled switching frequency to meet EMI requirements.
- Application NotePDF 534 KB an133 Jun 06, 2005AI-generated Summary: The document explains how digitally controlled potentiometers (XDCPs) enable programmability in amplifier circuits by adjusting cutoff frequency and gain. It details the design of a non-inverting amplifier with variable resistors forming an RC low pass filter and gain control. Techniques to reduce potentiometer resistance for high-frequency applications are described, allowing gain from 1 to 2 and cutoff frequency from 130kHz to over 1MHz. The amplifier’s parameters are controlled via a serial bus, enabling computer-based customization.
- Application NotePDF 467 KB an1149 May 03, 2005AI-generated Summary: The document details circuits using Intersil digitally controlled potentiometers (X9C103, X9312) combined with op amps (LT1226, OP37, LT1028) for applications like null adjustment, amplifier biasing, and proportional-integral temperature control. It explains modes controlled by NADJ/ADJ signals, automatic nulling via feedback loops, and bias stabilization in high-output buffer amplifiers. The circuits optimize gain, bandwidth, noise, and minimize distortion and power consumption. It also covers clocking options for nulling and temperature control using digital potentiometers and comparators.
- Application NotePDF 280 KB an1157 Apr 29, 2005AI-generated Summary: Digitally controlled potentiometers (XDCPs) enable precise power supply and DC to DC converter control by allowing cascading configurations for fine and coarse voltage adjustments. These devices store wiper settings in nonvolatile memory, ensuring long-term reliability and simplifying manufacturing and testing. XDCPs improve repeatability, reduce human error, and enhance resistance to environmental stress, making them superior to mechanical potentiometers in power applications.
- Application NotePDF 324 KB an124 Apr 27, 2005AI-generated Summary: Digitally-controlled potentiometers have key analog parameters including number of taps (16 to 256), end-to-end resistance (1kΩ to 1MΩ), wiper resistance (~40Ω), wiper current (1-3mA), power rating (10-50mW), resolution, noise, linearity, and temperature coefficients. Voltage limits range from ±5V to ±15V on pins. Absolute linearity ensures accuracy within one least significant bit, while relative linearity guarantees tap-to-tap accuracy within 0.2 LSB. Temperature coefficients affect resistance stability. Various circuit techniques exist to mitigate these limitations. The document also includes usage notices, quality grades, and liability disclaimers from Renesas Electronics.
- Application NotePDF 239 KB an1155 Apr 21, 2005AI-generated Summary: Renesas Electronics provides circuit and software information solely for illustrating semiconductor product operations and application examples. Users bear full responsibility for integrating these into their designs. Renesas disclaims liability for damages from usage, alteration, or reverse engineering. Products are categorized into Standard and High Quality grades, with specific intended applications. Users must follow specified usage conditions and comply with laws, including export controls and environmental regulations. Safety measures are the user's responsibility, especially for critical applications. Contact Renesas sales for further details.
Recommended Documents (1)
Datasheets (1)
- Manual - Development ToolsPDF 2.16 MB AN1555 Sep 17, 2025
Manuals & Guides (1)
- Application NotePDF 281 KB an1425 May 22, 2008AI-generated Summary: Digitally Controlled Potentiometers (DCPs) offer precise resistance control with configurations in both serial and parallel modes, featuring fixed resistors and various resistance options. The ISL22317 model provides 1% precision with 128 taps and can function as a two-terminal variable resistor or three-terminal potentiometer, delivering high accuracy and low temperature coefficient. DCPs can outperform DACs in fine tuning within limited ranges, offering better resolution with fewer bits. Resolution varies with voltage and tap count, as detailed in the provided tables. Usage guidelines and liability disclaimers emphasize proper application and safety considerations.
- Application NotePDF 750 KB an139 Jun 30, 2005AI-generated Summary: The document details the design of power supplies using Intersil’s XDCP mixed signal products. It explains four key circuit schematics: Front End, Power Mesh, Secondary Control, and Primary Control, highlighting their interconnections. The Front End converts AC line power to an unregulated 320V DC, incorporating protection and EMI filtering components. The Power Mesh is a single switch forward DC/DC converter that regulates 320V DC to 12V DC at 10A, using a cascode transistor arrangement and a digitally controlled switching frequency to meet EMI requirements.
- Application NotePDF 534 KB an133 Jun 06, 2005AI-generated Summary: The document explains how digitally controlled potentiometers (XDCPs) enable programmability in amplifier circuits by adjusting cutoff frequency and gain. It details the design of a non-inverting amplifier with variable resistors forming an RC low pass filter and gain control. Techniques to reduce potentiometer resistance for high-frequency applications are described, allowing gain from 1 to 2 and cutoff frequency from 130kHz to over 1MHz. The amplifier’s parameters are controlled via a serial bus, enabling computer-based customization.
- Application NotePDF 467 KB an1149 May 03, 2005AI-generated Summary: The document details circuits using Intersil digitally controlled potentiometers (X9C103, X9312) combined with op amps (LT1226, OP37, LT1028) for applications like null adjustment, amplifier biasing, and proportional-integral temperature control. It explains modes controlled by NADJ/ADJ signals, automatic nulling via feedback loops, and bias stabilization in high-output buffer amplifiers. The circuits optimize gain, bandwidth, noise, and minimize distortion and power consumption. It also covers clocking options for nulling and temperature control using digital potentiometers and comparators.
- Application NotePDF 280 KB an1157 Apr 29, 2005AI-generated Summary: Digitally controlled potentiometers (XDCPs) enable precise power supply and DC to DC converter control by allowing cascading configurations for fine and coarse voltage adjustments. These devices store wiper settings in nonvolatile memory, ensuring long-term reliability and simplifying manufacturing and testing. XDCPs improve repeatability, reduce human error, and enhance resistance to environmental stress, making them superior to mechanical potentiometers in power applications.View More (13)
Application Notes & White Papers (13)
- Price Increase NoticePDF 257 KB PIN19006 Mar 01, 2019
- Product Change NoticePDF 237 KB PCN13065 Dec 24, 2013
- Product Change NoticePDF 121 KB PCN11113A Aug 13, 2012View More (6)
Product Notices (PCN, EOL, etc) (6)
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Knowledge Base
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What is the default wiper tap position for X9271 and X925x series of DCPs?
Question:What is the default wiper tap position for these parts? Answer: The default wiper tap position for these 256 tap DCPs (X9250, X9251, X9252, X9258, X9259, X9271) is 170.
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