BU7331EKN-E2

Overview

The BU7331EKN is a 3-channel programmable clock generator integrating three PLLs, controlled via a 2-wire serial interface. It accepts reference frequencies from 5.0 MHz to 48.0 MHz (crystal or non-crystal) and generates output clocks ranging from 5.0 MHz to 75.0 MHz. The device operates with separate supply voltages: VDD_CORE at 1.65 V to 1.95 V, and VDD_CLK/VDD_SIF at 1.40 V to 3.60 V. Each output channel includes an individual level shifter. Electrical characteristics specify a maximum operating circuit current of 10.0 mA for the core when all three PLLs are active.

Feature Summary

• Integrates 3 independent PLLs for simultaneous multi-clock generation
• Frequency settings managed via 2-wire serial interface (SCL/SDA)
• Supports crystal input (5.0–27.0 MHz) and direct clock input (5.0–48.0 MHz)
• Each output channel features an integrated level shifter

Applications

• Mobile phones
• Digital Still Cameras (DSC)
• DVD players

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and tape/reel specifications. Confirm that the intended application environment remains within the specified operating temperature range of -20°C to +75°C. Ensure power supply sequencing adheres to the recommended guidelines to prevent instantaneous rush currents between the multiple voltage domains.

Selection Notes

Select this component when a design requires generating up to three distinct clock frequencies from a single reference source using serial configuration. Verify that the target load capacitance requirements (10 pF max for 5–48 MHz outputs at lower voltages; 15 pF max otherwise) align with the receiving circuitry. Ensure the system architecture can accommodate the separate power domains for the core logic and I/O interfaces.

Part Context

This component belongs to ROHM Semiconductor's portfolio of timing devices designed for digital consumer electronics. It utilizes MULTI-PLL technology to handle frequency changes through register rewriting, facilitating efficient parts management in products requiring multiple clock standards. The HQFN20V package provides a compact surface-mount solution suitable for space-constrained mobile applications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult the manufacturer's database for cross-reference information regarding pin-compatible or functionally equivalent alternatives.