Service manual
IC2
IC
HM65256BLFP-12
• Top View & Pin Layout
• Operation Mode
CE
OE
L
L
L
X
L H
H
L
H
I
H
IC3
IC
11
PD4364G-15L
IC
MB8464A-1
OLL
I
1/0
0
-1/0
7
CE
OE
WE
Vee
GND
WE
I
H
L
H
X
X
• Top View & Pin Layout
Vee
Wf
CE
7
As
A5
Ag
A4
All
Ao-AI2
A a
O'E
OE
1 A
10
1/01-1/0g
~I
Vee
• Block Diagram
: Data in/outputs
: Chip enable input
: Output enable input
: Write enable input
:
+SV
:OV
1/0
Mode
LowZ
Read
HighZ
Write
HighZ -
HighZ
Refresh
HighZ Standby
IC FCB61C65L-70T
• Block Diagram
A-
Ao
As
A7
As
9
A1o
An
A12
: Address inputs
-
-
-
-
-
ADDRESS
ROW
-
BUFFER
DECODER
-
-
1-
-
: Output enable input
1/0
1
: Data in/outputs
INPUT
DATA
:
+SV
power supply
110
5
CONTROL
1
1/0s
CE
1
•
CE
2
:
Chip enable 1. 2 inputs
1/07
GND
:Ground
110
6
WE : Write enable input
1
1/05
NC
: No connection
~1
CE
2
OE
~
~
-20-
1-
115.5311
BIT
(2511
X
2511)
MEMORY
CELL
ARRAY
t--
l
J
r--
:-
t--
SENSE
SWITCH
OUTPUT
1--
-
COLUMN
CONTROL
DECODER
I
J
I
ADDRESS
I
BUFFER
1 1 1 1 1
0 I 2 3 4