Casio ZD-3 Service Manual page 47

IC302: TA8227P
12
7
1 6
B.S. 1
12
Vcc1
1
Vcc2
IC302: KM44V1000DT-6
20 16 15 11
1 5 6 10
4
RAS
Control
17
CAS
Clocks
3
W
6
A0
Refresh Timer
7
A1
8
A2
Refresh Control
9
A3
11
A4
12
A5
Refresh Counter
13
A6
14
A7
Row Address Buffer
A8 15
5
A9
Col. Address Buffer
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Out 1 Power GND
3 2
30 kΩ
Bias Circuit
Thermal
Shut Down
Protection
Ch 1
45Ω
5
6
In 1 NF 1
V
CC
10
VBB Generator
Row Decoder
Memory Array
1,048,576 x 4
Cells
Column Decoder
45
OUt 2
4 11
Ch 2
Circuit
9 7
In 2 NF 2
Ripple
V
SS
20
B.S. 2
10
30 kΩ
Pre GND
(F In)
45Ω
8
Data in
Buffer
1 DQ0
2
DQ1
18
DQ2
19
DQ3
Data out
Buffer
16 OE