Sharp CD-XP305V Service Manual page 50

CD-XP305V
ICM1 VHi1625635T-1: DRAM (1625635T)
Pin No. Port Name
1 VCC Power supply.
2-5 D0-3 Data input/output.
6 VCC Power supply.
7-10 D4-7 Data input/output.
11*,12* N.C. Not used.
13 WE_ Read/write enable.
14 RAS_ Row address strobe.
15* N.C. Not used.
16-19 A0-3 Address input. (ROW/REFRESH: A0 TO A3) (COLUMN: A0 TO A3)
20 VCC POWER supply.
21 VSS Ground
22-26 A4-8 Address input. (ROW/REFRESH: A4 TO A8) (COLUMN: A4 TO A8)
27 OE_ output enable.
28,29 CAS_,CAS2_ Column address strobe.
30* N.C. Not used.
31-34 D8-11 Data input/output.
35 VSS Ground
36-39 D12-15 Data input/output.
40 VSS Ground
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
RAS_
14
29
CAS2_
28
CAS_
13
WE_
A0 16
17
A1
A2
18
19
A3
A4
22
23
A5
A6 24
A7
25
A8
26
Clock generating
circuit
Coidmn decoder
A0-A8
I/O control circuit
Memory cell array
A0-A8
Figure 50 BLOCK DIAGRAM OF IC
Function
Lowar
Upper
– 50 –
Lower data
Input buffer
Lower data
Output buffer
Upper data
Input buffer
Upper data
Output buffer
1
VCC
20
40
35
VSS
21
2
D0
3
D1
10
D7
31
D8
32
D9
39
D15
27
OE