Renesas ISL22511UFB8Z

Overview

ISL22511UFB8Z from Renesas Electronics is a solid-state, non-volatile, 32-tap digitally controlled potentiometer (XDCP™) with push-button control, shutdown mode, and UTQFN-10 package. It implements a 10kΩ resistor array with 31 elements and wiper switching network, operates from 2.7V to 5.5V, delivers ≤500Ω wiper resistance, and supports voltage divider or rheostat configurations for analog biasing in precision DC applications.

For engineers reviewing the ISL22511UFB8Z datasheet, ISL22511UFB8Z pinout, ISL22511UFB8Z application, or ISL22511UFB8Z equivalent, key selection considerations include its 3µA max standby current, ±80ppm/°C end-to-end tempco, AUTOSTORE/manual EEPROM store capability, fast/slow wiper scan modes, and shutdown behavior that disconnects RH and forces wiper to RL.

Technical Context

The ISL22511UFB8Z integrates a 5-bit up/down counter, nonvolatile EEPROM memory, and a 31-element resistor ladder with transfer gates. Wiper position is selected via decoded counter output driving one of 32 tap points - including endpoints - with no wraparound behavior at extremes.

Control logic includes internal pull-ups on PU/PD inputs, 15–28ms debounce, auto-transition from slow (100–390ms/tap) to fast (20–78ms/tap) scanning after 1s button press, and shutdown activation upon simultaneous PU/PD low for ≥2s. ASE enables AUTOSTORE (ASE held low at power-up) or manual store (ASE pulsed low >15ms).

Key Specifications

Pinout & Package

ISL22511UFB8Z uses a 10-lead Ultra Thin Quad Flat No-Lead (UTQFN) package measuring 2.1mm × 1.6mm × 0.45mm, RoHS-compliant, with wettable flanks and thermal pad (exposed die attach area). Pin 1 identifier is located in top-left corner per JEDEC MO-255UABD variant L10.2.1x1.6A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5171BRMZ-10 and MCP45HV51-103E/MF, ISL22511UFB8Z offers the smallest form factor (2.1×1.6mm), lowest system-level BOM count (no MCU or level-shifting needed), and fastest user interaction (push-button immediate response), making it optimal for space-constrained, cost-sensitive, human-adjusted analog trimming.

Availability

ISL22511UFB8Z is available at Aetrix Electronics and suitable for volume control, LED brightness control, contrast adjustment, and bias voltage programming requiring stable component supply across automotive, industrial, and consumer electronics programs.

Supply support for ISL22511UFB8Z 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 Corporation is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT applications.

The ISL22511UFB8Z belongs to Renesas' XDCP™ (eXternally Controlled Digital Potentiometer) family, designed specifically for replacing mechanical pots in harsh environments where reliability, small size, and nonvolatile trim are essential.

FAQ

What is the default wiper position of the ISL22511UFB8Z at power-up?

The ISL22511UFB8Z powers up with the wiper at the maximum scale position (0x1Fh, tap 31), placing it closest to the RH terminal. This factory-programmed state ensures predictable initial output voltage in voltage divider configurations and avoids unintended low-resistance paths at startup. The ISL22511UFB8Z retains this behavior regardless of prior EEPROM store state unless AUTOSTORE is enabled and a valid position was saved.

How does shutdown mode affect the ISL22511UFB8Z electrical connections?

In shutdown mode - activated by holding both PU and PD low for ≥2 seconds - the ISL22511UFB8Z disconnects the RH terminal from the resistor array and moves the wiper to the RL terminal. This eliminates current flow through the RH–RL path and minimizes leakage, reducing total device current to <100nA. The ISL22511UFB8Z exits shutdown immediately upon releasing PU or PD or pulling ASE low for >15ms.

Can the ISL22511UFB8Z be used in rheostat configuration, and how is it wired?

Yes, the ISL22511UFB8Z supports rheostat mode by leaving either RH or RL unconnected and using RW with the remaining fixed terminal. For example, connecting RW to RL and leaving RH open creates a variable resistance between RW and RL (0–10kΩ). This configuration is commonly used for LED current limiting or op-amp feedback adjustment. The ISL22511UFB8Z maintains ±0.5 MI DNL and ±1.5 MI INL in rheostat mode, ensuring monotonic resistance change.

What is the difference between AUTOSTORE and manual store on the ISL22511UFB8Z?

AUTOSTORE saves the current wiper position to EEPROM automatically after 2 seconds of inactivity on PU/PD when ASE is held low at power-up. Manual store requires pulsing ASE low for >15ms while PU/PD are inactive - useful for intentional calibration points. Both methods write to the same EEPROM location; the ISL22511UFB8Z performs store operations at 2mA peak ICC and completes within 5ms. Repeated stores do not degrade endurance under rated conditions.

Does the ISL22511UFB8Z support operation outside the recommended 2.7V–5.5V supply range?

No - the ISL22511UFB8Z is specified only for 2.7V to 5.5V VCC. Absolute maximum rating is 6V, but operation below 2.7V risks incomplete logic transitions, unreliable EEPROM writes, and degraded wiper resistance specs. Above 5.5V, internal protection diodes may conduct, increasing leakage and risking latch-up. The ISL22511UFB8Z datasheet explicitly prohibits extended operation outside the recommended range to ensure 1000000-cycle endurance and 50-year data retention.