IP4855CX25Z

Specialized Overview

The IP4855CX25Z is an SD 3.0-compliant 6-bit bidirectional dual voltage level translator designed to interface between memory cards operating at 1.8 V or 2.9 V and hosts with supply voltages from 1.2 V to 3.3 V. It supports SDR50, DDR50, SDR25, SDR12, High-Speed (50 MHz), and Default-Speed (25 MHz) modes. The device features an integrated switchable low-dropout voltage regulator for card-side I/Os, built-in EMI filters, and robust ESD protection rated at ±8 kV according to IEC 61000-4-2 Level 4. Packaged in a 25-ball WLCSP measuring 2.04 x 2.04 mm.

Specialized Feature Summary

• Integrated switchable low-dropout voltage regulator supplies card-side I/Os at 1.8 V or 2.9 V based on SEL pin configuration.
• Built-in EMI filters suppress higher harmonics of digital I/Os to reduce interference with sensitive mobile communications.
• Robust ESD protection architecture prevents host stress by discharging all transient energy to ground via the zero-clamping concept.
• Includes integrated pull-up and pull-down resistors, eliminating the need for external components.

Specialized Applications

• SD, MMC, and microSD memory card interfaces
• Mobile phones, smartphones, and tablet PCs
• Card readers in computers
• Digital cameras

Specialized Procurement Notes

Verify that the ordering suffix 'Z' corresponds to the specific tape-and-reel packaging variant required for automated assembly. Confirm RoHS compliance and halogen-free status as specified in the product data sheet. Ensure the host system provides adequate decoupling capacitors at VLDO, VSUPPLY, and VCCA pins to maintain stability during high-speed data transfers.

Specialized Selection Notes

Select this component when interfacing SD 3.0 compliant memory cards requiring 1.8 V signaling with host processors operating at different logic levels. The integrated regulator simplifies power management by removing the need for external LDOs. Ensure the PCB layout minimizes trace length between the translator and the card holder to preserve timing margins for DDR50 and SDR50 modes.

Specialized Part Context

This device belongs to Nexperia's portfolio of SD 3.0-compliant memory card integrated voltage level translators. It shares functional similarities with the IP4856CX25 but offers specific pin configurations and regulatory support tailored for standard SD card applications. Both devices utilize the same WLCSP25 package format for compact integration.

Specialized Replacement Considerations

IP4856CX25/CZ

Specialized FAQ

How does the device handle clock synchronization delays?

It provides a dedicated feedback channel (CLK_FB) to compensate for delays introduced by the voltage translator and PCB traces, ensuring accurate timing for data read-back operations.

What is the function of the VSD_REF pin?

The VSD_REF pin allows the internal voltage regulator to track the memory card supply voltage, ensuring optimal interoperability in 3 V signaling mode. If tracking is not desired, it should be connected to ground.

How are Write Protect and Card Detect signals protected?

These pins are equipped with IEC system-level ESD protections and internal pull-up resistors connected to the host supply (VCCA) to ensure correct detection states when no card is inserted.