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