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.
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
Applications
Portable CD players
Dimension (Unit : mm)
*Derating : 5mW/˚C for operation above Ta=25˚C
QFP44
33 23
22
12
1
34
44
10.0 – 0.2
14.0 – 0.3
0.35 – 0.1
1
0
.
0

–

0
.
2
1
4
.
0

–

0
.
3
1
.
2
0
.
0
5
2
.
1
5

–

0
.
1
0.15 – 0.1
0.8
11
0.15
BU9348K
RAM controller for CD player
Absolute Maximum Ratings (Ta=25˚C)
Supply voltage
Power dissipation
Operating temperature range
Storage temperature range
Parameter Symbol Limits Unit
Vcc
Pd
Topr
Tstg
500
+75-25 ~
4.5-0.3 ~
+125-55 ~
mW
˚C
˚C
V
Supply voltage VCC 3.02.7 3.6 V
Recommended Operating Conditions (Ta=25˚C)
Parameter Min. Max. UnitTyp.Symbol
*