X9455YV24IZ-2.7

Overview

The X9455YV24IZ-2.7 is a dual two-wiper Digitally-Controlled Potentiometer (XDCP) manufactured by Renesas Electronics Corporation, formerly Intersil. It integrates two independent potentiometers on a monolithic CMOS IC, each featuring 256 resistive tap points and two wipers for a total of four adjustable terminals. The device operates within a supply voltage range of 2.7V to 5.5V and offers a total resistance of 2.8kΩ. It supports both a 2-wire serial interface and an Up/Down interface for wiper control. Non-volatile memory retains wiper positions across power cycles, with data retention specified at 100 years.

Feature Summary

• Dual two-wiper architecture providing four independent wiper terminals (RW0A, RW0B, RW1A, RW1B).
• 256 discrete resistor tap points per array, delivering 0.4% resolution.
• Non-volatile storage with four Data Registers per wiper; power-on recall loads Level 0 registers automatically.
• Dual interface support: 2-wire serial bus (I2C-compatible) and Up/Down digital interface.

Applications

• Programming bias voltages in analog circuits.
• Configuring window comparators.
• Implementing three-resistor programmable networks.

Procurement Notes

This component is designated as obsolete with no recommended replacement available from the manufacturer. Verification of authenticity is critical due to potential surplus market availability. Users must confirm the specific ordering suffix 'Z' indicates Pb-free plus anneal compliance and RoHS status. Supply chain sourcing should rely on authorized distributors or verified surplus vendors, acknowledging the end-of-life status.

Selection Notes

Select this part when a dual-channel solution with dual wipers per channel is required. The 2.8kΩ resistance value is specific to the 'Y' suffix variant; verify against system impedance requirements. Ensure the design accommodates the 24-pin TSSOP package dimensions. Consider that the device requires external pull-up resistors on the SDA line for the 2-wire interface operation.

Part Context

The X9455 belongs to the XDCP family of solid-state potentiometers. It replaces mechanical potentiometers in applications requiring remote adjustment or automated calibration. The 'YV24IZ-2.7' designation specifies the 2.8kΩ resistance, 24-lead TSSOP package, industrial temperature range (-40°C to +85°C), and Pb-free construction.

Replacement Considerations

The datasheet explicitly states 'NO RECOMMENDED REPLACEMENT'. Designers must evaluate pin-compatible alternatives or redesign the PCB layout if transitioning to a new component, as no direct functional substitute is provided by the manufacturer.

FAQ

How does the device handle wiper position recall upon power-up?

Upon power-up, the contents of the Level 0 non-volatile Data Registers (DR0A0, DR0B0, DR1A0, DR1B0) are automatically loaded into their respective volatile Wiper Counter Registers (WCRs), setting the wipers to their last saved positions.

What is the maximum endurance of the non-volatile memory?

The non-volatile memory supports a minimum endurance of 100,000 data changes per bit per register.

Can the 2-wire interface be used simultaneously with the Up/Down interface?

No. When the Chip Select (CS) pin is low, the Up/Down interface is enabled and the 2-wire interface is disabled. When CS is high, the 2-wire interface is enabled.