Renesas ISL23328TFVZ-T7A

Overview

ISL23328TFVZ-T7A from Renesas (formerly Intersil) is a dual, volatile, 128-tap digitally controlled potentiometer with I²C interface, 100kΩ end-to-end resistance, 14-lead TSSOP package, and extended industrial temperature range (–40°C to +125°C). It functions as two independent programmable resistive dividers or rheostats in battery-powered instrumentation, power supply margining, and sensor trimming circuits.

For engineers reviewing the ISL23328TFVZ-T7A datasheet, ISL23328TFVZ-T7A pinout, ISL23328TFVZ-T7A application, or ISL23328TFVZ-T7A equivalent, key selection criteria include its dual-channel 128-tap resolution, independent VLOGIC (1.2V–5.5V) support for low-voltage bus interfacing, shutdown mode with wiper-to-RL connection, and guaranteed monotonicity in both voltage divider and rheostat modes.

Technical Context

The ISL23328TFVZ-T7A integrates two independent DCP cores on a monolithic CMOS die, each with an 8-bit volatile wiper register (WR0/WR1) directly accessible via I²C. Its "make-before-break" switch architecture ensures glitch-free wiper transitions, and power-on defaults to mid-scale (64 decimal) for both channels.

It features separate analog (VCC = 1.7V–5.5V) and logic (VLOGIC = 1.2V–5.5V) supplies, enabling direct interfacing with sub-1.8V microcontrollers without level shifters. Shutdown mode disconnects the resistor array and internally connects RW to RL through a 2kΩ path, reducing leakage and system-level power consumption.

Key Specifications

Pinout & Package

ISL23328TFVZ-T7A is housed in a Pb-free, RoHS-compliant 14-lead TSSOP (M14.173) package with 0.65mm lead pitch and exposed pad thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-100 and MCP45HV51-103E/ST, the ISL23328TFVZ-T7A uniquely delivers dual 128-tap control with true 1.2V I²C compatibility and 100kΩ resistance-making it optimal for space-constrained, low-power, dual-rail calibration in extended temperature environments.

Availability

ISL23328TFVZ-T7A is available at Aetrix Electronics and suitable for power supply margining, sensor circuit trimming, RF amplifier bias compensation, and battery-powered instrument gain adjustment requiring stable component supply across automotive, industrial, and medical OEM programs.

Supply support for ISL23328TFVZ-T7A 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 formed from the merger of Renesas Technology and NEC Electronics, delivering microcontrollers, analog, power, and mixed-signal solutions.

The ISL23328TFVZ-T7A belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, engineered for precision, low-power, and flexible digital calibration in harsh-environment analog signal chains.

FAQ

What is the default wiper position of the ISL23328TFVZ-T7A at power-on?

At power-on, both wiper registers (WR0 and WR1) of the ISL23328TFVZ-T7A reset to 64 decimal (0x40), positioning each wiper at the exact mid-scale point (64/127) of its respective 100kΩ resistor array. This behavior is guaranteed across the full –40°C to +125°C operating range and ensures a known, safe startup state for margining and calibration circuits.

Does the ISL23328TFVZ-T7A support true 1.2V I²C bus operation?

Yes, the ISL23328TFVZ-T7A supports true 1.2V I²C bus operation via its dedicated VLOGIC pin, which accepts 1.2V to 5.5V. The internal level shifter allows direct connection to 1.2V microcontrollers without external translation circuitry, while maintaining full I²C timing compliance (tSU:DAT ≥ 100ns, VOL ≤ 0.2×VLOGIC at 1.5mA).

Can the ISL23328TFVZ-T7A be used in rheostat mode, and what is its monotonicity guarantee?

Yes, the ISL23328TFVZ-T7A supports rheostat mode (RW–RL or RW–RH) with guaranteed monotonicity. For the 100kΩ version, differential non-linearity (RDNL) is ±0.15 MI over VCC = 2.7V–5.5V, ensuring stepwise resistance increase/decrease without reversal-critical for stable closed-loop bias control.

What happens to the wiper position during shutdown mode of the ISL23328TFVZ-T7A?

In shutdown mode (SHDN bit = 0 in ACR), the ISL23328TFVZ-T7A disconnects the resistor array end-to-end and internally connects each wiper (RW0/RW1) to its corresponding low terminal (RL0/RL1) via a 2kΩ series path. Wiper register values are retained, and wipers return to their pre-shutdown positions within 1.5µs after exit.

Is the ISL23328TFVZ-T7A pin-compatible with other variants in the ISL23328 family?

Yes, all 14-lead TSSOP variants of the ISL23328-including ISL23328TFVZ-T7A (100kΩ), ISL23328UFVZ-T7A (50kΩ), and ISL23328WFVZ-T7A (10kΩ)-share identical pinout, package outline (M14.173), and footprint. Only the end-to-end resistance value differs; no PCB redesign is needed when substituting between these TSSOP options.