Renesas ISL22323TFR16Z

Overview

ISL22323TFR16Z from Renesas (formerly Intersil) is a dual digitally controlled potentiometer (DCP) IC with I²C interface, 256-tap resolution per channel, 100 kΩ end-to-end resistance, ±45 ppm/°C tempco, and dual supply operation (VCC = 2.25–5.5 V, V− = −2.25 to −5.5 V). It enables precision bipolar voltage divider and rheostat configurations in programmable gain control and offset trimming circuits.

For engineers reviewing the ISL22323TFR16Z datasheet, ISL22323TFR16Z pinout, ISL22323TFR16Z application, or ISL22323TFR16Z equivalent, key selection criteria include its 16-lead QFN package, non-volatile wiper position storage, 13 general-purpose EEPROM registers, shutdown current <4 µA, and guaranteed operation from −40°C to +125°C.

Technical Context

The ISL22323TFR16Z integrates two independent 8-bit DCPs implemented as resistor ladders with CMOS switch matrices, each controlled by a volatile Wiper Register (WRi) and initialized from a non-volatile Initial Value Register (IVRi) at power-up. Its "make-before-break" switching ensures glitch-free wiper transitions.

It supports full I²C protocol compliance (400 kHz max), three address pins (A0–A2) enabling up to eight devices on one bus, and dual-supply biasing that permits rail-to-rail analog signal handling between V− and VCC - critical for bipolar op-amp feedback networks and precision sensor conditioning.

Key Specifications

Pinout & Package

ISL22323TFR16Z uses a 16-lead QFN package (4 mm × 4 mm, L16.4x4A) with exposed die pad internally connected to V−. Thermal land for EPAD should be connected to V− plane or left floating per TB389.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ100 and MCP4651T-104E/ST, the ISL22323TFR16Z uniquely delivers dual-channel DCP functionality with true bipolar supply capability in a compact 4×4 mm QFN - essential for space-constrained, high-accuracy analog systems requiring V− referenced signal conditioning.

Availability

ISL22323TFR16Z is available at Aetrix Electronics and suitable for programmable gain amplifiers, offset trimming circuits, configurable filter networks, and LED current regulation requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ISL22323TFR16Z 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 acquired Intersil in 2017 and continues to support its precision analog portfolio, including digitally controlled potentiometers and interface ICs for industrial and automotive markets.

The ISL22323TFR16Z belongs to Renesas' XDCP (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical trimmers in high-reliability, programmable analog signal conditioning applications.

FAQ

What is the package type and footprint of the ISL22323TFR16Z?

The ISL22323TFR16Z uses a 16-lead QFN package measuring 4 mm × 4 mm (L16.4x4A), with an exposed die pad internally tied to V−. Its footprint requires no solder mask defined for the EPAD - it may be connected to a V− copper pour or left floating per Intersil TB389 guidelines. This compact package reduces PCB area versus TSSOP alternatives while supporting high-density analog layouts.

Does the ISL22323TFR16Z support true bipolar operation, and how is it implemented?

Yes, the ISL22323TFR16Z supports true bipolar operation via dedicated V− (−2.25 V to −5.5 V) and VCC (2.25 V to 5.5 V) supplies. This allows DCP terminals (RH, RL, RW) to handle analog signals spanning from V− to VCC without clipping - essential for op-amp circuits requiring negative reference injection or symmetric rail-to-rail signal conditioning. The internal architecture isolates analog ladder biasing from digital logic grounds.

How does non-volatile memory function in the ISL22323TFR16Z, and what is its endurance?

The ISL22323TFR16Z stores wiper positions in non-volatile Initial Value Registers (IVR0/IVR1) with 1,000,000 write cycles endurance and 50-year data retention at ≤+55°C. At power-up, IVR contents auto-load into volatile Wiper Registers (WR0/WR1). User code can write to IVRs via I²C using the Access Control Register (ACR) VOL bit; writes trigger self-timed 12–20 ms internal EEPROM cycles confirmed by WIP flag.

Can both DCP channels operate independently, and what is their matching performance?

Yes, both DCP channels (DCP0 and DCP1) operate fully independently - each has its own WRi, IVRi, and terminal pins (RH/RL/RW). Their matching is specified as ±2 LSB (VMATCH) when wipers are set to identical tap positions under equal terminal voltages. This tight tracking enables precision differential gain control, balanced attenuator networks, and matched sensor excitation without external calibration.

What I²C address configuration options does the ISL22323TFR16Z support?

The ISL22323TFR16Z uses three hardware address pins (A0, A1, A2) to configure the three LSBs of its 7-bit I²C slave address. With A2–A0 grounded, the base address is 0x2C (write) / 0x2D (read); all combinations yield addresses from 0x28 to 0x2F. This allows up to eight ISL22323TFR16Z devices on a single I²C bus - ideal for multi-channel calibration systems or modular sensor nodes.