BU9348K

Overview

The BU9348K is a RAM controller IC designed for CD players to protect against pop noise using DRAM. It supports four DRAM types: 16M, 4Mx2, 4M, and 1M. The device offers selectable shockproof modes (4-bit, 5-bit, 6-bit, non-compression) and through mode. It operates at up to x4 speed with a supply voltage of 2.7V to 3.6V. Current consumption ranges from 1.8mA in through mode to 20mA in shockproof mode. It includes a built-in digital attenuator, soft mute function, and extended I/O.

Feature Summary

• Incorporates functions to electrically protect against pop noise when used with DRAM in CD players.
• Supports four specific DRAM configurations including 16MDRAM, 4MDRAMx2, 4MDRAM, and 1MDRAM.
• Provides selectable operational modes including four shockproof variants and a standard through mode.
• Integrates a digital attenuator, soft mute capability, and extended input/output functions.

Applications

• Portable CD players

Procurement Notes

Verify the exact DRAM configuration required for your design, as the IC supports multiple memory types. Confirm that the operating conditions align with the specified supply voltage range of 2.7V to 3.6V. Ensure thermal management accounts for power dissipation derating above 25°C. Check for any specific interface timing requirements related to the maximum x4 speed operation.

Selection Notes

Select this component if your application requires integrated RAM control for CD player audio processing. Consider the available shockproof modes based on your mechanical vibration environment. Evaluate the current consumption differences between shockproof and through modes for battery life optimization. Verify compatibility with the supported DRAM types before finalizing the bill of materials.

Part Context

This part belongs to ROHM Semiconductor's family of audio-related integrated circuits specifically tailored for optical disc playback devices. It serves as a bridge between the main microcontroller and the dynamic random-access memory, handling data buffering and protection logic essential for high-quality audio reproduction.

Replacement Considerations

No direct replacement part numbers are documented in the provided source material. Engineers should evaluate other ROHM RAM controllers or general-purpose memory interface chips, ensuring they meet the specific DRAM support and shockproof mode requirements.