Service Manual

IC3/4/11 4-Mbit SDRAM
IC HM5241605TT-17 TSOP
Parts No.: 315-0928-17
IC UPD4504161 GS-A 12 TSOP
Parts No.: 315-1022-12
• Top View & Pin Layout
1/05
VssO
1/06
1/07
CAS
1
AS
Vee
• Block Diagram
0:::
w
0
0
(.)
w
0
z
::!!:
::>
-'
0
(.)
o8
a::
UJ
il:
::;
g_
:IE
<
UJ
If)
z
UJ
If)
Vss
1/015
1/014
VssO
1/013
1/012
VeeO
1/011
1/010
1Vssa
1/09
1/08
VeeO
NC
DQMU
CLK
CKE
NC
GND
A7
A6
A5
A4
Vss
MEMORY ARRAY
BANKO
512 X 256 X HI bit
•Pin Name
Pin Name
A0-A9
I/00-I/015
AO -A7
cs
RAS
CAS
WE
DQMU
DQML
CLK
CKE
Ycc
Yss
YccO
YssO
NC
0:::
w
0
0
(.)
w
0
z
::!!:
::>
-'
0
(.)
-36-
IC HM5241605TT-15 TSOP
Parts No. : 315-0928-15
Function
Address inputs
Row addresses
AO-A8
Column addresses AO-A 7
Bank select address A9
Data inputs/outputs
Chip select
Row address strobe command
Column address strobe command
Write enable
High-order byte input/output mask
Low-order byte input/output mask
Clock input
Clock enable
Power supply
Ground
Power supply
of l/0 pins
Ground
of I/0 pins
Not connected
AO -A9
MEMORY ARRAY
BANK1
512 X 256 X 16 bit
CONTROL LOGIC &
TIMTING GENERATOR