Renesas ISL22323TFV14Z

Overview

ISL22323TFV14Z from Renesas (formerly Intersil) is a dual digitally controlled potentiometer (XDCP) in 14-lead TSSOP, featuring 256-tap resolution, I²C interface, 100kΩ end-to-end resistance, ±45 ppm/°C tempco, and extended industrial temperature range (-40°C to +125°C). It enables precision analog trimming in bipolar supply systems such as programmable gain amplifiers and sensor calibration circuits.

For engineers reviewing the ISL22323TFV14Z datasheet, ISL22323TFV14Z pinout, ISL22323TFV14Z application, or ISL22323TFV14Z equivalent, key selection criteria include dual DCP channel independence, non-volatile wiper recall at power-up, low 70Ω typical wiper resistance, <4µA standby current, and compatibility with I²C buses supporting up to eight devices via A0–A2 address pins.

Technical Context

The ISL22323TFV14Z integrates two independent 8-bit digitally controlled potentiometers on a monolithic CMOS die, each with volatile Wiper Registers (WR0/WR1) and non-volatile Initial Value Registers (IVR0/IVR1). Wiper position is updated via I²C commands with 1.5µs response time, and power-on recall loads IVR contents into WR registers within 5ms.

It supports true bipolar operation with dual supplies (VCC = +2.25V to +5.5V, V− = −2.25V to −5.5V), enabling voltage divider configurations where RLi terminals connect to V− and RHi to VCC. The device includes 13 general-purpose non-volatile registers for lookup table storage and implements "make-before-break" switching to prevent open-circuit transients during wiper transitions.

Key Specifications

Pinout & Package

ISL22323TFV14Z uses a 14-lead TSSOP package (M14.173), RoHS-compliant, with exposed pad not present (QFN variant has EPAD; TSSOP does not).

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 ISL22323TFV14Z uniquely supports true bipolar operation with dedicated V− pin, retains full -40°C to +125°C qualification, and delivers lower 70Ω wiper resistance-critical for high-accuracy closed-loop analog designs.

Availability

ISL22323TFV14Z is available at Aetrix Electronics and suitable for programmable gain amplifiers, sensor calibration systems, industrial DAC post-processing, and audio channel balancing requiring stable component supply across extended temperature ranges.

Supply support for ISL22323TFV14Z 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 maintains its high-performance analog portfolio, emphasizing precision mixed-signal ICs for industrial, automotive, and communications infrastructure.

The ISL22323TFV14Z belongs to Renesas' XDCP (eXternally Digitally Controlled Potentiometer) product line, designed specifically for replacing mechanical potentiometers in automated calibration, adaptive analog signal conditioning, and reconfigurable analog front-ends.

FAQ

What is the maximum I²C clock frequency supported by the ISL22323TFV14Z?

The ISL22323TFV14Z supports standard-mode I²C operation up to 400kHz. This is confirmed in the datasheet's Serial Interface Specs table (page 7), where fSCL is specified as 400kHz. Operation beyond this frequency is not guaranteed and may result in communication failures or register access errors. The device does not support fast-mode plus (1MHz) or high-speed mode.

Does the ISL22323TFV14Z require external pull-up resistors on SDA and SCL lines?

Yes, the ISL22323TFV14Z requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. The datasheet specifies Rpu values ranging from ~1kΩ to 20kΩ depending on bus capacitance (Cb), with recommended values of ~2kΩ–2.5kΩ for Cb = 400pF and ~15kΩ–20kΩ for Cb = 40pF. Omitting pull-ups will prevent proper I²C communication.

Can the ISL22323TFV14Z operate with only a single positive supply (e.g., VCC = 3.3V, V− = GND)?

No - the ISL22323TFV14Z requires both VCC and V− supplies to be actively driven within their specified ranges (VCC = +2.25V to +5.5V; V− = −2.25V to −5.5V). Connecting V− to GND violates absolute maximum ratings and will damage the device. For single-supply applications, consider alternatives like the MCP46xx series, which lack V− pins and support rail-to-rail operation.

How many times can the non-volatile registers of the ISL22323TFV14Z be written before wear-out?

The non-volatile registers of the ISL22323TFV14Z are rated for 1,000,000 write cycles per bit, as stated in the EEPROM Specification section (page 7). This endurance applies to both the two Initial Value Registers (IVR0/IVR1) and the thirteen General Purpose registers. Data retention is guaranteed for 50 years at temperatures ≤+55°C, making it suitable for infrequent calibration updates in long-lifecycle industrial equipment.

What is the function of the ACR register in the ISL22323TFV14Z memory map?

The Access Control Register (ACR) at address 0x10 controls volatile vs. non-volatile register access and shutdown mode. Bit 7 (VOL) selects whether I²C writes target volatile Wiper Registers (VOL=1) or non-volatile Initial Value Registers (VOL=0). Bit 6 (SHDN) enables or disables shutdown mode, reducing current to <4µA. Bit 5 (WIP) is read-only and indicates ongoing non-volatile write operations - writes to WR or ACR are blocked while WIP=1.