RAM controller for CD player BU9348K Description Dimension (Unit : mm) The BU9348K is an IC incorporating function that can protect pop noise electrically by using DRAM together for CD players. This IC is available for four types of DRAM. Four shockproof mode(4bit, 5bit, 14.0 0.3 6bit, non-compression) and through mode can be 10.0 0.2 33 23 selected. 34 22 44 12 1 11 0.15 0.1 Features 0.8 0.35 0.1 0.15 1) Available for 4 types of DRAM (16MDRAM, 4MDRAMx2, 4MDRAM, 1MDRAM) QFP44 2) Four shockproof mode(4bit, 5bit, 6bit, non-compression) and through mode selectable 3) Available for x4 speed(Max.) 4) Built-in digital attenuator and soft mute function 5) Built-in extended I/O function Applications Portable CD players Absolute Maximum Ratings (Ta=25C) Limits Parameter Symbol Unit Supply voltage Vcc -0.3 4.5 V ~ * Pd 500 mW Power dissipation Operating temperature range Topr -25 +75 ~ C Tstg Storage temperature range -55 ~ +125 C *Derating : 5mW/C for operation above Ta=25C Recommended Operating Conditions (Ta=25C) Parameter Symbol Min. Typ. Max. Unit Supply voltage VCC 2.7 3.0 3.6 V 14.0 0.3 2.15 0.1 10.0 0.2 0.05 1.2 Electrical characteristics (Unless otherwise noted Ta=25C, VCC=3.0V) Symbol Parameter Min. Typ. Max. Unit Conditions IDD Shock proof mode Current consumption (Shock proof mode) - 8.9 20 mA Current consumption (Through mode) IDD mA Through mode - 1.8 5.0 Block diagram DRAM YSRDATA YLRCK YSCK YFLAG UC1~UC5 YFCLK CD-DSP BU9348K YBLKCK CLK(16.9344MHz) ZSRDATA ZLRCK NRESET ZSCK YDMUTE Micro controller YMCLK NWE NRAS YMDATA NCAS,NCAS2 A0~A10 YMLD D0~D3 ZSENSE NOE