Renesas ISL22326UFV14Z

Overview

ISL22326UFV14Z from Renesas Electronics is a dual digitally controlled potentiometer (XDCP™) with non-volatile wiper position storage, 128-tap resolution per channel, I²C interface, and 14-lead TSSOP package. It operates from 2.7V to 5.5V, supports shutdown mode (≤5 µA), and delivers 10 kΩ or 50 kΩ end-to-end resistance options. It serves as a precision programmable resistor in analog signal conditioning circuits for industrial sensor calibration.

For engineers reviewing the ISL22326UFV14Z datasheet, ISL22326UFV14Z pinout, ISL22326UFV14Z application, or ISL22326UFV14Z equivalent, this page provides verified electrical specifications, validated pin functions, confirmed dual-DCP use cases in voltage divider and rheostat modes, and two industry-validated alternative parts with documented functional and parametric differences.

Technical Context

The ISL22326UFV14Z integrates two independent 7-bit (128-tap) digitally controlled potentiometers on a single monolithic CMOS die, each with volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR). Wiper positioning is controlled exclusively via I²C commands using address pins A0–A2, enabling up to eight devices on one bus.

Its architecture employs resistor ladder arrays with CMOS switches operating in make-before-break mode, ensuring glitch-free transitions. Power-up recalls IVR contents into WRs, and shutdown mode (activated by SHDN pin or ACR bit) opens RH–RL paths while shorting RW to RL - preserving register state and enabling fast reactivation (<1.5 µs recall time).

Key Specifications

Pinout & Package

ISL22326UFV14Z uses a 14-lead TSSOP package (JEDEC MO-153, 5.0 mm × 4.4 mm × 1.2 mm). Pin 1 is VCC; pins 4 and 9 are NC; exposed pad is not present in TSSOP variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP45HV51-103E/ST, the ISL22326UFV14Z uniquely combines dual 128-tap DCPs, integrated non-volatile wiper storage, hardware shutdown pin, and I²C compatibility - making it optimal for space-constrained, self-calibrating industrial analog systems requiring zero-BOM-addition persistence.

Availability

ISL22326UFV14Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifiers, audio volume control, and power supply trim applications requiring stable component supply, long-term calibration retention, and RoHS-compliant packaging.

Supply support for ISL22326UFV14Z 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 specializing in microcontrollers, analog power, and mixed-signal solutions for automotive, industrial, and IoT markets.

The ISL22326UFV14Z belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical potentiometers in high-reliability analog tuning applications where programmability, non-volatility, and thermal stability are critical.

FAQ

What is the default wiper position of ISL22326UFV14Z at power-up?

At initial power-up before non-volatile recall completes, both wipers default to position 40h (64 decimal), placing them near the midpoint of their respective resistor arrays. Once VCC exceeds the power-on reset threshold (2.0–2.6 V), the device loads the stored IVR values into the WR registers - restoring the last-saved wiper positions. This behavior is guaranteed by the internal power-up sequence described in Section 5.1 of the ISL22326UFV14Z datasheet.

Does ISL22326UFV14Z support both voltage divider and rheostat configurations?

Yes, the ISL22326UFV14Z supports both configurations. In voltage divider mode, RH and RL are biased at different potentials (e.g., VCC and GND), and RW provides a programmable tap point. In rheostat mode, either RH or RL is left unconnected while RW and the other terminal form a two-terminal variable resistor. The datasheet confirms monotonic INL/DNL performance in both modes (Pages 5–6, Sections 2.4.1 and 2.4.2), with specified RINL, RDNL, and matching parameters.

How does the SHDN pin interact with the ACR shutdown bit in ISL22326UFV14Z?

The SHDN pin and ACR[6] bit operate as a logical AND: shutdown activates only when both are asserted (pin = LOW and bit = 0). Table 3 on Page 14 of the ISL22326UFV14Z datasheet defines this truth table explicitly. This dual-control mechanism allows flexible system-level power management - e.g., hardware-initiated shutdown via pin, or software-controlled shutdown via I²C write to ACR - without unintended activation.

Can ISL22326UFV14Z be used with 1.8 V I²C buses?

No, ISL22326UFV14Z is not compatible with 1.8 V I²C buses. Its absolute minimum VCC is 2.7 V (Page 4, Section 2.2), and its digital input thresholds are defined as VIH ≥ 0.7×VCC and VIL ≤ 0.3×VCC (Page 7, Section 2.5). At 1.8 V, the required VIH would be ≥1.26 V - below standard 1.8 V logic HIGH levels - risking unreliable communication. Use only within 2.7–5.5 V supply range.

What is the maximum capacitive load the ISL22326UFV14Z SDA/SCL lines can drive?

The ISL22326UFV14Z SDA and SCL pins support total bus capacitance (Cb) up to 400 pF, as specified in Section 2.5 (Page 8). For Cb = 400 pF, the recommended external pull-up resistor is 2–2.5 kΩ to meet rise/fall time limits (tR/tF ≤ 250 ns). Exceeding 400 pF risks violating I²C timing specs like tSU:DAT and tHD:DAT, leading to communication failures - confirmed by timing parameters in Tables on Pages 7–8 of the ISL22326UFV14Z datasheet.