IP4856CX25/CZ

Specialized Overview

The IP4856CX25/C 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 a nominal supply of 1.7 V to 3.6 V. It supports SDR104, SDR50, DDR50, SDR25, SDR12, high-speed (50 MHz), and default-speed (25 MHz) modes. The device features an integrated 100 mA low dropout regulator for card-side I/Os, built-in EMI filters, and robust ESD protection rated at 8 kV contact discharge per IEC 61000-4-2 Level 4. It utilizes a 25-ball WLCSP package with a 0.4 mm pitch.

Specialized Feature Summary

• Supports up to 208 MHz clock rates for SD 3.0 compliant data transfer
• Includes an integrated 100 mA low dropout voltage regulator for card-side power
• Features integrated EMI filters to suppress digital I/O harmonics
• Provides 8 kV IEC 61000-4-2 Level 4 ESD protection on card-side pins

Specialized Applications

• Smartphones
• Mobile handsets
• Digital cameras
• Tablet PCs
• Laptop computers
• SD, MMC or microSD card readers

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure correct package configuration and marking codes. Confirm that the component status remains in production before finalizing design-in decisions. Cross-reference the datasheet revision date to ensure all latest electrical characteristics and mechanical dimensions are accounted for in the schematic and layout.

Specialized Selection Notes

Select this component when interfacing SD memory cards requiring dual voltage translation between host and card domains. Ensure the host supply voltage falls within the 1.7 V to 3.6 V range and the card operates at 1.8 V or 2.9 V. Verify PCB layout capabilities for the 25-ball WLCSP package, specifically regarding micro-via requirements and solder mask apertures for reliable assembly.

Specialized Part Context

This device belongs to Nexperia's portfolio of integrated level translators designed for mobile multimedia applications. It consolidates voltage shifting, regulation, and protection functions into a single compact package, reducing the bill of materials and board space compared to discrete solutions. It is part of the broader family of SD card interface controllers optimized for high-speed data transmission standards.

Specialized Replacement Considerations

IP4855CX25

Specialized FAQ

How does the device handle clock synchronization delays?

The device includes a feedback channel (CLK_FB) that transmits the clock signal back to the host side. This compensates for propagation delays introduced by the voltage translator and PCB tracks, ensuring accurate timing margins for data read-back from the memory card.

What is the function of the SEL pin?

The SEL pin selects the output voltage level of the internal low dropout regulator. A HIGH level configures the regulator for 1.8 V signaling, while a LOW level configures it for 2.9 V signaling, allowing compatibility with different SD card voltage standards.

How is ESD stress managed to protect the host?

The device employs a zero-clamping concept where level shifting buffers keep ESD stress away from the host. Any electrostatic discharge on the card-side pins is discharged directly to the supply ground, preventing damage to the host controller.